Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Sensor Model	TSL2561
Interface Protocol	I2C
Operating Voltage	3.3V - 5V
Light Spectrum	Visible and Infrared
Dynamic Range	1 to 40,000 Lux
Integration Time	Adjustable (13ms to 402ms)
Board Dimensions	22mm x 18mm
Mounting Holes	4 x 3mm
Weight	2.5 grams
Package Includes	1x GY-2561 Module

6 reviews

Anonymous

Mar 28, 2026

Rating: 5/5

Perfect for Arduino Projects

This sensor works flawlessly with my Arduino Uno. The I2C communication is stable, and the library support is excellent. Measuring ambient light for my smart home project was easier than expected.

Anonymous

Mar 21, 2026

Rating: 5/5

Compact and Reliable

Small form factor makes it easy to fit into tight enclosures. The data output is clean, and the adjustable integration time allows for fine-tuning based on specific environment needs.

Anonymous

Mar 21, 2026

Rating: 5/5

Excellent sensitivity

I was surprised by how well this distinguishes between different light sources. Using it to control LED strips based on room brightness, and the response is smooth and natural.

Anonymous

Mar 09, 2026

Rating: 4/5

Good value but needs careful wiring

The module itself is great and accurate. However, make sure you check your voltage levels if using with 3.3V logic boards. Once wired correctly, it reads lux values very consistently.

Anonymous

Mar 06, 2026

Rating: 5/5

Great for learning IoT

Bought this for a university project on automated lighting. The dynamic range is impressive, handling both dim indoor light and bright sunlight without saturating immediately. Highly recommended.

Anonymous

Mar 03, 2026

Rating: 4/5

Solid performance

Works as advertised. The only minor issue was that the included pin headers were not soldered, so I had to do that myself. Otherwise, the sensor accuracy is top-notch for the price.

5 FAQ

Q: What is the maximum lux value this sensor can accurately read?

A: The TSL2561 sensor has a dynamic range up to 40,000 Lux, making it suitable for both indoor and outdoor daylight applications.

Q: Can I use this underwater?

A: No, this module is not waterproof or water-resistant. It must be kept in a dry environment or housed in a sealed enclosure if used near moisture.

Q: Is this module compatible with Raspberry Pi?

A: Yes, the GY-2561 is fully compatible with Raspberry Pi via the I2C interface. Ensure you enable I2C in the Raspberry Pi configuration settings.

Q: Does this come with a library for ESP32?

A: While we do not provide a proprietary library, the TSL2561 is widely supported by community libraries available in the Arduino IDE and PlatformIO which work perfectly with ESP32.

Q: How do I change the integration time?

A: The integration time is adjustable via software commands sent over the I2C bus. You can select from 13ms, 101ms, or 402ms depending on your library functions.

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