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The PIR(Passive Infra-Red) Sensor is a pyroelectric device that detects motion by sensing changes in the infrared(radiant heat) levels emitted by surrounding objects.
Each Wide Angle PIR Sensor cable includes a 4-pin cable, as well as a mount and hardware to adapt to all RobotGeek products with a centimeter grid pattern (Workbenches, Geekbot, etc.). Mount it at a right angle, and flat.
Simplytronics ST-00081 Wide Angle PIR Sensor Data Sheet