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The HC-SR501 PIR Motion Sensor is a passive infrared (PIR) sensor used to detect the movement of people or animals by sensing changes in infrared (heat) radiation. It is commonly used in security systems, automatic lighting, smart homes, and IoT projects.
Operating Voltage: 4.5–20 V DC (5 V recommended)
Output Voltage: 3.3 V (HIGH), 0 V (LOW)
Detection Range: 3–7 m (adjustable)
Detection Angle: Approximately 110°
Delay Time: Adjustable (about 3 seconds to 5 minutes, depending on module version)
Warm-up Time: 30–60 seconds after power-on
Standby Current: Less than 50–65 µA