Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Model Number	GY-33 / GY-31
Sensor Type	TCS3200D / TCS34725 RGB Color Sensor
Interface	I2C / UART / TTL Serial
Operating Voltage	3.3V - 5V DC
Detection Range	0mm - 10mm (Optimal)
Output Data	RGB Values, Hue, Saturation, Temperature
PCB Dimensions	22mm x 18mm x 4mm
Compatibility	Arduino, Raspberry Pi, STM32, ESP32
LED Indicator	White LED for Illumination
Application	Color Sorting, Robotics, DIY Electronics

6 reviews

Anonymous

Mar 29, 2026

Rating: 5/5

Great upgrade from older models

Switched from an older photoresistor setup to this TCS34725 module. The difference in precision is night and day. It easily detects subtle shade differences.

Anonymous

Mar 26, 2026

Rating: 5/5

Perfect for my sorting robot project

This sensor module is incredibly accurate for distinguishing between different colored blocks. The I2C interface made integration with my Arduino Uno very straightforward. Highly recommended for hobbyists.

Anonymous

Mar 18, 2026

Rating: 4/5

Compact and easy to wire

The pinout is clearly labeled which saved me a lot of guessing. It fits perfectly into small enclosures. Only wish the cable was included, but that's a minor issue.

Anonymous

Mar 15, 2026

Rating: 5/5

Exceeded expectations

Fast response time and very stable output. I am using this for a line-following robot that needs to identify colored zones, and it performs flawlessly every time.

Anonymous

Mar 10, 2026

Rating: 5/5

Reliable and consistent readings

We bought ten of these for our workshop. They provide consistent RGB data and the build quality is solid. The white LED helps significantly when testing in dim environments.

Anonymous

Mar 03, 2026

Rating: 4/5

Good value but needs calibration

Works well once you spend time calibrating it for your specific lighting conditions. The documentation could be better, but there are plenty of tutorials online to help get started.

5 FAQ

Q: Can this sensor detect transparent objects?

A: No, this optical sensor relies on reflected light to determine color. Transparent or highly reflective mirror-like surfaces will not yield accurate color data.

Q: Does this module work directly with 5V Arduino boards without a logic level converter?

A: Yes, the GY-33/GY-31 modules typically support 3.3V to 5V input directly, making them compatible with 5V Arduino boards like the Uno without needing extra converters.

Q: What is the maximum distance for accurate color detection?

A: For the most accurate results, the sensor should be placed between 2mm to 10mm away from the object. Distances greater than 15mm may result in unreliable readings due to ambient light interference.

Q: How do I calibrate the sensor for white balance?

A: Place the sensor over a standard white reference tile and run the calibration function in the library. This adjusts the gain and integration time to normalize the RGB values.

Q: Is sample code available for Raspberry Pi?

A: Yes, we provide Python libraries and example scripts for Raspberry Pi on our GitHub repository. You can find the link in the product manual or contact us for direct access.

Explore your interests

STC32G12K128 STC8H8K64U Microcontroller Small System Core Board Development Board Emulator

$16.50

Youxin Electronics_STM32H743IIT6 Core Board System Board Learning Board STM32 Development Board

$118.00

Arduino DUE Development Board 32-bit ARM Controller A000062 Italian Official Original Import with Cable

$299.00

Ultrasonic Sensor HC-SR04 Ultrasonic Distance Measuring Module Bracket US015-025-026-100

$3.16

Serial SHT20 Chip Temperature and Humidity Sensor Test, SHT30 Chip Measurement and Monitoring Module by Viter Intelligence

$11.00

High-Speed Yabo Smart Raspberry Pi 4B Motherboard Development Board Accessories RaspberryPi 2G/4G/8G RAM Py

$494.30

Magnetic Circular Counting Chips, Two-Sided Flip Coins for Elementary Math, Kindergarten Early Education, Ten-Frame Matrix, Addition/Subtraction within 10 & 20, Teaching Tools

$11.90

3-Wire/4-Wire Flame Sensor Module, Fire Source Detection with IR Receiver, Flame Detection and Alarm

$1.08

SANSI White Label Class A Glass Graduated Cylinder C18 Micro-Precision Demulsification Cylinder with Scale Measurement Includes Certificate Ground Joint Stopper Hexagonal Bottom Borosilicate Glass Lab Equipment

$3.68

EV2400 Battery Unlock Fuel Gauge Programmer MSP430 HPA500 Evaluation Module Interface Board SMBus

$323.00

Cube Three-View Teaching Aid with Grid - 3D Geometry Observation Tool for Grades 4-5 Math (2cm Cubic Blocks Set)

$15.10

OrangePi Orange Pi Zero3 Zero 3 Development Board Allwinner H618 Orange Pi

$228.00

Digital 38KHz Infrared Receiver Transmitter Head Sensor Module Electronic Building Blocks Robot Infrared Communication Remote Control

$2.29

12V Stable Version Light-Control Switch No-Light Sensing with Extension Cable Photoresistor Plus Relay Module

$49.20

STM32 Smart Car 51 Microcontroller Arduino Obstacle Avoidance Chassis Kit Mecanum Wheel Robot Car

$40.80

Tech Small Production Small Invention DIY Piano Electronic Keyboard Real Playable Science Small Handmade DIY Materials

$33.00

HX711 Pressure Sensor Module Electronic Scale Bracket Weighing DIY Scale Pan Tray Set 5/10/40kg200

$3.28

Transparent 3D Geometric Model Perspective Decomposition Graphic Teaching Aid, Complete Set for Elementary Grades 1-6 Math

$6.80

Thin Film Pressure Sensor Display, USB Rechargeable Flexible Resistive Pressure Digital Display Module, Wide Range Wireless

$20.00

E18-D80NK Infrared Photoelectric Switch Diffuse Reflection Obstacle Avoidance Sensor Module 3-80CM

$12.60

LAN8720 Module Network Module Ethernet Transceiver RMII Interface Development Board Xinwei Electronics

$7.85

STC15W408AS Core Board Minimum System Board 51 Microcontroller Development Board TTSOP20 Learning Board

$18.47

New Version MEGA2560 R3 Development Board, Improved MEGA2560 R3 with Sensor Expansion Board

$13.68

Gradient Visual Illusion Kit: Electric Rotating Assembly Toy for Maker DIY, Paintable Handmade Model

$8.72

51/AVR Microcontroller Core Development Board STC89C52RC/51MCU Experiment Board/ATMEGA32 Learning Board

$37.90

[Trial Pack] Xianlang Complete Cat Treat Sticks Meal Packs Main Course Cans Freeze-Dried Cat Food Sample Snacks Gift Set

$15.00

5A Range Current Transformer Module Voltage Sensor Single-Phase AC Active Output Current Transmitter

$5.06

Foldable Clothes Drying Rack Floor Standing Home Balcony Bedroom Hanging Clothes Quilt Drying Artifact Outdoor Cooling Rod Indoor Drying Rack

$47.10

Metal Detector Module Non-Contact Metal Induction Sensor Detection Module Metal Detector

$8.70

RV1103 Miniature Linux Development Board: RISC-V Vision and AI with Ethernet Port

$53.10

For Arduino Development Board R3 Mainboard Microcontroller Module Kit Programming Learning Board Sensor Suite

$78.00

Xuefen Geometry Stamping and Tracing Set for Grades 1-2, 3D and 2D Ink Pads, Math Learning Tools, Cube and Cuboid Models

$4.51

Rubber Tire Toy 4WD Smart Car Wheels Car Model Robot Accessories (Suitable for 2mm Axle)

$0.50

E18-D80NK Infrared Obstacle Avoidance Sensor Proximity Switch Smart Robot Car 10-80cm

$6.30

Digital 38KHz Infrared Receiver/Transmitter Head Sensor Module for Electronic Building Blocks Robots, Infrared Communication Remote Control

$2.80

51 MCU Minimum System STC89C52 DIP40 Through-Hole Smart Car Main Control Board Learning Experiment

$19.80

Outdoor Adventure Kids' Insect Observation Box with Magnifying Glass, Boys & Girls Toy for Exploration, Butterfly Catching and Fish Scooping Tools

$7.80

MPU-9255 9-Axis Attitude 3-Axis Electronic Compass Accelerometer Gyroscope Magnetic Field Sensor Module

$13.42

Freeze-Dried Chicken Treats for Dogs: Nutritious Weight-Gain Breast Meat Chunks for Puppies – Teeth Cleaning, Grain Mixing, Universal Use

$3.90

Ningbo Keli SQB Cantilever Beam Weighing Module Sensor 100kg 500kg 1t 2t 3 Ton Small Floor Scale Inductor

$48.00