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DIY FFB Steering wheel (MMosFFB ) (In Progress)

Discussion in 'DIY peripherals' started by Alexey, Dec 10, 2015.

  1. foxmulder18

    foxmulder18 New Member

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    Hi, I am a new User. I have ı few questions. 1- I want a strong FFB .
    Which engine should I use? 2- I cant found disc encoder in my location. Can ı use black rotary encoder and
    how many ppr do i need . 3- I need wheel , pedals, shifter base layout. Thx for your help. My private email : enesbtfb@gmail.com
    Last edited by a moderator: May 5, 2020
  2. ejdlignacio

    ejdlignacio New Member

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    Hi everyone, so my DIY wheel is currently set-up with 2 RS775 motors connected in parallel to 2 BTS7960s connected in parallel too. I did this minimize the number of wires running from my motors to my control box and to ensure that they rotate identically. Would separating the motors and drivers (two sets of RS775 + BTS7960 connected to the STM32) instead of using them combined have any advantages?
  3. elnino

    elnino Active Member

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    I can't think of any obvious reason that it would or would not be recommended but consider the current source and sink ability of each.

    i.e 2 Motors in Parallel is 1/2 the resistance, but you're doubling the current handling ability by 2 7960's in parallel too. However, by keeping them separate, it may 'load balance' better. It's hard to tell without testing directly but my guess is that the mechanical difference would be somewhat negligible.

    However, if the motors are not perfectly matched (resistance etc), you may end up with one motor getting way more power than the other and more likely to melt rather than a true balance than you think you have. This may mean there is a reliability reason rather than a performance based reason to separate them.

    If you want to try, leave the 7960 in parallel (inputs) but just change the outputs. There's no issue with them rotating identically as they don't really rotate (you're not matching speed/voltage), it's force applied which will still be cumulative from each motor.

    I suggest using some sort of temp sensor to monitor each of the motors.
    • Informative Informative x 1
  4. Zahid

    Zahid New Member

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    hello, if i use another motor rather then the denso one, do i need to make change in the firmware>?
  5. Chris_Beeves

    Chris_Beeves Member

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    What type of motor driver will you be using?
    There is not much more to change in the fw except the PWM behavior, so probably no. :)
  6. Zahid

    Zahid New Member

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    BTS7960 is the driver i intend to use. Can u tell me what is pwm behaviour? Im a beginner.
  7. Chris_Beeves

    Chris_Beeves Member

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    What microcontroller do you plan to use? If you are a beginner I would suggest EMC, it is quite easy to use. The STM or the Arduino that it uses is quite cheap too. The MMOS STM can be a bit pricey.

    The PWM behaviour is how the microcontroller sends the force data over to the motor driver. It is different for different drivers. I think the BTS uses 3 signals; one PWM left, one PWM right and a "enable" signal. At least when you use the EMC.
  8. Zahid

    Zahid New Member

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    I will use arduino leonardo
  9. Chris_Beeves

    Chris_Beeves Member

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    What firmware? EMC or Aiwave?
  10. Zahid

    Zahid New Member

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    Im not sure yet. Cant understand whichi should i use. Can u help?
  11. Chris_Beeves

    Chris_Beeves Member

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    Like I said before, choose EMC. It is very easy to use and quite well documented. There are a few YouTube videos covering it. Search for Ebolz Magy
  12. Zahid

    Zahid New Member

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    Thank you.

    Which one is the best firmware? I may change my Setup according to that.
  13. Chris_Beeves

    Chris_Beeves Member

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    EMC
    • Agree Agree x 1
  14. Fzonta

    Fzonta New Member

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    [QUOTE = "doddynco, post: 170342, membro: 26752"] Encontrei uma maneira de parar o atrito não preciso O : sorrir retorno da força melhorou maciçamente. Isso significa que a ponte H nunca aterrissa na configuração do loop de terra causada por ter R_EN e L_EN sempre em 5v.

    O Mmos precisa ser definido como 'PWM & dir', 16,8khz. Coloque o pino 9 em L_EN e R_EN. Pino 11 a RPWM e pino 10 LPWM (dependendo da polaridade do seu motor, pode ser necessário inverter o pino 10/11)

    Nesta configuração, 50% pwm = 0motor; Ainda não sei por que isso é verdade - mas é verdade, pelo menos para mim. A solução é definir o ganho mínimo de feedback da força do jogo em 50% - encontrarei um trabalho mais permanente em torno do uso de hardware, mas, por enquanto, funciona muito bem. Além do mínimo de FFB no jogo, use a configuração de ganho mínimo da configuração do mmos para o ajuste fino (cerca de 1% a 5% normalmente). Testado por mais de 40 minutos e o motor não estava mais quente do que na configuração antiga, pode até estar funcionando mais frio.

    Como experimento, removi o capacitor pequeno de 300uf (fica no trilho de alimentação entre positivo e neutro) do IBT2 e funciona bem. No entanto, sinto um pouco mais de 'conversa' elétrica com os componentes - se esse é o termo certo o_O. Enfim, acho que ele atua como um filtro para picos de tensão de frequência muito alta causados pela comutação PWM sob carga - tenho certeza de que o pequeno capacitor deve ser deixado no lugar.

    O parágrafo a seguir ainda não foi testado, portanto, tente apenas se você conhece as implicações do que está fazendo - os capacitores são potencialmente muito perigosos:
    Além do capacitor pequeno, acho que um capacitor grande de 2000uF + em paralelo ajudaria ainda mais a regular a tensão de alimentação. Espero que isso signifique que podemos girar a roda com ou contra o motor, e o trilho de alimentação mantém a tensão.

    Por fim, para evitar o alto nível de força mínima do jogo, tentarei projetar um simples pós-processador pwm para fazer ...... <50% pwm = 0% pwm ....... 50% pwm = 50% pwm ........ 100% pwm = 100% pwm ....... para que não tenhamos nenhuma mudança desnecessária dos mosfets. Isso deve ajudar no resfriamento e em algumas outras pequenas coisas sem importância para os detalhes. [/ QUOTE]

    Hi....

    which pins on IBT_2 do you use?
    I am currently using MMOS with STM32.
    like this:
    ---------------
    BTS | STM32
    ---------------
    GND | GND
    R_EN | 5V
    L_EN | 5V
    RPWM | PE9
    LPWM | PE11

    in MMOS

    PWM Mode: PWM(H-Bridge)
    PWM: 4.2khz
    Encoder CPR: 8000 (my is 2000ppr)
    Reverse Encoder: Unmarked
    Use Encoder Index: Unmarked
  15. Konzi Lee

    Konzi Lee New Member

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