Would a pushbutton toggle switch be too easy?  Digi-key sells them.

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> From: Dave Johnson <djohnson@SIRIUS.COM>
> To: PICLIST@MITVMA.MIT.EDU
> Subject: [OT] Pushbutton toggle
> Date: Wednesday, October 28, 1998 9:06 AM
>
> Brace yourself for a newbie electronics question:
>
> I need to make a push button "toggle": push goes high, next push goes
> low, and so on. In effect I need to "store" button presses: the PIC will
> be polling for them, but I can't use interrupts and can't guarantee the
> polling frequency. The button is a N.O. one, SPST. I also need to
> debounce, of course.
>
> I know I can get this with some cross-coupled gates (for debounce) and a
> flip flop (divide by two, basically) but I'm hoping there's a simpler
> (read: fewer components) way to do this. Are there ICs with this sort of
> function? Or some other cool way to pull (push?) this off?
>
> Thanks,
>
> Dave Johnson