LDR Sensor 5mm Light Dependent Resistor - Compoden
LDR Sensor (Light Dependent Resistor) - 5mm
The 5mm Light Dependent Resistor (LDR) is a passive component that changes resistance based on ambient light intensity. Commonly used in light-sensing circuits, it enables automatic brightness control, daylight detection, and twilight switching. Its small 5mm epoxy package makes it easy to integrate into breadboards and custom PCBs.
Key Specifications
| Specification | Value |
|---|---|
| Model | 5mm LDR (GL5528) |
| Light Resistance (10 lux) | 20–30 KΩ |
| Dark Resistance | 0.5 MΩ (min) |
| Spectral Peak | 540 nm |
| Response Time | 30 ms rise, 30 ms fall |
| Max Voltage | 150 V DC |
What You Can Build With This
- Automatic night lamp using a comparator circuit
- Light-controlled switch for outdoor garden lights
- Simple solar tracker to orient small panels
- Laser-based security tripwire alarm
Compatibility
This LDR works with any microcontroller or single-board computer that has an analog input, including Arduino Uno, ESP32, and Raspberry Pi Pico. It functions reliably with both 3.3V and 5V systems when used in a voltage divider configuration. Pair it with a 10KΩ resistor for standard light-level readings.
Wiring Notes
Solder one lead to VCC (5V or 3.3V) and the other to an analog input pin, with a 10KΩ resistor from that pin to GND. This creates a voltage divider where the output voltage rises as light increases. No additional pull-up or pull-down is required.
Why Buy from Compoden
Every component is sourced from verified suppliers and tested for compatibility before listing. We've spent 10 years building projects for makers, schools, and institutions across India. Ships from Bengaluru in 3-5 days. If defective on arrival, replace within 7 days.
Is this compatible with Arduino?
Yes, any Arduino board with an analog pin (Uno, Nano, Mega) can read the LDR's varying voltage. Use a 10KΩ resistor in a voltage divider circuit connected to an analog input.
What is the resistance in complete darkness?
In total darkness, resistance typically exceeds 0.5 MΩ. As light increases, resistance drops to a few hundred ohms under bright illumination.
Can it measure exact light levels in lux?
While not a precision photodiode, with calibration the LDR can provide approximate lux readings. It is best suited for detecting relative light changes or threshold-based triggers.
📦 Free Setup Handoff Document Included
Every Compoden order includes a free setup handoff document — step-by-step instructions to get your component working within minutes. Download it via QR code on your package. The handoff document is also trained to help you troubleshoot the majority of problems.
Ask Soldr above what you can build with this — it knows every Compoden kit this part appears in.
Shipping Information
- Prepaid Orders: ₹75 for orders up to ₹999, FREE shipping above ₹999
- COD Orders: ₹125 shipping + ₹50 COD fee = ₹175 total
- Delivery Timeline: Dispatch in 1-2 days, delivery in 2-7 days depending on location
Returns & Warranty
- 7-Day Return: Manufacturing defects only (approval required)
- Warranty: 7 days from delivery
- Non-Returnable: Batteries, consumables, cut wires, clearance items