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This simple security alarm circuit can help you secure your bike or scooter. It raises an alarm if someone tries to drive away your two-wheeler. You just need to connect the circuit to the vehicle’s wheel (preferably front wheel) through a thin flexible wire that can break easily.
Connect the bike’s wheel to the circuit with the wire in such a way that when someone tries to steal the bike, the wire would break. When that happens, the speaker in the circuit would generate a machine-gun sound, or some other alarming sound, and alert everyone around.
The prototype assembled on a breadboard for testing in EFY Lab is shown in Fig. 1. Circuit diagram of the security alarm is shown in Fig. 2.
This project will be published in a few weeks. If you want to access it now, refer to Electronics For You’s July 2022 Issue–print or ezine edition.
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