5mm LDR Light Dependent Resistor – High Sensitivity Photoresistor Sensor for Arduino & DIY Projects in Pakistan

Overview 

The 5mm LDR (Light Dependent Resistor), often called a photoresistor, is a light-controlled variable resistor. The resistance of this component decreases as the light intensity hitting it increases. In total darkness, it acts like an open circuit (mega-ohms), but under bright light, its resistance drops to just a few hundred ohms. This makes it incredibly easy to use with an Arduino or any analog circuit to trigger actions based on ambient light levels.

Key Features 

• High Sensitivity: Quickly reacts to subtle changes in light levels.

• Compact 5mm Size: Easily fits into breadboards, PCBs, and tight enclosures.

• Analog Simplicity: Can be used with a simple voltage divider circuit to get an analog reading on any microcontroller.

• Durable & Reliable: Epoxy encapsulated for long-term stability in various environments.

• Low Cost: The most affordable way to add light sensing to any student or hobbyist project.

Technical Specifications 

Feature	Specification
Model	GL55 Series (Commonly GL5516/GL5528)
Diameter	5mm
Max Voltage	150V DC
Max Power	100mW
Light Resistance (10 Lux)	10kΩ – 20kΩ
Dark Resistance (0 Lux)	>1MΩ – 2MΩ
Response Time	20ms (Rise), 30ms (Fall)
Operating Temp	-30°C to +70°C