Overview
The HC-SR501 is a popular and low cost passive infrared (PIR) sensor module used for motion detection.
The sensor is designed to detect motion by sensing changes in the infrared radiation levels emitted by objects within its field of view. It employs a pyroelectric sensor, coupled with a Fresnel lens to concentrate infrared signals onto the sensor element. The module's integrated signal processing circuit effectively filters out noise, resulting in a stable and dependable motion detection output.
It is widely employed in security systems, automation projects, lighting systems, and other applications requiring motion sensing.
Specification
Technical Specification for HC-SR501 PIR sensor.
| Operating Voltage | 5V to 20V DC |
|---|---|
| Output Voltage | 3.3V when motion is detected 0V when idle |
| Current Consumption | < 50 µA in idle mode |
| Detection Range | 3m to 7m (Adjustable) |
| Detection Angle | 120° |
| Trigger Modes | Single Trigger Repeatable Trigger (Select Trigger Jumper) |
| Delay Time | |
| Sensitivity | |
| Operating Temperature | -15°C to +70°C |
Pinout
Pinout for HC-SR501 PIR sensor.
| VCC | Connects to 5V to 20V DC |
|---|---|
| OUT | Signal Output |
| GND | Connects to power supply ground. |
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