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How to measure a duty cycle (on-off ratio) of a unknown freq

 
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40inD



Joined: 30 Jul 2007
Posts: 112
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How to measure a duty cycle (on-off ratio) of a unknown freq
PostPosted: Fri Sep 19, 2008 9:35 am     Reply with quote
How to measure a duty cycle (on-off ratio) of a unknown frequency? (Frequency is lower than 10 kHz). I know how to do this with 18Fxx31 series (with hardware period and pulse width measurement), but how to do this with common pic with CCP?
RLScott



Joined: 10 Jul 2007
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Re: How to measure a duty cycle (on-off ratio) of a unknown
PostPosted: Fri Sep 19, 2008 11:06 am     Reply with quote
Use Input Capture mode. Configure for rising edge capture. As soon as you get a capture event, store the captured timer value (PR register) and re-configure for falling edge capture, etc. Subtracting consecutive captured times will give you the periods (on-time and off-time).
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ferdem



Joined: 27 Aug 2008
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PostPosted: Tue Sep 30, 2008 12:33 am     Reply with quote
CCP and ECCP Tips 'n Tricks:
http://www.garcia-cuervo.com/picmania.garcia-cuervo.net/recursos/RedPicTutorials/Trucos%20Tecnicas%20Ideas/PICmicro%20CCP%20and%20ECCP%20Tips_n_Tricks.pdf
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