💡 L5528 Photoresistor (LDR) – Light Dependent Resistor, 5mm
A classic cadmium-sulfide light sensor that drops its resistance as light falls on it. The L5528 is the 5mm-diameter, 2-pin through-hole type that plugs straight into a breadboard, making it the simplest way to add light sensing to any project.
✨ Key Features
- Resistance falls from dark (megohms) to bright light (hundreds of ohms)
- Standard 5mm round CDS cell with two radial leads – breadboard friendly
- Fast, repeatable response to ambient light changes
- Pairs naturally with a fixed resistor to make a voltage divider for any ADC pin
- Supplied in a multi-piece bag, enough for many builds and spares
🔬 Specifications
- Model: L5528 (GL5528-class)
- Cell diameter: 5mm
- Spectral peak: around 540nm (visible light)
- Light resistance: roughly 10-20kΩ at 10 lux
- Dark resistance: about 1MΩ
- Power dissipation: 100mW max
- Maximum voltage: 150V DC
💡 Perfect For
Automatic night lights, street-light and lamp switching, line-following and light-seeking robots, brightness meters, solar tracker prototypes, and any analog light-level sensing.
