Passive infrared (PIR) sensors are straightforward, low cost motion sensors perfect for maker projects!

All objects emit heat in the form of IR radiation. This sensor uses changes in IR radiation to detect motion in front of it up to a range of about 7m, so it's great for rigging up a simple motion detector like a basic security alarm, or for triggering a wildlife camera.

For more info on how PIR sensors work and how to hook them up to your microcontroller, check out  or .

Pinout

Looking at the bottom of the sensor with the pins at the top, the pins (from left to right) are:

• GND
• OUT
• VCC

If you pop off the white plastic dome, the pins are labelled on the top of the board.

Specifications