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Key Features:

• 5mm sensitive surface for accurate light detection

• Resistance decreases with increasing light intensity

• Works with Arduino, Raspberry Pi, and ESP32

• Ideal for automatic lighting, day/night sensors, and IoT

• Compact size suitable for breadboard and PCB use

• Two-terminal through-hole mounting

Product Description (Detailed):

The 5mm LDR (Light Dependent Resistor) is a passive electronic component that varies its resistance based on the intensity of light falling on it. When the light increases, its resistance drops, making it ideal for detecting light levels in circuits.

With a 5mm diameter sensing head, it is compact enough for miniature embedded systems, yet sensitive enough for reliable performance in home automation, solar lighting, and Arduino-based smart light controllers.

This LDR is widely used in analog light sensors, automatic streetlights, and photodetector applications in educational and industrial settings.

Technical Specifications:

How to Use:

1. Connect one terminal to Vcc (3.3V or 5V).

2. Connect the other terminal to GND through a resistor (e.g., 10KΩ).

3. Tap the voltage divider junction to an Arduino analog pin (e.g., A0).

4. Use analogRead() to measure and respond to light levels.

Common use: Voltage divider → LDR + resistor → analog input of Arduino.

Applications:

• Automatic streetlights and smart lighting systems

• Day/night light detectors

• Light-based alarm or automation circuits

• Brightness control for displays and LEDs

• IoT-based light monitoring and logging

• Arduino and Raspberry Pi light sensing projects

Package Includes:

• 1 × 5mm LDR (Light Dependent Resistor)