Rigidbot V2 support - has MCP4728 digipot #4159
Merged
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Cherry-picked re-roll of #4156
This is to support the Version 2 of the Rigidbot motherboard. It has the same pin-out but has stepper digipots controlled by an MCP4728 DAC. Added new board type and updated the DAC coding to the current Wire library: Wire.receive() -> Wire.read Wire.send() -> Wire.write()
Major contributor was Jayson Kelly, who made the first cut at the coding.