Description
A PIR (Passive Infrared) Motion Sensor is an electronic device that detects motion by measuring infrared radiation (heat) emitted by objects, particularly humans and animals. It is widely used in security systems, automatic lighting, and IoT applications.
How It Works:
- The sensor consists of a pyroelectric sensor that detects changes in infrared radiation.
- When a warm object (like a human) moves within its detection range, the infrared levels change, triggering an output signal.
- It typically has adjustable sensitivity and delay settings to control detection range and response time.
Key Features:
- Operating Voltage: 3V to 5V (some up to 12V)
- Detection Range: 3–7 meters (varies by model)
- Detection Angle: ~110° to 180°
- Output: Digital HIGH (motion detected) or LOW (no motion)
- Delay Time: Adjustable (e.g., 2s to 5 minutes)
Common Uses:
- Motion-activated lights
- Security alarms and intruder detection
- Automatic doors
- Smart home automation
- Energy-saving systems
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