>Even so, I still cant figuire out why the PIC should not respond to the
>inputs. That too, its not as if the PIC is hopelessly locked and *has* to
>be reset to recover; it would respond to an input (IR or the switch) if
>you try a dozen times!

The pic's code might play an important role (how robust it is wrt
debouncing heavyly jammed inputs). F.ex. I'd start by adding 5nF caps
across each pic input and ground directly at the chip. Troubleshooting
problems like your can be hard. I would try to substitute the old load
(lamp) while leaving the circuit where it is, and the monitor plugged in
next to it, in the *present* wiring configuration. See if it still makes
trouble and if switching the monitor off fixes it.

>I did try the snubber from the URL given by Adam. The values which seemed
>to work were 100 ohms and 0.47 uF. But now, the monitor LED flickers at
>times even when the triac is off, the current being passed on by the
>snubber itself.

Snubbers are not snake oil. It is not very likely that the snubber turns
on anything in the monitor. I use a significantly smaller snubber, maximum
0.047uf + 220ohms. It is much more likely that something else turns on the
triac. Try to remove the pic from its socket and put a jumper in to ground
the triac gate in the socket, see if that fixes the current flickering.

Peter

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