How to use In1/In2 and Out1/Out2 on the prebuilt PCB V3.2?

[KramRi]

Hi!

I'm using the prebuilt PCB V3.2 and noticed the In1, In2, Out1 and Out2 connectors on the board. I couldn't find any documentation explaining how they are intended to be used.
Are these GPIOs already implemented in the firmware?

My goal is to connect a momentary push button to In1 to toggle the SupraMatic light locally. How does the input work? Can I simply connect a potential-free push button between the two In1 terminals, or does the input require an external voltage? Are pull-up or pull-down resistors already provided on the board?

I'd also like to use Out1 to drive a relay module for switching an external device. Is Out1 intended for this purpose? If so, what is the output type (push-pull or open-drain/open-collector), and what voltage/current can it source or sink?

Thanks for your great work on this project!

[Gifford47]

please use current dev branch v1.0.2. there's also an updated readme

[KramRi]

Thanks for the detailed explanation and for adding the documentation — it really helped!

I just have two more question:

1. Why does In1 have two terminals? I was initially assuming one terminal was +5V and the other was the actual input signal, but I'm not completely sure how the connector is intended to be used. Could you clarify the purpose of the two terminals?

2. What’s the difference between In1 one the right side with big round terminals and In1 on the bottom with a square and a round shaped terminal?