openexposer
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add traces to nanites i2c or serial bus
I think i²c should be the way to go here. We can use the https://github.com/rambo/TinyWire library for the motor controller.
The arduino Uno uses the pins A4 (SDA), A5 (SCL) for i²c. Right now A5 is used for microstep configuration and A4 is used for the endstop in Y direction. The microstep feature could be solved in hardware with some jumpers, since there is no need to make this configurable in software. The endstop can easily be moved to another pin e.g. A2.