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Amazing timing, I had the same question a few days ago. I knew how to do a 
voltage divider, but I was having problems when connecting the output of a 
voltage divider directly into the PIC's ADC port. Turns out that the PIC was 
"loading" the circuit, according to some experts, and I needed to isolate 
the two circuits (the divider and the ADC). Someone suggested that an opamp 
with unit gain would do this task, since it has a very high input impedance 
and a low impedance output. That's what I did, and it worked fine for 12V. 
When I tested with my 14.4V NiMH batteries, I would still have a small 
offset from what I was reading with the DMM, so I've included the 10K 
resistor in the feedback loop and the measurements were equal again.

Well, I'm in a rush to leave now, so I realize that you might have a hard 
time understanding what I did. If you do, please write again and I'll try to 
clarify...

I've included the schematics of the sample circuit I did. 14.4V is supposed 
to be read as 3.99V


If the list gods see anything wrong in my circuit, please tell me as there 
is still time for fixing.


Cheers

Padu

----- Original Message ----- 
From: "fred jones" <boattow@hotmail.com>
To: <piclist@mit.edu>
Sent: Monday, November 14, 2005 5:08 PM
Subject: [PIC] How to read Battery voltage with PIC


>
> Hi all,
> I'm sure this is an easy question for many of you so I hope I don't get 
> flamed.  I searched but can't find the answer in the archives although I'm 
> sure it must be there somewhere.  This is not my strong point so I thought 
> I'd ask for help.
>
> I am building a device that will run off of a 12V gel cell battery.  It 
> will use a 16F877 PIC powered with a 7805 regulator.  I'd like to be able 
> to read the voltage of the gel cell and display it on the 2X16 LCD 
> display.  I'm sure I can't connect the 12V batter into the A2D of the PIC 
> but I'm not sure what the proper method would be.  Any help is 
> appreciated.
> Thanks for your time,
> FJ
>
>
> -- 
> http://www.piclist.com PIC/SX FAQ & list archive
> View/change your membership options at
> http://mailman.mit.edu/mailman/listinfo/piclist
> 

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