Raspberry Pi and TSL2561 luminosity sensor Java example

This TSL2561 is an I2C light-to-digital converter TSL2561 that transforms light intensity to a digital signal. The TSL2561 features a selectable light spectrum range due to its dual light sensitive diodes: infrared and full spectrum. You can switch among three detection modes to take your readings. They are infrared mode, full spectrum and human visible mode.

When running under the human visible mode, this sensor will give you readings just close to your eye feelings.

Features

Selectable detection modes
High resolution 16-Bit digital output at 400 kHz I2C Fast-Mode
Wide dynamic range: 0.1 – 40,000 LUX
Wide operating temperature range: -40°C to 85°C
Programmable interrupt function with User-Defined Upper and lower threshold settings

Here is a typical module that makes it easier to work with the sensor

Parts List

Layout and Connection

Code

[codesyntax lang=”java”]

// 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.
// TSL2561
// This code is designed to work with the TSL2561_I2CS I2C Mini Module available from ControlEverything.com.
// https://www.controleverything.com/content/Light?sku=TSL2561_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;
import java.text.DecimalFormat;
import java.text.NumberFormat;

public class TSL2561
{
	public static void main(String args[]) throws Exception
	{
		// Create I2C bus
		I2CBus Bus = I2CFactory.getInstance(I2CBus.BUS_1);
		// Get I2C device, TSL2561 I2C address is 0x39(57)
		I2CDevice device = Bus.getDevice(0x39);

		// Select control register
		// Power ON mode
		device.write(0x00 | 0x80, (byte)0x03);
		// Select timing register
		// Nominal integration time = 402ms
		device.write(0x01 | 0x80, (byte)0x02);
		Thread.sleep(500);

		// Read 4 bytes of data
		// ch0 lsb, ch0 msb, ch1 lsb, ch1 msb
		byte[] data=new byte[4];
		device.read(0x0C | 0x80, data, 0, 4);

		// Convert the data
		double ch0 = ((data[1] & 0xFF)* 256 + (data[0] & 0xFF));
		double ch1 = ((data[3] & 0xFF)* 256 + (data[2] & 0xFF));

		// Output data to screen
		System.out.printf("Full Spectrum(IR + Visible) : %.2f lux %n", ch0);
		System.out.printf("Infrared Value : %.2f lux %n", ch1);
		System.out.printf("Visible Value : %.2f lux %n", (ch0 - ch1));
	}
}

[/codesyntax]

Testing

run this as sudo  pi4j TSL2561.java

Links
Luminosity Sensor Breakout GY-2561 TSL2561 Light Module