Sensors

Discussion in 'The Projects Forum' started by arivalagan13, Jan 20, 2010.

  1. arivalagan13

    Thread Starter Member

    Apr 30, 2009
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    Hi..I'm designing a mouse for children affected with cerebral palsy.
    They can't move their hands,but can give a force through their body weight to their hand.This(force from hand) should be converted into position(cursor position).I'm going to use strain gauge for this job to move the mouse cursor in the computer screen area...
    But,I'm facing a problem..the problem is I need to simulate the left- and right-click now...i can't use switch because the child can't do that..
    I need to find some mechanism for this by the same time the new sensor system should not disturb the cursor movement...
    can anyone provide me a mechanism of doing this...
    kindly reply to this request.

    Arivu..
     
    Last edited by a moderator: Jan 20, 2010
  2. hgmjr

    Moderator

    Jan 28, 2005
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    Would it be practical to get the individual to use their feet to operate a couple of pedals?

    hgmjr
     
  3. eng1ne

    Member

    Dec 4, 2009
    97
    3
    I would have suggested what hmgjr did and I agree that is a practical solution.

    I asked in another thread why you wanted to know the force exerted on a mouse, purely out of curiosity; I now know.

    I think it's a good idea and wish you the best of luck.
     
  4. arivalagan13

    Thread Starter Member

    Apr 30, 2009
    29
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    Thanks a lot 4 involvement from members..
    but the problem is they can't move their foot also due to the nature of the paralysis..
     
  5. Bernard

    AAC Fanatic!

    Aug 7, 2008
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    Is head movement reliable? Maybe any rotation over 35 degrees +_, with red & green LEDs for visual feed back; one shots to gen. pulses.
     
  6. hgmjr

    Moderator

    Jan 28, 2005
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    You may be able to use a puffer/sucker. This is a small plastic flexible tube that can be sucked or blown into. At the end of the tube is an atmospheric pressure sensor that translates the pressure in the tube into mouse clicks. For example, the individual could blow for left mouse button and suck for right button. The sensitivity could be adjusted to suit the user's strength.

    hgmjr
     
  7. arivalagan13

    Thread Starter Member

    Apr 30, 2009
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    puffer/sucker may be useful for x or y direction..but for movement between x and y direction,it is not possible..if I want to move in a direction between x and y direction I need to suck and puff at simultaneously,which is not possible..and we need to have a cursor movement all over the screen..not only in x or y direction
     
  8. THE_RB

    AAC Fanatic!

    Feb 11, 2008
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    You could try a "sqeeze" sensor on the mouse handle to act as the mouse click. The act of squeezing is different to the downward pressure used to move the mouse, so even with limited movement they could probably separate the two actions.
     
  9. hgmjr

    Moderator

    Jan 28, 2005
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    My suggestion to use the puffer/sucker was not to manage the cursor movement around the screen. Instead, my idea was to use it to simulate the right and left mouse buttons. In the quoted information from your initial post, I understood that you had already solved the screen positioning part of the problem and was interested in suggestions from the forum members of a way to manage the right and left mouse buttons. It is appears from your post above that I misinterpreted your need.

    I still think the sucker/puffer would be a reasonable substitution for the right and left mouse buttons. I would even imagine that it might be possible with a bit of practice to manage the double-click function with a couple of short puffs in quick succession.

    All that said, I defer to you in gauging the limitation of your CP patients.

    I think your project is an interesting one and I wish you total success in its implementation.

    Good Luck,
    hgmjr
     
  10. DC_Kid

    Distinguished Member

    Feb 25, 2008
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    can the force be vector based?
     
  11. THE_RB

    AAC Fanatic!

    Feb 11, 2008
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    Simulating left and right click is a design flaw.

    Assuming the user has limited mobility and lack of control from cerebral palsy I would assume the PC software is properly designed with large control icons and a single-click event.

    The puffer tube is ugle, intrusive and has hygeine and psychological issues. It's a horrible solution best suited for people with extreme loss of mobility where there are no other options.

    I still believe the best system is a 2axis XY push-to move system, with a squeeze to click device on the handle. You could probably implement a double-squeeze to simulat ea double click but really the software should not require it.
     
  12. arivalagan13

    Thread Starter Member

    Apr 30, 2009
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    I feel the the suggestion of using sucker/puffer is reasonable and I will try it out among some other possibilities..

    Thanks,
    Arivu..
     
  13. jeka616

    Active Member

    Jan 14, 2009
    121
    1
    Is it possible to use eye blinks for clicking right/left? I'm sure some simple contacts (or optic ones even) can be made as a glasses?
     
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