large countdown timer information

ANY Timer Switch
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Brennan Sedivy asked Circuits that add time while countdown is in process?

I'm looking to design a circuit that is capable of counting down the seconds by clicking an input once. One click will set the clock to 30 seconds and count down from there. The difficult part is designing this circuit so that the user could click the input again while it's counting down to add another 30 seconds. The circuit does not need to count down more than 90 seconds. I've taken an AP Digital Electronics course, so I understand the basics of synchronous/asynchronous timers, how to configure them for counting up and down and how to trigger a preset of set values or clear. The difficult part about this circuit is finding a way to ADD time instead of triggering a preset. Are there an unique components or circuit designs that could enable me to make this behave like a microwave (the +1 minute button) timer? Also - I'm exploring the option of making tis a pocket-sized device (after prototyping and such). Is surface-mounting something I can do on my own?

And got the following answer:

Acheiving this goal using discrete logic chips would be extreemly problematic. You would need a large number of chips. 'The easiest way is to use microcontroller, e.g PIC12F629 it has 8 pins. One can be used for push button , one for output that activates when 0 is reached. If you need to connect display you can go with different model that has more output pins, or use serial display.


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