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Parallax PIR Sensor KickStart (#555-28027)
What It Can Do
• Detects motion of humans or animals from as far away as 30 feet
• Silent operation for alarms, motion activated nightlights, holiday props
• Automatically resets after period of inactivity
Passive infrared (PIR) sensors detect motion by comparing the amount of infrared radiation that
reaches a pair of detectors. When the two detectors “see” different values, the sensor indicates it
as movement of an object, such as a person or an animal. PIR sensors are often used in driveway
security systems, which turn on a light (but only at night) when someone approaches the house.
The Parallax PIR Motion Sensor has a simple on/off output: when on, the sensor is detecting
movement. When movement stops the output turns off (after a short delay). The output of the
sensor can be directly connected to a microcontroller, and operates much like a switch. You can
use the on/off condition to directly read the current status of the PIR sensor.
A selectable jumper on the sensor lets you set working distance:
• L (for Long) position, the effective sensor distance is up to 30 feet. This increases the sensitivity
of the sensor, which may also cause more false triggers.
• S (for Short) position, the sensor distance is up to 15 feet.
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