Sensor
HC-SR501 PIR Motion Sensor
The HC-SR501 is a Passive Infrared (PIR) sensor that detects motion by sensing changes in infrared radiation, typically from the body heat of people or animals moving within its range. It's one of the most common sensors used for motion-activated projects. How It Works:
Difficulty
Beginner → Advanced
Category
Electronics
How it works
How this sensor works
The sensor has a pyroelectric element that detects infrared radiation given off by warm objects. When a person or animal moves within the sensor's field of view, the change in infrared levels triggers the sensor's output pin to go high, signaling that motion was detected.
Applications
Common use cases
Required
Components needed
Projects
Related projects
Build something with this sensor.
Detecting Motion with HC-SR501 PIR Sensor on Raspberry Pi Pico
Learn how to use the HC-SR501 PIR motion sensor with a Raspberry Pi Pico to detect movement. This pr...
View projectDetecting Motion with HC-SR501 PIR Sensor on ESP32
Learn how to use the HC-SR501 PIR motion sensor with an ESP32 to detect movement. This project is us...
View project