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Thread: Fusion Brain and Window Contorls

  1. #21
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    I see what you are saying now. I had it setup as two separate circuits which i did to make it simpler and made me more confused lol. Thanks Curiosity

  2. #22
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    Quote Originally Posted by 2k1Toaster View Post
    and for automated windows, put a current sensor on the motors. When current draw gets to about 150% of normal, it is fully up or down, so turn off output.
    Wouldn't it just be easier to put the relays on a timer?

    Pros: You don't have to buy a current sensor

    Cons: You have to time how long it takes for the window to close

    Concerns: Will the other method of using a current sensor cut power sooner than just timing how long it takes the window to roll up? I'm imagining that the timer wouldn't be active more than a second or two than it needs to be; this is also probably how long the average person holds the button longer than need be held to close/open the window.

  3. #23
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    what about sensing voltage... It's acceptable for motor speed control circuits. Motor slows=> CEMF voltage across the motor goes down, etc.
    As far as the timer, I'd hate to be the one who gets something stuck in the window.

  4. #24
    What can I say? I like serial. Curiosity's Avatar
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    A timer assumes the window will travel the full distance. If it's already closed, that's a lot of current going through the motor for a long time.

  5. #25
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    Quote Originally Posted by h3rk View Post
    As far as the timer, I'd hate to be the one who gets something stuck in the window.
    Ummm...aren't power windows required to stop (as a safety feature) when they hit an obstruction? Of course you would need feedback from the window drive motor to tell the FB it had stopped so it could turn the relay off.
    Thanks,

    Dan

  6. #26
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    Quote Originally Posted by Dan2008 View Post
    Ummm...aren't power windows required to stop (as a safety feature) when they hit an obstruction? Of course you would need feedback from the window drive motor to tell the FB it had stopped so it could turn the relay off.
    well if the output of the brain is a pulse (long enough to register factory auto-down) across the window switch, then yes you can take advantage of the OEM circuitry to provide that safety. But if the way the interface with the brain drives the window is more direct (which I would stay away from, if possible), or the window never had auto-up, then no, the overload in the window motor will probably open first and I don't think that switch is designed with obstruction detection in mind. But I might be wrong about that.

  7. #27
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    It should use the same motor overload functionality whether it has auto up/down or not. How else would it know when the window had reached the top or bottom when you just hold the switch until the windows is fully open/closed? Another thing this does is prevent broken glass.

    Even the cheap power windows ($145 for both) I'm putting in my 1934 Ford pickup will stop when it hits an obstruction regardless of whether it is auto or you are holding the switch.

    You should be able to hold the switch and monitor the circuit to see what happens when the window reaches the top or bottom.

    You might be able to put something that approximates an arm (tennis ball?) in the window path then use the auto up to see what happens. WARNING: I AM NOT RESPONSIBLE FOR BROKEN GLASS IF YOU TRY THIS METHOD!!!
    Thanks,

    Dan

  8. #28
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    I'm not sure what the wiring on windows are like but I'm assuming it's something like this:

    ----------------------------
    |
    |OPEN
    \
    \ ---SWITCH----------------

    |
    |CLOSE
    ----------------------------


    If this is the case, then setting up the relays like this is my plan


    ----------------------------
    | \
    |OPEN \ RELAY 1
    \ \
    \ ---SWITCH----------------
    /
    | / RELAY 2
    |CLOSE /
    ----------------------------



    Does anyone KNOW what the effect would be if both the "open" and "close" circuits are both CLOSED at the same time? I'm going to guess that the circuit would be short circuited and the motor would not move at all. But I'm worried what the effect on the battery and circuitry would be.

  9. #29
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    what vehicle is this...?

  10. #30
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    Quote Originally Posted by h3rk View Post
    what vehicle is this...?
    I would think that all power windows, that have a single switch, would follow that wiring. I'm not sure how else they'd do it.

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