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How to Make a Drawer Alarm

How to make a Drawer Alarm, which sounds when a dark draw is opened.

As shown to the right, by simply adding a battery holder, switch and buzzer to a PCB built in the ‘light activated’ configuration you can create an alarm that sounds when a dark draw is opened and the PCB is exposed to light. The switch is to allow the alarm to be activated or deactivated.

how_to_make_a_drawer_alarm_1

Parts List:

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