On Saturday 18 January 2003 04:05 pm, you wrote:
> > Ok, this is really strange.  With no code or wiring changes, it just
>
> started
>
> > working....  I was watching the scope and suddenly, all the 0's became
>
> data.
>
> Hmm.  If it is an IIC problem, then it is probably a race condition where
> a little bit of capacitance on one of the lines makes a difference.  I've
> actually seen a case where the capacitance of the scope probe made it
> work.  Otherwise, there is something strange going on inside the slave.
> Does it have to be initialized?  Does it have a reset line or something
> that isn't tied right?

Just to test that, I removed the probes and cycled power.  It still works.  I
wonder if it was just a loose wire on this breadboard...

Just FYI, this is a graphing thermometer.  It takes a reading every 15 minutes
and plots a dot on a 128x64 graphic LCD.

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