This pcb is used to connect button, relay and rgb led modules to raspberry running 2 instances of octoprint.

Each octoprint instance has its own dedicate button, relay and rgb led module.

I use the following octoprint plugins and arduino modules:

• GPIO RGB Controller - ky-016 rgb led
• Physical Button - ky-004 button
• PSU Control - ky-019 realy

The rgb led is used to indicate the state of the printer (e.g. green printing, red error/print cancelled).

The button is used for emergency stop.

The relay is used to power on/off the printer.

Thanks to the plugins it can be configured differently (e.g. rgb more colors for more states, button for other macros).

I've connected the raspberry pi, the pcb and the modules like the image bellow (it can be configured differently according to the GPIO pins available).

I can be used with only one instance of octoprint or other modules according to the pins available.