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  1. #1
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    Leo Bodnar Bu0836x

    I am building a new version of my TQ. Have an old one built with Bu0836.

    I bought Leo's BU0836x this time.
    The linear pots I ordered - 10 ohms - don't have the terminals marked.

    How do I determine which is GND and which is the wiper?

    I tried doing this with a multimeter but I get 2 different leads giving me wiper behavior.

    Your help is appreciated.

    CPJ

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    Re: Leo Bodnar Bu0836x

    Hi,
    Try to find the two terminals that show NO change in resistance when moving the wiper, then the terminal left over will be the wiper.

    Andy

  3. #3
    75+ Posting Member Leo Bodnar's Avatar
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    Re: Leo Bodnar Bu0836x

    Did you mean 10 kOhms? 10 Ohms is a bit low...

    You need three wires to connect the pot. It is important that wiper is identified and connected to axis input.
    The other two wires are +5V and GND but they can be swapped with only effect being axis reversal.

    Andy gave a great advice!

    Also, typically you'd have one pin on one end and a pair on the other. Input is one of this pair.

    The other way to id pins is to put the slider in the middle position. Measure resistance of possible pin pair combinations. The highest one would be between GND and +5V ( ~10kOhms) so the left over is wiper. Wiper will measure about 50% (~5kOhms) to each GND and +5V.

    Does this make sense?

    Cheers
    Leo

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  5. #4
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    Re: Leo Bodnar Bu0836x

    Quote Originally Posted by ANDYSMITH View Post
    Hi,
    Try to find the two terminals that show NO change in resistance when moving the wiper, then the terminal left over will be the wiper.

    Andy
    THANKS! Worked perfectly. Now, i get the mid point of resistance give me mid position on my calibration values...

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    Re: Leo Bodnar Bu0836x

    Quote Originally Posted by Leo Bodnar View Post
    Did you mean 10 kOhms? 10 Ohms is a bit low...

    You need three wires to connect the pot. It is important that wiper is identified and connected to axis input.
    The other two wires are +5V and GND but they can be swapped with only effect being axis reversal.

    Andy gave a great advice!

    Also, typically you'd have one pin on one end and a pair on the other. Input is one of this pair.

    The other way to id pins is to put the slider in the middle position. Measure resistance of possible pin pair combinations. The highest one would be between GND and +5V ( ~10kOhms) so the left over is wiper. Wiper will measure about 50% (~5kOhms) to each GND and +5V.

    Does this make sense?

    Cheers
    Leo
    Makes absolute sense. Yes 10K was what i meant to write. It worked fine.

    While on the topic, would a 100k resistor provide better resolution? Of course, it would also mean more dissipation due to higher resistance.

  7. #6
    500+ This must be a daytime job ian@737ng.co.uk's Avatar
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    Re: Leo Bodnar Bu0836x

    hi

    no not really. what does matter is the controller card you are hooking up to. an 8 bit card will report 255 steps over the range of the pot, a 10 bit card will report 1024 steps and a 12 bit card (which you have in the BU0836X) is going to give you a whopping 4096 steps.
    so, in short the higher the resolution of your card, the more smooth and accurate your input is going to be.
    good luck and regards from wales .....

    ian
    Mr. Ian. P. Sissons is hereby recognised as an Honorary Flight Sim Captain following his passing in February 2016. This is in recognition for his commitment to Flight Simulation.

    www.mycockpit.org Featured Builder August 2008 www.737ng.co.uk
    FS9/PROSIM737/CPFLIGHT/Lots of BU0836X's and a Beer Fridge

  8. #7
    Our new friend needs to reach 10 posts to get to the next flight level
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    Re: Leo Bodnar Bu0836x

    hi Leo
    Could you please help me here.
    I went to my basement and found a thrustmaster gameport joystick, I want to convert to USB using bU0836x card. I see that the pots are connected using just 2 of three terminals, one must be the wiper and the other I think is the +5v. Can I connect this way to the card, or must I copnnect 3 pot termimals to the card?

  9. #8
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    Re: Leo Bodnar Bu0836x

    You should connect all three potentiometer terminals to the card.

    The old gameport design took a different approach to measuring the pot resistance than does the BUO836.

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