Re: [Development] Lights functions required

["Dr John Tankard" <john@xxxxxxx>]

--- In ukha_d@y..., "Keith Doxey" <ukha@d...> wrote:
> Pissed I think :-)
>

Not this morning


> what would you use as a reference?
>
> The current would only be known at maximum power. How do you decide
that 90%
> flow is 1 of 10 bulbs blown or lamps running at 90% brightness.

Because I am controling the output, so I take a snapshot at say 10%
on each channel. Then next time i ramp down slowly I measure the
current at 10% if its lower then a bulb's gone, if its zero either
there was only one bulb which has gone or the fuse has gone. If its
higher then the triac has gone closed circuit.

John.

>
> > -----Original Message-----
> > From: Dr John Tankard [mailto:john@xxxxxxx...]
> > Sent: 12 June 2001 22:32
> > To: ukha_d@y...
> > Subject: [ukha_d] Re: [Development] Lights functions required
> >
> >
> > ---
> > > Fault detection.
> > > Subject to having spare pins available on the PIC you can
detect
> > > No Output - fuse or relay blown
> > > Continuous Output - Triac blown
> > > No Load - All lamps disconnected (NOT INDIVIDUAL BULBS
unless 1
> > bulb per
> > > dimmer)
> > >
> > Just had a idea... but perhap i have had one too many to night...
> > Keith we could use a current coil though a anlogue multiplexer
into a
> > analogue port on the pic. At each shutdown i could measure the
> > current in each channel at a low level and compair it, that way i
> > could detect a blown bulb even if there are others on the same
> > channel. Am i good or am i pissed.
> >
> > John
> >
> >
> >
> >
> > ____________________________________
> > Automated Home UK
> > http://www.automatedhome.co.uk
> > ____________________________________
> >
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> >
> >
> >




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