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Thread: Thumbwheel switch

  1. #1
    Tuck3rz Newbie
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    Oct 2009
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    Default Thumbwheel switch

    Hi... Can i know what is a Thumbwheel switch for?
    And if so, how do you read the pin configuration


  2. #2
    DirtyLude Excellent DirtyLude Excellent DirtyLude Excellent DirtyLude Excellent DirtyLude Excellent DirtyLude Excellent DirtyLude Excellent DirtyLude Excellent
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    Default

    It's usually used for scrolling navigation in handheld devices. You can figure out the pins by reading the datasheet or simply using a multimeter to find out what they do when you operate it.
    Mark Higgins

  3. #3
    PatM Newbie
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    Apr 2009
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    BCD Thumbwheel Switch is used to input-set data in digital form, this can be read by digital circuits, uC and uP systems and PLC-SCADA Interfaces.

  4. #4
    alhoop Newbie
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    Dec 2008
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    Default

    I use two thumbwheel switches to select stall/service tracks for a model railroad roundhouse and turntable. Here is how to read the two switches using a PicAxe controller with the switch commons tied to + voltage.

    cnt1 = pins & $0F
    cnt1 = pin4 * 10 + cnt1
    cnt1 = pin5 * 20 + cnt1

    If the switch commons are grounded and b0 can be used
    then use the following:

    b0 = pins ^ $3F
    cnt1 = b0 & $0F
    cnt1 = bit4 * 10 + cnt1
    cnt1 = bit5 * 20 + cnt1

    cnt1 is the decimal value of the two switches.

    Al

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