I have a suspicion that Andrew Wood has long gone.

Andrew, are you still receiving. Over.


On 24 May 2010 19:18, Michael Watterson <mike@radioway.org> wrote:

> sergio masci wrote:
> > On Mon, 24 May 2010, Russell McMahon wrote:
> >
> >
> >
> > Hmm, now there's a thought! Build a small unit that looks after N lines
> > and talks to the PC via USB. If you can get N down to 45, build two
> > identical units with different USB addresses, get them to look after
> their
> > own block of lines and let the PC sort out the rest. You could even
> reduce
> > N to a much (DIP PIC) friendlier number and use more units. I don't know
> > much about USB, how easy would it be to have several PICs sharing one USB
> > socket? Of course all this is assuming that the project is just a one
> off.
> >
> > Anyway I still prefer the "wide" shift register solution.
> >
> > Regards
> > Sergio Masci
> >
> Bad idea. You have multiple USB devices.
> To use same socket you need a hub. More expense.
> It's trivial to have say HW TTL USART between the PICs and one with USB.
> but one PIC with shift registers or switches or buffers is best unless a
> space issue.
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