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External potentiometer — Parallax Forums

External potentiometer

dev/nulldev/null Posts: 381
edited 2009-07-25 06:08 in General Discussion
Hi all,

I have an "external" circuit with a potentiometer.

I want to use a digital potentiometer on my Stamp instead.

Do I have to connect the Stamp ground to the external circuit's ground?

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Comments

  • kwinnkwinn Posts: 8,697
    edited 2009-07-25 04:01
    Most likely yes. Post a circuit if you have one.
  • $WMc%$WMc% Posts: 1,884
    edited 2009-07-25 05:13
    dev/nul

    A circuit would help!


    _____________$WMc%____

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    The Truth is out there············································ BoogerWoods, FL. USA
  • mctriviamctrivia Posts: 3,772
    edited 2009-07-25 06:08
    yes you will need to connect the 2 grounds. only exceptions i can think of is when using diferential, or wireless(rf, optical, sonic)

    most digital pots i know of use SPI interface.

    heres a really nice one: http://www.maxim-ic.com/quick_view2.cfm/qv_pk/4636

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