Long delay

Hi all

I wish to make a device with 89C2051 where I have to start a motor and atop it after 30, 60, 120 or 180 minutes based on switch selection.

I have never seen any application that demands such a long interval.

What is the best way to achieve these intervals and what are the pitfalls in making the controller execute such a feat?

Any help will be greatly appreciated.



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Well, I would add a real time clock to it and make it easy. Something like a DS1307.

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