Amazon best sellers
Analyze review tools
- PCPartPicker. Build your PC digitally—and ensure everything is compatible before you buy it—with this oft-recommended website.
- Logical Increments. Figuring out which components you should buy when building or upgrading your desktop PC.
- 5 YouTube Channels to Help You Build Your New Desktop PC 2020
- A Short Guide to Motherboard Parts and Their Functions
cpu thermal paste
Computer motherboards form factor comparison
- Standard ATX > Micro ATX > Mini ITX > Nano ITX > Pico ITX
- Motherboards Explained: What Are ATX, MicroATX, and Mini-ITX?
- No Ethernet port
- Can get very HOT
- No Audio out jack
- Does not use opensource chipsets for wifi/bluetooth.
- F2: boot into BIOS, F10: boot menu. F7 bios update.
- How to find Intel NUC BIOS version and model on Linux
- Ubuntu 16.04 LTS certified for Intel NUC for IoT device development 6/26/2018
- (Mine) 1.5 GHz Intel Pentium J5005 Quad-Core, NUC7PJYH, 1 x 2.5" Drive Bay. Intel website 1 & website 2. Review by nucblog.net. Youtube review.
- Wake up from suspend using wireless USB keyboard or mouse (for any Linux Distro) (not working yet)
ODroid-H2 (Intel Celeron J4105 Gemini Lake processor, 2018) $111
- Intel Celeron J4105 vs. Intel Pentium J5005
UDOO x86 PENTIUM N3710 (ultra), CELERON N3160 (advanced) 2016.
mini pc + external GPU
the smallest GTX1650 gaming PC from ETAProme
MINIX NEO Z83-4U Fanless, Ubuntu 18.04, $180.
Asus mini PC
- F12 one time boot. F2 BIOS
- Update the Dell BIOS in a Linux or Ubuntu environment
- How to Update Firmware on Ubuntu
- Differences between Dell OptiPlex 3040 vs. 5040 vs. 7040
- Differences between Dell OptiPlex 3050 vs. 5050 vs. 7050
- Differences between Dell OptiPlex 3060 vs. 5060 vs. 7060
Single board computer
- Atom: Bay trail, Cherry trail, ...
- Skylake (sixth-generation Core series of processors) and review
- Intel's New Core M CPU: Everything You Need to Know
- Apollo lake replacing Braswell for low-power laptop/netbook/cloudbook.
G, H, K, T, Y, U, Y Processor Suffixes
- Intel® Processor Names and Numbers
- Intel Y-Series vs. U-Series Ultrabook CPUs: What's the difference?
Intel & AMD CPUs
Explaining Intel & AMD CPUs (video)
- Three AMD Ryzen 5000 Mobile chips you should avoid buying. These chips are based upon AMD's older Zen 2 architecture, not the latest Zen 3, and the performance difference is notable.
- List of AMD CPU microarchitectures
- Zen (microarchitecture)
- 前無古人一個插槽用6年，AMD蘇媽：AM5會走的跟AM4一樣久. 今年下半年，AMD將會推出Zen4架構的Ryzen7000系列，5nm製程，支援DDR5、PCIe 5.0，並首次更換插槽為AM5，而到那時候，Zen4的壽命將長達6年！
- Socket AM4. Support for Zen (including Zen+, Zen 2 and Zen 3) based family of CPUs and APUs.
Time to upgrade your monitor. If you’re shopping around for a new monitor, and you have to choose between higher pixel count or a high refresh rate, you should 100% without a doubt go for the higher refresh rate. The difference 120Hz or 144Hz will make in just how smooth and responsive a UI can be is astonishing. I think the sweet spot is 1440p at 144Hz, preferably with FreeSync or Gsync.
HDR/High dynamic range
stats for nerd in Youtube
My own collection of SoC
|Device||Family||Instruction||Clock & Memory|
|Raspberry Pi||ARM11||ARMv6||700MHz, 512MB|
|Beaglebone Black||Cortex A8||ARMv7||1GHz, 512MB|
|UDOO||Cortex A9||ARMv7||1GHz, 1GB|
|Odroid Xu4||A15 & A7||ARMv7||2GHz & 1.4GHz, 2GB|
Comparison of single board computers from Wikipedia
from Adafruit. It includes spec comparison, performance test, power usage, ...
- Arduino motor spin
- Arduino Uno vs Beaglebone vs Raspberry Pi from Makezine.com.
- Arduino Uno vs Raspberry Pi vs Beaglebone black from lifehacker.com.
Low-to-medium range PC/tablet and Chromebox
Intel® Atom™ Z2760, 2G ram, 64GB storage and Micro-HDMI.
Lenovo chromebook S330
Feel fast especially on Terminal.
Dell Inspiron 2-in-1 14" Touch-Screen Chromebook
Bestbuy $399. Full HD, 4GB memory, 128GB eMMC. Stylus. Intel Core i3 CPU.
Intel Celeron 2955U Processor 1.4 GHz, 2GB DDR3 RAM, 16GB ssd, Year 2014
It is not updated for the meltdown & spectre bug. See this list.
To enter the developer mode, use the 'reset' button (a small hole next to Kensington lock). See
- Developer mode chromebox in HP chromebox
To invoke developer/recovery mode, you insert a paper clip and press the RESET BUTTON (just beside the kensington lock) and press the Power button. Release the RESET BUTTON after a second.
To enter Dev-mode you first invoke Recovery, and at the Recovery screen press Ctrl-D (there's no prompt - you have to know to do it). It will ask you to confirm by pressing the reset BUTTON again.
Dev-mode works the same as always: It will show the scary boot screen and you need to press Ctrl-D or wait 30 seconds to continue booting.
It seems the 'Reset' button is called 'Recovery' button on ASUS chromebox. See here.
See Gallium OS.
- Upgrade the RAM.
- M2 SSD (22mm x 42mm). Transcend 256GB SATA III 6Gb/s MTS400 42 mm
- Taken apart Video
ASUS website. 1.7 GHz Intel Core i3-4010U Processor, 4GB of 1600 MHz DDR3 RAM, 16GB Solid State Drive, Year 2014
A newer one is CN62.
Both are not updated for the meltdown & spectre bug. See this list.
ASUS chromebook C423
Intel® Atom™ Z3735G Quad Core (64-bit), 1G ram, 32GB storage. The C: drive shows the space is 23.5 GB. The free space is 20GB. After the first Windows update the storage space is reduced from 18.6 to 16.8. After running Disk cleanup utility, the storage now becomes 17.1 (still lose a lot). So the lesson is not to run Windows update if the disk space is very limited (eg tablet) & everything is working fine now.
Low cost laptop
Best Chromebooks That Run Android Apps
- Macbook Pro 2015- 4lb 6.9oz
- Lenovo Thinkpad T420s - 4lb 1.0oz, removing DVD - 3lb 12.7oz
- Lenovo Thinkpad T440s - 3lb, 7.4oz. Touchpad design makes cursor jumps when clicking.
- Lenovo Thinkpad E480- 3.85lb
- Lenovo Thinkpad X1 carbon (6th gen)- 2.49lbs
- Lenovo Thinkpad 13 Chromebook (usb-c) - 3.2lbs
- Lenovo ThinkPad L390 - 3.2lbs (L-series for business customers)
- Lenovo Flex 14 81SS0005US - 3.52lbs
- The 7 Best OLED Laptops 2021/11
Clean laptop screen
LED, 30 ANSI lumen 854x480, 12V & 1A power. The manual is available at Samsung web site here. The input signal in D-Sub can be 1280x800, 1280x768, 1280x720 resolution although the manual also said "All resolutions higher or lower than 854 x 480 are converted to 854 x 480 by the scaler chip in the projector. To obtain an optimal picture, the resolution from the PC should be similar to the projector (854 x 480)".
Vivitek Qumi Q5
amazon. Fan is noisy! 1080p video downloaded from youtube can't be played (720p is OK). Power consumption is about 114 Watt. No dedicated button for volume control when playing music. No zoom-in option for viewing text. No build-in Android OS. When connected to Jetson nano, the font looks tiny:(
- M2 SSD have two kinds. One is M2 + SATA and the other is M2 + PCIe + NVMe. https://youtu.be/alb6-zp52mA?t=159
- WD BLACK SN750 250GB NVMe Internal Gaming SSD - Gen3 PCIe, M.2 2280, 3D NAND - WDS250G3X0C
NVMe (cf SATA SSD)
- From 'best to worst' it goes MLC (such as Samsung 970 pro, 2x as expensive as similarly sized drives but also 2-3x faster), then TLC, followed by QLC.
- Should You Upgrade to NVMe? 6 Reasons to Stick With SATA SSDs
- On Dell Optiplex 5060 MFF (smaller than SFF, Differences between the Dell OptiPlex 3060, 5060, and 7060) I need to change "SATA Operation" from RAID to AHCI. Otherwise when I installed Ubuntu I will get an error message This computer uses Intel RST (Rapid Storage Technology). You need to turn off RST before installing Ubuntu. For instructions, open this page on a phone or other device: help.ubuntu.com/rst and installation stopped.
- 5 Most Reliable Hard Drives According to Server Companies (11/30/2017)
- Western Digital Red - NAS application
- Toshiba MD04ABA400V
- HGST HUH728080ALE600
- Seagate ST8000DM002
- Western Digital Black - high performance
- A 7200 RPM drive presents minimal performance gains over a 5400 drive. Especially when compared to an SSD.
- Greens are for eco-oriented folks who want less power consumption
- Blues are your standard vanilla drives
- Reds are performance oriented drives that spin at variable rates
- Blacks are for enthusiasts willing to shell out a premium
Signs Your Hard Drive Is Failing
Hard drive comparison
Hard drive docking station
- Sabrent USB 3.0 to SATA Hard Drive Docking Station w/ UASP (EC-DFLT). A firmware upgrade requires a Windows PC.
- https://www.sabrent.com/downloads/ Download from Sabrent. Search for "EC-DFLT".
- https://www.startech.com/Downloads. SATDOCKU3E.
- How Do Solid-State Drives Work?
- How to Choose an SSD: 5 Things You Need to Consider
- 101 Guide To Solid State Drives
2.5 inch SATA SSD and M.2 SSD
- What Is the M.2 Expansion Slot, and How Can I Use It?
- SanDisk 16GB
- MyDigitalSSD 128GB
- SATA 介面的效能約莫為 3 - 5 倍左右，而 PCIe NVMe 的效能表現更高，相較於 HDD 可達 10 - 30 倍的效能表現。 價格進入「甜蜜點」，現在入手 SSD 正是時候！選購 SSD 必備知識，效能 UP UP 的 SSD 升級實戰！
SATA 採用 B + M Key 的設計，而 PCIe 則為 M Key 設計，兩者並無法相容。
SLC, MLC, TLC, QLC
Your Next SSD Might Be Slower (Thanks to QLC Flash). In short, QLC SSDs Break Down Much Quicker. You should definitely avoid QLC drives with 512 GB and less. QLC flash isn’t too much of an issue when you look at the higher capacity drives.
Trim and defrag
UFS, eMMC, SSD
- http://www.howtogeek.com/293339/what-makes-emmc-flash-memory-viable-in-mobile-devices-but-not-pcs/ eMMC vs SSD. eMMC (NVRAM technology) has a write cycle of 3k to 10k but SSD (NAND or NOR technology) has a write cycle of 10k to 30k.
- eMMC to UFS: How NAND Memory for Mobile Products Is Evolving. UFS boasts a substantial improvement in performance over eMMC.
- F3 tool,
- Linux check the physical health of a USB stick
- fsck command
- Run CHKDSK to check and repair SD card bad sectors
Maximize the lifetime
- Some helpful tips on extending the life of your card
- The MicroSD card should be reformatted every 2 weeks to maximize the lifetime of the memory card (from the manual of Vantrue N1 Pro Mini Dash Cam) .
- How often should memory cards be formatted?
- Formatting clears the directory structure of the card and removes any artifacts that might be left behind by erasing. Repeatedly using the ERASE and ERASE ALL camera options and not formatting can result in a buildup of file artifacts that may eventually cause the card to fail.
- How often does a microSD card needs to be formatted?
- While the quick format will simply clear the filesystem table so all the space on SD card will appear as available (the data is still on the card), the full format will also check for errors and remove all the data from the card by writing zeros (for example).
- MEMORY CARD BEST PRACTICES: 15 THINGS YOU SHOULD ALREADY BE DOING
- Formatting is a more complete way of clearing old files from your card and can reduce the risk of data corruption.
- How and Why Should I Reformat My Memory Card?
- Deleting or erasing a file doesn’t necessarily remove it. Instead, your card will simply write over the “deleted” files whenever you save new data. This means the “deleted” files remain on the card until they’ve been replaced. Reformatting is a more thorough security measure that ensures you permanently erase all the data before adding new files or images. It’s the only way to rest assured that a file is truly erased.
- The Fastest and Best microSD Cards 2019-10-22
- https://havecamerawilltravel.com/photographer/fastest-microsd-cards/ (Updated Apr 2018)
- V60: 60MB/s
- V30: 30MB/s
- U3: 30MB/s
- U1: 10MB/s
- class 10: 10MB/s
- class 2,4,6: 2,4,6 MB/s
Best microSD cards
- The Best MicroSD Cards for Dash Cams in 2019
- Which SD Cards Last Longest In Security Cameras?
- The Best MicroSD Cards For Drones, Dash Cams, and Action Cams
- Silicon Power 64GB
Why your laptop's SD card reader might be terrible
USB device speed comparison
See http://www.elinux.org/RPi_SD_cards#Performance for an objective way to get write/read speed by using command line tool 'dd'.
|Patriot XT 32G USB3.0||Example||50MB/s||vfat|
|Patriot XT 32G USB3.0||Example||115MB/s||fat16|
|Patriot XT 32G USB3.0||Example||113MB/s||fat32|
|Patriot XT 32G USB3.0||Example||24MB/s||ntfs|
|Patriot XT 32G USB3.0||Example||139MB/s||ext2|
|Patriot XT 32G USB3.0||Example||50~100MB/s||ext3|
|Patriot XT 32G USB3.0||Example||140MB/s||ext4|
When testing Patriot XT USB 3.0 drive, I partition it into ext2 (15GB)& ext3(15GB). The problem of unstability in Patriot XT's ext3 partition is not related to ext3 partition because if I switch the order of partitions of ext2 and ext3, then ext2 becomes unstable.
- A word about USB flash drive.
- According to the Slo Bytes USB Flash Drives report from Brian K. Lewis, flash drives are capable of handling 10 thousand to 10 million write and erase operations during their lifetime, depending on the source as well as the specific USB drive. Regardless, a flash drive typically will outlast any standard hard drive. The main concerns about the life expectancy of a flash drive are damage from neglect and becoming lost or stolen.
- The life expectancy of a USB Flash Drive can be measured by the number of write or erase cycles. USB flash drives can withstand between 10,000 to 100,000 write/erase cycles, depending on the memory technology used. When the limit is reached, some portion of the memory may not function properly, leading to lost of data and corruption.
- Most experts would agree that around 10 years is about what you can expect to retain data on a flash drive without powering it up. That means you can lock away a USB drive for 10 years and return to still see your data. After 10 years of not being powered on, the electrical charges determining if bit of information is either a ‘1’ or a ‘0’ gets hazy. This is because like all electrically charged devices, they suffer from what is called electro/magnetic deterioration; or simply put, where devices will eventually lose their power.
- The copy-paste speed on my 7200rpm hard disk is about 160MB/s.
- Tested using Seagate portable drive SRD0SP0 500GB with USM((Universal Storage Module)/USB 3.0. When it is connected to USB 2.0/3.0, the writing (from an internal hd onto it) speed is at best 30MB/s. When it is connected to USB 3.0, the writing (from it to an internal hd) speed is at least 60MB/s.
- DIY USB on the go cables.
M2 NVMe to USB enclosure
- https://www.memtest86.com/technical.htm. It has a total 4 passes. Each pass has 13 tests. It could take over an hour to run 13 tests for one pass.
- How many tests needed to run for memtest86?
- If we have multiple memory modules/sticks, we can test them one by one.
Nintendo Devices hack
Cellular phone frequency list
- North America
- Cheat sheet: which 4G LTE bands do AT&T, Verizon, T-Mobile and Sprint use in the USA?
- 1700 (3G UMTS),
- 1900 (3.5G HSPA+),
- 2/4/12 (4G LTE)
Chunghwa telecom uses 2100 for 3G/3.5G.
What is the difference between G, E, 3G, H, H+ and 4G symbols? We find out!. The order is (from fastest to slowest)
Verizon, AT&T, T-Mobile, and Sprint: Which Mobile Carrier Is Best for You?
GSM vs CDMA
Mobile virtual network operator
- Mobile virtual network operator/Prepaid carriers
- The 7 Cheapest Prepaid/postpaid Phone Plans With Unlimited Everything
3 Ways to Find Free Unlocking Codes for Mobile Phones
How to Block Unknown Callers
When to get a new cell phone
Buy a phone
- Buying New vs. Used Smartphones: What’s the Cheaper Option?
- The Best Android Phones Under $300 Oct 2018
- The 6 Best Unlocked Phones Under $200 Oct 2018
- Nextbin Robin frequency bands and network compatibility
trackfone $20 a year
Vehicle camera recorder
1. night vision 2. can turn on/off manually 3. pictures stable (not flicker) 4. G-sensor 5. 3D turning on mount racket 6. no surprising things like auto turned off, (power, start) buttons not working, freeze 7. video space (640x480 takes 100MB for 1 min???). The Amazon website has a list of popular dash cams.
- Wyze Just Increased the Local Storage Capacity for Its Smart Security Cameras 1/12/2022
- How To Get Wyze Web View for Free on Windows 11
Mirrorless & DSLR cameras
- Tom's guide
- For Better Beginner Photography, Buy a Cheaper Body and Nicer Lenses
- Mirrorless vs. DSLR vs. Camcorder: What's the Best Video Recorder?
- Why You Should Never Buy a New DSLR Camera (And Always Buy a Used One)
Nikon D5600 camera
- BEST Video Settings To Record Video On ANY Nikon DSLR (D5200/D5300/D5500 FULL Tutorial)
- Nikon D5600 "User Guide": How To Setup Your New DSLR 36:58 long.
- Keep the lcd screen on the back display of your nikon dslr on for a longer time? Custom setting menu -> Auto off timers. Default 'norm' is 8 seconds and 'long' is 1 minute.
- Nikon D5600 Overview Tutorial 1:24:16 long.
- Got a new Nikon? Some cool camera tips for beginners 5:49 long.
- Lens Bag with Adjustable Drawstring
- How to Use Wi-Fi Transfer on Your Nikon D5500
Can anything be done to reduce the shutter sound on my SLR?
Wide angle lens
Sensor and Pixels
- What Is an F-Stop in Photography?
- The f-stop is the ratio of the focal length of a lens to the lens aperture (the hole through which the light enters). So, an f-stop of 2 (f/2) means the lens aperture is half the focal length. In a lens with a focal length of 100mm, the aperture would be 50mm (100/50 = 2).
- The lower the f-number, the brighter the image.
- What Focal Length Should I Use For My Photos?
- What Aperture Should I Use With My Camera?
- What Is Aperture in Photography? How to Understand Camera Aperture
- How to take portraits with blurred backgrounds
- Stand back a little and zoom-in your lens – this is related to focal length/angle of view/sensor size
- Choose the smallest f-number (bigger aperture) that’s available.
- increase the distance between the subject and the background
- How To Blur The Background With A DSLR
- Open the aperture wider for a more shallow depth of field
- Use a longer focal length (zooming in) to blur the background more
- Get closer to the subject for a macro effect
- How to Take a Photo With a Blurred Background Use a cell phone or small point-and-shoot camera
- Choose portrait mode, and turn off the flash.
- Make sure the subject is far from the background.
- Get close to your subject
- Using the Camera: Taking Photos - moto x4
- You Can Attend Nikon's Photography School For Free This Month 2020-04
- How to Take Great Photos with the Nikon D5600 from tom's guide.
- Lens Speed, Explained: How to Shoot Anywhere With Confidence
- How to Photograph the Moon Choose a lens that is 200mm or higher. Choose a short shutter speed. "Keeping the shutter speed at a minimum of 1/125-second will mean the moon will be less likely to come out blurry."
- What Camera Settings Should I Use for Nightime Photos. Wider aperture. Most night photos are shot with an aperture between f/1.2 and f/2.0.
- Taking Pictures of Fireworks, How to Photograph Fireworks
- Manual mode
- Use a wide or telephoto zoom lens
- Start with a slow shutter speed of 2.5-4 seconds
- Set the camera to a low ISO level (ISO 100) and a narrow aperture field (f/5.6-f/8 or bumping up to f/11-f/16)
- Understanding Metering and Metering Modes
- Exposure Bracketing: The Creative Insurance Policy
- How to Improve Composition in Your Photographs
- How to Get Started with Photography
- 5 Photography Apps and Guides to Find the Best Lens for Your Camera.
- DOF Simulator (Web): Visualize How the Camera and Lens Will Look.
- How to Take Professional Photos of Yourself
- If the image is too dark, try raising the ISO or lowering the shutter speed.
- If the image is washed out in light, lower the ISO to 200-400 before moving the shutter speed down.
- For an outdoor business headshot, set the aperture as low as you can (usually around f/2) to blue the background out.
- Unless you want to draw attention to something in the background, keep the aperture(f-stop) under f/12.
- Turn the ISO to 100-400 for a clear image.
- Picture This: Learn Digital Photography with These Courses
- Nikon Brings Back Its Free Online Photography Courses in Time for the Holidays
- 10 Photography Terms All Photographers Should Know
- Pan shot
- 10 Street Photography Tips That Will Make You a Better Photographer
- What Is Texture in Photography? (And How to Use It)
Wifi SD card
HDMI & CEC
CEC (Consumer Electronics Control) allows for control of devices over the HDMI port.
- How to Enable HDMI-CEC on Your TV, and Why You Should
- How to find out if your device is HDMI CEC capable?
micro HDMI vs mini HDMI
- Mini HDMI/Type C (flat, wider) is used on DSLR cameras standard sized tablets. Raspberry Pi zero. 7.8in Not-eReader.
- Micro HDMI/Type D (small like micro-USB) is used on smaller portable devices such as smartphones and smaller tablets. Raspberry Pi 4. Retro Pocket 2. Beaglebone black.
- Manufacture page, D24f4-J01 Manual, 25 Watt, $6 if 5 hours/day. 25*5*365/1000*0.12=5.5.
- Will 1080p resolution ever be broadcasted over-the-air? Is it technically possible?
- ATSC 3.0: Everything you need to know about broadcast TV’s next big thing
- SiliconDust HDHomeRun PRIME Cable HDTV (3-Tuner). The over the air allow for 720p / 1080i as there max standard and I am not aware of any cable providers broadcasting in 1080p.
- SiliconDust HDHomeRun Flex 4K ATSC 3.0 NextGen TV: 2/4 Tuners HDFX-4K
- How to Use Chromecast: A Guide for Beginners
- How to Use a Chromecast as a Second Computer Monitor
- Bluetooth audio
- Connect Bluetooth devices to Google TV. Troubleshoot connection issues: Unplug your TV for 10 seconds and then plug it back in. When your TV is on, try to pair it again.
- Chromecast with Google TV (CCwGTV) has an annoying Bluetooth audio issue, but there's a simple fix. Settings (via your profile image in the top right of the homescreen) > Apps > YouTube > Clear data.
- Maximize Your Chromecasts Full Capabilities (USB hub)
- How to Safely Dispose of (or Sell) Smarthome Hardware (including How to Factory Reset an Amazon Echo)
- How to Connect Your iPhone to an Amazon Echo Device
- How to Reconnect a First-Generation Amazon Echo to a Wireless Network
- How to Use Your Amazon Echo as a Bluetooth Speaker
- How to Use Amazon Echo as a Bluetooth Speaker for Computer or Mobile
- What Is Amazon’s Alexa and What Can It Do?
- 7 Alexa Skills to Make Your Life Easier on Amazon Echo
- The 25 Best Alexa Skills of All Time (Free and Paid)
Amazon Fire TV
- Navigation with the remote.
- How to Cast YouTube and Other Web Videos to Kodi (Like the Chromecast)
- Kore (Android)
- Yatse (Android)
- Pushbullet (iOS & Android)
Bypass Google’s YouTube block on the Amazon Fire TV
Change settings for privacy
Send to kindle web extraction failed when I tested 'Send to Kindle' from an iPad.
But it works when I use the Chrome extension on the Chrome browser.
To take screenshots, just hold down on on the top left and button right, or the top right and bottom left. The pictures are stored in the root folder of your Kindle Paperwhite. You can plug your e-reader into your PC via the USB cable and get access to any of the pictures you took.
Identify Kindle generation
How to Tell Which Kindle I have? --Identify Kindle Model Updated Dec 2019
https://www.amazonforum.com/help/identify-your-kindle-e-reader. Mine is paperwhite 7th generation released 2015.
Kindle Paperwhite 3 (2015, 7th generation) vs Paperwhite 2. Both have built-in front light. Paperwhite 3 has 300 DPI while paperwhite 2 has 216 DPI.
Power saver mode
The following file types are supported for Send to Kindle: - Microsoft Word (.DOC, .DOCX) - PDF (.PDF) - Text (.TXT) - Images (.JPG, .JPEG, .GIF, .PNG, .BMP) - Kindle Format (.AZW, .MOBI) - Other File Types (.RTF, .PRC, .PSZ)
- Browser (send web content): Chrome and Firefox (Not compatible with Firefox Quantum)
- PC or Mac (send documentations)
- Email (send documentations)
- Android (send documentations)
Question: how to do it in R?
New Push to Kindle Android app from fivefilters.org. We no longer require email addresses to be entered to send articles.
Kinstant - the start page for Kindle's web browser
Removing Kindle User's Guide
https://www.mobileread.com/forums/showthread.php?t=288690. Change the selector at the top left of the library screen from "ALL" to "DOWNLOADED". The "ALL" option shows you all the items in your Cloud library; "DOWNLOADED" shows you just what's currently on the device.
- https://www.azwsoft.com/?c=OBJ-KDR-1 (paid with free trial 30 days)
Amazon Kindle Fire Tablet
- Fire Tablet Tool makes hacking Amazon’s 2017 tablets easier
- Install Google Play & Remove Ads on an Amazon Fire Tablet Without Root
Panasonic Troubleshooting - Error Message "No Link to base" Menu - Initial setting - Registration. Follow the screen to press the 'Locator' on the base for 5 seconds and then press 'OK' on the handset. Done. ✅ See also p35 on the manual for registering a handset.
Best headphones: Our top picks for personal listening. Over-the-ear headphones explained, Wireless headphones explained, Noise-cancelling technologies explained.
What Are Decibels (dB)
- How to Connect Your Bluetooth Headphones to More Than One Device at a Time
- What is Bluetooth multipoint, and why isn’t it more popular?
- Bose 700.
- Button controls
- It can connect to 2 devices at a time (it can memorize up to 8 most recent paired devices). To switch between connected devices, pause the first device and play music from the second.
- In order to disable the voice prompt every time it was connected, download the Bose Music App. I sign up using Apple ID. In the Setting, check Disable Voice Prompts
- Also multiple BT devices can connect to iPad at the same time but only 1 device has the sound.
- Ear cushions are replaceable.
- When it is connected though a cable, the BT will be disabled.
- Aptx is not supported.
- Double taps will pause.
- Bluetooth 5.0 and AAC, SBC codecs. It supports Bluetooth pairing profiles A2DP, HFP, HSP, AVRCP, and BTLE.
- The headphones can be used without an app. But the Bose Music app allows to make changes (such as 10 noise cancelling levels) that are not necessarily possible on the headphones themselves.
- Bose QuietComfort 35 .52 lb
- Bose SoundLink .43 lb
- Sony WH-1000XM2 .61 lb
- Sony - H900N .64 lb. Official website
- Audio-Technica ATH-M50x .63 lb
- TaoTronics Active Noise Cancelling Bluetooth Headphones tt-bh22 .48 lb
- Sennheiser HD 4.40 .49 lb
- Sennheiser PXC 550 .49 lb
- Avantree Audition Pro - aptX LL .43 lb
- 3M Worktunes Wireless Hearing Protection with Bluetooth Technology and AM/FM Radio 1.3 pounds
USB-c Power Delivery
- All You Need to Know About USB Power Delivery Normally, each device charged by USB will have their own separate adapter, but not anymore. One universal USB PD will be able to power a wide variety of different devices.
- What Is USB Power Delivery (USB PD)?
PD usb-c battery
- RAVPower 20100mAh PD 3.0 45W Power Delivery Power Bank for macbook, phone, ...
- Anker PowerCore+ 26800 PD with 30W Power Delivery Charger
Search: Best USB-C Power Banks : Best Power Delivery (PD) Portable Chargers
How long will it power my device
working time = (Wh from the power station)* 0.85/ (watt of your device).
USB Hand Warmers
You Really Can Charge Your Phone With a 9 Volt Battery
From Lifehacker. A car charger is required. Line up your 9 volt battery, with the big (negative) battery terminal on the spring, and the positive (smaller) terminal touching the button in the center of the car charger.
Portable power station
- You can use it as a pass through UPC backup if the power station supports the pass through.
- If we try to provide more than 1 input (eg solar & 120v AC & 12V car charger at the same time), then only 1 input will be taken. There is a maximum charge rate. But it seems it does not hurt if we supply more than 1 input at the same time.
- Golabs R300 has a Solar Panel (62w input max), Wall Outlet (42w input max), Car outlet (42w input max), or Generator (42w input max). Charging ways. GOLABS portable power station is built in an MPPT controller, the voltage is 10.8-23.5V (3A), the maximum input power can reach 60W. Car charger adapter is included (Car cigarette to power station input port). The cigarette socket on the power station is for output (12V/10A); e.g. tire inflator.
- Golabs R150: similar to R300 except the capacity.
- The full charging cycles is about 500-200 before it drops to 80% on subsequent charges.
- Charge it every 3-6 months.
- Many has a built-in MPPT controller (means faster charging with a solar panel).
- Not store it in a below 0C temperature environment.
- Check the Watt requirement of a electronic device if we want to power it with the portable power station.
- GOLABS Portable Power Station, 299Wh LiFePO4. It includes a PD USB-C port. It allows to use AC while it was charged. DC connection is 5.5x2.1mm. 12V DC output is not regulated.
- GOLABS Portable Power Station, 204Wh(=63750mAh * 3.2V), R150 PD 60W USB C. One thing to note when charging via 2.1 mm plug you will not be able to use the USB power delivery port. Because this is a modified sine wave (inverter) some (AC) electronics may produce extra noise. I guess if I just use its USB-C connector (DC not AC), it would be OK (at least the power station's fan is not making any noise).
- Can a Modified Sine Wave Inverter Damage Electronics? Suffice it to say that if it doesn’t use an AC motor, isn’t a delicate piece of medical equipment, and doesn't fit into any of the other no-go scenarios, you’re probably going to be in the clear. .... your laptop is probably going to be fine. If the device you want to power up runs on DC power in the first place, like a laptop, you're actually better off looking for a way to skip the transition from DC to AC and back to DC.
- Jackery Portable Power Station Explorer 240. It allows to use AC while it was charged. DC connection is 8mm.
- ROCKPALS 300W Portable Power Station, 280wh (78000mAh) Solar Generator. Connection 5.5x2.1mm. Con: AC port cannot be used while charging. Only the DC ports (USB, 12V) can.
- Anker Powerhouse 200, 213Wh/57600mAh Portable Rechargeable Generator. 57600mAh * 3.7V/1000 = 213Wh.
Portable battery != Jump starter
- Honda by Jackery HLS 290 Portable Lithium Battery Mobile Power Station. Capacity: 292Wh. Working time = 292Wh* 0.85 / operating power of your device.
- PAXCESS Portable Power Station, 280Watt Solar Electric Generator. Capacity: 250Wh.
- RockPals 300W and review by PCWorld
- Jackery Explorer 240/250: Emergency Power Backup for All The Things
- Jump Starter
- Some calculation. The solar panel is measured by Watt & Volt but the battery is measured by Wh.
- Renogy 100 Watts 12 Volts Monocrystalline Solar Starter Kit
- Eco-worthy 100W Watt Solar Panel Kit 12Volt Battery Charge Controller RV Caravan Boat medium kit $132 from ebay
- Grape Solar 100W Polycrystalline Solar Panel (include watt calculation), converter 100watts 12volts DC to 10watts 120volts AC? and Home depot
- Environment concern
- How to Charge a Battery with a Solar Panel
- BigBlue 3 USB Ports 28W Solar Charger(5V/4.8A Max) It drains battery of devices when in the shade. Should this panel fall into shade while connected to something like a phone, the panel will act as a resistive load, and the phone will actually drain charge from its batteries into the panel. The blocking diode prevents charge from entering the panel from output devices.
- Kingsolar Solar Charger 40W Portable Solar Panel Charger with USB/DC output
- Portable Solar Panels recommended by Akrvbob
- What Type Of Portable Solar Panels Charge A Power Station? Most solar panels are equipped with an MC4 or Anderson connection. MC4/Anderson connections would have to use a DC5221 – DC5525 adapter cable.
- Acopower 100W solar panel kit This Solar Panel Charges Both 12V Batteries & Power Stations
- In a power station, the solar charge controller is built-in, so when you choose a panel to recharge it, it should be a panel without a charge controller.
- An Aimtom MC4 to DC 5.5mm x 2.1mm adapter (6.6ft, 12AWG) is required for The Rockpals 250W portable station (supports 30 vdc input, the input power is 40W. so, the charing time will be around 6 to 7 hours) . Or this one (5ft, 16AWG) includes 3 other adapters (DC 3.5x1.35mm,DC 5.5x2.5mm and DC8mm Adapter).
- What you need to be careful with when choosing a solar generator to pair with the Acopower solar panel is to make sure the built-in charge controller in the power station can handle at least 22.3V input?
- Read the section "Best Solar Generators/Power Stations To Pair With Acopower 100W"
- What I need is a "100w 12v Monocrystalline Solar Panel" and a MC4 to DC 5.5mm x 2.1mm adapter/cable for my portable power station.
- How to Use a Digital Multimeter
- How to Use a Multimeter (for Beginners)
- How to Check Voltage With a Multimeter
USB voltage meter
- How to measure and compare the capacity (watt hours) of a powerbank or https://www.tp-link.com/us/faq-741.html
- Measure: 6320 mAh * 4.94 V / 1000 = 31.22 Watt hours
- Claimed: 10050 mAh * 3.7 V / 1000 = 37.2 Watt hours
- Raspberry Pi zero w + Camera module. After 169 hours, the USB voltage shows 13539 mAh and Kill-a-watt shows 0.18 kWh.
- Raspberry Pi 2B + ethernet + HDMI + keyboard USB dongle + Wifi USB. USB voltage meter shows it draws 0.33A=330 mA; see also the official documentation from the FAQs: What are the power requirements?
- 6000 mAh * 3.7 / 4.94 = 4494 mAh
- After 2 hours, USB voltage meter shows 645 mAh (~2*330 mA). So I guess my 6000mAh power bank can last 14 hours in total.
- Raspberry Pi Power Measurements
- How long would an 11,000mA power bank power a raspberry pi?
- Power Consumption Rate of Pi2 on USB Battery Bank? calculation.
- Battery amp-hour, watt-hour and C rating tutorial (Video). A 2000 mAh or 2Ah battery means it can supply 2A for 1 hour (or 1A for 2 hours or 4A for 0.5 hour, there is a max Amp it can supply and it will be very hot if we push it to the limit) until the battery ran out of battery.
- Capacity (in Ah) / Load (in A) = battery in hour (in h)
- Volts (V) * Amp-hours (Ah) = Watt-hours (Wh), amount of energy. For example, 1.2V * 2Ah = 2.4 Wh, 9.6V * 2Ah = 19.2 Wh.
- Volts, Amps and Watts explained (Video)
- Amps * Volts = Watts (power/energy)
- Amps (current) is like how much water is flowing.
- Volts (voltage) is kinda like water pressure.
- Voltage = Current x Resistance
Kill A Watt P3
Note: click the 3rd button to switch between Watt and VA; similarly for the 4th and 5th button.
Volt --- Amp --- Watt/VA --- Hz/PF --- kWH/Hour
The relation of Volt-Amp-Watt-VA-PF are
1. VA = Volts x Amps 2. Watt = VA x Power factor (OR W = VA x PF)
For example, if the apparent power is 3000 VA and the power factor is 0.8, the real power is 3000x0.8=2400 Watt.
From the Pepco company, my bill is $530.40 (total usage is 4097 KWh) from 11/27/2014 to 12/16/2014.
Delivery Charges: ================= Distribution services: Customer charge: = 7.39 Energy charge, first 800 KWH x 0.0272 = 21.76 Energe Charge, next 3297 Kwh x 0.0272 = 89.71 Franchise tax (delivery) at .00062 per kWH = 2.54 Universal service charge 0.36 MD Environmental surchage .00015 per kWH = 0.61 EmPower MD charge res .0037 per kWh = 15.16 Gross Receipts tax 2.0408% = 2.81 Montgomery city energy tax res .01131 per kWH = 46.34 Administrativ credit res .0002912 per kWH = 1.19- ========================================================== Subtotal = 185.74 Supply charges: =============== Generation services: Energy Charge 4097 kwh x 0.07732 = 316.78 Procumental cost adj res .0005936 per kwh = 2.43- Transmission services: Energy charge 4097 kwh x .007250 = 29.70 gross receipts tax at 2.0408% = 0.61 ========================================================== Subtotal = 344.66 Total = 530.40
So it looks like the charge per kWH is about .0272 + .0037 + .01131 + .07732 + .00725 = 0.12678.
- On my home server (idle most of time) with a cpu of AMD Phenom(tm) II X6 1055T Processor, it consumes 1.75kWh in 24 hours. Instantly Kill-a-watt shows 70+ Watt from the machine which makes sense (24 * 70 ~ 1750). So the yearly cost of leaving the machine on is about 1.75 * 365 * 0.12678 = 81. For HP chromebox (Intel Celeron 2955U Processor 1.4 GHz), the yearly cost is about 0.2 * 365 * 0.12678 = $9.25.
- For Pi-top (+ Raspberry Pi 3), 11 hours is 0.06 kWh. 0.07 amp. 0.59 PF. 9 VA and 5 Watt (120v * 0.07amp * .59PF = 9VA * .59PF). For 24 hours, it consumes ~0.14kWh (vs 1.75 kWh in Phenom).
- Raspberry Pi power consumption comparison
- For raspberry pi zero w + Waveshare 2.7 e-paper running the clock weather application, it used up 6000 mAh @ 3.7A (4494mAH @ 4.94V)portable battery in 28 hours 40 minutes. 4494/28.67 = 156. Cf How much power does Pi Zero W use?.
- For Intel NUC7PJYH, 24 hours is 0.09 kWh (including suspend after 2 hours). The idle power is 4W and using browser to watch Youtube is 9W.
- For intel nuc8i5BEH (i5-8259U CPU @ 2.30GHz), 24 hours is 0.10 kWh. The idle power is 2W and watching youtube takes 7W.
- For Intel i5-8500t (Dell Optiplex 5060 Micro/SFF), 24 hours is 0.18 kWh. The idle power is 7W when the host is running Proxmox 7.1-10 and two VMs (Ubuntu 20.04 & Win10).
- For ASUS chromebox CN60 (i3-4010U) running the latest ChromeOS, 24 hours is 0.06 kWh.
- See http://www.howtogeek.com/234222/why-you-never-need-to-put-your-apple-tv-or-other-modern-devices-to-sleep/ for explanation about Apple TV and Fire TV case. For example, 2.1 watts of power /1000 * 24 * 365 * $0.125 = $2.29 per year. For Roku Premiere+, .07/36*24 * 365 * $0.125 = $2.2 per year.
- UDOO 4W, SainSmart 9" LCD 3W.
- How many watts of power does the latest MacBook Pro use?. My 2018 macbook pro uses 50+ Watt.
How to Calculate Kilowatt Hours
- What is a watt vs a watt-hour?. A watt (W) is a unit of power, while a watt-hour (Wh) is a unit of energy. Watts = Watt-Hours / Hours. The number of watts is a good measure of how much power your panels will produce in a moment of time. Watt-hours provides a measure of how much energy you’ll use in a provided period of time (hour).
- How Much Does It Cost to Recharge a Battery?
- Residential Electricity Rates & Consumption in Maryland
SSD and HDD power comparison
- Does an SSD or HDD Consume More Power for Your Computer?
- 3.5" vs 2.5" HDD Power Consumption
- How much power does SSD use?. When in active use, the SSD consumes an average of 2.7W and when it is idle, it consumes 0.05W. This is better than the HDD that uses 4.1W actively and 3W when it is idle.
How Much Electricity Each Item in Your House Uses
Login: initpass See FAQ
Toner: TN760 - 3000 pages, $75. 3rd party.
Laser Engraving Machine
- NEJE 300mW Mini DIY Laser Engraving Machine Picture Logo CNC Laser Printer and 500mW version.
- mdrawBot and 500mW laser engraver
- Laser cube 2.0 (100mw laser diodes). Laser engraver from makeblock.cc (500mw laser engraver).
Make your own laptop screen for Raspberry Pi
Blue Light Glasses
Best for note taking. See Remarkable.
|300||1872 x 1404||Y||XY|
|Boox Note Air
|227||1872 x 1404||XY||Y|
Note: 'X' means no good. 'Y' means good. 'XY' means mediocre.
- Software download 下载 (not this old one)
- Current Build number is 2.0.10 (2021-Jan). 2.0.11 (2021-June?)
- Firmware upgrade with PhoenixSuit for Allwinner CPU if your Android is not 8.1.0. If your Android is 8.1.0, you can copy the update.zip file to sdCard/Download/upper directory. The local update will be able to scan the file from multiple locations.
- Paperlike monitor - Windows is supported. For other OS, uses VirtualBox.
- Second-Gen Dasung Paperlike E-ink Monitor May 2016
- Paperlike Pro review. 40 refresh frame rate on HDMI.
- Not-eReader: First E-ink Mobile-Phone Monitor. Received 2019-08-30 by DHL (shipped on 2019-08-28).
- Can play youtube through 'Browser'
- Youtube won't run without Google Play services, which are not supported by your device
- No Google Play app
- APKPure is included for users to install apps. Possibly download APK from Good e-Reader.
- I install
- VLC to play media files,
- Firefox can install add-ons like uBlock Origin to handle ads like AdChoices,
- AirDroid to transfer files
- Taiwan Radio to listen to Chinese radio stations
- Digital Clock
- File Explorder (copy APK from Android phone)
- Gboard, Google Handwriting to input Traditional Chinese,
JuiceSSH for SSH (color theme for e-ink device, volume buttons to adjust font size).For some reason, I switch to use Termius
- Doodling Around for drawing, RAM Booster,
Speed BOOSTER - Memory Cleaner & CPU Task Manager (Permit drawing over other apps). Xodo Docs for PDF
- BBC News
- MX Player Pro
- WiFi No Doze
- DnsChanger, Nebulo
Vivaldi does not block AdChoices and the mobile version does not support extension (vivaldi://extensions will show 'This site can't be reached'). So I remove it.
- "Files Go" is the default file manager. Another one is "Downloads".
- User Manual icon leads to Dasung website for the manual.
- Default reader is called "Dasung eReader". Uninstall it.
- The "screensaver" is a Chinese Lunar Calendar which is cool for Chinese. It will update itself the next day (so it is not sleeping).
- Android 6.0.1. Firmware version v2.1. Kernel version 3.10.65 [email protected] Build number 1.0.17. 2GB memory, 64GB storage. Quadtex-A53. Battery 5600mAh. Display 1872x1404 (4:3) 7.8 inch (cf 1920x1080 is 16:9).
- My settings:
- Image III, Fast ++ speed
- Display: Font size - normal (Large, Huge, Biggest)
- Accessibility: Large text: on
- Brave browser -> Accessibility: Text scaling 120%
- Firefox -> Settings -> Accessibility. Use system font size: on. Always enable zoom: on.
- Display sleep after 30 minutes of inactivity
- Font size: Normal
- Dasung Not e-Reader Review on mobileread
- https://youtu.be/nTk5bwBxt9Q A video from youtube Oct 2019
Kindle DX as an external monitor
Traveler: Ultimate Distraction-Free Writing Tool
Onyx Boox Mira 13.3 monitor
Onyx Boox Note
- Firmware updates
- Change android OS font type? Try long pressing the app's icon and choosing App Optimization, then unchecking Whiten Apps Background.
- How to Transfer files from PC to your BOOX
- The Complete Guide of Transferring Files to BOOX
- How to transfer your files between your Boox and other devices?
- PDF Calendar
- Pushbullet (send files & links)
- Spacedesk (2nd display)
Anyone use their Boox Note Air 2 as a secondary display? I keep it open with spacedesk next to my monitor so I can drag and drop things onto it to read rather than read it on my backlit monitor.
- Onyx Note Pro PDF Review The eBook Reader 2019,
- Onyx Boox Note 2 - In-Depth Review and Guide, Onyx Boox Max Lumi, In Depth Review and Guide: Reader Functionality, Part 3 of 5
- Crop pdf: floating toolbar, table of contents icon (4th from the LHS) -> Navigation -> More.
- Manual of Note Air. Search "Navigation".
Notes from the Manual.
- Cloud Sync ( in bulk), More Options, Notes Sync Setting, Backup and Recover, Settings, Note Password Settings
- Scribble Interface,
- Layers, Template, Custom Toolbar, Write and Erase, Lasso, Text input, AI Recognition, Insert image, Full screen. Floating Toolbar Settings
- It seems FAT32 format works for OTG flash drive, but not exFAT or EXT4.
- How do you hard reset the Note Air? Power off the device, do not connect a USB or power cable Hold down the power button, continue to hold it Wait until the small blue power LED inside the button turns on, and continue to hold for about 7 seconds Release the power button, and press it exactly 5 times.
- Enabling Google Play store works.
- 15 Tips and Tricks for Onyx Boox Android eReaders. Power option: Go to Settings > Power > Power off Timeout -> Never.
- Why the Notes app does not have a highlighter pen?
- Onyx Boox Note Air Review with 10.3" E Ink Screen
- File transfer
- Transfer Books app. All files will be in a folder 'Internal shared storage' -> WifiTransfer (not 'Download')
- Autosync and run it through OneDrive/dropbox/google drive. It synced two direcories.
- Font issue
- Refresh mode (Pinch to Zoom in normal, speed, A2, and X modes on Onyx Boox Note Air )
- When I pinch to zoom in, suppose I zoom in to the left side, then clicking on the right area won't allow me to navigate the right side of the PDF file; it stays on the left side only. See this video. So probably it's still better to use the "Article mode" for reading technical papers.
- http://www.boox.com/boox-note-plus/, Download
- https://www.amazon.com/BOOX-Upgraded-Note-eReader-Android/dp/B07GZM5M98 $569
- https://goodereader.com/blog/electronic-readers/onyx-boox-note-plus-10-3-inch-e-reader-review, $529
- 13.3″ Onyx Boox Max2 vs 10.3″ Boox Note Comparison Review
New firmware updates
Hardware spec (page 97 of the manual): 13.3 inch & 2200 x 1650 pixel, CPU is 1GZ, Ram is 1GB LPDDR2, Android 4.0.4, 16GB storage, 1.21 lbs (ipad 9.7in 2017 is 1.03 lbs). Very comfortable when I use it to read technical papers. It does not have front light, unfortunately. Shipping took about 2.5 weeks.
The manual is written in simplified Chinese only:) It is lightweight. Writing on the ereader is OK. Got it from banggood.com.
- MAX Discussion
- F-Droid as an replacement to Google Play Store
- Discussion from mobileread.com
- E Ink Carta and Carta HD displays support Regal waveform technology, which reduces the need for page refreshes
Onyx Boox Max Carta vs Onyx Boox MAX2
Max2 has a micro HDMI port.
Boox as a Second Monitor
- https://youtu.be/KUO-nt6WlvA (mention quality mode and responsive mode)
- https://youtu.be/lWAsfZTUrJs (include an instruction by using tightVNC on Mac/Windows/Linux platforms)
- https://youtu.be/aZCjYU9msuA Boox i86 - VNC session on EPD display
- Discussion from mobileread.com
- https://github.com/nahtethan/dxg-display/blob/master/BOOXen.md USB solution
- The monitor function on the Max lumi is a gimmick at best. Using as an external monitor: Max Lumi vs Note Air 2 Plus?
Boox and SSH terminal
I found using Max Carta to do work on a terminal is OK.
First go to the Play Store to download an SSH client. I am using JuiceSSH.
We can adjust font size and the theme (white as the background). Even you have connected to a host, you can still use the volume +/- to increate/decrease font size on-the-fly.
You cannot rotate the screen however.
I am using a bluetooth keyboard. If I don't use the keyboard for a couple of minutes, it'll take a few seconds for the device to respond to my typing.
When I use nano, the color syntax highlight is not good. So I use nano -Ynone FILENAME to disable the syntax highlight.
Airdroid works for transferring files between Boox and computers in the same network.
Boox and remote desktop
Note the the device has locked to rotate the screen (i.e. the screen rotation app from Play Store does not work)
When testing to connect to a Windows Desktop
- Microsoft remote desktop does rotate the screen but it does not respond to my clicking
- bVNC does not rotate the screen
Open html files
If I made a copy of a website (efficient R programming for example), then use Boox's default browser to open the html file, some links do not work.
Open epub files
- FBReader: no TOC
- NEO Reader v2.0: *TOC works*
- Onyx Neo Reader: format is OK, but not TOC
- OReader: no TOC
Open pdf files
- Neo Reader v2.0: TOC & search work! We can use the 'Crop Page' function to remove blank space on sides.
- Onyx Neo Reader: no TOC
PDF format has an advantage over epub: mathematical notation is guaranteed.
Notes we created cannot be seen from Storage > sdcard > note directly. In order for the notes to be seen there (so we can copy them to computers through AirDroid), we need to click on each note and choose the gear icon and pick "Export the current page" or "Export all pages".
The default music player works fine. I also like VLC downloaded from Play Store.
Date Automatic date & time: uncheck
- Sleep: 30 seconds
- Power off timeout: 60 minutes
- Network Inactivity Timeout: 15 minutes
microSD card To eject it, go to Settings > Storage > Unmount SD card.
Reset the firmware Settings > Privacy > Factory data reset.
- Open the last read document: uncheck
- Homepage preference: Show new added books
- Show books' titles instead of their names in library: uncheck
Language Hacker's Keyboard
- USB debuggin
- Manage apps
DRM Setting Adobe ID
- Battery level
- IP address
- Model number: MaxCarta
- Build number: 2017-04-28_18-25_1.8.2_e4efe5. There is a button to "Check update from local storage".
Android version 4.0.4
- Device Info-HW
- Hacker's Keyboard
- JuiceSSH. For some reason, I cannot connect to my bluetooth keyboard. So the app is not useful.
- VLC. It provides a loop function. However like the default 'Music' player, when I play a music, it will have a hiccup every few seconds.
Conclusion: it is best to use the device for viewing documents only.
Not compatible with Boox Max Carta Android 4.0.4. According to this, Android 4.1 is required. This source said the app is best supported with an android device of version 4.4. Android 4.4 seems to be required for other Android apps to work according to Good e-Reader.
Regular Amazon Kindle app. Not responding.
I have a Kobo Aura HD. The touch screen is controlled by infrared (like the Nook Simple Touch, no requiring electrical conductivity), not capacitive or resistive technologies. Even a paper or an eraser works on the touch screen. Its screen is 6.8 inch, 1440 x 1080-pixel display with 265 dpi. The brightness is 326 lux. The built-in front light comes the light technology from the ComfortLight. It directs light at the page and boasts an even distribution across the display. The microSD slot can add up to 32GB to the built-in 4GB of storage. The exact model is not on sale now because it is replaced by H2O.
Kobo Wifi Weather Forecast
The pdf program is not quite useful for scientific papers.
- Go to here and download <KBStartMenu_07inclUp4.zip>. Extract the folder kbmenupngs (it contains png files) and put it to the root folder of Kobo. Also put KoboRoot.tgz to .kobo hidden directory (putting it onto .adds won't work). Reject and reboot.
- Download <koreader-kobo-arm-linux-gnueabihf-v2014.04> from v2014.04-stable github page. Put koreader folder in the .kobo hidden directory. Ignore the png file and KoboRoot.tgz file there. Reject and reboot.
If something goes wrong, we can go to Settings -> Device information -> Factory reset to reset the system. It can also download the update after the wifi configuration is set up.
When you update koreader, it should be sufficient to extract the koreader folder, without KoboRoot.tgz - that one is needed to add the launcher.
Standby does not work out of box. See http://www.mobileread.com/forums/showthread.php?t=216960&page=85. That is, run
nano -c /media/brb/KOBOeReader/.kobo/koreader/frontend/ui/uimanager.lua
and change the Standby value from 1 to 4 and suspend function call from 0.5 to 2. The standby problem is resolved.
Battery always 100% (too good to be true, I have not used the ereader for a while). http://www.mobileread.com/forums/showthread.php?t=220912. It`ll take care of itself after a few charge cycles.
.kobo folder after reset
After I run factory reset on the device (and plug in it to my computer), I see the device only has 3 hidden directories
[email protected]:~$ ls -la /media/brb/KOBOeReader/ total 20 drwx------ 5 brb brb 4096 Dec 31 1969 . drwxr-x---+ 4 brb root 4096 Oct 11 10:22 .. drwx------ 2 brb brb 4096 Oct 11 2015 .adobe-digital-editions drwx------ 7 brb brb 4096 Oct 11 2015 .kobo drwx------ 8 brb brb 4096 Oct 11 2015 .kobo-images [email protected]:~$ ls -la /media/brb/KOBOeReader/.kobo total 152 drwx------ 7 brb brb 4096 Oct 11 2015 . drwx------ 5 brb brb 4096 Dec 31 1969 .. -rw-r--r-- 1 brb brb 25 Oct 11 2015 affiliate.conf drwx------ 2 brb brb 4096 Oct 11 2015 certificates -rw-r--r-- 1 brb brb 76 Oct 11 2015 device.salt.conf drwx------ 2 brb brb 4096 Oct 11 2015 dict drwx------ 2 brb brb 4096 Oct 11 2015 kepub drwx------ 2 brb brb 4096 Oct 11 2015 Kobo -rw-r--r-- 1 brb brb 110592 Oct 11 2015 KoboReader.sqlite drwx------ 6 brb brb 4096 Feb 28 2013 slideshow -rw-r--r-- 1 brb brb 3298 Oct 11 2015 Trolltech.conf -rw-r--r-- 1 brb brb 84 Oct 11 2015 version [email protected]:~$ ls -la /media/brb/KOBOeReader/.kobo-images/ total 32 drwx------ 8 brb brb 4096 Oct 11 2015 . drwx------ 5 brb brb 4096 Dec 31 1969 .. drwx------ 3 brb brb 4096 Oct 11 2015 132 drwx------ 3 brb brb 4096 Oct 11 2015 18 drwx------ 3 brb brb 4096 Oct 11 2015 213 drwx------ 3 brb brb 4096 Oct 11 2015 233 drwx------ 3 brb brb 4096 Oct 11 2015 66 drwx------ 3 brb brb 4096 Oct 11 2015 70
KOReader supports any Stardict format dictionaries. To use that, we need to download and put the dictionary 'folder' in the right place (.kobo/koreader/data/dict) of the Kobo ereader.
I tried two dictionaries (Longman Dictionary of Contemporary English and cdict-big5 dictionary) from http://abloz.com/huzheng/stardict-dic/. And they work fine.
Turn your Kobo into a Debian Linux tablet
Multiple ethernet ports
Power over Ethernet (PoE)
- What Is Power Over Ethernet (PoE) and What Are Its Benefits?
- What Is Power over Ethernet (PoE)?
- TP-LINK TL-POE10R Gigabit PoE Injector or Splitter
- TP-Link TL-SG1005P V2 or later | 5 Port Gigabit PoE Switch | 4 PoE+ Ports @65W
- p56 of https://www.raspberrypi.org/magpi-issues/MagPi45.pdf
Some devices powered by PoE include VoIP phone, IP camera, wireless access point. router.
Type-C Multi-Port Adapter
Trendent USB to ethernet adapter
ASIX AX88772A. The windows driver can be found on axix.com.tw. The one from Trendent website does not work.
USB OTG (On-The-Go) adapter
- USB On-The-Go It allows USB devices, such as tablets or smartphones, to act as a host, allowing other USB devices, such as USB flash drives, digital cameras, mice or keyboards, to be attached to them.
- What Is USB OTG? 10 Cool Ways to Use It on Android
DisplayPort Over USB-C
Magnetic Braided USB Charging Cable
Adding USB 3.0 ports to an old PC
How to Crimp Your Own Custom Ethernet Cables of Any Length
How to park your car on a hill
When parking your car on a hill, put the car in neutral, set the emergency brake, then put the car in park (or in gear). This puts the weight of the car on the emergency brake rather than the transmission and can extend the life of your transmission.
- Roku Premiere+ (2016 model, model # 4630R, 5th generation) 4K video, HDR support, AC dual band, ethernet & microSD port and a wifi direct remote w/ a headphone jack.
- Re-pair the remote: Press the small button beneath the battery. Hold it for 3 seconds while positioning the remote next to the Roku.
- 20 Roku Hacks To Make Your Life Easier Oct 2018
- NewsOn app to watch local TV. I can watch WUSA9 (CBS) and a few. But they are not 'live' though it's the same day news.
- Roku iOS/Android app allows to use our bluetooth headphone for listening; see private listening.
Optical Network Terminal (ONT)
Do I Need a Firewall if I Have a Router?. If you already have a router, leaving the Windows firewall enabled provides you with security benefits with no real performance cost. Therefore, it’s a good idea to run both.
Difference Between Routers, Hubs, and Switches
- Prioritize by Service
- Prioritize by Interface
- Prioritize by Device with IP Addresses
- Prioritize by Device with MAC Addresses
Wifi and health
Wifi and Microwaves
Wi-Fi Extender, Mesh Network, Booster, Repeater
- Wi-Fi Extender vs. Mesh Network: What’s the Difference?
- Wi-Fi Extender vs. Booster vs. Repeater: What’s the Difference?
- Wi-Fi Extender vs. Mesh Router: Which Gives You the Best Network Coverage? The extender has its own broadcast name, but it simply relays traffic back to your main router.
Google wifi OnHub, Nest Wifi
Logitech Unifying Software
ChromeOS version works fine.
- Is Bluetooth Safe or Is Bluetooth Radiation Dangerous?
- Tablet Radiation Levels of Popular Models
- Android 手機輻射量十大排行榜單出爐！MOTO、Google 皆上榜. 美國聯邦通訊委員會 FCC 法規，手機的 SAR 安全標準值 limit 為 1.6W/kg。台灣 NCC、歐盟和德國政府則是規定，手機的 SAR 值最大不能超過 2W/kg。
- router radiation safe distance: 15 to 20 feet. What is the Safe Distance from wifi router radiation
- EMF Meter detector
An easy way to take off the cape of the rectangle box is to use a pairs of long nose pliers instead of a knife. The method works on my Logitech M210 mouse. The trick is to shorten the click distance.
Best bluetooth mouse
- Silent mouse. Other silent mouses include M330, M350, M585.
- Channel 1 is USB, Channel 2 is Bluetooth
- Once you switch to Channel 2, hold the button for 5 seconds and it will enter a pairing mode.
- This method works on Ubuntu and Lubuntu 18.04.
Laggy bluetooth mouse logitech M585/M590. Note that the original file contains "ConnectionParameters" section already. The original Latency is 44 and MaxInterval=9. I am using Ubuntu 20.04 (Pop_OS).
Mouse Acceleration vs Sensitivity
Sensitivity/Speed is how far you have to move the mouse to move the pointer a particular distance. A high speed means that very small movements will shoot the cursor a large distance.
Acceleration is a very clever optimization. Normally, to keep precision control over the cursor (for those who need it) you need to keep the speed pretty low. But this means that if you need to get to the other side of the screen, you need to slide the mouse annoyingly far. Acceleration lets you have the best of both worlds.
What acceleration does is boost the speed temporarily when you 'flick' the mouse. So if you need to get to the other side of the screen, you can flick the mouse quickly just a short distance and the cursor will move much further. You then switch to moving more slowly to get the cursor exactly where you want it.
On Linux Mint, I can change these two settings individually. I use medium for the sensitivity and 3/4 high for acceleration.
- One complain is it goes to sleep quickly (5 minutes). So macOS will show keyboard is disconnected frequently.
- Press FN + Z to put into pairing mode
- Lots of tips including how to reset the keyboard
Logitech wireless solar keyboard k750
- Best typing feeling (similar to a laptop computer).
- Solar App and download links for Windows & Mac.
One problem is there is no Num Lock and Caps indicator on the keyboard unless you have install Logitech SetPoint software (Windows & ChromeOS).
- A review on 2016.
- Manual from logitech.com.
- To enter a pairing mode: press and hold one of the easy-switch keys for 3 seconds.
- To switch devices: press one of the easy-switch keys quickly.
- The keyboard has a true 'del' key (in add'l to the back key). On regular mac keyboard, you have to use fn+delete to perform the regular delete action.
- The fn and ctrl keys position are reversed on K780 compared to the regular mac keyboard.
- fn and del = print screen
- cmd and left/right arrow = HOME/END
Logitech K380 Multi-Device Bluetooth Keyboard
Lenovo ThinkPad Compact USB Keyboard with TrackPoint
- https://www.amazon.com/Lenovo-ThinkPad-Compact-Keyboard-TrackPoint/dp/B00F3U4TQS USB model
- https://www.amazon.com/ThinkPad-Compact-Bluetooth-Keyboard-TrackPoint/dp/B00C32FWJC/ bluetooth
- ThinkPad TrackPoint Keyboard II
Lenovo Thinkpad Keyboard 2
Keyboard with touchpad
Microsoft all in one keyboard
- Logitech C525
- Logitech C920 H.264 video compression.
A bluetooth based gadget to control a windows/android/ios device. See http://qblinks.com/support
How to Replace an Outlet That’s Controlled by a Light Switch
How to Ship Packages Without Leaving Your House
- Fly zone map from AirMap
- Use a Drone Simulator to Practice Before You Buy
- How to Get an FAA Drone License As Fast As Possible
- 5 Important Checks to Make Before Flying a Drone
- Google’s OpenSky App Flies to the U.S. to Help Pilot Drones Legally
Dell PowerEdge R630 server
- http://www.dell.com/en-us/work/shop/productdetails/poweredge-r630/pe_r630_1337 and the manual
- integrated Dell Remote Access Controller (iDRAC)
- iDrac 8 manuals/videos
- Different packages of iDRAC (Express is included)
- How to install and configure iDRAC Service Module? This is to deal with the error when I try to use virtual media (iso file) to install a new OS. RAC0690: The iDRAC Service Module is not installed on the operating system of the server.
- RAID configuration
- /boot, recommended size at least 1 GiB. Unlike other mount points, using an LVM volume for /boot is not possible - /boot must be located on a separate disk partition.
- swap. If <=2 GB ram, give 2*RAM for swap. If 2<RAM<=8, gives 1*RAM for swap. If RAM >=8, gives 4G to 0.5*RAM for swap.
- Dell Lifecycle Controller
- OS installation
- How to install the operating system on a Dell PowerEdge Server ? (OS deployment).
- Method 1: Using LifeCycle Controller for Supported OS. Note that the boot mode BIOS/UEFI has to be configured properly in the "System Services" settings (F2).
- Method 2: Booting directly on the OS Media.
- OS Deployment Manual Installation
- Remote OS Installation
- How to install the operating system on a Dell PowerEdge Server ? (OS deployment).
iPad 9.7 2017 (5th)
- https://www.apple.com/ipad-9.7/specs/. A9 chip, 1.84 GHz. 2GB ram.
Rocketbook Erasable, Reusable Wirebound Notebook - Letter Size
- Should I Remove My Laptop Battery To Increase its Life? It really depends on the voltage cutoff of the device in question.
- The Formula for Estimating Laptop Battery Life. Just divide your computer battery’s watt-hours by your estimated wattage. The result is the number of hours you can expect your battery to last. Your expected wattage varies depending on the task you’re performing. Gaming will use between 40 and 60 watts, watching video will consume 15 to 30 watts, and web browsing will eat 10 to 15 watts.
- Google: At what voltage are alkalines considered dead? It really depends on the voltage cutoff of the device in question.
- 9V battery Low Voltage?
- ExpertPower 12V 7 Amp EXP1270 Rechargeable Lead Acid Battery. I use it to replace the battery in the Verizon fios box.
- The beep sounds comes every 15 minutes.
- 12V 14.4V 1A Portable Lead Acid Battery Smart Charger
- It seems it is not necessary to buy a charging unit in order to charge the battery. If low battery light is on, it probably means it is time to replace the battery (cannot hold the power).
- How many hours would battery last: A 6 watt load on 12v battery corresponds to a 0.5 amp discharge rate. Since the battery is rated at 7AH(7 amp-hours), 7AH/0.5A = 14 HOURS period. However, the battery voltage will decrease during the discharge cycle.
- 12 volts * 7 amps will power 84 watts.
- Verizon Battery Backup Unit (BBU) Information
- Sealed lead acid batteries can only be charged and discharged 300 times at the most.
- Verizon Optical Network Terminal (ONT)
- Casio Men's MRW-S300H-1BVCF: Rechargeable battery life is about 10 years
- Casio Women's LA20WH-1ACF : CR1616 3V, 5 years
Used in PC, car remote, ...
Govee Wi-Fi Temperature and Humidity Monitor
Google voice & Obihai
Outgoing calls stopped working on GV TCP connection to 188.8.131.52 failed. Dec 2017.
Burr coffee grinder
- JavaPresse Manual Coffee Grinder,