Returns supply voltage of Arduino board
Based on the code by sweebee
https://github.com/sweebee/Arduino-home-automation/blob/master/libraries/readVcc/readVcc.h
read-vcc
@/read-vcc
Returns supply voltage of Arduino board
Based on the code by sweebee
https://github.com/sweebee/Arduino-home-automation/blob/master/libraries/readVcc/readVcc.h
UPDpulse
VCCnumber
To use the node in your project you should have the vegunes/read-vcc library installed. Use the “File → Add Library” menu item in XOD IDE if you don’t have it yet. See Using libraries for more info.
C++ implementation
struct State {
long lastVcc;
};
long readVcc() {
//delay(3); // Wait for Vref to settle
// 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(3); // Wait for Vref to settle
ADCSRA |= _BV(ADSC); // Start conversion
while (bit_is_set(ADCSRA,ADSC)); // measuring
uint8_t low = ADCL; // must read ADCL first - it then locks ADCH
uint8_t high = ADCH; // unlocks both
long result = (high<<8) | low;
result = 1125300L / result; // Calculate Vcc (in mV); 1125300 = 1.1*1023*1000
return result; // Vcc in millivolts
}
{{ GENERATED_CODE }}
void evaluate(Context ctx) {
//State* state = getState(ctx);
if(isSettingUp()) state->lastVcc = 0.0;
if(isInputDirty<input_UPD>(ctx)){
state->lastVcc = readVcc();
emitValue<output_VCC>(ctx, state->lastVcc);
}else{
return;
}
}