I use a brand of PLC that has a graphical IDE (Sort of like PSOC express) with logic gates and timers. You can download a demo from http://www.crouzet-usa.com/downloads/millenium/Demo132.exe It is similar to yhe system Marcel described.

The demo is only limited in that it can't upload the program to the PLC. 

-------------------------------------------------------------------------------------------------------------

James,
I personally liked the content (though I was also unable to access the
Java applets). But I think some sort of application might be good,
too.
At the Tech museum in San Jose, CA they have a setup with a bunch of
jacks and jumper cables, where on the left side you have things like
"door open", "key turned", etc., and on the right you have "engine
running", "radio on", "lights on", and so forth. And in the middle of
the board there are all sorts of logic blocks (some AND gates, some
NOT, etc.) so that you can link actions (turning the key) to results
(engine is on). It was a neat way to make it applicable.
While your examples are definitely good, they need a kid to already be
excited about the subject.
Of course I'm not suggesting that you use the same setup as above, but
at least illustrating some cases where you might want to make an
output depend on some inputs might be useful.
Regards,
- Marcel

On 8/25/07, James Newtons Massmind <jamesnewton@massmind.org> wrote:
> I'll look into that.
>
> Any feedback on the content at
> http://techref.massmind.org/techref/logic/nand.htm 
> And the following pages in the tutorial?
>
>
> ---
> James.
>
>
>
> > -----Original Message-----
> > From: piclist-bounces@mit.edu 
> > [mailto:piclist-bounces@mit.edu] On Behalf Of Roger, in Bangkok
> > Sent: 2007 Aug 24, Fri 23:05
> > To: Microcontroller discussion list - Public.
> > Subject: Re: [EE] A tutorial: digital logic to uC's
> >
> > It works great for me on an older version of Java as well.
> >
> > However, a bit more unsettling is that McAfee's SiteAdvisor
> > flags the site as yellow.  Normally that would have stopped
> > me going any farther, but there is of course special
> > dispensation for PICy people :-)  McAfee's complaint is ...
> > [image: Yellow Verdict Image]
> >
> > When we signed up here, this site posted our e-mail address
> > on the Web, making it available to spammers.
> >
> > Are you the owner of this site? Leave a
> > comment<http://user.siteadvisor.com/forums/websiteOwnerVerific 
> > ation.php>
> >  - - - - - - - - - - - - - - - - - -
> >
> > It would be a good idea to check and verify/correct the
> > situation, and then go to SiteAdvisor.com, enter your URL and
> > then click the owner's link to enter your comments.
> >
> > Regards/Roger, in Bangkok
> >
> >
> > On 8/25/07, Jinx <joecolquitt@clear.net.nz> wrote:
> > >
> > >
> > > > I'd like some feedback on the first page:
> > > > http://techref.massmind.org/techref/logic/nand.htm 
> > >
> > > Unfortunately I get a red X in the grey box where the sim
> > should be.
> > > Do I need to d/l anything ? AFAIK my Java is reasonably up- to-date
> > > (I've not noticed any problems, put it that way)



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