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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

STEP 1 :

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Make the circuit.

STEP 2 :

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Tape the ends of the alligator clips to the battery.

STEP 3 :

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Tape aluminum foil to the bottom of the door.

STEP 4 :

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