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smc3 help and sim tools

Discussion in 'DIY Motion Simulator Building Q&A / FAQ' started by Che Franklin, Dec 31, 2019.

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  1. Zed

    Zed VR Simming w/Index Gold Contributor

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    The waveform you see is probably really more square wave. That's how H bridges work with PWM waveforms in there too (what you are actually seeing - the H bridge just reverses the power leads when the motor needs to go the other way but the main thing is the PWM waveform). But motors are big inductors and will oppose rapid voltage changes - the fast rise in square waves. That effect rounds off square waves into rounded square waves but can go to sine.
    • Informative Informative x 1
  2. Che Franklin

    Che Franklin im alot brighter than i look.. Gold Contributor

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    one thank you so much for the input
    two lo0ve the icon..
    this is the video of the test you tell me? my shakey hands FML im sooo old
    Last edited: Jan 30, 2020
  3. Zed

    Zed VR Simming w/Index Gold Contributor

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    From what I see, I think you don’t have an internal ground that you need to disconnect. I don’t understand the extra terminals so that’s qualified.

    So back to saggy voltages, I don’t know. I don’t have an explanation for why one motor seems to be ok and the other gets hot. Are the connections identical on both motors? All those extra connection possibilities are odd but I’ve not used wiper motors. You also mentioned multiple brushes. Most motors just have 2 brushes that I’ve seen, 180 degrees across from each other. Yours have more than that?

    Maybe one motor has a shorted winding? Have you been in both of them and both look good inside?

    I’m out of ideas at this point. Maybe someone else has more ideas?
  4. Che Franklin

    Che Franklin im alot brighter than i look.. Gold Contributor

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  5. Che Franklin

    Che Franklin im alot brighter than i look.. Gold Contributor

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  6. BlazinH

    BlazinH Well-Known Member

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    It's a two speed wiper motor. The offset brush is used for slow speed instead of reducing the voltage.
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  7. Zed

    Zed VR Simming w/Index Gold Contributor

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    Ah! Thanks!
  8. Zed

    Zed VR Simming w/Index Gold Contributor

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    @Che Franklin - I use pgsaw motors that I got on ebay.

    https://www.ebay.com/itm/GEAR-MOTOR...LL-FEED-SIMULATOR-75-80RPM-50-1-/371596157992

    The controllers I used are the Pololu JRK 12v12. A bit more expensive than Arduino and a Monster Moto but the capability and setup are really well done.

    Build here: https://www.xsimulator.net/communit...-20-strut-jrks-wind-flying-driving-rig.11281/

    One thing about the JRKs is most cool them with heat sinks on the component side of the board. I have had excellent results cooling the bottom of the boards. Details in threads linked in the build thread.
  9. Che Franklin

    Che Franklin im alot brighter than i look.. Gold Contributor

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    Thx I see all diff/ones on amazon diff prices ?
    All so am I ok with wiper motors for now?
    After doing this project I defiantly want/need to change alot...question if I use 4 wiper motors for the corners of the 80/20 wipers and then those u motors u suggested
    I’m gunna hold off til I hear back is it still one per motor?
  10. Che Franklin

    Che Franklin im alot brighter than i look.. Gold Contributor

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  11. Zed

    Zed VR Simming w/Index Gold Contributor

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    Hey Che, well that’s news about the 12v12 being discontinued but the other options seem suitable except the 21v3 since that’s a low current version. The others all seem to have significantly higher voltage and current ranges. Like I said, most are overloading the 12v12 anyway and would have gone with higher rated versions had they been available. But these new designs also have components on both sides so the way I did my heat sinks won’t work with these. It will take some modification to work. Probably not much, though. Even though there are 147 12v12s still in stock, were I doing it now, I’d look at the 18v27. But it costs half again as much. Other controller choices might have more in their favor now.

    I’m using 600W power supplies on my rig so currents can potentially hit 50A. I’m fused at 35A though and have yet to pop one so currents for mine are on average lower. I’ve got ammeters on each motor and don’t think my average currents go too much above 20-25A on a full frame rig, so based on my numbers, the 18v27 ($149) is probably OK. I was OK running my JRKs outside of spec because the main issue was heat and the heat sinks did so well. Some suspected the inductive kick was killing them and that’s why I added the big high current chokes to block those somewhat. Since these will take some other heat sink solution, I can’t recommend a version that’s too far out of spec. Lower rating JRKs probably work fine though. And it’s your money. You may not want to gamble on them standing up so well. People were occasionally pretty upset when their 12v12s would pop. It looks like the power components on the bottom still might heat sink well. Just a little differently.

    The JRKs are one per motor. I can’t say on wiper motors vs pgsaw but think the pgsaw motors are more powerful and more suitable for full frame or heavier rigs. Many people here use them. I’ve only built the one rig with pgsaws and JRKs so am not really a good person to tell you which way to go. It’s also your money. I can tell you my rig now has a couple of years on it and has worked great. The drive train has been rock solid. My choice was pgsaw and JRK but I wasn’t really trying to economize.

    I don’t know your experience level but I’d really suggest looking through more builds to see what components others have chosen and what you like and don’t like about their builds. Builds take a lot of time and effort and I really recommend weighting the front end to minimize money spent and time wasted.
  12. Che Franklin

    Che Franklin im alot brighter than i look.. Gold Contributor

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    much gratitude...
    i started with the Blue 43 amp they all seem to be junk but 2-$14 what can i ask..
    I'm a capable fabricator. i don't want to buy the "electronics" again. I was looking at Robo-claw IDK def Gunna dig a bit more for sure
  13. Che Franklin

    Che Franklin im alot brighter than i look.. Gold Contributor

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    Zed, Mate Thx Soo much
    ok so i cant afford $200 4 the pololu

    how do you feel about sabertooth or RoboClaw? i can afford 1-of them.
    https://www.basicmicro.com/RoboClaw-2x30A-Motor-Controller_p_9.html
    My Currant Component List:
    I/H=In-Hand

    2 TBD Motor Controllers NEEDED
    1 Arduino Mega 2650----------------------------------------------------------------------------------------------------------------I/H
    1 Arduino UNO R3 Replica ---------------------------------------------------------------------------------------------------------I/H
    2 -Wiper Motors for 2dof seat mover ----------------------------------------------------------------------------------------------I/H

    Power
    1 600w CPU PWR Sup---------------------------------------------------------------------------------------------------------------I/H
    1 -12v SUV Battery--------------------------------------------------------------------------------------------------------------------I/H
    1 -10-farad Hybrid Capaistor For High AMP Draw-------------------------------------------------------------------------------I/H
    1 DieHard Car Charger with 2amp/15amp Trickle and engine start------------------------------------------------------------I/H

    Add-ONs if Possible
    Directional Wind simulation using drone motors and ESC and UNO or MEGA-----------------------------------------------I/H
    Seat Belt Tensioner 4-point----------------------------------------------------------------------------------------------------------I/H
  14. noorbeast

    noorbeast VR - The Next Generation Staff Member Moderator

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  15. Zed

    Zed VR Simming w/Index Gold Contributor

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    Che, lots here have used the Sabertooth as Noorbeast points out. They look fine to me but I have no experience with them.

    People here have also used an Arduino based controller called Monster Moto. I looked around and prices on those seem high right now and many places have them at $71 but out of stock. One place (robotshop.com) listed a Feb 29 restock date so maybe another board run is in the works and prices will go back to around $20 when they hit? There are clones available on ebay but people seem to get dead ones occasionally.

    Quite a few have used them and can comment on their experience but if you can find those in the $20 range, that could save some money. They are based on the same chip as the JRK 12v12. Not sure why the dry spell but apparently the Monster Moto may come back into stock soon. They are very popular with Arduino folks.

    May be another option if you can get them at a good price. One thing is they fit on top of the Uno. You’d need to check to see if it fits a Mega since you have one of each.
  16. Che Franklin

    Che Franklin im alot brighter than i look.. Gold Contributor

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    Thanks ALL
    i have ordered the sabertooth 32
    the goal of this project was to see how difficult it was to build, program and deploy with using as many parts that I already had, the hardest part so far has been due to "BAD" motor controllers and a HUGE Lack of understanding of this matter...

    the final goal will be to build an 80/20 rig and do all 4 corners of the platform so ill need 4 new motors and another sabertooth... or 4 Pololu de
    once I get this going I'm sure ill see the apex of the curve.
    ZED mate without you i def would have blown this up ...out of frustrations...
    BEAST thx for the link
    2 day shipping cant wait


    BTW also, BEAST have you seen anyone using esc and drone motors for wind?
  17. Zed

    Zed VR Simming w/Index Gold Contributor

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    I'm glad it helped, Che. I tend to make things more complicated it seems but try to help. Good luck! There's lots of people here with Sabertooth experience. There are some caveats to the setup you'll need to be aware of IIRC. Switch settings and such if I'm not confusing them with another controller.
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  18. Che Franklin

    Che Franklin im alot brighter than i look.. Gold Contributor

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    see you on the track and in the air DSC is next
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  19. Che Franklin

    Che Franklin im alot brighter than i look.. Gold Contributor

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    man if i didn't have bad luck.... i wouldn't have any..
    followed the link to the letter
    ERRROR SMC3
    Comm with Arduino seems unreliable. ERROR getting Kp Values From Motor 1?
  20. Che Franklin

    Che Franklin im alot brighter than i look.. Gold Contributor

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