I made this tiny board to use as an interface between an Orange Pi Plus and a little fan. I'm also using as large a heatsink I could find & fit into the available space, which nicely also makes contact with the RAM chips.

The circuit I used is here.

This board can be fabricated for US$1/each (3 board min order) by OSH Park shared project.

The parts listed below I got form DigiKey, except for the RPi header socket, which also came from Amazon (as I neglected to include it in the DigiKey order). The best fit I could find on Amazon is an 18-pin stackable header socket.

• Q1: Infineon IRLML2502GTRPBF
• D1: Panasonic DB3X209K0L
• R1: Vishay Dale CRCW1206100KJNEA
• J2: JST B2B-XH-AM(LF)(SN)

The fancontrol.py script can be started by:

python fancontrol.py start