PIR Motion Sensor

This is a simple to use motion sensor.
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 unit works great from 5 to 12V (datasheet shows 12V).
You can also install a jumper wire past the 5V regulator on board to make this unit work at 3.3V.
Sensor uses 1.6mA@3.3V.
 

The alarm pin is an open collector meaning you will need a pull up resistor on the alarm pin. The open drain setup allows multiple motion sensors to be connected on a single input pin. If any of the motion sensors go off, the input pin will be pulled low.
 

The connector is slightly odd but has a 0.1" pitch female connector making it compatible with jumper wires and 0.1" male headers.

Note: The colors of the wires can vary greatly. Looking at the unit from the top, the middle wire is ground, the left-most wire is the alarm, and the right-most is the power.

 

Documents:

• Datasheet
• Bildr Tutorial