Autometer Library

int sensorPin = A0;
int model = 2245;
double voltageLow = 1.05;
double voltageHigh = 4.88;
bool debugMode = true;
inline double PSIToPascal(double v) { return v*6894; }

void setup() {
  pinMode(sensorPin, INPUT);
}

void loop() {
  Serial.println(autoMeter(model, sensorPin, voltageLow, voltageHigh, debugMode));
}


double autoMeter(int model, int sensorPin, double voltageLow, double voltageHigh, bool debugMode) {
    switch (model) {
        case 2245:
        {
        int maxPSI = 15;
        double adcLow = voltageLow * 1024 * .2;
        double adcHigh = voltageHigh * 1024 * .2;
        int psivADC = maxPSI / (adcHigh - adcLow);
        int sensorReading = analogRead(sensorPin);
        float pressurePSI = sensorReading > adcLow ? (sensorReading - adcLow)
        * psivADC : 0;
        return pressurePSI;
        break;
        }

        case 2246:
        {
        int maxPSI = 100;
        double adcLow = voltageLow * 1024 * .2;
        double adcHigh = voltageHigh * 1024 * .2;
        int psivADC = maxPSI / (adcHigh - adcLow);
        int sensorReading = analogRead(sensorPin);
        float pressurePSI = sensorReading > adcLow ? (sensorReading - adcLow)
        * psivADC : 0;
        return pressurePSI;
        break;
        }

        case 2239:
        {
        int maxPSI = 30;
        double adcLow = voltageLow * 1024 * .2;
        double adcHigh = voltageHigh * 1024 * .2;
        int psivADC = maxPSI / (adcHigh - adcLow);
        int sensorReading = analogRead(sensorPin);
        float pressurePSI = sensorReading > adcLow ? (sensorReading - adcLow)
        * psivADC : 0;
        return pressurePSI;
        break;
        }
    }
}