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[SNO] 18 [PROJECT NAME] 
Self-Powered Door Bell Watcher: This very simple and self-powered device was conceived to allow a person to monitor if someone has rung his home door-bell when he was out. The circuit must be simply connected to the two door-bell-coil leads. An LED or a buzzer (or both) can be used to indicate the event (event is door-bell being pressed). It can store the event for a minimum of 15 days. It can be used for any mains supplied device like computer, television etc.
Top 25 Electrical Mini Projects for Engineering Students
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