AVR-Chat

--- In AVR-Chat@yahoogroups.com, "David VanHorn" <microbrix@...> wrote:
>
> > You'll most likely have to use a voltage divider to ensure that your
> > analog input voltages remain below the maximum level.
> 
> You can also use an op-amp to subtract X volts from the input signal,
> if you do that properly.  Op-Amps were originally intended as building
> blocks for analog computers, afterall.   Another way, less precise, is
> to put a zener in series with the voltage, useful for measuring the
> automotive range, typically 9-14V. A 9.1V 1% zener shaves that down to
> 0-5V with small error, and preserves resolution across the range.
>

Thanks for the op amp tip.  Steve