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Thread: Input and Output configuration questions

  1. #1
    FLAC
    Join Date
    Oct 2006
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    Las Vegas
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    Input and Output configuration questions

    I thought I'd un-bury these questions from the AC tread, I don't know if it will get answered otherwise:

    Input Question:

    Inputs have three leads: low ref, high ref, and sensed right?

    Is the low ref side the same as ground?

    Can I leave sensor low reference disconnected from the board and connect it to gnd somewhere else if I plan to use that path as a return path for current from a servo motor as well as sensor low reference?

    Will that affect sensor reading at the middle terminal?

    See Beginning of an Automatic Climate Control System, all juiced up on Fusion for context.

    Output question:

    Can I tie the + side of several digital outputs together, I would assume it would be fine, and that the + side of the outputs (the non transistor side) comes from one place anyway, but I thought I'd ask.

    Then again, it's not like I can get these things to work on my computers anyway

  2. #2
    Fusion Brain Creator
    Join Date
    Mar 2005
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    2,221
    all three wires should be run back to teh fusion brain. we sell 3 pin extensions for this.

    you can tie together the + side. ground is switched.

  3. #3
    FLAC
    Join Date
    Oct 2006
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    Las Vegas
    Posts
    1,286
    Quote Originally Posted by greenman100 View Post
    all three wires should be run back to teh fusion brain. we sell 3 pin extensions for this.
    bad news for me. how much current can the low side take?

    Edit: Enough for a servo motor's drive current?

  4. #4
    FLAC
    Join Date
    Oct 2006
    Location
    Las Vegas
    Posts
    1,286
    There, I bought some 3 pin extensions, are you happy now?

    I guess I'll have to hack the servo and seperate the two circuits, pre brain....thanks for the info.

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