The 12mm LDR sensor is a light dependent resistor (a component whose resistance drops as light increases). In bright conditions its resistance falls to around 10 to 20KΩ, and in darkness it rises to hundreds of kilohms. The ldr sensor connects into a voltage divider with a fixed resistor and feeds an analog pin on Arduino or ESP32 boards.
One limitation is that the light dependent resistor does not give lux readings directly — you get a raw analog value that varies by ambient conditions, so calibrate for your setup. Students and hobbyists buy this 12mm ldr sensor from StemVolt, for automatic lighting and light-sensing projects. Drop it into a breadboard, wire a 10K pull-down, and read the analog pin straight away.
Related Product:
- Explore the 650nm Mini Laser Dot Diode Module
Features:
- Diameter of 12mm fits standard through-hole PCB footprints without any modification
- Compatible with 3.3V to 5V systems so no level shifting is needed for ESP boards
- Two-pin through-hole body allows direct breadboard or PCB insertion for quick testing
Technical Specifications:
| Specification | Details |
|---|---|
| Item Type | 12mm LDR sensor |
| Sensor Type | Light Dependent Resistor |
| Diameter | 12mm |
| No. of Pin | 2 |
| Operating Voltage | Compatible with 3.3V to 5V systems |
| Spectral Peak | 560 nm |
| Light Resistance | ~10 to 20KΩ |
Applications:
- An automatic night lamp uses this to turn on a light when the room gets dark
- A 12mm LDR sensor reads ambient brightness and controls LCD backlight intensity automatically
- A light dependent resistor in a line follower reads surface reflection to steer the robot
Package Includes:
- 1 x 12mm LDR Sensor
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