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Description
Features:
| CATEGORY | SPECIFICATIONS |
|---|---|
| Product Type | Passive Infrared (PIR) Human Body Motion Sensor Module |
| Model | HC-SR501 |
| Operating Principle | Pyroelectric infrared detection of human body heat and motion |
| Operating Voltage | DC 5 V – 20 V |
| Quiescent Current | ~65 µA (ultra-low power) |
| Output Type | Digital HIGH / LOW signal |
| Output Logic | Motion detected = HIGH, no motion = LOW (after delay) |
| Trigger Modes | H = Repeatable trigger, L = Non-repeatable trigger (jumper selectable) |
| Repeatable Mode | Output remains HIGH if continuous motion is detected; delay resets with movement |
| Non-repeatable Mode | Outputs HIGH once, then returns LOW after delay regardless of continued motion |
| Delay Time | Adjustable (commonly ~3–4 seconds default blocking time + adjustable delay range) |
| Blocking Time | ~3–4 seconds (prevents rapid re-triggering) |
| Detection Principle | Dual pyroelectric elements detect infrared differential changes |
| Detection Angle | ~120° (lens dependent) |
| Detection Sensitivity | Direction-sensitive (best detection when motion crosses sensor path) |
| Warm-Up Time | ~1 minute initialization (may produce unstable output during startup) |
| Lens Type | Fresnel lens (can be modified for angle control) |
| Photosensitive Control | Optional LDR support (not included by default) |
| Recommended Power Stability | Requires stable, filtered DC supply (USB chargers/unstable batteries not recommended) |
| Environmental Sensitivity | Sensitive to airflow, heat sources, sunlight, RF interference |
| Installation Orientation | Best detection when movement is perpendicular to sensor axis |
| Key Features | Repeatable trigger, low power, adjustable delay, high sensitivity |
| Applications | Security systems, automatic lighting, alarm systems, smart home automation, occupancy detection |
Package Includes:
1 x HC-SR501 PIR Motion sensor
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