LDR Photosensitive Light Sensor Module 4-Pin Digital Output – Adjustable Threshold, Arduino Compatible

The LDR Photosensitive Light Detection Sensor Module is a compact, 4-pin ambient light sensing module built around a high-sensitivity Light Dependent Resistor (LDR/photoresistor) detecting changes in environmental light intensity and outputting a clean digital signal directly to Arduino, ESP32, Raspberry Pi, and microcontroller-based projects. With an adjustable potentiometer threshold, comparator-based clean output, and strong 15mA drive capability, it’s the simplest and most reliable way to add light detection and light-operated switching to any electronics project.

Key Features:

• High-sensitivity LDR sensor — accurately detects ambient light intensity changes
• Digital comparator output — clean, stable HIGH/LOW signal with no noise
• Adjustable threshold potentiometer — set custom light level trigger point
• Strong drive capability (>15mA) — directly drives relay modules without buffer
• 4-pin interface — VCC, GND, DO, and analog output (some versions)
• Fixed bolt holes — secure PCB mounting in enclosures and panels
• Compact 32×17mm PCB — fits any project size
• Wide voltage range (3.5–5V) — compatible with Arduino, ESP32, and Raspberry Pi
• Direct microcontroller connection — no additional components needed
• Light-operated switch capable — pairs directly with relay module