v1.0.5 - Refinement of DAC and Diff Amp support
v1.0.5 --> pinMode(DAC_PORT,xxx) disconnects DAC from port (is connected by analogWrite(DAC_PORT, xx). analogRead() differential ports corrected for +/- values.
v1.0.5 --> pinMode(DAC_PORT,xxx) disconnects DAC from port (is connected by analogWrite(DAC_PORT, xx). analogRead() differential ports corrected for +/- values.