Make With: HC-SR501 PIR Motion Sensor

Make With focuses on a collection of parts that can be used with Arduino, Raspberry Pi and more!

Many microcontroller projects are based around detecting movement and then reacting to that movement by triggering a relay, and alarm, a light or more. The HC-SR501 seems to be the motion sensor that is most available and most used in projects. You can easily purchase your own via Amazon, eBay and other sources.

The HC-SR501 only requires one digital pin for signalling to an Arduino or other microcontroller and reports with 5V HIGH when movement is detected. Other pins connect to VCC and GND.

Two on-board potentiometers allow adjustment of motion sensitivity and time delay between motion detections.

Links:

HC-SR501 Basic Datasheet from GitHub
HC-SR501 at Amazon.com

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