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Subject: Designing a counter to send one pulse for every 25 it recieves?

Date: 03/28/01 at 5:19 PM
Posted by: Kirk Lane
E-mail: snake64@yahoo.com
Message Posted:

I need to make a circuit that will do the following. It needs to be able to recieve pulses from a photodiode or some other optical sensor whenever it 'sees' a white dot on a black wheel go by (measuring RPM). I then need it to be able to send one pulse out for every 25 it recieves. The way I intend to do so is to use a pair of binary ripple counters to count from 0 to 4 over and over. The signal goes in and advances the counter until the counter reaches 4. The outputs (One quesiton, exactly how does it output its data? Binary by turning some pins on and off?) would then be wired to transistors in series so that when it outputs a 4, it sends a pulse to a second counter and also one to the reset of itself, sending it back to 0. The second counter is wired similarly, so that when it outputs a 4, it sends a pulse out to the recieving device and resets itself as well.

Are there any resources on the net that go into detail on wiring up binary ripple counters? I can find data sheets but I honestly can't make much sense out of them, not knowing much of the notation and terminology - little 3 letter labels on a pinout diagram are nearly useless to me.


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