The module is equipped with a photoresistor. It has a built-in voltage comparator - a binary signal is generated at the output. The potentiometer is used to adjust sensitivity of the device. It is also possible to connect the module to the microcontroller also by direct output from the sensor. Parameters 5V power supply TTL output (0 or 1) Sensitivity adjustable with a potentiometer LM393 comparator used Module (board) dimensions: 33mm x 15mm x 8mm Operation is indicated by the LED diode Useful links Arduino Light Sensor Interfacing - https://arduino-info.wikispaces.com/Brick-LightSensor-Analog-Digital Raspberry Pi Light Sensor Interfacing - http://www.uugear.com/portfolio/using-light-sensor-module-with-raspberry-pi/ https://elecena.pl/product/22607289/light-sensor-detector-module-lm393-arduino 2023-02-22 https://elecena.pl/product/22607289/light-sensor-detector-module-lm393-arduino 2025-10-29