The HC-SR501 PIR Motion Sensor detects human movement from body heat (infrared) up to about 7 metres. It has adjustable sensitivity and time delay and gives a simple HIGH output when motion is detected – used in automatic lights, security alarms and energy-saving projects.
| Model | HC-SR501 |
|---|---|
| Supply voltage | 4.5V – 20V DC |
| Output | Digital, 3.3V HIGH on motion |
| Range | up to approx. 7 m (adjustable) |
| Detection angle | < 120° |
| Delay time | approx. 5 s – 5 min (adjustable) |
| Trigger | Single / repeat (jumper) |
Why does it trigger at power-on?
It needs about 30–60 seconds to stabilise after power-on.
Can I buy the PIR Sensor Motion Detector Module HC-SR501 in Kanpur?
Yes – buy online with delivery across India, or pick it up from the iTechBuilders store, Damodar Nagar, Kanpur.
