measure-voc-index
wayland/sgp40-air-quality-sensor/measure-voc-index
Measure volatile organic compound index.
measure-voc-index
@/measure-voc-index
Measure volatile organic compound index.
DEV@/sgp40-device
An SGP40 device.
TempCnumber
Temperature (Celsius). Used in temperature compensation. Connect to a temperature sensor or specify a value a temperature sensor is not available.
RHnumber
Relative humidity (%). Used in humidity compensation. Connect to a relative humidity sensor or specify a value if a sensor is not available.
UPDpulse
Update.
Donepulse
Pulse on measurement.
VOCnumber
The volatile organic compound (VOC) index.
C++ implementation
#pragma XOD evaluate_on_pin disable
#pragma XOD evaluate_on_pin enable input_UPD
node {
void evaluate(Context ctx) {
// The node responds only if there is an input pulse
if (!isInputDirty<input_UPD>(ctx))
return;
auto sensor = getValue<input_DEV>(ctx);
float tempC = getValue<input_TempC>(ctx);
float rh = getValue<input_RH>(ctx);
auto voc = sensor->measureVocIndex(tempC, rh);
emitValue<output_VOC>(ctx, voc);
emitValue<output_Done>(ctx, 1);
}
}