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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.
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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.
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The buzzer is unhooked from the PCB board, by hands.
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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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