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Revisiting Ego's K8055 pot fix

Discussion in 'SimTools compatible interfaces' started by kjg71, Feb 12, 2009.

  1. kjg71

    kjg71 New Member

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    Ego and also eltxus,

    Ran across a few threads on the K8055 pot wiring reccomendation which refers to Ego's original. post:

    post6532.html?hilit=%20ic1%20remove#p6532

    I had a few questions on this.

    First I have not had success even with the included demo program in getting a pot to to move the slider in the demo (trying to first test this)

    I have tried all configurations and it just shakes on the slider not really getting the pot input to do anything with the slider

    using 5V positive off of SK2 (also tried SK3) ground is common so connecting oppisite end to ground terminal tried all of them (but they all should be common)

    wiper connection to A1 or A2 and nothing. This is how I expect it to work.


    Ego, Your drawing suggest bypassing it all and going to PIC as well as removing the IC1 (I want to say you mentioned it adds noise or interence)?

    anyway, If I do this, will it resolve the issue? or should I at least be getting something the standard way.

    I understand your method as you are suggesting a more accurate connection (which I definately rather have), but would removal of IC1 loose my pwm output ability or are they not related and Ic1 is strictly for the analog ins? just want to make sure before doing the surgery.

    el_txus,

    In your implementation, you have the jumpers on for the SKs. Is this required and is it also required to pull the 5V from the Pic or can you just use 5V from SK2 or 3 (of course then they have to be not jumpered or the at least not the one you are wanting to get 5V from. Maybe my problem is I do not indend on using the internal pots so did not install the headers for sk2 /3. maybe this is my problem? Do they need to be there and jump for external to work? BTW...where did you get those flat jumper wire pins that connect directly to the PIC's connectors from board's top in a really snug fit? so that no soldering required....or are they just standard bent pins?

    There is really a lack of documentation from velleman concerning Analog in for K8055. I have had support state you can use internal 5V with pots and then come back again and say you can't as it may damage the board. Pretty bold state to say one thing and then state you can damage in another post.

    You guys have obviously had success and are using it fine so just want to hammer out the details from real users of this method.

    Ego, I realize, you might not be using K8055 anymore but maybe you can remember you experiences when you did get it going.

    Thanks!
    kjg71, Feb 12, 2009
    #1