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The HC-SR501 module is designed to detect motion, primarily the movement of a human body within its range, using an onboard pyroelectric sensor combined with conditioning circuitry and a dome-shaped Fresnel lens that focuses incoming infrared radiation onto the sensing element. It's a considerably more configurable sensor than a fixed-behaviour PIR module, with adjustable delay and sensitivity potentiometers built directly onto the board.
Detection range is rated at 300 to 700cm, and the detection angle is under 140 degrees, giving fairly broad room coverage from a single ceiling or wall-mounted position, which is why this module is a common choice for general-purpose room occupancy and security lighting projects.
Sensitivity can be tuned across roughly 3 to 7 meters, and time delay, meaning how long the output stays triggered after motion is detected, is adjustable from about 5 to 200 seconds, with a default of 5 seconds plus or minus 3 percent. A blockade time of 2.5 seconds by default prevents the sensor from re-triggering immediately after resetting, avoiding rapid on-off flickering.
Operating voltage spans a wide 4.5 to 20VDC, current consumption averages just 0.06mA, and output is a 3.3V TTL high/low signal. The board measures 32mm by 24mm by 18mm and weighs 10g, and it's compatible with Arduino, Raspberry Pi, AVR, PIC and 8051-based projects, operating across -20C to 80C.
Anyone building a security light, an occupancy sensor, or a motion-triggered alarm who wants to fine-tune both how far the sensor reaches and how long it stays triggered after detecting movement will find the HC-SR501's adjustable potentiometers genuinely useful compared to a fixed-behaviour PIR sensor.
300 to 700cm, adjustable via an onboard potentiometer.
Yes, from about 5 to 200 seconds.
Under 140 degrees.
4.5 to 20VDC.
Arduino, Raspberry Pi, AVR, PIC and 8051-based projects.
| Brand | Generic |
|---|---|
| Output Signal | Digital |
| Sensor Type | Pyroelectric Infrared (PIR) |
| Selling unit | PCS |
