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 2.5V–5.5V, 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 you’re 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 2.5V–5.5V 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 https://elecena.pl/product/22712583/adafruit-als-pt19-analog-light-sensor-breakout 2023-03-06 https://elecena.pl/product/22712583/adafruit-als-pt19-analog-light-sensor-breakout 2023-12-27 https://elecena.pl/product/22712583/adafruit-als-pt19-analog-light-sensor-breakout 2024-09-19 https://elecena.pl/product/22712583/adafruit-als-pt19-analog-light-sensor-breakout 2024-11-29 https://elecena.pl/product/22712583/adafruit-als-pt19-analog-light-sensor-breakout 2024-11-30 https://elecena.pl/product/22712583/adafruit-als-pt19-analog-light-sensor-breakout 2025-11-28 https://elecena.pl/product/22712583/adafruit-als-pt19-analog-light-sensor-breakout 2025-11-29