// 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 from ControlEverything.com.

// https://www.controleverything.com/content/Humidity?sku=SHT30_I2CS#tabs-0-product_tabset-2

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);

}

}