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Thread: Stepper-Motor control

  1. #1
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    Stepper-Motor control

    Hi. (First-time poster, long-time lurker!)
    Looking at getting a fusion brain very soon to add to my car-pc, for monitoring and controlling various things.
    I've just bought a Tein Superstreet suspension setup, and I want to adjust the dampening of the suspension from within the car. Tein does sell an unit that does this (the EDFC), but I'd like to be able to do it via the car-pc.
    The tein unit consists of 4 motors which turn a screw on the top of each suspension strut tower.

    So my question is essentially, can I use the Fusion Brain to control stepper motors? I'm guessing I may need to use seperate stepper motor controllers Something like this. The two front and two back motors should run together, so I'm thinking it might be possible to run 4 motors from 2 controller boards, and control the logic inputs via the Fusion brain digital outputs.

    Is this project feasible? Or should I go about it another way?

  2. #2
    Fusion Brain Creator
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    You'd need an outboard controller, but yes, the Brain could do it

  3. #3
    inh
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    Hah! I was looking for stepper motor control for the EXACT same thing! Definitly keep an eye on me because this is one add on I am going to complete for sure =]
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  4. #4
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    I want this too!

    If somebody figures this out, please loop me in. I'd love to do this but have zero circuit designing (or software designing) skill. I do have money and patience though. So, hit me up!

  5. #5
    inh
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    I think I'm on to something here..



    from http://www.aaroncake.net/circuits/stepper.asp

    This would take 4 lines from the brain to control all 4 shocks.. One line for direction of rotation, and one line to pulse the number of positions. We would just have to keep track of where we are with the number of clicks in software.

    What we really need is more info on the stepper motors themselves.. Something I wont be able to do for 6 months. So if someone wants to post some pics, please do =]

    One key thing is the number of wires going to the motor..
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  6. #6
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    interesting... using a flip flop and a xor gate... nice and simple. I will have to take a closer look at that circuit in the morning.
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  7. #7
    inh
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    Im actually starting to wonder if the brain couldnt control the motor itself... I wonder how much current those motors draw.. Probably more than the 400mA that's safe for the brain.. hrm..

    This is one project I cant wait to get started on =D
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  8. #8
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    Good job finding that schematic. Things have already moved on significantly.
    I do a bit of electronics, but not circuit design. So this is a bonus.
    I was planning on buying motors seperately, rather than buying the tein edfc unit with the motors.
    I have the shocks ready to be fitted when I get a chance - I'll post some pics later.
    For those of you who haven't seen the teins - the damping is adjustable to 16 levels. There is a clicker at the top of each shock which adjusts a valve within the shocks, controlling the flow of oil and thus the damping.
    The clicker mechanism can be rotated by hand or using an allen key. Each damping level is a 45 degree turn.
    I believe the clicker can be removed to give a smooth rotation. The tein EDFC unit makes 22.5 degree turns, to give 32 levels of stiffness.

    So basically I need to work out how much torque is needed to turn the screw, then I can go about looking for some suitable 12V motors.

    This should be good. I'm already imagining the front end! Perhaps we could use an accelerometer to automatically stiffen up in the corners according to lateral G!

  9. #9
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    Given what you have done so far, it's quite possible to create a universal "EDFC" unit for other coilovers that have adjustments of the same type as Tein (on top of damper). What do you think?

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