AnalogOut does not provide a reference or full-range voltage #6368
Description
AnalogOut just takes a 0-65535 arg. The actual voltage is not specified, and is board-dependent.
Maybe AnalogOut should also provide a reference_voltage attribute, like AnalogIn, so board-independent code could be written to produce a specific voltage. I'm not sure if the name should be reference_voltage or maximum_voltage or something like that.