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How to choose potentiometer

Discussion in 'DIY Motion Simulator Building Q&A / FAQ' started by DonCorleonez, Mar 15, 2016.

  1. Zed

    Zed VR Simming w/Reverb Gold Contributor

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    Just to add, there are also Hall sensors that have separate magnets and sensors. While you need to be careful to get the magnet aligned with the sensor axis, that’s pretty easy to do with 3D printing and there is no bearing to gall and bind. Just make a mount for the magnet that fits to the rotating part and a mount for the sensor itself that is fixed in position. Besides the need for proper magnet alignment in the X-Y plane of the sensor, there is also a distance requirement between the magnet and sensor but these are all less demanding than alignment with the shafted Hall sensors. Plus, separate magnet Hall sensors need no lubrication because nothing touches or rubs. I used separate magnet Hall sensors and they have been totally trouble free with the only issue being my output arms hit early versions on my sensor mounts and broke them. That was preventable and entirely my fault. Operationally, no issues at all with the Hall sensors. Highly recommended - shafted or free.
    • Informative Informative x 1
  2. Arihant

    Arihant New Member

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    thanks but actually there is a problem because i want to limit the movement in +/-45 deg and the smcutility has a min clip value of 255 so with this value and the specs of my 360 hall sensor, if i set the center reference value to 2.5V or 512(adc value) the movement will reach an undesire +/-90 deg. and the solution to avoid this without use gears is changing the limits of the clip value to 512 for example , so im figuring out how to change it in the ino file.
  3. Arihant

    Arihant New Member

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    i think a found a solution, in order to represent the movement of one sensor to other, for example a hall sensor 360CW can be represented as a 180cw mapping its input values to the desires output values, in a +/- 90 deg movement centered in 2,5V [512 ADC] the 360cw sensor goes from [255] to [766] and the 180cw sensor from [0] to [1023] , so we just have to map these values in the Feedback variable , im going to try it and check how smooth it goes
  4. ChargedBoost

    ChargedBoost New Member

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    These pots are listed at 1000megOhms minimum, I keep reading 10k ohm min/max. Looks like neither of you had issues... but..?

    Also, is there any advantage to going with the 180* vs the 360* for the same price? If the resolution is the same (12bit), then the 360 should give you a little more leeway in mounting errors, yea?

    180*: 6127V1A180L.5FS TT Electronics/BI | Sensors, Transducers | DigiKey
    360*: 6127V1A360L.5FS TT Electronics/BI | Sensors, Transducers | DigiKey

    Spending more on 3 pots than I did on all my motor controllers is giving me anxiety. Thanks!
  5. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    You could technically get away with 90*, if you don't use more that 40 degrees up and down, which would be the ideal, but personally I use 180 for an extra bit of headroom, see here: https://www.xsimulator.net/community/threads/hall-effect-potentiometer.4948/#post-48019

    With high accuracy, long life and unable to be damaged by over rotation, Hall sensors may have a higher upfront cost, but are good value over time.
    • Like Like x 1
  6. ChargedBoost

    ChargedBoost New Member

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    Good point on the higher cost vs probably not having to replace them every few weeks (or so it seems from some of these posts!).

    I've checked out that thread and re-read that post several times this morning... from what it seems, no matter if you get a 90*, 180*, 360*, every degree is still worth "12 bits", right? So, if you use 90* of a 90* sensor, you're still only using the same 1080 bits of data that you'd be using if you used 90* of a 360* sensor... I think?

    Meaning, a 90* sensor seems like it would be more accurate, but in reality, it's exactly the same. But I assume this can't be the case, because why would they even sell smaller than 360.

    I design construction power systems, this small electronic stuff is strangely foreign to me and it's uncomfortable to admit that, haha!
  7. ChargedBoost

    ChargedBoost New Member

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    I went ahead and ordered the 180* versions. If I go beyond 90* in any direction I'm in trouble anyway. Thanks noorbeast!
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  8. Snapdi

    Snapdi New Member Gold Contributor

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    Thank you so much for this recommendation. I was having a terrible time 3d printing gears and designing a system with a hall effect sensors. they were not cheap in Canada (28$CAD) each, but well worth it.