Gravity: Digital Infrared Motion Sensor For Arduino (PIR Motion Detection / 110° / 7m Range)

5V plug-and-play PIR motion trigger for lights, alarms, props, and simple automation projects. Best for detecting moving people or animals.

A simple 5V PIR motion sensor for Arduino projects. Detect moving people, pets, or warm objects within up to 7 meters and use the digital output to trigger lights, alarms, sound effects, doors, or other actuators. Power it up and wait 1-2 seconds for the sensor to get a snapshot of the still room. If anything moves after that period, the 'alarm' pin will go low. This sensor checks for infrared heat in it's detecting angle. Human body, pets and several other things emit energy that the sensor is looking for, it compares with the snapshot and if there is a recent change it triggers.

Figure: Gravity: Digital Infrared Motion Sensor For Arduino (PIR Motion Detection / 110° / 7m Range)

Get on with Home alarm security audit gear and experiment with this sensor to get a better understanding about its efficiency and working method. Infrared motion detectors are common all around the world for many different appliances. It's great for an Arduino or home automation project that requires automated motion feedback. Commonly found on automatic trigger light systems, where lights are ON when someone is in range and OFF when no one is around. Save power or trigger other actuators like a door opener or pet feeder.

The delay of sensing is adjustable via the potentiometer on the back of the sensor.

To ease the difficult of using this sensor,  a GravityInterface is adapted to allow plug&play.  The IO expansion shield is the best match for this sound senor connecting to your Arduino. As this sensor can work at 3.3V which make it compatible with Raspberry Pi, intel edison, joule and curie.