For BiBoard V1
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You can solder a 5-pin socket on BiBoard V1 to plug in a Raspberry Pi.
After plug in the Raspberry Pi board , power on the BiBoard via USB data cable or Battery. Then open the serial monitor, and send serial command XS to enable the Serail 2 working mode.
You can also modify the source code (OpenCat.h) and upload the sketch for BiBoard to enable the Serail 2 working mode:
The serial port on Raspberry Pi 5 is ttyAMA0, So you need to modify the source code in ardSerial.py as following:
