Overview In a previous post, I had shared some pics of the dev board I had been working on. It contained a variety of features that I felt would be useful on a dev board. However, due to a mistake on my part, there were shorts in the design due to my misunderstanding of how…
Category: TQFP
STM32 Dev Board With CH340G USB
Overview Development board employing an STM32 MCU with a CH340G USB interface IC. LED(s) associated with GPIO pins. Inertial Motion Unit, TCA6424 I2C GPIO Expander. Errata So the boards arrived and they look GREAT! However, upon plugging them into the USB, some Bad Things(tm) happened: The USB ports overheated. The laptop it was plugged into…
ESP8266 Wemos D1 Mini GPIO Expander
Overview So a few years ago, I had purchased a good number of Wemos D1 Mini modules. However, I never got around to actually doing anything with them other than giving them away every now and then. Design Considerations The number of GPIO on the board is woefully low, if you wanted to control a…
ESP32 Quad Optically Isolated n-mosFET Switch Board
Overview So I love chatting up circuit designs with folks. And this board is actually one of those designs that was chatted about and the goal was to see how much I could fit onto a 50x50mm board. Design Considerations Well, went through several revisions. And after I got these boards in, I think I…