mA to V
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Posts: 46,084
For Chris
Run the current through a 1.2K resistor to ground and take the voltage
across the resistor to the ADC.
Sid
Run the current through a 1.2K resistor to ground and take the voltage
across the resistor to the ADC.
Sid
Comments
controller to a voltage that I can input to an ADC? I once thought I had
found a single chip solution, but, of course-now that I need it....
Chris
throughout the entire current range....Am I missing something here?
>
Original Message
> From: Newzed@a... [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=PQymPnxiOmJ4rf0llEggOzesQ22QufzvhSfsGbAsgH_xIAIuBuSNjzmn8rnS9hrGD33pzQ]Newzed@a...[/url
> Sent: Monday, August 20, 2001 3:02 PM
> To: basicstamps@yahoogroups.com
> Subject: Re: [noparse][[/noparse]basicstamps] mA to V
>
>
> For Chris
>
> Run the current through a 1.2K resistor to ground and take
> the voltage
> across the resistor to the ADC.
>
> Sid
>
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>controller to a voltage that I can input to an ADC? I once thought I had
>found a single chip solution, but, of course-now that I need it....
Put the controller output through a resistor and read the developed voltage.
Decide
what voltage you'd like to see at 20 ma and divide it by 20 ma. This will
give you the
resistor value that you need.
Carl
Original Message
> From: Chris Loiacono [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=NMJw2A3fd0bMRcW3daGSRiIl9l-Dc7KC9mwFASWnELdxZcG6C0MLsJzDlI9j7ekD57-lGfjGMik]chris@m...[/url
> Sent: Monday, August 20, 2001 10:05 PM
> To: 'basicstamps@yahoogroups.com'
> Subject: RE: [noparse][[/noparse]basicstamps] mA to V
>
>
> Thanks for the idea, however regardless of the resistance,
> these controllers maintain a steady voltage source from the
> minimum to the maximum current output.
>
> Chris
>
> >
Original Message
> > From: carl@g... [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=O7lECzyxHkwSopYS-o8UXw4WBDCdtj057KpaTzCfa1c9oPaZtrkU7AU0c4v42r9iVq4Fdwdk]carl@g...[/url
> > Sent: Monday, August 20, 2001 6:38 PM
> > To: basicstamps@yahoogroups.com
> > Subject: Re: [noparse][[/noparse]basicstamps] mA to V
> >
> >
> > >Does anyone have a reasonable way to convert a 4-20 mA
> > output from a process
> > >controller to a voltage that I can input to an ADC? I once
> > thought I had
> > >found a single chip solution, but, of course-now that I need it....
> >
> > Put the controller output through a resistor and read the
> > developed voltage.
> > Decide
> > what voltage you'd like to see at 20 ma and divide it by 20
> > ma. This will
> > give you the
> > resistor value that you need.
> >
> > Carl
> >
> >
> > To UNSUBSCRIBE, just send mail to:
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> > from the same email address that you subscribed. Text in the
> > Subject and Body of the message will be ignored.
> >
> >
> > Your use of Yahoo! Groups is subject to
> > http://docs.yahoo.com/info/terms/
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> >
>
>>
>> Thanks for the idea, however regardless of the resistance,
>> these controllers maintain a steady voltage source from the
>> minimum to the maximum current output.
>>
That's why you measure the voltage across the resistor.