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Registered Member #190
Joined: Fri Feb 17 2006, 12:00AM
Location:
Posts: 1567
I feel I will be building a timer. Let's say it will count 120 seconds. There will be two timers, with one starting 60 seconds after the other. when it hits 120 it will switch off; when it counts to 120 again it will switch on. what is the best chip for counting? Is it a decade counter? I just need someone to point me in the right direction to save me time; I can do the rest.
Registered Member #3637
Joined: Fri Jan 21 2011, 11:07PM
Location: Buffalo, NY
Posts: 1068
Yeah, probably a 555 timer plus some decade counters. Alternatively, if you need something more accurate you could go with a crystal oscillator, like this
Registered Member #72
Joined: Thu Feb 09 2006, 08:29AM
Location: UK St. Albans
Posts: 1659
4040 and 4060 chips (ye olde 4000 series CMOS) are purpose built for that sort of thing. 4060 has an oscillator section which can use RC, crystal or ceramic resonator, followed by 12 binary stages, 4040 is just a 14 stage counter.
Data sheets
But, wouldn't it be better to get a low cost uC dev board, preferrably one with an LCD display already attached, and program it. Waay cooler, and more flexible.
Registered Member #190
Joined: Fri Feb 17 2006, 12:00AM
Location:
Posts: 1567
Dr. Slack wrote ...
But, wouldn't it be better to get a low cost uC dev board, preferrably one with an LCD display already attached, and program it. Waay cooler, and more flexible.
I have some extra ATMega chips that I could easily program as a counter. I could just count from 0 to X and repeat. I could toggle the first output on X and second on X/2
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building a simple timer
