PIR Motion Sensor

PIR Motion Sensor – Passive Infrared Sensor for Motion Detection Projects

 What is It?

A PIR (Passive Infrared) motion sensor detects movement of people, animals, or objects by sensing infrared radiation (heat) in its surroundings. It's commonly used in security systems, automatic lighting, and Arduino projects.

 Key Features:

• Voltage: 4.5V – 20V DC (5V typical for Arduino use)
• Detection Range: ~3 to 7 meters
• Angle: ~120°
• Delay Time & Sensitivity: Adjustable (via onboard potentiometers)
• Output Type: Digital (HIGH when motion is detected)
• Pins: VCC, GND, OUT

 Common Uses:

• Motion-activated lights
• Burglar alarms
• People counters
• Energy-saving automation

 Wiring with Arduino:

PIR Pin	Arduino Pin
VCC	5V
GND	GND
OUT	D2 (or any digital pin)

 Tips:

• Allow 10–60 seconds warm-up after powering on
• Place in a clear, unobstructed view for better detection
• Avoid direct sunlight or heat sources