gemini://sunshinegardens.org/

open source electronics lab

bench power supplies

bus pirate (microchip interface)

1-Wire, I2C, SPI, JTAG, asynchronous serial (UART), MIDI, PC keyboard, HD44780 LCDs, and generic 2- and 3-wire libraries for custom protocols

1: https://web.archive.org/web/20191207183955/http://www.ark-ham.net/PDF/hamATXPowerSupply.pdf

2: https://www.crowdsupply.com/envox/eez-bb3

3: https://www.crowdsupply.com/envox/eez-h24005

4: https://www.adafruit.com/product/237

5: https://www.adafruit.com/product/238