Arduino ADC question...

[James Coplin]

What do you think about the 5v range?  Is it OK to push the max of the
analog inputs after shifting/attenuating or is there a "better" lower
upper voltage to shoot for?  Thanks!

James R. Coplin

-----Original Message-----
From: music-bar-bounces at lists.music-bar.org
[mailto:music-bar-bounces at lists.music-bar.org] On Behalf Of Tony
Hardie-Bick
Sent: Tuesday, October 18, 2011 9:37 AM
To: Music-bar
Subject: Re: Arduino ADC question...

http://www.ecircuitcenter.com/circuits/opsum/opsum.htm

one of the inputs will be a high reference voltage, the other the bipolar
CV, choose the resistors so you shift the lowest output to 0V, and if
necessary add some gain to get the desired signal range.

Put the equations (with separate resistor values for each input) into a
spreadsheet and tweak :) Keep in mind the gain will be affected by CV
output impedance unless you buffer it.

Tony (HB)

On 18/10/11 16:28, James Coplin wrote:
> Thanks Jay, those will be useful in the future.  However, I'm not
> attempting to output CV, I'm attempting to read an input CV with a
> negative component.
>
> James R. Coplin
>
>
> -----Original Message-----
> From: music-bar-bounces at lists.music-bar.org
> [mailto:music-bar-bounces at lists.music-bar.org] On Behalf Of Jay
> Vaughan
> Sent: Tuesday, October 18, 2011 9:09 AM
> To: Music-bar
> Subject: Re: Arduino ADC question...
>
>> I'd ask since I'm not getting a satisfactory answer on the Arduino
>> forums or elsewhere.
>
> Some links about how to do it here:
>
> http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1169703529/all
>
> And here is a nice schematic:
>
> http://tomscarff.tripod.com/cv2midi/cv2midct.gif
>
> Look at the yellow section ..
>
>
> ;
> --
> Jay Vaughan
>
>
>
>
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