help for developing automatic ringing school bell

[Hiteshgiri Goswami]

i want to make a ringing bell which rings automatic as per many set times for school .And for that i want help how to do that. Please share your idea and suggestions.
Thank you very much.

[rpdom]

You've already posted this question once and had replies, haven't you?

[jamesh]

I believe so. Locking.