Need Help! PICSTEP Testing

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    Smile PICSTEP Testing

    Is there a way to test a step motor and the PICSTEP V4 driver together for motor movement without being connected the interface card? I have my 36v power supply connected and a separate 5v power supply to driver the circuitry of the PICSTEP driver.

    Thanks

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    Gold Member doorknob's Avatar
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    My my my. I think that this just might do the trick.

    Thanks Dude!



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    Hi Doorknob,

    I built the tester. The tester outputs voltage pulses at the "Direction" lead and "Step" lead as indicated in the plans. Unfortunately the PICSTEP V4 did not respond. Can anyone help with the diagnostics of the PICSTEP V4 drivers?

    Things that I have done and confirmed, to the existent of my knowledge.
    1. Doubled checked the solder points.
    2. Check for voltages on the driver; 5V for PIC and and 35V for PWM.
    3. Confirmed the data on PIC.

    If anyone can guide me more, I would greatly appreciate it.

    Thanks in advance



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    Gold Member doorknob's Avatar
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    You are faster than I am! I decided to build the little tester board for myself yesterday, but I need another hour of work on it before firing it up.

    I do not have direct experience with the PICSTEP V4, but here are a few suggestions:

    1) Do you have the enable pin set to enable the driver?

    2) Are you sure that the PIC has been programmed?

    3) Is the PIC actually running? Is there some signal that you can test that would only be present if the PIC firmware is running?

    4) Are you certain that the pin numbering that you are using on the PMinMO interface header is correct, so that the step and dir signals that you are applying to the header are actually showing up on the proper PIC pins?



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    Do you have a schematic?



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    Smile

    Quote Originally Posted by doorknob View Post
    You are faster than I am! I decided to build the little tester board for myself yesterday, but I need another hour of work on it before firing it up.

    I do not have direct experience with the PICSTEP V4, but here are a few suggestions:

    1) Do you have the enable pin set to enable the driver?

    2) Are you sure that the PIC has been programmed?

    3) Is the PIC actually running? Is there some signal that you can test that would only be present if the PIC firmware is running?

    4) Are you certain that the pin numbering that you are using on the PMinMO interface header is correct, so that the step and dir signals that you are applying to the header are actually showing up on the proper PIC pins?
    Hi Doorknob,

    Well, I'm running a little on the fast side because of a few commitments that I have to keep. LOL I'm very very new to "hands-on" to this technology, even though I've read much about it, so be patient with me. Thanks!

    To answer your questions directly.
    1. Where is that pin? (Don't laugh...oh well laugh...I am). I'm using PMinMO's 5 axis board. JP6 and JP7. If you're speaking about JP7, which are jumped?

    2. Very sure. I verified it with the programmer that I built. I burned it, read it and confirmed that this is data on the chip with no conflicts.

    3. News to me. Don't know what I'm looking for. Can you help with that info.

    4. Well, this is a two part answer. I'm sure that the cabling is correct. I read on PMinMO site that the cable needed to twisted around and I confirm that by making sure that the 5v pin matched up. I use the BOB to power the 3 PICSTEP and through verification on each driver I have 5v feeding the circuit.

    So this is where I am with the boards. Hope to speak with you soon and thanks for the rapid response.

    Bye

    PS Are you or did you build PICSTEP V4 as well?
    PSS I'm in the process of getting a serial port cable (DB25). I have not connected to the computer yet. I live in the middle of the ocean and awaiting my cable's arrival. I want to workout the functionality logistics before the cable came.

    Last edited by cpeter; 10-19-2012 at 06:33 AM.


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    Quote Originally Posted by H500 View Post
    Do you have a schematic?
    To which circuit?



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    Gold Member doorknob's Avatar
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    1) According to the description of the PMinMO 10-pin interface connector at DIY Interface Technical Information, pin 1 is used for an enable signal, and you must set it 'low' (ground) to enable it.

    3) I have not built or used a PICSTEP controller, and so I'm not even sure where to find the schematic of the PICSTEP (that H500 was looking for). What is needed is to find some pin of the PIC that would be in one state if the PIC's clock was not running or the PIC was not actually executing code, and would be in a different state (or activity) with the firmware running. Without knowing more about which PIC is being used and how the firmware is using it, it is difficult for me to suggest what pin(s) that might be.



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    OK...I see what you mean. The schematic indicates at JP6 2 states; always enabled and through PIN14 of the DB25. Although I understand the schematic, seeing what it is you are explaining to me, I just don't understand the difference between the 2 states. I'll have to study more or just try them (blindly). WOW!

    Any idea what JP7 does?

    Forgive my questioning. I'm not a tech at all. I'm and architect who knows enough to get into trouble with electronics. LOL I've printed PCB by means of silk screening for the last 4yrs, drilling by hand (1000s of PCBs) and now need the assistance of a CNC.

    I saw some recent chat from Alan Garfield online. Maybe he'll will be able to shed some light on the PIC mapping. I'll try anyway.

    Thanks again.



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    Gold Member doorknob's Avatar
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    Can you post a link to the schematic to which you are referring?



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    Quote Originally Posted by cpeter View Post
    To which circuit?
    The picstep you built.



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