Pyroelectric IR Motion Sensor (HC-SR501) | PIR Sensor Board


Regular price $9.75

The PIR sensor is the most common used device for detecting motion. Have you seen motion-controlled light switches in public restrooms or patio lights of a house? These are paired with a PIR sensor–which uses changes in Infra-Red light to trigger a digital signal–to become active if there's motion detected.

More specifically, the sensor detects IR radiation on the basis of the characteristics that the polarization of pyroelectric material changes with temperature. It also includes compensation for preventing false readings due to temperature variation.

These sensors can be found in a wide range of applications such as security systems, burglar alarms, visitor acknowledgement, light switch control, and 'smart' toys. You can simply connect them to a digital pin on your favorite microcontroller board (e.g., Arduino) or single-board computer (e.g., Raspberry Pi), and get started detecting motion around them!

On this board, there are two adjustable potentiometer on the module that you can use to change the trigger sensitivity and the duration of the trigger signal. Note that the input voltage should be between 4.5–20VDC, and the output signal is either typically ~0.3V, and it rises to 5V when motion detected. It has an FOV angle of 110 degrees, and its maximum detection distance is 7m.

If you're looking for just the sensor inside the board, please see the listing for the Pyroelectric IR Motion Sensor (RE200B).