Tiny Fan Board by Gi7mo with RP2040 Controller

Excellent way to use excellent fans

Using the three AUX ports, I can run tachs on all my toolhead fans, and using the four fan ports, I can run various other fans (exhaust, convection, etc). This is really the easiest way to use 3-wire fans (tach), and one of the only ways to use 4-wire fans. The RPi is on a module which is readily available (WaveShare RP2040-Zero knockoff), so if it dies, you only need to fix whatever blew it up, and swap a $6 board rather than buy a whole new board, which is awesome. Also, this allows you to update to the RP2350 if you have some need for it. The only drawback is that because the PWM pin on the 4-pin fan ports use the USB ground, you shouldn't run two or three pin fans on them.

Great little MCU

It's a great little board - using it to provide extra cooling for my octopus pro MCU using the Octoglasses mod.