#if defined(FLOW_METER)
    //vcc adjustment, since ref 1.1V is not exact
    const float flow_vcc_calibration = 1;
#endif

#if defined(FLOW_METER)

    //emon1.readVcc() returns vcc in mV compared to internal reference 1.1V voltage
    float vcc = emon1.readVcc() * flow_vcc_calibration / 1000.0;

    int f = analogRead(A6);
    float flow_ = f * (vcc / 1023.0);
    int t = analogRead(A7);
    float temp_ = t * (vcc / 1023.0);

    float flow = (flow_ - 0.375) / 0.03125;
    float temp = (temp_ - 0.5) / 0.03;

    Serial.print("FM");
    Serial.print(flow);
    Serial.print(',');
    Serial.print(temp);
    Serial.print(',');

#endif