millivolt meter

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jecstl

New Member
trying to make a permanent display off a high variable 2 wire resistor

if i connect a voltmeter from 12 volt + to resistor and resistor to ground

i get the results i am looking for but its millivolts. would like to connect to a

pic micro controller to process info and display any circuits out there
 
Then use an opamp to buffer and amplify it - my tutorials include suitable circuits and software.
 
went to site looks great lots of info was having hard time finding the
electrical circuit diagram to do this saw the programs? did i just miss this

again great site
 
jecstl said:
went to site looks great lots of info was having hard time finding the
electrical circuit diagram to do this saw the programs? did i just miss this
Click to expand...

Look under hardware, top entry of the table.
 
hi jcstl,

You way you describe your connections is a little confusing.

if i connect a voltmeter from 12 volt + to resistor and resistor to ground

Is the meter in series with resistor.?

Do you have a sketch you could post.?
 
ericgibbs said:
hi jcstl,

You way you describe your connections is a little confusing.

if i connect a voltmeter from 12 volt + to resistor and resistor to ground

Is the meter in series with resistor.?
Click to expand...

I presumed he meant a potential divider?.
 
yes the voltmeter is in series with the resistor which is set for volts and gives a millivolt reading wich i want to tie into a pic
connection + volts to voltmeter gnd to one lead of resistor
other lead of resistor to com term of voltmeter
 
hi
The way you have now described your circuit is in the drawing.
You will not get the meter reading you stated, measuring mVolts.
 
Last edited:
hi jecstl

This is one way to connect +12V, using a resistor divider, into a PIC, which
only accepts a maximum of +5Volts.

It may give you an idea.
 
Last edited:
great input

the party about the volt meter was correct don't know what i was reading but not
millivolt the comment about a voltage divider looks good just don't know where my resistor fits in the circuit you guys are sharp thats for sure
 
Last edited:
hi,
Give us some details of your 'resistor' and what you want to do.

Sure someone can advise you
 
really unsure of that one its a oxygen sensor for a car trying to set up a display not sure what type of reading it gives cant really find any info on breaking this down therefore my post has to be some sort of variable

have appreciated the inputs don't know where to seek additional help
that amplifier circuit looks good but not sure i can develop seems to be for a specific trainer.
 
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