PIR Sensor

A PIR Sensor is an electronic sensor used to detect motion by sensing changes in infrared (IR) radiation emitted by humans and warm objects. It is widely used in security systems, automatic lighting, and smart automation projects. The sensor only detects motion—it does not emit infrared radiation, making it energy efficient and reliable.

Key Features

• Detects human and animal motion

• Passive infrared sensing (low power consumption)

• Adjustable sensitivity and delay time

• Digital output (HIGH/LOW signal)

• Compact and lightweight design

• Easy to interface with Arduino, Raspberry Pi, and microcontrollers

Working Principle

The PIR sensor detects infrared radiation changes in its field of view. When a warm body (like a human) moves in front of the sensor, the IR levels change, triggering the output signal. When no motion is detected, the output remains LOW.

Technical Specifications

• Operating Voltage: 5V – 12V DC

• Output: Digital (HIGH/LOW)

• Detection Range: 3 to 7 meters (approx.)

• Detection Angle: ~120°

• Adjustable Delay Time & Sensitivity

• Warm-up Time: 30–60 seconds

Applications

• Motion-based security alarms

• Automatic lighting systems

• Smart home automation

• Energy-saving devices

• Robotics and DIY projects

• Automatic doors and appliances

Why Choose This PIR Sensor?

• Reliable and accurate motion detection

• Simple plug-and-play usage

• Ideal for beginners and professionals

• Widely supported in IoT and automation projects