Issac,
     You are correct on all counts. But I wanted to do it this way. I=20
like the way that LEDs look. They are bright and easy to read. I found a=20
site that showed how to use a PIC to give you the three signals that you=20
need to gate the signal, latch the results, and then to reset the=20
counters and take in the next reading. I lost track of the site and I=20
have been trying to find it again. I thought that I had found it through=20
the PIC List but argh! Nope, I can't find it.
     I have no problem using the PIC to massage the signals but I have=20
already built the display board with CD4511 BCD to 7 segment driver=20
decoders. All of the schemes that I have found that use LEDs are using a=20
multiplexing setup which would require a complete redo of the display=20
board. That would entail a lot of additional work to accomplish this.=20
The 4511s will accept BCD data and I have what I need to program and=20
test PICs but I am still lacking in the skills to do the job with out help.
     I really only need to come up with the gating circuit to control=20
the incoming signal, control the latches, and to do the resetting.
Thanks,
rich!

On 6/23/2014 7:22 PM, Isaac Marino Bavaresco wrote:
> Em 23/06/2014 20:32, Richard R. Pope escreveu:
>>   I am kind of
>> committed because I have already built the display board with the CD4511
>> driver chips.
>
> Oh my God! Are we back to the 80's?
> Are you saying you designed all your circuit around basic logic ICs?
>
> It is much simpler to design a frequency counter with a microcontroller.
> Depending on your maximum frequency the MCU alone may be enough (a
> PIC16F can be used up to some MHz, PIC24 and PIC32 up to some tens of MHz=
).
> With a high-speed CMOS counter as a pre-scaler you can go up to a few
> hundreds of MHz (a 74VHC4040 can count up to 210MHz and divides by 4096,
> other HC devices reach 100MHz).
>
> Using just the divider stage of a PLL IC you can go up to several GHz
> easily.
>
> Isaac
>

--=20
http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.