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Computer mouse ??

Discussion in 'Electronic Design' started by [email protected], Feb 21, 2005.

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  1. Guest

    Many of you may have opened a computer mouse and have seen two slotted
    wheels which rotates in one or another direction depending on how you
    move the mouse.. (I am talking about an ordinary rolling ball mouse)
    I was wondering how the bidirectional motion of these wheels are
    detected by only one pair of sensors for each wheel.Or are there two
    sensors embedded in one single module ? so that IR to one of the
    sensors is cut first depending on which direction the wheel rotates ..
     
  2. Guest

    Search for "optical quadrature encoder"
     
  3. Guest

    ...

    That's right. Similar principle to rotary encoders. This
    (http://ccrma.stanford.edu/~dfl/250/rotary.htm) explains rotary
    encoders quite well, and the mouse is the same, but with optics rather
    than magnetics.

    ch424
     
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