Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Model Number	GY-2561
Sensor Type	TSL2561 Digital Light Sensor
Communication Interface	I2C (Inter-Integrated Circuit)
Operating Voltage	3.3V - 5V DC
Light Detection Range	0.1 to 40,000 Lux
Spectral Response	Visible and Infrared
Integration Time Options	13.7ms, 101ms, 402ms
Board Dimensions	22mm x 18mm x 3mm
Mounting Hole Diameter	3mm
Application Compatibility	Arduino, Raspberry Pi, ESP32

6 reviews

Anonymous

Mar 30, 2026

Rating: 5/5

Excellent documentation support

Found plenty of example code online for Arduino. The sensor responds quickly to changes in light intensity. Very happy with the purchase for my weather station build.

Anonymous

Mar 29, 2026

Rating: 5/5

Best budget light sensor

As a student working on a final year project, this was the perfect affordable solution. It delivers professional-grade data without breaking the bank. Highly recommended for educational use.

Anonymous

Mar 21, 2026

Rating: 4/5

Good for monitoring plant light exposure

Using this to log sunlight hours for my greenhouse. It's compact and low power. Deducted one star only because the PCB is a bit fragile, so handle with care during installation.

Anonymous

Mar 11, 2026

Rating: 5/5

Perfect for my home automation project

This sensor works flawlessly with my ESP32. The I2C communication is stable, and the library support is excellent. It accurately measures light levels in my living room to control smart blinds.

Anonymous

Mar 06, 2026

Rating: 5/5

Accurate and easy to integrate

I used this for a line-following robot that needs to adapt to ambient light conditions. The dynamic range is impressive, handling both dim indoor lighting and bright sunlight without saturation.

Anonymous

Mar 02, 2026

Rating: 4/5

Great value, minor soldering needed

The module performs well and provides consistent readings. Note that the header pins were not pre-soldered on my unit, so you will need to add them yourself. Otherwise, a solid choice for prototyping.

5 FAQ

Q: Does this module come with header pins included?

A: Yes, the package includes a set of male header pins, but they are not pre-soldered to allow for flexible mounting options.

Q: Do you provide a sample library for Raspberry Pi?

A: While we do not host a proprietary library, the TSL2561 is widely supported by community Python libraries available on GitHub and PyPI, such as 'adafruit-circuitpython-tsl2561'.

Q: What is the maximum cable length for the I2C connection?

A: For reliable I2C communication, we recommend keeping the cable length under 30cm (12 inches). If you need longer distances, consider using an I2C extender or buffer.

Q: Is it compatible with 5V Arduino boards like the Uno?

A: Absolutely. The module features an onboard voltage regulator and level shifting, making it safe to use with both 3.3V and 5V microcontrollers.

Q: Can this sensor distinguish between infrared and visible light?

A: The TSL2561 sensor has two channels: one for visible light only and one for full spectrum (visible + infrared). You can calculate the infrared component by subtracting the visible channel data from the full spectrum data in your code.

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