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Piggy-back a resistive touch screen?

Discussion in 'General Electronics Discussion' started by Thecheat, Sep 23, 2010.

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  1. Thecheat


    Sep 13, 2010
    I'm trying to set up a toggle switch to swap between two resistive touch screen controllers on the same controller. I thought I could do it by attaching the 4 touch leads (X+, X-, Y+, Y-) to both controllers and toggling power to one chip or another but the powered down controller threw off the measurements.

    So my next idea is to put a DPDT switch in between the two controllers and the negative leads and use that to switch the controllers. Hopefully this will work as I do not have enough room for a quad switch.

    Any thoughts on this? Should I switch the positive leads instead?

  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    Jan 21, 2010
    well, I would use (at least) a 4PDT switch to switch X+. X- Y+, and Y-.

    But you may need more poles to switch either the power or the outputs, depending on how you have it all connected.

    If you don't have room, find a smaller switch :)
  3. Thecheat


    Sep 13, 2010
    Easier said than done but yeah, I may need a 4 pole switch. Only problem is I have an area about 3/8", maybe a little more, where I can stuff a switch.
  4. Thecheat


    Sep 13, 2010
    Well, I dug around and couldn't really find a switch to fit my size constraints. I'm going to try to make this happen with a DPDT.

    Would I be better putting the switch on the positive or negative side? I'm assuming positive, correct?
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