Battery.h

#pragma once

class Battery
{
public:
  static double MeasureBatteryCapacity()
  {
    /*
      // Read 1.1V reference against AVcc
      // set the reference to Vcc and the measurement to the internal 1.1V reference
      #if defined(__AVR_ATmega32U4__) || defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__)
        ADMUX = _BV(REFS0) | _BV(MUX4) | _BV(MUX3) | _BV(MUX2) | _BV(MUX1);
      #elif defined (__AVR_ATtiny24__) || defined(__AVR_ATtiny44__) || defined(__AVR_ATtiny84__)
        ADMUX = _BV(MUX5) | _BV(MUX0);
      #elif defined (__AVR_ATtiny25__) || defined(__AVR_ATtiny45__) || defined(__AVR_ATtiny85__)
        ADMUX = _BV(MUX3) | _BV(MUX2);
      #else
        ADMUX = _BV(REFS0) | _BV(MUX3) | _BV(MUX2) | _BV(MUX1);
      #endif

      delay(2);
      bitSet(ADCSRA, ADSC);
      while (bit_is_set(ADCSRA, ADSC))
      {
        continue;
      }
      
      auto Result = ADC;
      return ((1.1f * 1023.f) / Result);
      */

      return 3.3;
  }
};