Comments on: Dismantling of Future Vision Robot http://zpriddy.com/2009/06/19/dismantling-of-future-vision-robot/ My Life and stuff to go with it Fri, 27 Aug 2010 19:45:26 +0000 hourly 1 http://wordpress.org/?v=3.0.1 By: ZPriddy http://zpriddy.com/2009/06/19/dismantling-of-future-vision-robot/comment-page-1/#comment-513 ZPriddy Fri, 02 Jul 2010 22:25:13 +0000 http://zpriddy.com/?p=104#comment-513 Thanks, When i received the wheel chair the communication and/or motor controller were not working, so the time that i did spend trying to reverse engineer the system was also to see if it might work. And about the motor controller, at the time that i bought 2X25 they did not have the 2X50, so i am hoping that i will be able to get this to work this week. Thanks,

When i received the wheel chair the communication and/or motor controller were not working, so the time that i did spend trying to reverse engineer the system was also to see if it might work. And about the motor controller, at the time that i bought 2X25 they did not have the 2X50, so i am hoping that i will be able to get this to work this week.

]]> By: DMaleche http://zpriddy.com/2009/06/19/dismantling-of-future-vision-robot/comment-page-1/#comment-512 DMaleche Fri, 02 Jul 2010 17:53:30 +0000 http://zpriddy.com/?p=104#comment-512 Great project! Many have tried to 'reverse engineer' wheelchair protocol controller and have not completely succeeded. There is such a stringent safety requirement when it comes to wheelchair control and protocol. Most controllers use the industry approved Multiple Master – Multiple Slave (M3S) protocol (Google M3S). It uses a Controller Area Network (CAN bus) as the network layer which carries the M3S packet which contains control and safety data. Additionally, a ‘Safety’ command is sent at the same time the M3S data command is transmitted to ensure that the operator did in fact produce a movement command via joystick. This is to prevent a rogue/ runaway wheel chair. Most joysticks however are analog and can be emulated with a digital potentiometer IC using SPI or I2C to command the motors. I am working some bugs out to accomplish this with the four wheel chairs I have. You might want to consider using a SaborTooth 2X50 to handle the larger wheelchair motors. I know it’s more money ($250), but able to handle A LOT! Keep up the outstanding work! Great project!
Many have tried to ‘reverse engineer’ wheelchair protocol controller and have not completely succeeded. There is such a stringent safety requirement when it comes to wheelchair control and protocol. Most controllers use the industry approved Multiple Master – Multiple Slave (M3S) protocol (Google M3S). It uses a Controller Area Network (CAN bus) as the network layer which carries the M3S packet which contains control and safety data. Additionally, a ‘Safety’ command is sent at the same time the M3S data command is transmitted to ensure that the operator did in fact produce a movement command via joystick. This is to prevent a rogue/ runaway wheel chair. Most joysticks however are analog and can be emulated with a digital potentiometer IC using SPI or I2C to command the motors. I am working some bugs out to accomplish this with the four wheel chairs I have.

You might want to consider using a SaborTooth 2X50 to handle the larger wheelchair motors. I know it’s more money ($250), but able to handle A LOT!

Keep up the outstanding work!

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