This is the backside of the board. The carrier PCB is 55x30mm plus the antenna part of the wifi SoC module.
The DC jack is very large. And I also wish it would be on the opposite end of where the LED strip is, not orthogonal to it.
But then I'd need to make this board wider, and I wanted to keep it sleek, with possibility to solder the LED strip directly on it.
I want to keep this affordable as much as possible. A bunch of these modules could do very cool effects together.
After I realized that 6 pins of the ESP-12F are literally unusable, changed the wiring a bit (I was able to keep most of the functionality with minor restrictions) tihs is fully routed and done. But I don't feel particularly good about the layout; I want to make it more compact.
This is an RGBW + WS2812 LED driver with ESP8266 and 3-A DC/DC regulator. There are headers for 3 PIR sensors, so it's possible to detect motion, and also in different sectors (movement direction on corridors).
High voltage power lines are such an amazing piece of engineering.
DIY time-domain reflectometry
I did some very non-scientific TDR with our 200-MHz oscilloscope and lab function generator. The idea is that you get information of the characteristic impedance along the cable when you send a sharp pulse and observe the reflected waveform.
Avoid buying bad quality BNC cables, they aren't worth it.
The EEZ Bench Box 3 is such a beautiful open hardware modular bench power supply! I'm in awe. Their documentation is simply perfect: https://www.envox.hr/eez/eez-bench-box-3/introduction.html (see the sidebar for details on its components)
I need this in my lab.
They run a crowdsupply campaign: https://www.crowdsupply.com/envox/eez-bb3
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