Photosensitive Sensor Module Light- Dependent Control LDR

The Photosensitive Sensor Module is a light sensor board built around an LDR (light-dependent resistor) and an LM393 comparator. It compares the light level with a threshold you set on the onboard potentiometer and switches its digital output when it gets brighter or darker than that point. It connects directly to Arduino, ESP32 and ESP8266 digital inputs for automatic lights, day and night detection and light-following robots.

Photosensitive Sensor Module Specifications

• Sensor: LDR (photoresistor)
• Comparator: LM393
• Output: digital (DO), changes state when the light passes the threshold
• Threshold: adjustable with the onboard potentiometer
• Supply voltage: 3.3 V to 5 V
• Connection: header pins for Dupont jumper wires

Photosensitive Sensor Module Applications

• Automatic night lights and street-light models
• Day and night detection for smart home projects
• Light-seeking robots
• Alarms that trigger when a light beam is blocked
• STEM classes and sensor kits

What's in the Box

• 1 × LDR photosensitive sensor module

Tip: Set the threshold in the lighting where the module will be used: turn the potentiometer slowly until the output just changes state. Some versions also have an analog output (AO) that you can read with an analog pin to get a light level value instead of a simple on/off signal.

Orders placed before 14:00 are ready for pickup the same day. Delivery across Lebanon usually takes 1–3 working days.