Re: Re: Probe Hub Update

["Harry Hendriks" <hja_hendriks@xxxxxxx>]

Hi all

I have a similar configuration in my home with Homevision (HV) as the=20
controller, possibly of interest.
The 1st floor ligth goes to a presetted dim level (a%)  at about sunset
tim=
e=20
. A PIR motion detector (conected to HV) detects any movement (f.i. bath=20
room visits) during the nigth  and as a consequence HV switches the
ligth=20
(x10) to a disired brigthness  level (b%). After about one minute HV=20
automatically switches back to dim level (a%), if no subsequent movement
is=
=20
detected (otherwise it remains at b%).
If accidently the LD11 switch is used during the nigth for 'off', the
ligth=
=20
comes automatically back again, based on the any (later) motion detected.
In the morning HV switches the ligth to 'off' at a presetted time.
Our experience: nobody uses the switch  during the nigth, bacause it
does=20
not ad any value.
Harry Hendriks


>From: "Graham Howe" <graham@xxxxxxx>
>Reply-To: ukha_d@xxxxxxx
>To: ukha_d@xxxxxxx
>Subject: [ukha_d] Re: Probe Hub Update
>Date: Tue, 14 Oct 2003 09:38:15 -0000
>
>--- In ukha_d@xxxxxxx, Frank Mc Alinden <fmcalind@b...> wrote:
> > Hi Steve
> >
> >             Didnt explain that too good ...What i meant was that
it
>would monitor the "Actions"of the momentry switch.. ie 0% or
100% but
>not % brightness....Doesnt homevision keep track of each load ???
> > Frank
>
>Like I said, this approach won't be much use with momentary switches
>as several can connect to a single LD11. Also momentary contact acts
>as a toggle, so if HomeVision or Comfort or a timer or anything else
>changes the state of a light, then knowing that someone has
>subsequently pressed the switch will be of very little use.
>HomeVision does keep track of what it thinks the state of each module
>is, but this (in a European environment) is based purely on the
>commands passed through HV. It has no way of actually determining the
>load or status of a module here.
>
>As an example of how messy this could get, consider the following
>scenario based upon one of my lights:
>
>1. Following a power cut HV comes back to life and knows to set the
>light to OFF. - Light now at 0%
>2. Someone presses and releases the single momentary switch. - Light
>now at 100%, HV thinks it is at 0%, assume a probe detected the press
>and that HV now has the light at 100%.
>3. HV dims the light as part of the bedtime macro. Light now at 25%
>and HV has the light at 25%.
>4. Some one gets up during the night, Comfort detects the movement
>and brightens the light to 50%. Light now at 50%, HV has it at 25%
>(unless HV has detected the x10 traffic, but I haven't actually tried
>this).
>5. Person returns to bed and dims the light to approximately 25%
>using a momentary switch. Light now at 25%, HV receiving a button
>press from the probe toggles the status to 0%.
>6. In the morning someone presses the button to turn off the light.
>Light now at 0%, HV receiving the button press from the probe shows
>the light at either 25% (the last ON level) or 100%.
>
>In the space of a routine night, HV now has the wrong status of the
>light even with a sigle button and every action being captured
>correctly. Once you start to mix in multiple switches and other x10
>traffic and the potential of HV not noticing and x10 command then I
>can't see much chance of HV knowing the real status without measuring
>the output.
>
>Of course one alternative approach is to have the momentary switches
>wired back to HV or some other controller rather than directly to the
>LD11s. That way the LD11s can be controlled via the controller and
>the controller will always know the status. However this makes
>subsequent removal of x10 significantly more difficult, means that
>lights are 'at the mercy' of the controller and in the case of HV
>would severely limit the number of zones available as it only has a
>few ports.
>
>Of course if any of you electronic wizards want to prove me wrong
>then please do, I will be the first to hand over my cash for HV to
>genuinely know what status all my LD11s really have.
>
>
>
>UKHA 2004: 15th and 16th May 2004
>
>http://www.automatedhome.co.uk
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>

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