RE: Re: Ceiling Lights & Local Control

["Ian Lowe" <ian@xxxxxxx>]

Dimming might be a problem with Homevision Graham, but given that the
voltage across the transformer should vary with the dimming, using an ADC
and a PIC with some minor smarts,
you should be able to get a digital value without *too* much hassle..

Ian.


-----Original Message-----
From: graham_howe [mailto:graham@xxxxxxx]
Sent: 14 February 2002 17:06
To: ukha_d@xxxxxxx
Subject: [ukha_d] Re: Ceiling Lights & Local Control


--- In ukha_d@y..., "Paul Gordon" <paul_gordon@h...> wrote:
> Is this a "Eureka moment" ?
>
> A quick thought occurs to me regarding getting status reporting
back to a
> controller when fitting LD11's...
>
> I've used one of the current sensors that Comfort sell, and I'd
thought
> about using one of these per controlled light fitting, but thats
daftly
> expensive as the sensors are about £12 a pop.
>
> But, could you not add a cheap mains transformer (e.g. M**lins part
YN12N)on
> the cable between the LD11 & the light fitting, in parallel with
the light,
> then run the secondary (which can be 3/6/9/12/15V) back to an input
on
> HV/Comfort whatever? - then whenever the light is on, the
transformer is on,
> and the input to said controller has the chosen voltage applied to
it...
>
> Keith, feel free to jump in here and embarass me by telling us all
why this
> is a very bad idea and couldn't possibly work!!!
>
>
Surely this might be a problem with dimming? Also, if it did work
then why would there be a need for an additional wire between the
light and the LD11, uf it is to be connected in parallel then
couldn't that be done at the consumer unit connecting directly to the
LD11 terminals. But I do think you might be on to something here, we
need input from an electronics wizard, but there must be some way of
detecting what is being sent out from the LD11 and getting that
information into the controller.

Regards

Graham



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