Type: Pyroelectric (Passive Infrared - PIR)

Operating Principle: Detects infrared radiation emitted by warm bodies (e.g., humans, animals).

Voltage Supply: Typically 3.3V to 5V DC

Output Signal: Digital (High/Low) – usually HIGH when motion is detected

Sensitivity Range: Up to 5–7 meters (adjustable on some models)

Detection Angle: ~110° horizontal, ~70° vertical

Delay Time: Output pulse duration adjustable (5 sec to several minutes)

Warm-up Time: Requires 30–60 seconds for stabilization

Pins: VCC, GND, OUT (signal)

Common Module: HC-SR501

Applications: Security systems, automatic lighting, occupancy detection

Note: Does not detect stationary objects; requires motion across heat sources.

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