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This brick includes a PIR motion sensor module,Max sentry distance is 7 meters. If anyone moved in that range, Alarm pin will go high. The signal duration can be adjusted from 0.3s-18s by the yellow potienmeter.
Hi, this senor is using PIR Motion sensor module , you could know its specification refer to (http://www.seeedstudio.com/depot/pir-motion-sensor-module-p-74.html?cPath=144_149)
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Deray Wu
