Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Model Number	GY-33 / GY-31
Sensor Type	TCS3200D / TCS34725
Operating Voltage	3.3V - 5V DC
Interface	I2C / TTL Pulse Output
Detection Range	0mm - 10mm (Optimal)
LED Indicator	White LED with Adjustable Brightness
PCB Dimensions	22mm x 18mm x 6mm
Mounting Holes	4 x 3mm Diameter
Compatibility	Arduino, Raspberry Pi, ESP32
Package Weight	5 grams

6 reviews

Anonymous

Mar 30, 2026

Rating: 5/5

Fast shipping and great quality

Arrived quickly and packaging was secure. The pins are clearly labeled, and the included documentation link was helpful for getting started immediately.

Anonymous

Mar 22, 2026

Rating: 4/5

Compact and efficient

Small form factor makes it easy to integrate into tight spaces. The only downside is that ambient light can interfere if not shielded properly.

Anonymous

Mar 21, 2026

Rating: 5/5

Perfect for Arduino projects

This sensor works flawlessly with my Arduino Uno. The color recognition is surprisingly accurate for the price point. Setup was easy using existing libraries.

Anonymous

Mar 18, 2026

Rating: 4/5

Good value but needs calibration

The module is solid and well-soldered. You do need to spend some time calibrating it for your specific lighting conditions, but once done, it performs well.

Anonymous

Mar 17, 2026

Rating: 5/5

Great for university projects

Used this for a final year sorting robot project. It reliably distinguishes between red, blue, green, and white objects. Highly recommend for students.

Anonymous

Mar 16, 2026

Rating: 5/5

Excellent I2C implementation

The TCS34725 version with I2C is much easier to wire than the pulse output versions. Library support is abundant, making coding a breeze.

5 FAQ

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

A: For the most accurate readings, the object should be within 3mm to 10mm of the sensor. Beyond 10mm, accuracy may decrease depending on ambient lighting.

Q: Does it distinguish between black and dark blue?

A: While it can detect low light values for black, distinguishing very dark colors depends heavily on calibration and lighting. We recommend testing with your specific materials.

Q: Is the onboard LED brightness adjustable?

A: Yes, the brightness of the integrated white LED can be adjusted via software commands to prevent washing out colors on reflective surfaces.

Q: Does this module come with a library for Arduino?

A: Yes, this sensor is compatible with popular open-source Arduino libraries such as Adafruit_TCS34725. You can install them directly via the Library Manager.

Q: Can this work with 3.3V logic levels?

A: Absolutely. The module operates on a voltage range of 3.3V to 5V, making it fully compatible with both 3.3V and 5V microcontrollers like ESP32 and Arduino.

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