Here's how to make a lost aircraft alarm out of a cheap door alarm and a brushed ESC.
You'll need:
- a cheap 100 db door alarm from the dollar store. It runs on 4.5V (3 X 1.5V button cells)
- a brushed ESC to trigger on/off the alarm. I'm using an old GWS ICS50 2A ESC.
- foam board to make a sound box for the piezoelectric plate
It weighs about 16g.
See the wiring diagram below.
Alarm in action:
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