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Arduino Electronic Brick PIR Sensor Brick
This brick includes a PIR motion sensor module,Max sentry distance is 5 meters. Connect the + pin to 5v and - pin to GND, if anyone moved in that range, S pin will go high for a while.
This birck work with Arduino Sensor Shield and Arduino Mega Sensor Shield via 3Pin Connect Cables.
Or directly with Iteaduino.