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Hi Sean,
I’ve not been involved in setting up switch access for driving, but Curtiss Wright do recommend using normally closed switches with switch detect set to on to better manage a fault condition (Page 26):
That in itself could involve some modified/bespoke switches I imagine.
Paul
Sent from my iPad
On 1 Nov 2018, at 08:22, LINSKELL, Jeremy (NHS TAYSIDE) <[log in to unmask]> wrote:
Hi Seán
Some people will reply with the definitive answer, but the fact is there isn’t one. It’s about your risk assessment and what you document, as there is no perfect solution. So here is my tuppence worth;
Firstly I would say that I wouldn’t use jelly Bean switches, because they are not water proof and in relation to that is your switch-9 pin interface water proof or at least protected in some way? Also in relation to JB switches I think that you are correct in that the design does make it easy for flotsam to get in between the moving parts and make it likely to stick, so that is a specific problem, but all switches have some potential to be affected by that. This particular problem isn’t helped either by using monitored switches, i.e with a resistance across the input, but that itself could be a problem if for example the mode switch of on/off switch loosened in its socket when trying to cross a road! It all depends on what double fault scenario(s) you are accommodating.
In terms of the Omni, the mode switch also doubles as an emergency stop switch in any case and for extra backup and could also put an additional emergency switch into the on/off input, so those are both contingencies
We don’t do that many 5 switch systems but we fabricate and provide a significant number of 3-switch head arrays and use the standby function rather that a mode switch in general. In terms of switches used, we always use the Pico30 and Pico50 Switches. We used to use the Lever Switches from IT as well, but just didn’t get on that well with them.
Cheers
Jeremy
Jeremy Linskell CEng, CSci, MIPEM
Principal Clinical Scientist
Electronic Assistive Technology Service
Ninewells Hospital
Dundee
Scotland
tel: 01382-496286
fax:01382-496322
Editorial Board Member of Journal of Enabling Technologies
http://www.emeraldgrouppublishing.com/jet.htm
From: A discussion list for Assistive Technology professionals. [mailto:[log in to unmask]] On Behalf Of Sean Loughran
Sent: 31 October 2018 17:59
To: [log in to unmask]
Subject: Switch access for power wheelchairs
Hi,
I'm working with a user who is controlling their power wheelchair with five Jellybean switches one switch for forward, left, right, and backwards and the fifth switch for mode change. The switches are terminated with 3.5 mm plugs. The leads then go to a switch interface that converts to a nine pin D type connector which connects to the Omni controller of the power wheelchair. However I have a concern around the switch sticking in a closed position and the switch manufacturer has stated that their switches should not be used to control a power wheelchair.
What is best practice in this case for somebody who uses five switches?
What switches are people using?
Regards,
Sean.
Seán Loughran
National Assistive Technology Training Service
Enable Ireland,
Sandymount Avenue,
Dublin 4.
Ph: +353 1 2184106
Mobile: 087 1824137
Blog: www.atandme.com
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