Rtk.gpio and klipper

[mykepredko]

This might sound like a bit off the wall, but why don’t you use something like the EBB42:

https://www.aliexpress.com/item/1005004242943483.html

If you’re looking to run a fan (or two) as well as some LEDs (including neoPixels) it could be the perfect solution. It can be powered by a Raspberry Pi (or other computer running Klipper) through USB and run Klipper firmware so you can control or access devices using it like the controller or other boards in your printer from your printer.cfg or macros. Depending on where you live, it would probably cost the same as the RTK.gpio when you factor in shipping costs.

We had a discussion on a custom Klipper running USB expansion board, that is probably exactly what you want, some time ago here:

Klipper expansion

Hi, since the rasberry pi and other mini PCs are very expensive, the clipper has become popular on thin client devices. One of the downsides that affects me personally the most is the lack of GPIO. I decided to design an additional PCB with STM32F103 to which I could connect an additional display, ADXL345, fans, LEDs, housing temperature sensors, etc. I am in the process of designing a schematic. I would like to ask those more experienced for some advice, will everything work as it should? Did I…

@aycaramba , can you give us a status update?