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pololu TRex Jr - Force profiler output

Discussion in 'Force-Profiler Simulator Control' started by frenzy10, Oct 16, 2011.

  1. frenzy10

    frenzy10 New Member

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    Hi

    I have a Pololu Trex Jr board and have force profiler 2 outputing to it. I can see the data LED flashing so know that data is being transferred. However I am stuck when trying to get the output to scale correctly.

    The Pololu can take 7 bits of data as a value (after the control byte) but no matter how I try and change the data in the FP2 output section the LED stays on (indicating a high value).

    If I add the following line to the output string I can make the LED intensity change to indicate that the board is operating correctly:

    ~240~~00~ -> all the way up to ~240~~127~

    However as soon as I use ~240~~a01~ the LED jams on.

    I am using the Test tablet to create a nice oscillating input from Force Sender.

    Obviously the Maths section and the scaling feature on the Output page are confusing me.

    Can anyone help with scaling the output?

    Many thx
    frenzy10, Oct 16, 2011
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  2. frenzy10

    frenzy10 New Member

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    Just to close this off - got there in the end myself after re-reading this post:
    arduino-and-x-sim-t2773-20.html

    Still not sure I understand the scaling used by the testtablet but setting the lower end to 200 and the upper to 0 helped. I guess 0 to 200 would be ok if I inverted the G force plugin on the Maths section of the profiler. I also set the max and minimum values on the graph to 0-127 within the math section. So now the testtablet outputs values that start at 0 and pass through 127 at the mid point (somehow!)

    I then modified my Force profiler to send out binary even though the Trex documentation mentions decimal and hex.

    So now I can use the testtablet to incrementally increase the motor speed on the board.

    One problem down, many more to come no doubt.
    frenzy10, Oct 17, 2011
    #2