GrovePi | open source platform for connecting Grove Sensors

@GroveAnalogPin
public class GrovePHSensor extends GroveAnalogInputDevice {
     private static final Logger l = 
     LogManager.getLogger(GrovePHSensor.class.getName());
     /*** pH values range */
     public static final double PH_RANGE = 14.0;
    /*** 
      number of possible samples with 10 bit analog to digital converter 
     */
    public static final int A2D_RANGE = 1023;

public GrovePHSensor(GrovePi grovePi, int pin) throws IOException {
    super(grovePi.getAnalogIn(pin, 4));
}

@Override
public Double get(byte[] data) {
    // the extraction of the value is taken from the sample of the 
    // RotarySensor3Led 
    // https://github.com/DexterInd/GrovePi/blob/master/Software/Java8/GrovePi-spec/src/main/java/org/iot/raspberry/grovepi/devices/GroveRotarySensor.java
    // this is how its is done there

    int[] v = GroveUtil.unsign(data);
    double sensorValue = (v[1] * 256) + v[2];

    // the Analog to Digital is 10 bit -> 1023 intervals that cover the range of pH of 0 to 14
    // hence the pH value is the sensor value that is 0 to 1024
    // times the pH per interval of the A2D 14/1023
    double ph = sensorValue * (PH_RANGE / (double) A2D_RANGE);
    l.trace("sensorValue = {}  ph={}", sensorValue, ph);
    return ph;
    }
}