How to interface with Arduino Mega?

[zhangvicto]

Hi,

I am using the Spider to run a custom 3d-printer. However, I have enclosure heating which requires many more pins than what the board offers (I plan on using 4 thermistors for the enclosure alone). I was hoping to have the separate Arduino Mega connected to the Spider and run very simple Gcode commands from the printer to use functions coded into the other board.

I also have a Raspberry Pi but since the RPI does not come with an ADC it is hard to use the NTC100k thermistors that I am using to measure enclosure temps directly. Perhaps I could connect the Arduino Mega with IC2 to the RPI and the Spider with UART to the RPI and run everything that way?

What is the simplest way to do this? Am I overcomplicating things?

Also, I was wondering what is the best method to have custom code within marlin to add functionality? - There are a lot of mixed answers on the internet.

Thanks so much.

[ejhoness]

I think that with klipper running on Raspberry it will be possible to use subsequent controllers