Ever wondered how to make a burglar alarm or how to beat it?... well its all about Passive Infra Red sensors, in other words heat sensors. PIR alarms sense moving heat so the trick is not to breathe and to be dressed like an Eskimo. The module: HC-SR501 works in a simple manner, basically 2 pins ...By: Robotix_au
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from Instructables: exploring - technology - robots http://ift.tt/1xUeEb8
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