TCS34725 Color Sensor SKU: CQRSENYS001

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TCS34725 Color Sensor

Description

This module is the core color sensor of the TCS34725FN color light digitizer of ams AG. The sensor provides digital output of red, green, blue (RGB) and clear light sensing values. The integrated infrared blocking filter can minimize the infrared spectral components of the incident light, and can accurately perform color measurement. It has high sensitivity, wide dynamic range and infrared blocking filter. Minimize the effects of IR and UV spectral components to produce accurate color measurements. And with ambient light intensity detection and shieldable interrupt. Communication via I2C interface.

Specifications

Sensor Specifications

  • Product Category: Light to Digital Converters/TCS34725FN
  • Peak Wavelength: 525 nm
  • Maximum Operating Frequency: 400 kHz
  • Operating Supply Voltage: 3.3V to 5V
  • Operating Current: 235 uA
  • Maximum Operating Temperature: +70 Degree Celsius
  • Minimum Operating Temperature: -30 Degree Celsius
  • Interface Type: I2C
  • Maximum Fall Time: 300 ns
  • Maximum Rise Time: 300 ns
  • Resolution: 4-ch RGBC, 16-bit per ch
  • Recommended Measuring Distance: 20mm
  • Dimension: 30.5mm * 23mm
  • Mounting hole size: 3.0mm

Ocean interface Cable Specifications

  • Cable Specifications: 22AWG
  • Material: Silicone
  • Length: 21cm
  • Withstand Voltage: Less Than 50V
  • Withstand Current: Less Than 1000MA
  • Line Sequence: Red-Positive Power Supply; Black-Negative Power Supply; Green-I2C Data Input; Blue-I2C Clock Input; Yellow-Interrupt Output; Orange-Light Emitting Diode.
TCS34725FN Color Sensor-B.jpg

Hardware Description

Chip

Media: TCS3472_DataSheet.pdf

TCS34725 is used for color sensing. TCS34725 is an I2C bus-based color light-to-digital converter with an IR filter, providing a digital return of red, green, blue (RGB), and clear light sensing values. The high sensitivity, wide dynamic range, and IR blocking filter make the TCS34725 an ideal color sensor solution for use under varying lighting conditions and through attenuating materials.

Communication Protocol

I2C bus has two lines, one is a data line (SDA) and another is a lock line (SDL). There are three kinds of signals when communicating, Start signal, Stop signal, and Answer signal.

CQRSENYS001-1.jpg
  • Start Signal: When SCL is High, SDA change from High to Low, it start to transmit data
  • Stop Signal: When SCL is High, SDA change from Low to High, it stops transmitting.
  • Answer Signal: Every time IC sends back a certain Low plus to the sender after it receives 8 bits of data.

I2C Write

CQRSENYS001-2.png

When working, Raspberry Pi (hereafter named as Master) will first send a Start signal, then send a byte to TCS34725(hereafter named as Slaver), whose first 7bits are the address of Slaver and 1 bit write bit. Slave response with Answer signal every time it receives any data. Master sends command register address to Slaver, then data of command register. Stop signals are sent to slaves to stop communicating.

I2C Read

CQRSENYS001-3.png

When working, Master will first send a Start signal, then send a byte to Slaver, whose first 7bits are the address of Slaver and 1 bit write bit. Slave response with Answer signal every time it receives any data. Master sends command register address to Slave. After that, Mater will send a Start signal again, and then send a byte (7bits address and 1bit read bit) to Slaver. Slaver response and send data of the register to Master, master answer as well. Stop signals will be sent to stop communicating.

I2C Address

The I2C device address of TCS34725 is 0x29

CQRSENYS001-4.png

Note: 0x29 is 7bit in fact, therefore, when you set the I2C address, you should left-shift one bit, turn it to 0x52

Connection Diagram

TCS34725FN Color Sensor-C.jpg

Raspberry Pi Application

Enable I2C Interface

Open a terminal and run the following commands： 

sudo raspi-config 
Choose Interfacing Options -> I2C ->yes

CQRSENYS001-5.png

Reboot Raspberry Pi： 

sudo reboot

Install libraries

BCM2835 libraries 

wget http://www.airspayce.com/mikem/bcm2835/bcm2835-1.68.tar.gz
tar zxvf bcm2835-1.68.tar.gz 
cd bcm2835-1.68/
sudo ./configure && sudo make && sudo make check && sudo make install

Install wiringPi 

sudo apt-get install wiringpi
wget https://project-downloads.drogon.net/wiringpi-latest.deb
sudo dpkg -i wiringpi-latest.deb
gpio -v

Python3 

sudo apt-get update
sudo apt-get install python3-pip
sudo apt-get install python3-pil
sudo apt-get install python3-numpy
sudo pip3 install RPi.GPIO
sudo pip3 install spidev

Download examples

Open a terminal of the Raspberry Pi 

sudo apt-get install p7zip-full -y
sudo wget https://www.waveshare.com/w/upload/a/a1/TCS34725_Color_Sensor_code.7z
7z x TCS34725_Color_Sensor_code.7z -O./TCS34725_Color_Sensor_code
cd TCS34725_Color_Sensor_code/RaspberryPi/

Hardware Connection

CQRSENYS001-6.png
CQRSENYS001-7.jpg

Download and Run the Test Examples

Media: TCS34725 Color Sensor-Raspberry Pi.rar

Run Examples

C examples 

cd ~/TCS34725_Color_Sensor_code/RaspberryPi/
cd wiringPi
sudo make clean
sudo make 
sudo ./main

Python example 

cd ~/TCS34725_Color_Sensor_code/RaspberryPi/
cd python
sudo python main.py

Expected result

The RGB data are printed in terminal:

CQRSENYS001-8.jpg

CQRSENYS001-9.jpg

R, G, B values are printed in RGB888 format (DEC), C is light value without processing, RGB565 and RGB888 are HEX data printed in a certain format. LUX is light value processed. CT is color temperature. (https://en.wikipedia.org/wiki/Color_temperature) If you want to measure CT, please turn off the LED. INT is interrupted, 1: light value is over the threshold.

You can turn the RGB value to color with tools:

Media: TCS34725 Color Sensor Tool-Raspberry Pi.rar

CQRSENYS001-10.jpg

Arduino Application

The Arduino example is written for the Arduino UNO. If you want to connect it to other Arduino boards, you may need to change the connection.

Hardware Connection

CQRSENYS001-11.jpg

CQRSENYS001-12.jpg

Download and Run the Test Examples

Media: Adafruit_TCS34725-1.4.4_Arduino.rar

Examples

  • Install the Arduino IDE in your PC
  • Download the demo codes to your PC and unzip
  • Go into TCS34725_Color_Sensor_code/Arduino/Color_Sensor
  • Run the Color_Sensor.ino file
  • Select the correct Board and the Port

CQRSENYS001-13.jpg

  • Build the project and upload it to the board.
  • Open the serial monitor of the Arduino IDE or the SSCOM software and check the serial data.

R, G, B values are printed in RGB888 format (DEC), C is light value without processing, RGB565 and RGB888 are HEX data printed in a certain format. LUX is light value processed. CT is color temperature. (https://en.wikipedia.org/wiki/Color_temperature) If you want to measure CT, please turn off the LED. INT is interrupted, 1: light value is over the threshold.

You can turn the RGB value to color with tools:

Media: TCS34725 Color Sensor Tool-Arduino.rar

CQRSENYS001-15.jpg

STM32 Application

The STM32 examples are based on the STM32F103RBT6 and the STM32H743. The connection provided below is based on the STM32F103RB. If you need to use other STM32 boards, you may need to change the hardware connection and port the code yourself.

Hardware Connection

CQRSENYS001-16.jpg

Download and Run the Test Examples

Media: TCS34725 Color Sensor-STM32.rar

Examples

The examples are developed based on the HAL libraries. Download the Demo codes archive to your PC. Unzip and find the STM32 project from TCS34725_Color_Sensor_code\STM32\XNUCLEO-F103RB\MDK-ARM.

  • Open the TCS34725_Color_Sensoc.uvprojx file by Keil
  • Build and the project
  • Program the project to your STM32 board.
  • Connect the UART1 of your STM32 board to the PC and check the serial data by SSCOM software.

R, G, B values are printed in RGB888 format (DEC), C is light value without processing, RGB565 and RGB888 are HEX data printed in a certain format. LUX is light value processed. CT is color temperature. (https://en.wikipedia.org/wiki/Color_temperature) If you want to measure CT, please turn off the LED. INT is interrupted, 1: light value is over the threshold.

You can turn the RGB value to color with tools:

Media: TCS34725 Color Sensor Tool-STM32.rar

CQRSENYS001-18.jpg

FAQ

1,Question:

Whiy does the data are all be 0?

Answer:

Please check if you connect the correct pins.

2,Question: All the RGB data output is 253 as the picture.

CQRSENYS001-19.jpg

Answer:

In this case, the light intensity exceeds the inspection range, and reducing the gain can solve the problem (modify in the initial, or rewrite the gain setting TCS34725_Set_Gain(TCS34725_GAIN_16X) after the initialization).

3, Question:

The color is abnormal after changing the integration time?

Answer:

Because the integration time determines the maximum value of the RGBC channel data, modifying the integration time will result in darker or whiter colors. Just need to increase or decrease the brightness of the LED.

4,Question:

Modifying the integration time cannot trigger an interrupt or keep repeating the interrupt?

Answer:

The interrupt is compared with the data in the Clear channel. The data in the Clear channel is related to the integration time. After actual measurement, the gain is 60 times.

CQRSENYS001-20.jpg

Therefore, you should modify the threshold value if sample rate is fast. And please increase brightness of LED when you set integrate time to 2.4ms.

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