gcebiker wrote:http://www.wheelchairdriver.com/board/viewtopic.php?f=2&t=6503&start=300#p140043
woodygb wrote:Here is the original.
download/file.php?id=6786&mode=view
viewtopic.php?f=2&t=4867&p=105227#p105228
woodygb wrote:The components that you have should be fine.
You can just cut your existing cable and use that... inside it has two large 24v power cables ( Red and Black ) plus the yellow and blue of the RS482 connections.
Here is one that I made with a relay....this gave me a choice of just the joystick with the relay OFF /closed or Radio Control with the relay powered / ON
woodygb wrote:You can try...but I'm not sure if it is very well documented.
The relay is connected via a transistor to a pin on the Arduino ... this pin is coded to go "high" in response to a R/C signal and " turns on " the transistor which in turn activates the relay.
Did you understand any of that?
Max71 wrote:http://datasheetz.com/data/Switches/Slide/25146NLDB-datasheetz.html
Woody, do you think this could go?
Max71 wrote:Hi woody, I'm developing an app that can work as a command emulator for a motorized system. My aim is to make a wheelchair (of my mother) move independently in the home environment, as it is experiencing a period of great depression due to the impossibility of moving independently. The house is small and moving is difficult even for a young person, let alone an elderly person with reduced vision. <SNIP>
Massimo
woodygb wrote:Max71 wrote:http://datasheetz.com/data/Switches/Slide/25146NLDB-datasheetz.html
Woody, do you think this could go?
Yes ..that looks fine.
ex-Gooserider wrote:Max71 wrote:Hi woody, I'm developing an app that can work as a command emulator for a motorized system. My aim is to make a wheelchair (of my mother) move independently in the home environment, as it is experiencing a period of great depression due to the impossibility of moving independently. The house is small and moving is difficult even for a young person, let alone an elderly person with reduced vision. <SNIP>
Massimo
While not directly related to how to do your project, the above bit makes me feel rather concerned - it is generally not considered safe or wise to do radio or other remote control / autonomous stuff with an OCCUPIED power chair, UNLESS the occupant has the mental and physical ability to at least trigger an emergency stop if something goes wrong - the factory control systems are designed and heavily tested to be both 'Fail-safe' and 'Safe-Fail' in that they are unlikely to fail, and if they do the chair stops moving (Generally the safest option)... Radio signals can be disrupted, and not all of our designs have been torture tested to ensure 'Safe-Fail' operation.... Driving your mother through a wall if something goes wrong is likely to leave her with worse problems than just depression... BE CAREFUL!
ex-Gooserider
Irving wrote:@max71 While I applaud your thinking and determination this isn't something easily done. A colleague of mine runs a research project involving teams from UK and France looking at 'shared control' systems for wheelchairs - think of it like riding a horse; you tell it which way, it does the job of (mostly) avoiding obstacles etc. The problems and challenges are non-trivial - even getting obstacle detection to work reliably in a home environment with varying hard and soft surfaces/material etc is a challenge; what works well to avoid walls and steer down a 1.5m+ wide corridor is all but useless to steer through a 1m gap between a sofa and a coffee table for example. And they've tried everything from simple ultrasonics, laser scanners, lidar, millimetric radar, machine vision, etc, etc. No one sensor technology works reliably in all environments.
But don't let that stop you... maybe you'll be the one to crack it!
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