The LDR Sensor 12mm Light Dependent Resistor (CdS Photoresistor) is a highly sensitive light-detecting component used in a wide range of electronic circuits and automation projects. This photoresistor changes its resistance based on the intensity of light falling on its surface—its resistance decreases when exposed to bright light and increases significantly in darkness. This makes it ideal for automatic lighting systems, daylight detection, smart home projects, sensing circuits, DIY electronics, and Arduino or microcontroller-based light measurement applications.

This 12mm LDR offers fast response, high sensitivity, stable performance, and long-lasting durability. With a spectral peak at 540 nm, it accurately detects visible light and works perfectly for applications that need real-time brightness sensing. Whether used for simple night-lighting circuits or advanced sensor-based automation, this LDR provides consistent performance in indoor and outdoor environments.

Features:

• Maximum Voltage: 150V DC

• Maximum Power Rating: 100mW

• Spectral Peak Sensitivity: 540 nm

• Light Resistance Range: 10KΩ – 20KΩ

• Dark Resistance: 1MΩ

• Response Time: Rise 20 ms / Fall 30 ms

• High sensitivity to visible light

• Reliable CdS material construction

• 12mm photosensitive area for improved accuracy

• Stable performance in automatic control applications

• Ideal for analog light level measurement

• Fast and smooth resistance change according to brightness

How to Use

• Connect one end of the LDR to VCC and the other to an analog input pin through a resistor

• Use a voltage divider configuration to measure light intensity changes

• For Arduino or microcontroller use, read the analog value to detect brightness levels

• Suitable for day/night detection circuits by connecting to a transistor or relay module

• Can be used behind transparent or lightly diffused covers for protective enclosures

• Use in low-voltage sensing circuits for safety and reliability

Applications

• Automatic street lights

• Night-lamp activation circuits

• Smart home light automation

• Solar light controllers

• Light-sensitive alarms

• Garden lighting systems

• Mobile light sensors

• DIY electronics and robotics

• Photo-detector systems

• Light intensity monitoring projects

Specifications:

• Size / Diameter: 12mm

• Model: GL12528

• Voltage Rating: 150V DC max

• Power Rating: 100mW

• Spectral Peak: 540nm

• Light Resistance: 10KΩ–20KΩ

• Dark Resistance: 1MΩ

• Response Time: 20 ms rise, 30 ms fall

• Material: CdS / Carbon

• Type: Light Dependent Resistor (Photoresistor)

• Operating Principle: Resistance reduces as ambient light increases

Included in Package

• 1 x LDR Sensor 12mm Light Dependent Resistor (CdS Photoresistor)

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