[TriEmbed] Measure voltage

[Scott Hall]

See if this article covers what you want -- you can adapt it to be the
prebuffer before the ADC input:

https://circuitdigest.com/electronic-circuits/simple-battery-level-indicator-using-op-amp

- sgh

On Wed, Aug 16, 2023 at 4:29 PM The MacDougals via TriEmbed <
triembed at triembed.org> wrote:

> I know how to set up a voltage divider with a couple of resistors to
> measure
>
> battery voltage of ~12v on an analog pin that accepts 3.3v.
>
>
>
> But, I really am interested in a small segment of the range, say 9v to 13v.
>
> How would I “zoom” in on that range?  I want to subtract/bias the vbat
>
> by the 9v minimum.  So, 9v -> 0 and 13v -> 3.3.
>
>
>
> ---> Paul
>
>
>
>
>
>
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-- 
Scott G. Hall
Raleigh, NC, USA
scottghall1 at gmail.com
*Although kindness is rarely a job, no matter what you do it's always an
option.*
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