12mm GL12528 Light Sensitive Photoresistor LDR (Pack of 2)
The 12mm GL12528 Light Sensitive Photoresistor (LDR) is a high-sensitivity cadmium sulfide (CdS) photoconductive sensor designed to detect changes in ambient light intensity. Featuring a large 12mm sensing surface for enhanced optical coverage, its electrical resistance decreases significantly as light exposure increases—offering a light resistance of 10kΩ–20kΩ at 10 Lux and a dark resistance of up to 20MΩ. Operating up to 250V DC with a peak spectral response at 560nm (matching human eye sensitivity), this 2-pin through-hole component is ideal for automatic night lights, street light controllers, solar tracking systems, burglar alarms, and Arduino or Raspberry Pi light-sensing projects.
₹ 47
₹ 79
This sensor provides an easy and effective way to detect ambient light levels in electronic circuits.
Key Features
- 12mm photoresistor (LDR) size
- Resistance changes with light intensity
- High sensitivity to ambient light
- Simple 2-pin analog component
- No external power required for sensing
- Ideal for Arduino and microcontroller projects
- Low cost and easy to use
- Reliable for basic light detection applications
Technical Specifications
| Parameter | Specification |
|---|---|
| Sensor Type | Light Dependent Resistor (LDR) |
| Diameter | 12 mm |
| Resistance (Dark) | High resistance (MΩ range) |
| Resistance (Light) | Low resistance (kΩ range) |
| Response Time | Moderate |
| Operating Voltage | Passive component (no supply needed) |
| Material | Cadmium Sulfide (CdS) |
| Mounting Type | Through-hole (DIP style) |
How to Use
- Connect LDR in a voltage divider circuit
- Pair with a fixed resistor (e.g., 10K ohm)
- Read analog output using microcontroller (A0 pin)
- Higher light = lower resistance output
- Use readings for automation or control logic
- Calibrate threshold for switching applications
Applications
- Automatic street light systems
- Light-following robots
- Smart home lighting control
- Solar tracking systems
- Arduino light sensing projects
- Security light activation circuits
- Educational electronics experiments
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