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Can I read analog 9 volts via analog pins?

 
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memoally



Joined: 25 Jan 2010
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Can I read analog 9 volts via analog pins?
PostPosted: Fri Feb 26, 2010 3:20 pm     Reply with quote
Can I read analog 9 volts via analog pins? Should I set Vref high and low values to 9 and 0, respectively ? Also I wonder, if I give 9 volts to an analog pin for adc, would I damage or burn pic ? I use pic 16f876.
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compiler version: 4.105
pic: 16f876
clock frequency: 4MHz
FvM



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PostPosted: Fri Feb 26, 2010 3:57 pm     Reply with quote
Quote:
Also I wonder, if I give 9 volts to an analog pin for adc, would I damage or burn pic ?

Exactly! If you don't need to to know more about the difference between damage and burn, just let it be.
Use a voltage divider to keep the specified PIC voltage rating. You may want to consult the datasheet for details.
memoally



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PostPosted: Fri Feb 26, 2010 4:08 pm     Reply with quote
But I dont want to lose power on voltage divider, because I use a battery and power lost (the power across pot or resistor, whatever) shortens my battery's life. I want to measure a battery of 9 volts. How can I do that?
_________________
compiler version: 4.105
pic: 16f876
clock frequency: 4MHz
PCM programmer



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PostPosted: Fri Feb 26, 2010 4:14 pm     Reply with quote
Now that you have told us what your purpose is, we can give you some
links to articles in the forum archives for measuring battery voltage:

How to design low battery indicator (3 pages):
http://www.ccsinfo.com/forum/viewtopic.php?t=24560

Checking a battery voltage with A/D:
http://www.ccsinfo.com/forum/viewtopic.php?t=24842

Newbee - battery level:
http://www.ccsinfo.com/forum/viewtopic.php?t=23186

If you have any questions, post them here in this thread.
(Not in the threads above).
memoally



Joined: 25 Jan 2010
Posts: 35

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PostPosted: Fri Feb 26, 2010 4:45 pm     Reply with quote
Thank you pcm programmer, if I can't understand any point, I will ask it from here.
_________________
compiler version: 4.105
pic: 16f876
clock frequency: 4MHz
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