Description
The GY-2561 TSL2561 Luminosity Sensor Light Intensity Module is a high-precision digital light sensor that measures visible and infrared light to give a reliable lux reading similar to how the human eye perceives brightness.
Unlike basic photoresistors, the TSL2561 uses a digital I²C interface for stable, accurate data and supports programmable gain and integration time, making it suitable for both low-light and bright sunlight environments.
It’s ideal for Arduino, Raspberry Pi, ESP32, or any microcontroller project that needs to sense or adjust to ambient light conditions — from automatic lighting systems and display brightness control to environmental monitoring, IoT nodes, and robotic applications.
Features:
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Dual photodiodes for visible + infrared measurement
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Wide dynamic range (0.1 lux – 40,000+ lux)
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Programmable gain and integration time
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I²C digital output for easy connection to Arduino, Raspberry Pi, ESP32, etc.
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Compact and low-power design
Perfect for: smart lighting, plant growth monitoring, home automation, and weather stations.
Technical Specifications
| Parameter | Description |
|---|---|
| Model | GY-2561 TSL2561 |
| Sensor Type | Digital Light / Luminosity Sensor |
| Communication Interface | I²C (SDA, SCL) |
| Operating Voltage | 2.7 V – 3.6 V (some modules support 5 V input) |
| Light Range | 0.1 lux – 40,000+ lux |
| Photodiodes | 2 (visible + IR, and IR-only) |
| Gain Control | Programmable (1×, 16×) |
| Integration Time | Adjustable |
| I²C Addresses | 0x29 / 0x39 / 0x49 (selectable) |
| Dimensions | Approx. 20 × 15 mm |
| Output Type | Digital (Lux value) |
| Operating Temperature | –30 °C to +85 °C |
Package Includes
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1 × GY-2561 TSL2561 Luminosity Sensor Light Intensity Module
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1 × Set of header pins (unsoldered)
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