The ALS PT19 is a tiny RoHS-compliant analogue ambient light sensor with strong IR rejection for a human-eye-like response. Power it from 2.5V5.5V, read the OUT pin, and the voltage rises as light levels increase.

The Adafruit ALS PT19 analogue light sensor is a tiny, straightforward way to add ambient light sensing to your project, and a great upgrade if youre currently using a photocell but need RoHS compliance. It has a high rejection ratio for infrared radiation, so its spectral response is closer to human eye sensitivity, making it well suited for general light-level detection.

Wiring is simple: connect to ground, + to a 2.5V5.5V supply, then read the analogue output voltage from the OUT pin. As the sensor detects more light, the output voltage increases.

Specifications

• Dimensions: 7.8mm x 10.6mm x 2.4mm
• Weight: 0.2g

Revision History

• As of Sep 21, 2022 – The PCB is a little thinner may be 3.2 or 1.6mm thick.

Resources

• Datasheet
• EagleCAD files
• Fritzing

Package Contents

• 1x Adafruit ALS-PT19 Analogue Light Sensor Breakout
• 1x 6-pin header