Hi
Yes the zigbee is an interesting one. I seem to remember that someone, I
think it might be Toby Churchill, have designed zigbee upgradability into
their device? Like Simon I would be interested to seeing some more formal
info on your system James? Zigbee does offer an interesting possibility for
developing more intelligent and interactive controllers in the future.
Incidentally James although Gewa relays are incredibly expensive they are
very effective, especially when used with Gewa transmitters and the
combination can operate without problem in bright sunlight.
Regarding alternatives to spending the cost of a hi-spec controller on
automatic door access, my preference for cost effectiveness is to centrally
wire to an SRS Universal Interface Module, which is a 7-way RF relay module.
The reason that I can't do it in this situation is the patient has been
referred from a specialist centre from another region, and their health
status is still evolving, so until they arrive and I get a chance to assess,
I cannot commit to an Intellec or Lite; so I need the flexibility of IR. We
are just in the process of having such a set up installed for someone with 3
sets of automatic lift doors - where an extended IR receiver for the other
side of the door wouldn't quite work!!
Regarding your situation Simon, as you say this is often the lesser of 2
evils, except.. I have found over the years that the main issue here is not
for the client but the carers, especially if they only visit for short
periods of care and they find the doors interfering with their routines.
This often lads them jamming open, or turning off the doors, and often
'forgetting' to undo this before leaving!
Cheers
Jeremy
Jeremy Linskell CEng, CSci, MIPEM
Principal Clinical Scientist
Electronic Assistive Technology Service
Ninewells Hospital
NHS Tayside
tel: 01382-496286
fax:01382-496322
Editorial Board Member of Journal of Assistive Technologies
http://pierprofessional.metapress.com/content/121393
> -----Original Message-----
> From: A discussion list for Assistive Technology professionals.
> [mailto:[log in to unmask]] On Behalf Of Judge Simon (BARNSLEY
> HOSPITAL NHS FOUNDATION TRUST)
> Sent: 04 February 2011 16:18
> To: [log in to unmask]
> Subject: Re: IR receivers?
>
> Hi James,
>
> That is great to hear. Is there anywhere you have published details about
> your approach to this? Been keeping an eye on zigbee for a while but not
> seen it used in anger in AT yet...
>
> Interestingly we had exactly the same situation last week. In the end we
> went for automatic door openers as we decided that it would be more
> annoying to have to signal each door (i.e. scan to it, or in this case
> voice control it) to get through than simply drive up to it. However we
> decided that it may be that a minority of doors (e.g. bedroom) may have
> receivers added to them once my client had lived there and worked out how
> he used the space.
>
> The tricky thing with this is that where doors are nearby they will both
> open when driving up to them, but this isn't such a biggie.
>
> The other reason was the same as you quote Jeremy - i.e. the ridiculous
> cost of 5 GEWA IR receivers.
>
> Be interested if this tallies with other people's approaches.
>
> Cheers
>
> Simon
>
> -----Original Message-----
> From: A discussion list for Assistive Technology professionals.
> [mailto:[log in to unmask]] On Behalf Of James Dean
> Sent: Friday, February 04, 2011 12:39 PM
> To: [log in to unmask]
> Subject: Re: IR receivers?
>
> Hi Folks,
>
> We decided a while ago that infra red signaling for door controls was not
> a satisfactory approach. Our reasons are:
>
> * Line of sight - you have to have the transmitter within a visible
> range of the door receiver
> * Multiple sensors needed - due to the line of sight limitations, IR
> sensors have to be installed on each side of the door
> * Susceptible to interference - have you used an IR device in full
> sunlight?!?
>
> Our approach has been to build a door control system based on Zigbee
> wireless technology and our own programming. We can address many doors,
> and it they can be opened from a reasonable distance. Our door control
> system also gives clients a real time choice of hold open or auto timed
> close, and also integrates with local push buttons and proximity sensors
> if required.
>
> The client remote can be a multi button unit, a single switch system with
> auditory scanning. (One beep is front door, two beeps is back door..), or
> a custom design. Multiple remotes are also OK.
>
> We've set up several clients in Eastern Australia, and the feedback has
> been good. Happy to chat about your specific client's requirements.
>
> Cheers,
> James Dean
>
> ([log in to unmask])
> Technical Solutions Australia P/L
> Phone (03) 9737 9000
> Fax (03) 9737 9111
>
> www.tecsol.com.au <http://www.tecsol.com.au/> .
>
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