Raspberry Pi and TCS34725 Color Sensor Java example

The TCS34725 device provides a digital return of red, green, blue (RGB), and clear light sensing values. An IR blocking filter, integrated on-chip and localized to the color sensing photodiodes, minimizes the IR spectral component of the incoming light and allows color measurements to be made accurately. The high sensitivity, wide dynamic range, and IR blocking filter make the TCS3472 an ideal color sensor solution for use under varying lighting conditions and through attenuating materials. This data is transferred via an I2C to the host.

Parts List

name	Link
Raspberry Pi	Raspberry Pi 3 Model B With WiFi & Bluetooth
TCS34725	1PCS CJMCU-34725 TCS34725 Color Sensor RGB color sensor development board module
connecting wire	Free shipping Dupont line 120pcs 20cm male to male + male to female and female to female jumper wire

Connection and Layout

This example is for a Raspberry PI 2 connected to the module

Code

This example worked well

[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.
// TCS34725
// This code is designed to work with the TCS34725_I2CS I2C Mini Module available from ControlEverything.com.
// https://www.controleverything.com/products

import com.pi4j.io.i2c.I2CBus;
import com.pi4j.io.i2c.I2CDevice;
import com.pi4j.io.i2c.I2CFactory;
import java.io.IOException;

public class TCS34725
{
	public static void main(String args[]) throws Exception
	{
		// Create I2CBus
		I2CBus bus = I2CFactory.getInstance(I2CBus.BUS_1);
		// Get I2C device, TCS34725 I2C address is 0x29(41)
		I2CDevice device = bus.getDevice(0x29);

		// Select enable register
		// Power ON, RGBC enable, wait time disable
		device.write(0x80, (byte)0x03);
		// Select ALS time register
		// Atime = 700 ms
		device.write(0x81, (byte)0x00);
		// Select Wait Time register
		// WTIME : 2.4ms
		device.write(0x83, (byte)0xFF);
		// Select control register
		// AGAIN = 1x
		device.write(0x8F, (byte)0x00);
		Thread.sleep(800);

		// Read 8 bytes of data
		// cData lsb, cData msb, red lsb, red msb, green lsb, green msb, blue lsb, blue msb
		byte[] data = new byte[8];
		device.read(0x94, data, 0, 8);
		// Convert the data
		int cData = ((data[1] & 0xFF) * 256) + (data[0] & 0xFF);
		int red = ((data[3] & 0xFF) * 256) + (data[2] & 0xFF);
		int green = ((data[5] & 0xFF) * 256) + (data[4] & 0xFF); 
		int blue = ((data[7] & 0xFF) * 256) + (data[6] & 0xFF);

		// Calculate final lux
		double luminance = (-0.32466 * red) + (1.57837 * green) + (-0.73191 * blue);

		// Output data to Screen
		System.out.printf("Red Color Luminance   : %d lux %n", red);
		System.out.printf("Green Color Luminance : %d lux %n", green);
		System.out.printf("Blue Color Luminance  : %d lux %n", blue);
		System.out.printf("IR Luminance          : %d lux %n", cData);
		System.out.printf("Ambient Light Luminance : %d lux %n", luminance);
	}
}

[/codesyntax]

Output

 

Links

TCS34725 RGB Light Color Sensor Recognition Module

• Imroving Color Sensor Lux Accuracy
• Calculating Color Temperature and Illuminance
• Color Classification with the TCS230
• Sensing color with the TCS230
• Colorimetry Tutorial
• Photo Sensor Response Part I: Sensitivity to Wavelength
• Photo Sensor Response Part II: Sensitivity to Temperature
• Compensating for Light Flicker on Optical Sensors