HC-SR501 PIR Motion Detector Sensor Module
The HC-SR501 is a passive infrared (PIR) motion detector module featuring a wide 4.5-20V DC input range and a 3.3V TTL output, making it directly compatible with microcontrollers like Arduino, Raspberry Pi, and ESP32 for human presence detection in security and automation projects.
Features
- Wide operating voltage range from 4.5V to 20V DC for flexible power supply integration.
- Low average current consumption of <60 µA for battery-powered, always-on applications.
- Adjustable detection distance from 3 meters to 7 meters via onboard sensitivity potentiometer.
- Configurable output delay time from 5 seconds up to 200 seconds to control relay activation period.
- Broad 140° detection cone with a pyroelectric sensor and Fresnel lens for reliable human motion sensing.
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The HC-SR501 module integrates a pyroelectric infrared (PIR) sensor, signal conditioning circuitry, and a Fresnel lens to detect changes in infrared radiation caused by moving human bodies. The onboard potentiometers allow for precise adjustment of the sensing range and the output signal hold time, providing customization for different application environments.
Designed for reliability across a wide temperature range from -20°C to +80°C, the module outputs a high-level 3.3V TTL signal upon detection, which can directly drive opto-isolators, transistors, or microcontroller GPIO pins. Its compact form factor and low power profile make it suitable for embedded security systems, lighting control, and energy management projects.
Additional Information
| Weight | 0.01 kg |
|---|---|
| Dimensions | 3.2 × 2.4 × 1.8 cm |
