LDR Light Sensor Module 4-Pin (LM393 Comparator)

The LDR Light Sensor Module 4-Pin (LM393 Comparator) is a photoresistor-based sensor board that detects ambient brightness for automation and robotics projects. Built around the LM393 voltage comparator, it outputs both a clean digital switching signal and a raw analog voltage, making it simple to wire into any Arduino or microcontroller project.

Key features:

• Sensing Element: A light-dependent resistor (LDR) whose resistance changes with ambient light level.
• Comparator IC: LM393 voltage comparator delivers a clean, noise-free digital output.
• Sensitivity Adjustment: Onboard blue potentiometer sets the light-level trigger threshold.
• Dual Output: 4-pin header (VCC, GND, DO, AO) gives both digital and analog readings.
• Status Indicators: Onboard power and output LEDs show operating state at a glance.
• Supply Voltage: Runs from 3.3V to 5V, compatible with most microcontroller boards.

Common uses include automatic night lights, light-triggered alarms, and line-following or light-seeking robots.