How to measure voltage between two points using PIC ADC?

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engr.waqas

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I want to measure voltage between two points using PIC microcontroller ADC .The problem is that PIC will always measure voltage with respect to its own ground while i want to measure with respect to another point .How can i do this?
 

Re: PIC ADC problem

Measure U1 with one pin, then measure U2 with another pin and perform calculation in PIC: U1 - U2 or U2-U1, dependig which way do you want/need it ..

IanP
 

Re: PIC ADC problem

engr.waqas said:
Are you serious?will it work always?
Click to expand...
I'm serious, it will work ..

Another option is to use an opamp, say gain=1, and convert differential voltage to single-ended, connect the Opamp to PIC’s ADC and measure the voltage between two pints that way ..

But, I can't see any reason why the first option couldn't work ..

IanP
 

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    engr.waqas

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Re: PIC ADC problem

hmmm ok thanks for your reply ...i am checking 1st option and then will inform you the results

Added after 25 minutes:

Thanks a lot...it really worked for me......
 

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