kink_rider
New Member
Hiya, I am currently in the process of designing and building a bike alarm for my GCSE systems and control project. Basically my idea is an alarm that is triggered when a thief sits on your bike seat, I would like to build my own circuit and house it in a vacuum formed shell that slides underneath the seat rails. I am just struggling to find a suitable circuit diagram. I want the circuit to consist of a buzzer that is triggered by the compression of the foam on the seat e.g. micro switch or a reed switch and then de-activated by a key switch. I would like the buzzer to stay on for a certain time or until the circuit is turned off by a key switch and finally I would like it to be run by a 9V battery. Any help would be gratefully appreciated as the project needs to be completed by the 2/4/04. Thanks, Ollie.