Why not? if the pic must be powered from the ac line without transformer (no
external psu) , and detect  voltage levels via interrupts and comparators,
send pulses to fire triacs and keep a multiplexed display via tmr0
interrupt, and so... i'm really more comfortable with software, but where
trying to figure why the interrupts don't work as i expect, and check if the
hysteresis feed via another port is enought to make the comparator work as i
expect, etc, etc, a scope can show what is not working.

i must confess that i make a special plug without earth, and check what i
want in ten minutes, and fix the problem. I don't know why if i can put the
probes of a ac powered multimeter in the line to check if i have 220V, i
can't put the probes of a 400V oscilloscope, this is a bit extraneous to me.

I understand that this must be done in few cases and taking all the
precautions.

Thanks to all.


RVP.


>
> The reference to mains seems to be a red herring (sic) that has developed
> because he talked about trying to measure the mains with the probe. He
also
> says he has zero experience with scopes, so it would seem this was a
> dangerous blunder of the inexperienced. I have not seen anyone else try
and
> get him back on the right track of debugging his pic circuit with a scope.
>

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