Auto Electronic School Bell Electronics Mini Project

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School Bell is conventionally rung by a person who has been designated to do it. This is done on a periodic basis. With the advent digital electronics, this task can be automated by this project that has been specially designed for this scenario. It can be used in School for ringing class timeout bells as well as in factories and industries for various purposes.
A Bell can be connected at the output side of the project board. This bell will be rung by the system on a periodic basis to signify to the persons around it to start a task or about timeout of a task. This feature is helpful for teachers in school to timely take classes. It can be useful in factories to start work, indicate breaks as well as closing of the factory. The design of the circuit makes this project possible to count periods of 45 minutes and a lunch break of 30 minutes.
In order to count time of 30 minutes and 45 minutes two decade counter in conjunction with 555NE timer are used. When the respective timing signals have reached the time set in it they fire an SCR which enables AC power output at the Bell connector. The start and end of the sequence of Bells are controlled by a push button that is interfaced to the circuitry.