Digital Luminosity / Lux / Light Sensor GY-2561 GY-2591

The TSL2591 and TSL2561 are both digital light sensors designed for various applications where ambient light sensing is required, such as display backlighting control, smart lighting, and environmental monitoring. Below is a comparison highlighting their key features and differences:

TSL2591

• High Dynamic Range: Capable of measuring very low to very high light levels.
• Lux Range: 188 µlux to 88,000 lux.
• Sensitivity: Highly sensitive, suitable for low light conditions.
• Digital Output: I²C interface.
• Resolution: 16-bit.
• Dual Diode Architecture: Has two photodiodes (one for visible light and one for infrared light).
• Programmable Interrupts: Allows the sensor to notify the microcontroller when a particular light threshold is exceeded.
• Operating Voltage: 2.7V to 3.6V.
• Package: 6-pin QFN.

TSL2561

• Moderate Dynamic Range: Suitable for a variety of light conditions but not as extensive as the TSL2591.
• Lux Range: 0.1 lux to 40,000 lux.
• Sensitivity: Less sensitive than the TSL2591, more suited to typical lighting conditions.
• Digital Output: I²C interface.
• Resolution: 16-bit.
• Dual Diode Architecture: Also has two photodiodes (one for visible light and one for infrared light).
• Programmable Interrupts: Similar feature for threshold-based interrupts.
• Operating Voltage: 2.7V to 3.6V.
• Package: 6-pin surface-mount package.

Key Differences

• Dynamic Range: The TSL2591 has a much higher dynamic range than the TSL2561, making it more suitable for applications requiring measurement in both very low and very high light levels.
• Sensitivity: The TSL2591 is more sensitive, which makes it better for low-light applications.
• Lux Range: The TSL2591 covers a broader range of light intensities compared to the TSL2561.
• Application Suitability: The TSL2591 is ideal for applications requiring precise light measurements across a wide range of conditions, whereas the TSL2561 is adequate for general-purpose light sensing.

Both sensors offer programmable interrupts and I²C interfaces, making them versatile for integration into various microcontroller-based projects.