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bmkgaa
Joined: 21 Jan 2009
Posts: 2
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| measurement of pulsating dc using pic |
 Posted: Wed Jan 21, 2009 11:06 pm |
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I want to measure pulsating dc using pic 16f877a.
Can anyone suggest a program for this ?
Thanks in advance. |
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Guest
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| Re: measurement of pulsating dc using pic |
| Posted: Thu Jan 22, 2009 6:55 am |
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| bmkgaa wrote: | I want to measure pulsating dc using pic 16f877a.
Can anyone suggest a program for this ?
Thanks in advance. |
What do you want to measure about the pulsating dc? The pulse width? The frequency of the pulsations? The duty-cycle? |
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SherpaDoug
Joined: 07 Sep 2003
Posts: 1640
Location: Cape Cod Mass USA
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| Posted: Thu Jan 22, 2009 9:26 am |
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You will probably want to synchronize your measurements with the pulses. Can you turn the pulses into a TTL signal so the PIC (which PIC do you have in mind?) can trigger on it?
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The search for better is endless. Instead simply find very good and get the job done. |
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bmkgaa
Joined: 21 Jan 2009
Posts: 2
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| measurement of pulsating dc |
| Posted: Thu Jan 22, 2009 10:26 pm |
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I am sorry, I want to measure the amplitude of pulsating dc.
thanks |
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RLScott
Joined: 10 Jul 2007
Posts: 465
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| Re: measurement of pulsating dc |
| Posted: Fri Jan 23, 2009 6:42 am |
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| bmkgaa wrote: | | ...I want to measure the amplitude of pulsating dc... |
Then you will want to use the A/D converter. Hopefully the voltage range of the pulsating DC is less than the Vdd of the PIC. If not, then you will have to divide it down with a resistive voltage divider. Then there is the issue of the duration of the pulses. If they are long enough, then you can just read the A/D converter over and over again, watching for a maximum value. If the duration is too short for that, then you may have to build a peak-detector circuit ahead of the A/D to capture the peak value.
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Robert Scott
Real-Time Specialties
Embedded Systems Consulting |
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