I have a single push button switch S1 (like a doorbell), I would like to press S1 one time and after 30 minutes an LED will turn on and off. I do this now with a one-shot timer circuit using a 4093 or a 555 timer. I would like to be able to press S1 2 times and the delay to the LED would be 60 minutes. Or press S1 3 times (in a row) and the delay to LED would be 90 minutes, etc... The output (LED) would go high just momentarily. I need help on how to do this with minimum of parts, the 30 minute time period does not have to be precise, I can use a single R/C. I am clueless on how to store or latch the counts and then add them to the timer, hope someone has an idea, thanks...jr
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