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human pulse counting BPM

 
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human pulse counting BPM
PostPosted: Tue Feb 02, 2010 5:30 am     Reply with quote
Can anyone help me in writing a code that counts a digital signal from 50 to 180 pulses per minute.
PCM programmer



Joined: 06 Sep 2003
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PostPosted: Tue Feb 02, 2010 1:34 pm     Reply with quote
There is tachometer code on this page, for low frequency signals.
See the code posted by Macas, and the changes that I indicate:
http://www.ccsinfo.com/forum/viewtopic.php?t=33153&start=45
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PostPosted: Wed Feb 03, 2010 6:03 am     Reply with quote
I don't have 18f2580 but I have 16f877 I tried the codes in the above link but it doesn't work. Can you advise please.
PCM programmer



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PostPosted: Wed Feb 03, 2010 10:59 am     Reply with quote
1. What is the frequency of the input signal to the CCP1 pin on PIC ?
2. Are you sure that you have the signal connected to the CCP1 pin ?
3. Do you have a ground connection between the signal source and the PIC ?
4. What are the high and low voltage levels of the signal ?
5. Is the signal a digital rectangular waveform, or is it an analog sinewave ?
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