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Differences in 2DOF tutorials?

Discussion in 'DIY Motion Simulator Building Q&A / FAQ' started by James Robbie, Jun 14, 2017.

  1. James Robbie

    James Robbie Active Member

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    My Motion Simulator:
    2DOF, DC motor, Arduino, Motion platform
    Hi all,

    I am completing my first 2DOF build (https://www.xsimulator.net/community/threads/first-diy-2dof-attempt.10333/) and making the dive into motion. Once question i have wondered is can there be end performance gains based on coding?

    The two tutorials I am referencing in particular are:
    1. https://www.xsimulator.net/community/marketplace/arduino-code-2dof-and-2-pins-direction-hbridge.67/
    2. https://www.xsimulator.net/communit...3dof-motor-driver-and-windows-utilities.4957/

    Yes I understand the 2nd thread is based on a 3DOF build but I am basing my build off this as it seems to be the most popular and if I want to expand, I have the choice. But with a slightly different wiring schematic between the two, that obviously means different code and a potential for things to communicate differently.

    Obviously any game will always output the same information and I understand hardware is the biggest variable but, if all hardware was equal, can there be a noticeable end performance difference based on arduino code?
    James Robbie, Jun 14, 2017
    #1
  2. RandomCoder

    RandomCoder Active Member Gold Contributor

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    The short and simple answer is yes, the way in which the program is written can have a significant impact on the performance of your motion sim.
    I haven't compared the two programs you have referenced and so my answer is not targeted toward them in any way.

    The processor has several operations that must be performed repeatedly every loop of the program. It has to manage communications (game data), process a variety of inputs including positional feedback from the drives and control the outputs accordingly.
    Some programs may have additional features such as controlling the accel/decel of the motor output, range limiting, filtering of the positional feedback etc.

    The main loop should be kept as clean as possible so that the code remains responsive e.g some optimised code might only check for new serial data every 'x' number of scans instead of every scan for example.
    RandomCoder, Jun 14, 2017
    #2