LED
LCD
Product Overview
The 7mm LDR is the “middle ground” of photoresistors. It is small enough to fit into compact breadboard designs but features an increased sensing surface that makes it more reliable in fluctuating light conditions. Its resistance varies inversely with light intensity, providing a clean analog signal that microcontrollers can easily interpret to trigger actions based on the surrounding environment.
How to Use & Connections
Optimal Balance: Easier to handle and mount than the 5mm version while maintaining a low profile.
Analog Integration: Works perfectly with a 10KΩ resistor in a voltage divider circuit to provide 0-5V or 0-3.3V signals to an Arduino or ESP32.
Wide Detection: The 7mm head captures a broader angle of light, making it less sensitive to pinpoint shadows.
Technical Specifications
| Feature | Specification |
| Diameter | 7mm |
| Light Resistance (10 Lux) | 8KΩ – 15KΩ (Typical) |
| Dark Resistance (0 Lux) | 1MΩ – 3MΩ (Typical) |
| Peak Wavelength | 540nm |
| Max Voltage | 150V DC |
| Max Power Consumption | 150mW |
| Operating Temperature | -30°C to +70°C |
Key Features
Improved Sensitivity: Larger surface area compared to 5mm leads to more stable and accurate analog readings.
Rapid Response: Detects light transitions quickly, making it suitable for high-speed light-breaking triggers.
Breadboard Friendly: Standard lead spacing fits all common 0.1″ pitch solderless breadboards.
Durable Coating: Protective epoxy resin ensures long-term performance and resistance to humidity.
