Raspberry Pi - SHT30 Humidity & Temperature Sensor Java Tutorial

SHT30 Digital Humidity and Temperature Sensor offers superior performance and a space saving footprint. It provides calibrated, linearized signals in digital, I2C format. Fabrication of this sensor is based on CMOSens technology, which attributes to the superior performance and reliability of SHT30. The resolution of SHT30 can be changed by command, low battery can be detected and a checksum helps to improve communication reliability. Here is its demonstration of interfacing it with Raspberry Pi using Java code.

1. Raspberry Pi

2. SHT30

3. I²C Cable

4. I²C Shield for Raspberry Pi

5. Ethernet Cable

Take an 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 SHT30 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 SHT30 can be downloaded from our GitHub repository- Dcube Store.

Here is the link for the same :

https://github.com/DcubeTechVentures/SHT30...

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.

// SHT30

// This code is designed to work with the SHT30_I2CS I2C Mini Module available in Dcube Store.

import com.pi4j.io.i2c.I2CBus;

import com.pi4j.io.i2c.I2CDevice;

import com.pi4j.io.i2c.I2CFactory;

import java.io.IOException;

public class SHT30

{

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

{

// Create I2C bus

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

// Get I2C device, SHT30 I2C address is 0x44(68)

I2CDevice device = Bus.getDevice(0x44);

// Send measurement command

// High repeatability measurement

byte[] config = new byte[2];

config[0] = 0x2C;

config[1] = 0x06;

device.write(config, 0, 2);

Thread.sleep(500);

// Read 6 bytes of data

// Temp msb, Temp lsb, Temp CRC, Humididty msb, Humidity lsb, Humidity CRC

byte[] data = new byte[6];

device.read(data, 0, 6);

// Convert the data

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

double cTemp = -45 + (175 * temp / 65535.0);

double fTemp = -49 + (315 * temp / 65535.0);

double humidity = 100 * (((data[3] & 0xFF) * 256) + (data[4] & 0xFF)) / 65535.0;

// Output data to screen

System.out.printf("Relative Humidity : %.2f %%RH %n", humidity);

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

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

}

}

SHT30 temperature and relative humidity sensor has various industrial applications like temperature monitoring, computer peripheral thermal protection and so on..