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frequency measure

 
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sachin321
Guest
frequency measure
PostPosted: Sun Feb 01, 2009 11:51 pm     Reply with quote
Dear All,
I want to measure frequency of sine wave signal with the PIC 16f877.
I am using CCS compiler. I am converting sine wave into square wave
with the help of optocoupler. That is perfect with the frequency measured
in CRO and digital meter.
But how to measure with the help of this IC and CCS.
Regards
Sachin
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Mon Feb 02, 2009 12:43 am     Reply with quote
See this thread:
http://www.ccsinfo.com/forum/viewtopic.php?t=29963

The input square-wave signal must be at least 4v peak-to-peak,
if the PIC is running at +5v.
sachin321
Guest
frequency measure
PostPosted: Mon Feb 02, 2009 1:32 am     Reply with quote
Thanks a lot.
I have tried this example exfreq.c but it displays frequency like 56, 57 etc. but i have to display like 49.3 , in decimal upto 1 place.
Regards
Sachin
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