Raspberry Pi ADT75 Temperature Sensor Java Tutorial

ADT75 is a highly accurate, digital temperature sensor. It comprises of a band gap temperature sensor and a 12-bit analog to digital converter for monitoring and digitizing the temperature. Its highly sensitive sensor makes it competent enough to measure the ambient temperature accurately. Here is the demonstration with a java code using Raspberry Pi.

1. Raspberry Pi

2. ADT75

3. I²C Cable

4. I²C Shield for Raspberry Pi

5. Ethernet Cable

Take a I2C shield for raspberry pi and gently push it over the gpio pins of raspberry pi.

Then connect the one end of I2C cable to ADT75 sensor and the other end to the I2C shield.

Also connect the Ethernet cable to the pi or you can use a WiFi module.

Connections are shown in the picture above.

The java code for SHT25 can be downloaded from our github repository- DCUBE Store.

Here is the link for the same :

https://github.com/DcubeTechVentures/ADT75/blob/master/Java/ADT75.java

We have used pi4j library for java code, the steps to install pi4j on raspberry pi is described here:

http://pi4j.com/install.html

You can also copy the code from here, it is given as follows:

// Distributed with a free-will license.

// Use it any way you want, profit or free, provided it fits in the licenses of its associated works.

// ADT75

// This code is designed to work with the ADT75_I2CS I2C Mini Module

import com.pi4j.io.i2c.I2CBus;

import com.pi4j.io.i2c.I2CDevice;

import com.pi4j.io.i2c.I2CFactory;

import java.io.IOException;

public class ADT75

{

public static void main(String args[]) throws Exception

{

// Create I2C bus

I2CBus Bus = I2CFactory.getInstance(I2CBus.BUS_1);

// Get I2C device, ADT75 I2C address is 0x48(72)

I2CDevice device = Bus.getDevice(0x48);

Thread.sleep(500);

// Read 2 bytes of data

byte[] data = new byte[2];

device.read(0x00, data, 0, 2);

// Convert the data to 12-bits

int temp = ((data[0] & 0xFF) * 256 + (data[1] & 0xF0)) / 16;

if(temp > 2047)

{

temp -= 4096;

}

double cTemp = temp * 0.0625;

double fTemp = (cTemp * 1.8) +32;

// Output data to screen

System.out.printf("Temperature in Celsius : %.2f C %n", cTemp);

System.out.printf("Temperature in Fahrenheit : %.2f F %n", fTemp);

}

}

ADT75 is a highly accurate, digital temperature sensor. It can be employed in a wide range of systems including environmental control systems, computer thermal monitoring etc. It can also be incorporated in industrial process controls as well as power system monitors.