AVR-Chat

--- In AVR-Chat@yahoogroups.com, "Graham Davies" <Yahoo37849@...> wrote:
>
> --- In AVR-Chat@yahoogroups.com, "u4ia2000" <u4ia2000@> wrote:
> >
> > The Butterfly will read 0 to 5v.
> > My question is can I get to to
> > read 0 to 30v simply or would
> > take a lot of hardware?
> 
> It would take two resistors.  Just make up a voltage divider.  Begin by looking up the schematic of the AVR Butterfly to see what the input resistance of the analog input is.  Take that into account when you calculate the resistors of your voltage divider.  Use 1% tolerance resistors if you need that accuracy.
> 
> Graham.
>
Great thanks, that's all I need-- I'll do that.