HCSR501 PIR Motion Sensor (Passive Infrared Sensor)

The HC-SR501 PIR Motion Sensor is a highly reliable Passive Infrared (PIR) sensor module designed to detect human movement by sensing changes in infrared radiation emitted by people and other warm objects. It generates a digital HIGH output signal whenever motion is detected within its sensing range, making it an excellent solution for a wide variety of motion detection and automation applications.

The module features adjustable sensitivity and delay time controls, allowing users to customize the detection distance and the duration of the output signal according to their project requirements. Its low power consumption and stable performance make it suitable for continuous operation in both indoor and protected outdoor environments.

The HC-SR501 is widely used with Arduino, ESP32, Raspberry Pi, STM32, NodeMCU, and other microcontroller platforms. It is easy to integrate into electronic projects thanks to its simple three-pin interface and plug-and-play operation. Whether used for security systems, automatic lighting, smart home automation, energy-saving devices, or robotics, the sensor delivers dependable motion detection with minimal false triggering when properly installed.

Its compact size, reliable detection capability, and adjustable settings make it a popular choice among students, hobbyists, makers, engineers, and professionals developing motion-activated electronic systems.

Key Features

Detects human motion using Passive Infrared (PIR) technology.

Provides a digital HIGH output when motion is detected.

Adjustable sensitivity for customizing the detection distance.

Adjustable output delay time for flexible operation.

Detection range of up to approximately 7 meters.

Wide operating voltage range from 5V to 12V DC.

Low power consumption for energy-efficient operation.

High detection accuracy with stable and reliable performance.

Simple three-pin interface for quick integration.

Compatible with Arduino, ESP32, Raspberry Pi, NodeMCU, STM32, and other development boards.

Compact and lightweight design suitable for embedded applications.

Easy installation for DIY and professional electronics projects.

Specifications

Sensor Type: Passive Infrared (PIR)

Operating Voltage: 5V–12V DC

Output Signal: Digital HIGH/LOW

Detection Distance: Up to approximately 7 meters (adjustable)

Detection Angle: Approximately 120°

Delay Time: Adjustable

Sensitivity: Adjustable

Operating Temperature: Suitable for standard indoor environments

Interface: 3-Pin (VCC, OUT, GND)

Mounting: PCB with mounting holes

Applications

Motion-activated lighting systems.

Home and office security systems.

Intruder and occupancy detection.

Smart home automation.

Automatic door and entry systems.

Energy-saving lighting control.

Industrial automation projects.

Robotics and obstacle awareness.

IoT and embedded system applications.

DIY electronics and educational projects.