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5 mm LDR (Light Dependent Resistor) – Photoresistor
₹5.0
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The 5 mm LDR is a compact light-sensitive resistor whose resistance decreases with increasing incident light intensity. Commonly used in light sensing applications, this photoresistor enables simple and cost-effective detection of ambient light levels.
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Product Specifications
| Specification | Details |
|---|---|
| Type | Photoresistor (LDR) |
| Diameter | 5 mm |
| Spectral Peak Sensitivity | Around 520 nm (green light) |
| Resistance (Dark) | Typically 1 MΩ to 10 MΩ |
| Resistance (Bright Light) | Approximately 1 kΩ to 10 kΩ |
| Operating Voltage | Up to 150 V (depending on circuit) |
| Maximum Power Dissipation | 100 mW |
| Response Time | Typically 10 ms (depends on light intensity change) |
| Operating Temperature | -30°C to +70°C |
Key Features
- Compact 5 mm diameter suitable for compact circuit boards
- High sensitivity to visible light, especially green wavelengths
- Wide resistance range for accurate light level detection
- Low power consumption and passive component (no power required)
- Suitable for simple ambient light sensing and switching applications
- Easy to integrate with microcontrollers via voltage divider circuits
Applications
- Light level detection in consumer electronics
- Automatic lighting systems (street lights, night lamps)
- Alarm and security systems (light interruption detection)
- Robotics (line following and obstacle detection)
- Environmental monitoring projects
- DIY light-sensitive circuits and projects
Frequently Asked Questions
It usually ranges from 1 MΩ to 10 MΩ when no light is present.
Resistance decreases as the light intensity increases, allowing the device to detect varying light levels.
