ADC_MUX_NONE = 0, // Nothing. return 0
ADC_MUX_NOISE, // Nothing. return something random
ADC_MUX_SINGLE, // Normal ADC pin reading
ADC_MUX_NONE = 0, // Nothing. return 0
ADC_MUX_NOISE, // Nothing. return something random
ADC_MUX_SINGLE, // Normal ADC pin reading