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PICMICRO 16F887 --18f2550 USB virtual Comm--

Discussion in 'SimTools compatible interfaces' started by kubing, Oct 20, 2010.

  1. kubing

    kubing Member

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    Re: PICMICRO 16F887

    working on cockpit right now..will update soon. thanks frakk :D
  2. kubing

    kubing Member

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    Re: PICMICRO 16F887

    http://www.youtube.com/watch?v=-gtBOJXUi60
    its moving now ..19800Hz PWM, 19200baud, kp=5 :)
  3. Frakk

    Frakk Active Member

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    Re: PICMICRO 16F887

    Good job!

    Do you program this in assembly language or use a C compiler?
  4. kubing

    kubing Member

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    Re: PICMICRO 16F887

    i can say 60% in BASIC, 40% in ASSEMBLY, more efficient that way i think..working on Kd term now...but as u can see Kp =5 more than enough for fun..about 2 month debugging n experiment almost done now. thank you frakk for your PID advice before. :yes:
  5. dhweizel

    dhweizel New Member

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    Re: PICMICRO 16F887

    good job !!!!! keep the work on the kd term and you can almost double the kp term and everything will be much more violent :)
  6. kubing

    kubing Member

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    Re: PICMICRO 16F887

    [​IMG]
  7. dhweizel

    dhweizel New Member

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    Re: PICMICRO 16F887

    it seems conservative but may be is only in the simulation, the whole idea is to increase de p term to saturate the output most of the time and overshot and oscillate a lot, and to use de d term to brake ant the end and avoid the oscillation, the shape of the curve must be more like an s
  8. kubing

    kubing Member

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    Re: PICMICRO 16F887

    i dont have matlab in my pc, i used excel instead..that how they look so conservative... u can see duty(pwm) start to give u negative value when error(current) = error( previous).. at this point my controller shift their pos to reverse softly...in other word the are braking not to over shot. :yes:
  9. kubing

    kubing Member

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    Re: PICMICRO 16F887

    my polulu motor driver has arrive..gonna shake my table in a few day. working hard on PID code now.
  10. pathetic

    pathetic Member

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    Re: PICMICRO 16F887

    I am following your topic.
    Good work ;)
  11. kubing

    kubing Member

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    Re: PICMICRO 16F887

    working on small board now..
  12. kubing

    kubing Member

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    Re: PICMICRO 16F887

    source code for this project has been upload in my blog.. microcontroller lover are welcome. :)
  13. kubing

    kubing Member

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    Re: PICMICRO 16F887

    [​IMG]

    stress test..never do this at home :)
    http://www.youtube.com/watch?v=rR7g9RvBwT8
  14. Frakk

    Frakk Active Member

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    Re: PICMICRO 16F887

    Good job Kubing, but I don't see any stress here. :D
  15. kubing

    kubing Member

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    Re: PICMICRO 16F887

    wiper motor quite hot to touch...haha. :lol:,
    BTW
    I woul like to thanks to :
    sirnoname (without X-sim it could be nothing)
    Thanos ( Your Hbridge make my wiper move)
    ps: i only use irfz44n :)
  16. kubing

    kubing Member

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    Re: PICMICRO 16F887 (adjustable kD)

    Now with adjustable kD pot...
    [img600px][​IMG]

    [/url][/img600px]
  17. whaleman

    whaleman Member

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    Re: PICMICRO 16F887

    Hello kubing,
    You may remember my problems with Pololu VNH2SP30 and AMC. I see your motor controller works fine with Pololu and it seems to be very easy to build! After regaining my motivation to continue with electronics, I’m keen to give it a try. I have some questions before I start to order components.
    First programming, when it’s being programmed, doesn’t it need some button or a jumper to be turned on to allow programming? Or is it the same button which is used during checking kp and kd values via hyperterminal? I assume Ponyprog can be used for programming as with AMC?
    As I googled MAX232 wiring diagrams, I found few little bit different ways to do it. Also you have a MAX232 diagram on your webpage with diy gear indicator instuctions. One difference I see is that your diagram has four 10uF capasitors and for example Maxim datasheet (pic 2) uses 1uF capasitors instead. Does it matter which capacitance value to use?

    max232_kubing.JPG
    max232.JPG
    max232_sdiy.JPG

    Also one instruction (pic 3) didn’t connect 9pin connector's pins together as in your instuction advice.

    Of course a quite simple solution would be to use a USB ftdi cable, but also a bit more pricy. Either way, costs would be impressive low for your controller. Thanks in advance!
  18. kubing

    kubing Member

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    Re: PICMICRO 16F887

    go to OLIMEX board with FTDI chip. AS my test so far MAX232 are not LM7805 friendly.
  19. whaleman

    whaleman Member

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    Re: PICMICRO 16F887

    Okay, I'll try to find olimex board and if not, just use a standard USB ftdi cable with a regular diy board. I'll get back to business as soon as I have something done.
  20. kubing

    kubing Member

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    Re: PICMICRO 16F887

    you can use max232 circuit like shown in my gear indicator. Just make sure your picmicro is powered by USB 5V and problem only occur when I try to power my controller using wall adapter (with Lm7805)..btw i use vista 32bit. And everything working great till now :D