In-Reply-To: <memo.630161@cix.compulink.co.uk>

> Mike Harrison <mike@whitewing.co.uk> has again emailed me about the LED.
> I think he is intending to mail the list but he appeared to be mailing just
> me. Anyway I obviously need to explain more clearly. What I don't understand
> about the LED is why it is wired the way it is with two resistors and two
> pins on the PIC chip. I have already seen how it behaves in practice.

I've just realised that the LED is being used as a voltage reference for the AtoD
on the PIC chip - That's why it's connected to DRA3.

But what is the 100R resistor to DRB2 for?

Does the LED perhaps blink without going right off - just dimming once R5 is
changed to 330R?

The necessary sub min resistors should arrive in the post tomorrow for me to find
out for myself.

Brian Gregory.
briang@cix.co.uk