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Question my simulator 2DOF car

Discussion in 'DIY Motion Simulator Projects' started by Miguel33, Mar 31, 2025 at 13:04.

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  1. Miguel33

    Miguel33 New Member

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    My Motion Simulator:
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    Good afternoon;

    I'm new to this forum and decided to write to you because I'm building my simulator for a two-axis 2DOF car, and I have several questions. In my case, I want to build it with 24V windshield wiper motors connected to a 10K linear potentiometer. Since I've seen that there are setups with the Hall sensor, is it the same Arduino program or is there a specific one for potentiometers?

    On the other hand, I have another question: Does SimTools necessarily have to be paid, or is the demo version sufficient?

    Thanks in advance, and best regards, everyone.
  2. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
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    A Hall sensor can be a drop in replacement for a 10k pot, with no change to the Arduino code.

    The Demo version of Simtools includes the fully functional plugin for Live For Speed, specifically for testing purposes. But a licensed version is required to run other plugins.
  3. Joe Cortexian

    Joe Cortexian Active Member Gold Contributor

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    In most cases, windshield wiper motors are not powerful enough to provide a fulfilling experience. However, they are not all the same. You want something that can provide at least 20 Nm of torque. Generally, that will require a motor rated at a minimum of 100 watts. If the motor is not labeled, you can measure the torque using a luggage scale or a fish scale.

    I use Hall sensors. These are great because they’re durable and hard to break, but they require precise positioning of the sensor over the magnet on the shaft. By default, they use a digital protocol, which takes too much time. There’s a little-known trick: you can remove resistor R2 on these sensors to get a PWM signal instead. You cannot run the PWM signal directly into an analog input, though—you’ll need a filter, which consists of one resistor and one capacitor. The upside of using PWM with a filter is its strong noise immunity.

    https://a.co/d/7VtW2Gp

    The SMC3 code remains the same, but you may want to improve the method for setting the level position to 512. I spent far too much time turning the magnet on the shaft to align 512 with "level" before adding five lines of code. In this case, it just needs to be within ±256, because the zero crossing is inconsistent and causes issues.
  4. Miguel33

    Miguel33 New Member

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    First of all, thank you for the quick response.

    Regarding the engines, I hope they have the necessary torque.... They are Valeo models 404.999 and 404.935.
    I'm looking for the technical features but I can't find them. Do you know something about these two engines???

    Thank you very much again.