Sepper motor control WITHOUT motion controller

Hello
I am attempting to control two stepper motors in a blened motion move. I can currently drive one of the motors seperately and also change direction and speed.
I know there are motion controllers that can be used but they are unavailable to me as I am in college. (PLEASE NO ONE SUGGEST MOTION CONTROLLERS)
I know it maybe difficult but that is the way I have to do it. My plan is to use the motors in conjuction with a camera which acquires an image and I want the motors to follow the outline of what ever is in the image. The project is very similar to a X-Y Plotter except I will not be plotting anything, I just want the motors to move.
Thank you
Bye

Hello
I am using Labview 2010 with two RS stepper motors and I want to move them at the same time. There will be no circular motions just straight lines. The cooridinates that are to be supplied to the motors are acquired from an image processing VI. I am taking an image of a line which always leads to the centre of the screen. My plan is to have the motors follow that line.
I have included a VI that I am working on, it includes the image capture part of the program and then the co-ordinates for the motors to follow. These co-ordinates are designed to be used with a motion controller. I do not know how to use these co-ordinates to drive the motors without a controller.
Bye
Attachments:
Thres and Wand With Usb Camera.vi ‏111 KB

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Attachments:
PIDControl.vi ‏23 KB
BIOGROWTH.lvproj ‏46 KB

Hi Lawrence,
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Regards
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Attachments:
General PID Simulator.vi ‏22 KB

Position drift during the stepper motor controlled back and forth motion

Hi everyone there,
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Hey, Brian Beal,
Thanks for your quick response. "accel" and "decel" mean acceleration and deceleration, am I understanding right?
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Controlling ESP 300 motion controller via Labview

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LV 2011, Win7
Attachments:
Temp.zip ‏83 KB

Hi,
For some reason, the link you gave doesn't work ...
Sory I forgot the subVIs... here is the dll with everything. I didn't use the VIs from NewPort because the code was quite poor.
You can use th subVIs to :
- read axis position or informations
- send command to be executed
- send "question" and read the "answer"
It's quite easy to use because the VISA session will be help in the FGV (blue VI), use it to open the session at the beginning of your process, use it for controlling your axis and use it also at the end to close the VISA session.
Hope thi help
BTW : aboute the "\r" well yes it is required as an end of message character
When my feet touch the ground each morning the devil thinks "bloody hell... He's up again!"
Attachments:
ESP.llb ‏132 KB

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Hey Chen,
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I have been trying to develop an application using Labview 8.5. I need to control a motorized linear stage which uses the Leetro MPC08 PCI motion controller card. The manufacturer gave me example VIs which I configure to call "c:\windows\system32\MPC08.dll". About four months ago, I remembered that i tested them and they seemed to work somehow (but I did not finish the full test since i was busy doing other things). Nevertheless, when I got back to continue my development a few days ago, i just could not get the same old VIs to work. I could only get one library function of the card to work which is the "auto_set" which returns "4" which is the number of axes that the card can control. The next function I need to call is "init_board" but this one keeps returning "-3". The manual indicates that any negative number returned means there has been something wrong. I would guess it is "PCI initialization fails" but honestly do not know for sure. Can anyone help? My computer is a PC running windows XP.
Thanks in advance for any kind help offered.

Hi,
Wrapped VISA call means that the SubVI contains a set of VISA calls.
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Mark Ramsdale

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I am trying to control A Newmark Systems Motion Controller using Labview 8.5. The Model number is NSC-M4 and it connects to the computer using an RS-232 connection.
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And are VISA read/write commands the best way to communicate with this type of device or is there a better method than what I'm using?
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Hi Chris,
I am also programming a VI which control a 2-axis stepper motor of Newmark systems. I have managed to control the motion with VISA, communication is rs232. What I need is to simulate the motion of the device on VI. This is because I want to control the deice remotely, without actually seeng the response of the device. I thought this may be managed with the VISA read however, I couldn't manage it. This simulation might be a chart or graph, or I have 3D images of my device and it would be really great if I see the motion actually on these images.
How can I do that?
Thanks in advance.
Regards
Berk.

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Dear all,
I need to control a DC motor, which basicly has to rotate from -15 degrees to +15 degrees with changeable frequencies/time period.
The motor is used for inducing vibrations, thus the frequency and positioning must be (easily) controlled in LabVIEW.
My setup looks as follows:
cRIO 9082, NI 9514 C-Module, AKD Servo drive and an AKD DC Brushless motor.
Until this point i have used a "Contour move block - repetitive" for controlling the engine using a table, however, this doesn't allow me to configure velocity and acceleration etc. Furthermore, I don't know what units the block inputs are (radians, degrees, units/rotations whatsoever) - See pictures for details on diagram and setup.
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So, i short, i basicly want to:
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- Control the motor using a PID controller (not necessarily needed, but i would like the possibilty)
- Control the velocity, acceleration, deceleration and frequency/time period.
Thanks in advance - looking forward to some good answers!
Have a great easter holiday.
Best regards,
Jzaulich
Attachments:
Motion and error.PNG ‏20 KB
Project tree.PNG ‏22 KB

Hi Anders,
Thanks for your reply.
I have the softmotion module installed and working - thats not the issue.
However, at the moment i'm using the "countour move" example provided with the SoftMotion module.
It works fine, however, it doesn't allow me to change the system too much and the unit of the input is not denoted anywhere (radians, degrees, revolutions etc.).
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Best regards,
JZaulich.

How do I get labview for linux to send out ascii code to a motion controller?

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> would I go about programming something like this? I have heard of
> others doing things like this but I am unsure of how to program
> labview to send out ASCII codes to a PCI card to move motors.
Look in the manual to see get familiar with the sequences of codes you
need to write, and more importantly, where you write them to. I suspect
a memory location, but it could be a socket or port.
Each of these locations will have a slightly different way of accessing
it. Once you know, search devzone for how to do it on linux, or post
back here.
After you can send the codes to the right location, you probably want to
build a state machine that simplifies the interface and prevents certain
actions from taking place. Now determine which buttons or
keys perform
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I'm summarizing here assuming that you know what a state machine is and
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Greg McKaskle

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