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PPDB Rev A (Gray) Potentiometer Hardware Test — Parallax Forums

PPDB Rev A (Gray) Potentiometer Hardware Test

microcontrollerusermicrocontrolleruser Posts: 1,194
in Propeller 1

Developers

Going to test potentiometers with an ohmeter.

Yes, we are easily amused.

Any tips on this?

Thanks!

Comments

  • PublisonPublison Posts: 12,366
    http://www.instructables.com/id/How-to-measure-resistance-of-a-Potentiometer/
  • kwinnkwinn Posts: 8,697
    One lead of the ohmmeter on the wiper lead and one on one of the other two leads. Take measurements in evenly spaced steps between fully counter clockwise and fully clockwise.
  • Duane DegnDuane Degn Posts: 10,588
    To monitor the wiper with the Propeller, you'll either need an ADC chip like the MCP3208, a delta sigma circuit or a RC time circuit.

    I'm pretty sure the PPDB doesn't include an ADC chip.
  • PublisonPublison Posts: 12,366
    edited 2017-01-24 20:51
    Duane Degn wrote: »
    To monitor the wiper with the Propeller, you'll either need an ADC chip like the MCP3208, a delta sigma circuit or a RC time circuit.

    I'm pretty sure the PPDB doesn't include an ADC chip.

    You are correct Duane. An ADC0831 is easy to install on the breadboard.

  • microcontrollerusermicrocontrolleruser Posts: 1,194
    Publison

    Somewhere their is a step by step section on it.

    Might be PEKit manual.

    Duane

    Will file your suggestion away for later.

    Thank you.
  • microcontrollerusermicrocontrolleruser Posts: 1,194

    Developers

    Potentiometers work.

    Thanks!
  • JonnyMacJonnyMac Posts: 8,926
    Yeah, Parallax is pretty good about shipping product that works as designed. :)
  • microcontrollerusermicrocontrolleruser Posts: 1,194

    Mr Johnny

    Don't look at me.

    Some parallax manuals (might depend on the writer).

    Use the same approach.

    Hardware test before run experiment.

    Thank you.
  • JonnyMacJonnyMac Posts: 8,926
    edited 2017-01-25 01:49
    I've been doing this a while (about 45 years). Let me suggest you use forum posts for circuit and code discussions. Announcing a successful test without sharing the details of it is not terribly useful.
  • Buck RogersBuck Rogers Posts: 2,161
    And Jon, I agree. Same amount of time. Microcontrolleruser, the gentleman standing next to a blinking thing from a TV program is indeed correct.
  • microcontrollerusermicrocontrolleruser Posts: 1,194
    Developers

    3 contacts. Left-middle-right.

    connect left and right got value of potentiometer.

    connect left middle ohmeter swung one way.

    connect middle right swung the other way.

    Thank you!
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