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K8055 and Sabertooth problem!

Discussion in 'SimTools compatible interfaces' started by libory, Jan 4, 2012.

  1. libory

    libory New Member Gold Contributor

    Joined:
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    Hello, I have finished my platform with a K8055+sabertooth 25A+wiper motors and I have a big problem trying to make my first profile with a few simulators like Dirt2 and GTR evo and I wonder if anybody had similar problem and how to fix it.

    The problem is:

    - I setup 2 axis one for each wiper motor. Added math to test with the test plugin, variable 21. Limits 1100 and 10 for both motors.
    - I made the proper Synaptrix for both motors with Dynamic speed and all working but.......


    I noticed one thing..... It drives me crazy because I can't understand what is going on....

    When I turn in game left and right for example it works but then I noticed when I put the car forward or straight the platform stays in the last position it was and..... I noticed playing very slow with the test sliders... the positive values moves to one direction and the negative to other but... what happens when you move to positive and then it goes to another side? there is a gap from +X to 0 to -X (lets say it moves to 100 and then it goes to -100 but then ignores all the value from +100 to 0 and then it moves to another side) where the motors don't move and the same for -X to 0. How is possible that? in another words I can't make the car going to centre because it need the opposite direction to turn to another side.....

    It is like absolute or incremental values and X-sim uses absolute value an sabertooth uses incremental values.

    I wish I could explain better :(

    And because this boards are made for 0 to 5v but in the middle is stop and 0 is full speed in one side and 5v is full speed to another side I was wondering if sabertooth boards are not made for X-sim. I have seen many projects here made with these boards and I wonder if everybody had this problem and just ignored this.

    thanks a lot I hope someone can tell me something because this is really frustrating. I have been fighting with this for the last 3 weeks... :blush: