AVR-Chat

--- In AVR-Chat@yahoogroups.com, "kc9dag" <dpboyer@d...> wrote:
> Will the keyboard work on +3v, > or can I power the keyboard from
> a +5v source and just use a common ground between the keyboard and
> the butterfly (and if I do it that way, can the AVR's inputs handle
> the +5v while it is running at +3v)???

You'll probably find that the keyboard does need +5V to function.  
However, the clock and data lines are "open collector" and need to 
have pullup resistors.  If you connect the pullups to +3V I would 
think that both the keyboard and the AVR would be happy.