The Ultratronics Pro board arrived. I made a few connectors and a custom pcb for the logic level shifter. On the right side of the board there is room for the USB host.
For the wires I used the following colors
- Black = 0V
- Red = 5V
- Yellow = 3.3V
- Green = RX
- White = TX / Data
- Blue = Clock
The electronic sheet Danny provide was very useful.
I also fitted the Polulu drivers with (different colored) pin headers. I followed the guide to set the current limit. The right driver is set to 2A. The other ones are set to 0.4A.