Download Adafruit_TCS34725

To begin reading sensor data, you will need to install the

The easiest way to do that is to open up the Manage Libraries... menu in the Arduino IDE

Then search for Adafruit TCS34725 and click Install

We also have a great tutorial on Arduino library installation at:

Test the Sensor

Run the TCS34725 test sketch to verify that your sensor is working properly.

Upload the sketch to your Aruduino or Flora and open the Serial Monitor to see the output. The sketch should print out basic color measurement parameters as shown below. Move the sensor around, cover it and/or expose it to different light sources to see how it reacts.

Color parameters reported are:


The ColorView sketch demonstrates reflected-light measurement using the on-board led. The white led is used to illuminate nearby objects and the sensor measures the light reflected from the object. The ColorView sketch then uses the RGB outputs of the sensor to drive an RGB led to match the color that is seen by the sensor!

ColorView Components

In addition to a processor and a color sensor, you will need an RGB LED and some resistors:
  • 1x 1K ohm resistor (Brown, Black Red Gold)
  • 2x 560 ohm resistor (Green Blue Brown Gold)

ColorView Wiring

In addition to the basic power and I2C wiring, you will need the following connections:
  • LED common anode (long pin) -> 5v.
  • LED Red Pin -> 1K resistor -> Arduino Pin 3
  • LED Green Pin -> 560 ohm resistor -> Arduino Pin 5
  • LED Blue Pin -> 560 ohm resistor -> Arduino Pin 6
Upload the ColorView sketch to your Arduino, then place different objects in front of the sensor. The LED color should match the color of the sensed object!

This guide was first published on May 21, 2013. It was last updated on Jul 23, 2024.

This page (Arduino Code) was last updated on Mar 08, 2024.

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