#elif defined(__AVR_ATmega32U4__) || defined(__AVR_ATmega1280__) || defined(_
_AVR_ATmega2560__) || defined(__AVR_AT90USB1286__)
ADMUX = _BV(REFS0) | _BV(MUX4) | _BV(MUX3) | _BV(MUX2) | _BV(MUX1);
ADCSRB &= ~_BV(MUX5); // Without this the function always returns -1 on t
he ATmega2560 http://openenergymonitor.org/emon/node/2253#comment-11432
#elif defined (__AVR_ATtiny24__) || defined(__AVR_ATtiny44__) || defined(__AV
R_ATtiny84__)
ADMUX = _BV(MUX5) | _BV(MUX0);
#elif defined (__AVR_ATtiny25__) || defined(__AVR_ATtiny45__) || defined(__AV
R_ATtiny85__)
ADMUX = _BV(MUX3) | _BV(MUX2);
#endif
#if defined(__AVR__)
delay(2); // Wait for Vref to settle
ADCSRA |= _BV(ADSC); // Convert
while (bit_is_set(ADCSRA, ADSC));
result = ADCL;
result |= ADCH << 8;
result = 1126400L / result; //1100mV*1024 ADC steps http://openenergymonit
or.org/emon/node/1186
return result;
#elif defined(__arm__)
return (3300); //Arduino Due
#else
return (3300); //Guess that other un-suppo
rted architectures will be running a 3.3V!
#endif
}
FAQ
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