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Create an alarm system and visitor counter for your room by ottojo Create an alarm system and visitor counter for your room by ottojo

“You want to get notified when someone enters your room? You want to know how many visitors you had? You want a device that says “Goodbye” everytime someone leaves? In this instructable i will explain how to do this using a Raspberry Pi and a photoelectric barrier unsing laser sensors.” – Create an alarm system and visitor counter for your room, http://goo.gl/J4XtdL

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