The DX system uses spin turn for the switch input systems so you can't do this as you are telling the chair to turn left and right at the same time, which results in it going nowhere.
We developed a little relay board that converts the Dudley pattern inputs into signals suitable for use on the DX system. With two tubes and dual sip/puff switches you can get 6 directions, left and right arc and forwards and backwards. The system also works well for head switches if you put a reverse switch either side of the Left/Right switches.
e.g., (from above) Rev Rev
Left Right
Geoff
G.J. Harbach I.Eng MIED IIPEM
Clinical Technologist
Special Controls Service Manager
Posture and Mobility Services
West Midlands Rehabilitation Centre
91 Oak Tree Lane, Selly Oak
South Birmingham Primary Care NHS Trust
West Midlands.
Tel 0121 627 1627 Ext. 53238
-----Original Message-----
From: p=NHS NATIONAL INT;a=NHS;c=GB;dda:RFC-822=ASSISTECH(a)JISCMAIL.AC.UK;
Sent: Wednesday, September 11, 2002 1:32 PM
To: p=NHS NATIONAL INT;a=NHS;c=GB;dda:RFC-822=ASSISTECH(a)JISCMAIL.AC.UK;
Subject: Re: sip and puff problem
Gary
I'm not sure if it is still produced but the Dudley breath control uses two
tubes, left, right & both for forward. Suck does the reverse.
Having thought for a second, this probably means you need some logic to
convert it to the signals that the DX needs or perhaps the Wisedx or the
click & go could cope. Does anyone know ?
Barry Taylor, Clinical Scientist
Bioengineering Department
Tulley Medical Physics Building, Hull Royal Infirmary
Anlaby Road, Hull HU3 2JZ
Tel 01482 675928, fax 01482 675750
> ----------
> From: Gary Williams[SMTP:[log in to unmask]]
> Reply To: A discussion list for Assistive Technology professionals.
> Sent: 11 September 2002 11:40
> To: [log in to unmask]
> Subject: sip and puff problem
>
> 2 years ago I was involved in the setting up of a DX system on a Balder
> powerchair, the user drives, raises and tilts the chair, and uses an
> environmental control system via. a sip and puff switch with an
> additional buddy button head switch.
> He has used this system successfully, but has one problem. If the chair
> veers to the right when he is traveling forwards he can change from a
> hard blow to a soft blow and back again momentarily to correct the veer,
> but if the chair veers to his left he needs to change from a blow to a
> suck, this causes the chair to stop. Has anyone ever encountered this
> problem? Do you know of a solution?
> I have discussed this with Patrick Callaghan @ D.C.L. but they do not
> have a solution.
>
> Gary Williams
> Rehab. Eng.
> Wirral wheelchair centre
> St. Catherines hospital
> Derby Rd.
> Birkenhead
> Merseyside
> CH41 0LQ
>
> Tel 0151 604 7261
> or 07733 225606
> e-mail [log in to unmask]
>
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