On Thu, 12 Jun 2003, =C1lvaro Deibe D=EDaz wrote:

> I suspect that a collision between packets in the RS485 is related with
> the resets, but I can not track it.

I'd check more carefully for transient voltage droops/spikes while lights
are being switched on, especially if the two PICs share a common ground
but are at opposite ends of a long cable.  ESPECIALLY if you are doing an=
y
kind of dimming of the lights, using PWM for example.

When testing my yard light timer, I had a really slick little PWM ramp-up
to full power to bring the lights from full off to full ON over about 1
second.  Really nice looking soft-start, worked great on the bench.  But
with 100' of wiring and a bunch of lamps attached, the spikes caused by
the inductance of the cable made a real mess of things.  As soon as the
PWM started the PIC would reset - wake up, start the PWM again, reset -
you get the picture.  Now I just turn on one half of a rectifier at a
time, aout half a second apart for a similar effect (but not as cool).

Dale
--=20
It's a thankless job, but I've got a lot of Karma to burn off.
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