12mm LDR Sensor

12mm LDR Sensor (Light Dependent Resistor) is a reliable and cost-effective light-sensing component designed to detect changes in ambient light intensity. Widely used in automatic lighting systems, light-activated switches, consumer electronics, and educational projects, this LDR sensor offers stable performance, high sensitivity, and long operational life.

An LDR works on the principle of photoconductivity, where the resistance of the sensor decreases as the intensity of light increases. The 12mm photosensitive surface provides improved light reception compared to smaller LDRs, making it ideal for applications that require accurate and consistent light detection. Its simple two-terminal design allows easy integration with microcontrollers, analog circuits, and digital systems.

Whether you are designing a day/night sensor, a streetlight automation system, or a light-responsive DIY project, the 12mm LDR sensor delivers dependable performance across a wide range of lighting conditions.

Key Features of 12mm LDR Sensor

• High Light Sensitivity
  Large 12mm sensing area ensures faster and more accurate response to changing light levels.

• Wide Resistance Range
  Exhibits high resistance in darkness and low resistance under bright light, enabling precise light intensity measurement.

• Low Power Consumption
  Ideal for battery-powered and energy-efficient electronic circuits.

• Fast Response Time
  Quickly adapts to changes in ambient light, suitable for real-time light detection applications.

• Compact & Lightweight Design
  Easy to mount on PCBs, breadboards, and prototyping boards.

• Simple Two-Pin Configuration
  Can be directly interfaced with microcontrollers like Arduino, ESP32, Raspberry Pi, and analog circuits.

• Cost-Effective Solution
  Provides reliable light sensing at an economical price, perfect for mass production and hobby projects.

Technical Specifications – 12mm LDR Sensor

• Sensor Type: Light Dependent Resistor (LDR)

• Photosensitive Diameter: 12 mm

• Material: Cadmium Sulfide (CdS)

• Resistance in Darkness: ≥ 1 MΩ

• Resistance in Bright Light (10–20 lux): 5–20 kΩ (typical)

• Operating Voltage: Not applicable (passive component)

• Power Consumption: Very low

• Response Time: Rise: ~20 ms, Decay: ~30 ms

• Spectral Peak: ~540 nm (close to human eye sensitivity)

• Operating Temperature: –30°C to +70°C

• Terminal Type: Through-hole, radial leads

• Lead Length: Standard PCB-mountable

Note: Electrical characteristics may vary slightly depending on manufacturing batch and ambient conditions.

Applications of 12mm LDR Sensor

The 12mm LDR sensor is widely used across various electronic and industrial applications due to its simplicity and effectiveness in light detection. Common applications include:

Automatic Lighting Systems

Used in streetlights, garden lights, and home lighting automation to switch lights ON at night and OFF during the day.

Day/Night Detection Circuits

Ideal for dusk-to-dawn sensors, emergency lighting systems, and security lighting.

Consumer Electronics

Integrated into TVs, mobile devices, display panels, and brightness control systems for automatic light adjustment.

Arduino & Microcontroller Projects

Popular in Arduino, Raspberry Pi, ESP8266, and ESP32 projects for light intensity measurement and control logic.

Alarm & Security Systems

Used in laser trip alarms, intrusion detection circuits, and light-triggered alarms.

Educational & Training Kits

Extensively used in electronics labs, STEM education, and DIY kits to demonstrate light sensing and voltage divider concepts.

Industrial & Commercial Applications

Applied in optical counters, light monitoring systems, and energy-saving automation equipment.

Why Choose the 12mm LDR Sensor?

The 12mm LDR sensor offers an excellent balance of sensitivity, durability, and affordability. Its larger sensing surface improves accuracy and reliability compared to smaller LDRs, making it suitable for both professional and hobbyist applications. With easy integration, low power requirements, and wide operating conditions, it remains one of the most trusted components for light-sensing solutions.

Enhance your electronic designs with the 12mm LDR Sensor and build efficient, responsive, and intelligent light-controlled systems with confidence.

Package Includes:

1 x 12mm LDR Sensor

FAQ

1. Where can we buy this 12mm LDR Sensor?

This product is available online https://aiiottech.in/product/12mm-ldr-sensor/ and also available at our store in Pudupakkam/Kelambakkam, Chennai-603103

2. When can I get this 12mm LDR Sensor after placing the order?

RGRJ AIIoT TECHNOLOGIES will immediately ship and deliver the product within 1-3 working days.

Video Link: Different Types of LDR