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A motorcycle alarm is a device that minimizes the chance of thieves in stealing motorcycles. Though there is really no way to completely prevent a thief from stealing, an alarm gives the owner a chance to know that someone is trying to steal his motorcycle. In this project, a simple circuit is designed to trigger a siren whenever someone tries to move a locked motorcycle. The whole circuit is composed of passive components, circuit protection, diodes, transistors, relays, and normally open switches. Read more