Arduino ADC question...

[Tony Hardie-Bick]

Yup - that's the circuit.

"Synth.Net" <paul.maddox at synth.net> wrote:

>DC level shift is quite easy -
>http://electronicdesign.com/Content/14978/60257_fig_01.gif
>
>Then you just need to halve the gain (10v p-p down to 5v p-p).
>
>I'd replace the pot with two fixed resistors (go for two 0.1% 1K
>resistors in this case), if you have a space ADC input, you could tie
>that to the middle of these two resistors also, and you could read
>that, to check your "zero volt" point, so if it shifted you would
>know.
>
>and yes 5v is fine, modern MCUs will run up to around 5.6v before you
>have a problem.
>If you use this opamp circuit, as shown, off the 5v rail, you'll never
>get more than 5V out of it anyways.
>
>Paul
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