LED
LCD
Product Overview
The 5mm LDR is a passive component that acts as a variable resistor. In total darkness, its resistance is very high (Megaohms), and as light intensity increases, the resistance drops significantly (down to a few hundred Ohms). This linear reaction to light makes it incredibly easy to interface with Arduino analog pins using a simple voltage divider circuit.
How to Use & Connections
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Analog Sensing: Connect one leg to VCC and the other to an Analog Input pin, with a 10K resistor pulled to Ground (GND).
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Sensitivity: It can detect everything from subtle shadows to direct sunlight.
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Orientation: The 5mm head should be pointed toward the light source for the most accurate readings.
Technical Specifications
| Feature | Specification |
| Diameter | 5mm |
| Light Resistance (10 Lux) | 10KΩ – 20KΩ (Typical) |
| Dark Resistance (0 Lux) | 1MΩ – 2MΩ (Typical) |
| Peak Wavelength | 540nm |
| Max Voltage | 150V DC |
| Max Power Consumption | 100mW |
| Operating Temperature | -30°C to +70°C |
Key Features
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Fast Response Time: Quickly detects changes in lighting conditions.
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Low Cost & Durable: An affordable solution for light sensing with a long operational life.
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Easy to Integrate: Works perfectly with Arduino, ESP32, and Raspberry Pi via analog-to-digital converters.
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Compact Size: The 5mm epoxy-coated head fits easily into breadboards and small project enclosures.
