gEDA-user: furnace controller I/O port again

[DJ Delorie]

> > I'll look into it.  The thing about op amps is that they're cheap
> > and tiny.
> 
> Which frequently gets people into trouble when they try to use
> Op-Amps as Comparators:

I don't mind using comparators as long as they're tiny.

You know, if I keep on "just trying stuff" I'll eventually learn
everything, since each time I post an idea I get a bunch of neat stuff
to read about :-)