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For our reverse engineering project, we chose to use the smoke detector. This smoke detector consists of a sensor to detect smoke and a loud electronic buzzer to alert people within the building.
Use a screwdriver to pry open the plastic enclosure. It might be easier to push the buzzer through the hole, if you need extra leverage.
The buzzer is unhooked from the PCB board, by hands.
This is the circuit for the smoke detector. It is powered by a 9V battery. The 3 metal leafs are contacts for the buzzer and the bigger leaf is for the test button.
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