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Category Archives: Learning
How Math Becomes Difficult
This is a really great overview of a pretty big chunk of mathematics: How Math Becomes Difficult
Perfectly Reball Small BGA Chips Every Time
I found this video particularly helpful: Perfectly Reball Small BGA Chips Every Time. It’s funny this dude’s setup is very similar to mine!
Creating helpful, reliable, people-first content
Today I found some documentation from Google: Creating helpful, reliable, people-first content.
Voyager bug fix
This is too cool. A core dump then binary patch to work around memory hardware failure 15 BILLION MILES AWAY: How NASA Fixed a Software Bug 15 BILLION MILES AWAY | Voyager 1
Microcontroller display
Here’s an interesting video about integrating a display with your microcontroller: The BASICS of Adding a Display to Your Arduino, ESP32, STM32, or other MCU Project. The graphics library he recommends is LVGL.
Gromit-MPX
Gromit-MPX is an on-screen annotation tool that works with any Unix desktop environment under X11 as well as Wayland.
Arduino Keyboard library not working on Debian KDE
Man, I just spent quite a bit of time diagnosing this particular issue.
The problem was that my Symbol Keyboard stopped working. This is a USB keyboard I made from an Arduino Leonardo. The touch screen was working okay, but the keypresses weren’t being delivered over USB.
Long story short, the 7-port USB 3.0 hub attached to my workstation needed rebooting! I disconnected the power supply and disconnected the upstream USB cable to remove both sources of power, then when I reconnected everything my stuff started working again, including my symbol keyboard.
Lesson learned: if you’re debugging a USB device failure try plugging the device directly into the host to avoid any potential issues caused by your hub(s).
It was lucky I had a spare 104-key USB keyboard in the cupboard because I needed one while diagnosing this issue (the Windows box I was using only has a tenkeyless 87-key keyboard plugged into it but the Windows alt-key codes require use of the number pad).
The latest incarnation of my symbol keyboard looks like this:
Silicone and Acetone
Check this out: Waterproof material with silicone and acetone.
Unboxing #25: Unboxing the EEVblog BM2257 Multimeter | Learning Electronics In The Lab With Jay Jay
This post is part of my video blog and you can find more information about this video over here.
You can support this channel on Patreon: patreon.com/JohnElliotV
In this video we unbox the Brymen EEVblog BM2257 Digital Multimeter which arrived recently from my mate Dave Jones of EEVblog fame. Thanks Dave!
In the video I mention about the Multimeter Fuse Pack available at the EEVblog Store (but out of stock), but I don’t think that particular fuse pack has the fuses I need for the BM2257. I have asked about what fuses to get on the EEVblog Forum: Appropriate fuses for EEVblog BM2257 Multimeter.
The BM2257 came with Zinc–carbon batteries which I haven’t seen before. You learn something new every day!
There will be a demo video coming out soon to go with this unboxing video, just like I did for my Fluke 17B+ Digital Multimeter:
I am very happy to have my new BM2257. Thanks again Dave. <3
Thanks very much for watching! And please remember to hit like and subscribe! :)
Following is a product I use picked at random from my collection which may appear in my videos. Clicking through on this to find and click on the green affiliate links before purchasing from eBay or AliExpress is a great way to support the channel at no cost to you. Thanks!
Yum Cha BM800 Condenser Microphone |
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