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Read temperature

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Posts: 31
Joined: Tue Sep 12, 2017 7:26 am

Read temperature

Post by kmcloutier » Tue Dec 12, 2017 1:07 pm

Sometimes you want to know the temperature in your applicaiton. You can use a temperature probe and the JNIOR.
package samplereadtemp;

import com.integpg.sensor.SensorPort;
import com.integpg.system.ArrayUtils;
import com.integpg.system.JANOS;

public class SampleReadTemp {

    public static void main(String[] args) {
        // read the registry key that holds the ID of the first temperature sensor
        String tempIdString = JANOS.getRegistryString("Externals/DeviceOrder/Type28_1", null);

        // error if the registry key is not defined.  This should automatically be defined by JANOS when the 
        // temperature device is present.
        if (null == tempIdString) throw new RuntimeException("No Temperature Device present");

        // convert the tempIdString to a long address
        long address = parseHexAsLong(tempIdString);

        try {
            // use the address and try to read the device block
            byte[] deviceBlock = SensorPort.readDeviceBlock(address);

            // convert the device block to a double value.  first we convert the read bytes to a long value.  then 
            //  convert the long value to a double value
            long longBits = ArrayUtils.getLong(deviceBlock, 0);
            double temperatureCelsius = Double.longBitsToDouble(longBits);
            System.out.printf("temp: %.2f C\r\n", temperatureCelsius);

            // convert to fahrenheit
            double temperatureFahrenheit = temperatureCelsius * 9 / 5.0 + 32;
            System.out.printf("temp: %.2f F\r\n", temperatureFahrenheit);
        } catch (IOException ex) {

    public static long parseHexAsLong(String s) {
        if (s == null) return 0;
        int len = s.length();
        long l = Long.parseLong(s.substring(0, len - 8), 16);
        l <<= 32;
        l += Long.parseLong(s.substring(len - 8), 16);
        return l;
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