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invention

Door Beep

by legitBits

Published on October 20, 2017

It alerts you if there is somebody going into your room.

How To Make It

1

Make the circuit.
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2

Tape the ends of the alligator clips to the battery.
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3

Tape aluminum foil to the bottom of the door.
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4

Arrange the positions of the battery and aluminum foil so the circuit buzzes when the door opens.
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