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  1. #21
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    vladdy,
    Just sketching it out, listing attached, haven't checked it against pin numbers, and half stepping. Really forming ideas for a basic start.

    Phil

    Free smal Basic compilier for AVR's:
    http://www.mcselec.com/bascom-avr.htm

    Attached Files Attached Files
    Phil, Still too many interests, too many projects, and not enough time!!!!!!!!
    Vist my websites - http://pminmo.com & http://millpcbs.com


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    Default AVR project status?

    Phil,

    Are you still working on this project?
    I'm interesting in learning microcontroller too.
    I had coded something similar to yours but on an AT90S8515 (coded in assembler). I was able to simulated it on the STK500.

    Please let me know how this project goes.



  3. #23
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    Kind of,
    I sent a blank board to Ito Brazil (cnc zone handle) a couple of weeks ago. I actually in the last couple of days have started looking at it. I had stolen the FET's for the L297uniboard prototype and ordered a different Mosfet for this avr board which I now have, I'm looking at the half step code also. Will keep you posted.

    Phil, Still too many interests, too many projects, and not enough time!!!!!!!!
    Vist my websites - http://pminmo.com & http://millpcbs.com


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    hows this Going Phill? Im looking for some drivers that can run @ 55V dc. I like the DYI world.

    thanks



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    Wink H bridge drivers for bipolar steppers

    Look at the IR2010 H bridge drivers.
    They can drive most FETs
    Voltages to 200 volts
    Directly interface to microcomputers
    Can be bootstrapped so no high voltage supply source is needed.

    http://pdf.alldatasheet.co.kr/datash...RF/IR2010.html

    There are a number of other H bridge drivers with similar performance

    Add current chopping and you have a high current - high voltage bi-polar driver.



  6. #26
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    Hi guys,
    Teckno,
    Actually I'm in work on a expanded version of the AVR board on the first post. 100V, unipolar, heavy current (can't say yet, the FETS are more capable than the board will be) microstepping. The unipolar will come first as the hardware is almost ready to order protoboards on. Microstepping has been the hurdle to implement in a low cost, KISS design, but that too I believe is not an issue, at least to 1/8th step.
    Also in parallel is a bipolar design.

    BCwandererer, I'm familiar with the 2010, 2104, etc. Right now I'm playing with P channels on the top side though. Their simpler, their cost too implement is less, 120V 14A Pchannels don't cost much these days and their pretty robust.

    Both designs are limited to 100V.

    Phil, Still too many interests, too many projects, and not enough time!!!!!!!!
    Vist my websites - http://pminmo.com & http://millpcbs.com


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    Default Unipolar microstepper design

    I would like to contribute some ideas for a unipolar, pic18252 based design.
    I have been working on the board design.
    I have not started coding as I have been working on the layout.
    The microproccesser is a pic18252 because I have some on hand.
    Resonator is 20 mhz
    I am driving the FETs with a high current driver chip.
    Microstepping will be by using a resistor ladder with 4 micro outputs to input into the comparator that controls the current in each leg.

    The board layout is still under review as there may be some bypass caps to add. Values of resistors on the layout are not right. They will be fine tuned when calulated.

    When the unipolar unit is working, a bipolar unit will use similar coding.

    I am throwing it out for ideas.
    Maybe someone has done this before and has ideas that will shorten the learning curve.

    Layout and schematic attached (forgive the non-technical layouts - I am still new at this)

    Schematic reloaded in larger size

    Attached Images Attached Images
    Last edited by BCwanderer; 01-03-2006 at 01:06 PM. Reason: Clearer pictures


  8. #28
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    BCwanderer,
    I can't read your schematic can you enlarge it?

    Phil, Still too many interests, too many projects, and not enough time!!!!!!!!
    Vist my websites - http://pminmo.com & http://millpcbs.com


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    Sweet. are you planiing on a chopper board or resisters? and or are you going to expand this to Bipolar.

    Sorry I havent replyed just been a lerker of late.

    Tek

    Quote Originally Posted by pminmo
    Hi guys,
    Teckno,
    Actually I'm in work on a expanded version of the AVR board on the first post. 100V, unipolar, heavy current (can't say yet, the FETS are more capable than the board will be) microstepping. The unipolar will come first as the hardware is almost ready to order protoboards on. Microstepping has been the hurdle to implement in a low cost, KISS design, but that too I believe is not an issue, at least to 1/8th step.
    Also in parallel is a bipolar design.

    BCwandererer, I'm familiar with the 2010, 2104, etc. Right now I'm playing with P channels on the top side though. Their simpler, their cost too implement is less, 120V 14A Pchannels don't cost much these days and their pretty robust.

    Both designs are limited to 100V.




  10. #30
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    tekno,
    if the question is to me, they are chopped.

    Phil, Still too many interests, too many projects, and not enough time!!!!!!!!
    Vist my websites - http://pminmo.com & http://millpcbs.com


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    THanks Phil it was to you.. sounds like a sweet idea. I have been thinking of how to make a Power Supply since I read this.

    Quote Originally Posted by pminmo
    tekno,
    if the question is to me, they are chopped.




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    HI, very new to this cnc idea but would like to know if anyone has built a controler ussing the Alegro a3983 driver chip, if so do you have a circuit diagram and board layout and how did you cope with the heat disipation. I was thinking of mounting it upside down and gluing or soldering a heat sink to it.



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    Default Can't Believe AVR on cnczone forum...

    I just bought the Butterfly proto board about a month ago with the c programming manual kit. Thought about doing a cnc system with it . I joined the forum and being a linux user went right to the open source after introducing myself... Was wondering where this section of the forum was heading and if AVR Butterfly could be of help... They are cheap and I am thinking about buying em for christmas gifts.



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