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you plug your probe to in Line in, make sure you set your Soundcard Mixer properly as well.
In VA, Click on Settings>> In/Out Device to confirm your setings.
Trent, i can't tell, it worked for me awhile back, not sure about the current one...
EDIT seems that I had the same version... doesn't seems to bug here.
Last edited by mister_e; - 29th March 2008 at 00:21.
Steve
It's not a bug, it's a random feature.
There's no problem, only learning opportunities.
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Try resizing some of the windows. Maximize the main GUI then restore, then manually adjust it. Sometimes messes real bad. Same problems with the tool windows too, like for the voltmeter.Originally Posted by mister_e
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T Jackson "Your reference to the website incurred me to think you found this code rather than wrote it..."
You are right. I have copied this code directly off this website. That's why I am on this forum - because the website claims it works together with the circuit they provide, but I can't make that happen.
Having said that, I have found other sites where precisely the same circuit is used with similar code, so it seems that I am doing something wrong.
Mister-e - I can't make VA work either. I am not skilled in electronics, but expected to see a set of 6v steps if I put a probe on the output of this circuit and attached the ground to 0v. Instead, what I got was a sine wave. In fact, whatever I do, I seem to get a sine wave. The oscilliscope setup setup just seems to measure RMS or peak-to-peak - I can find no DC setting at all. When I turn the circuit on, the sine wave is interrupted by short pulses which decay to 0v rapidly, so if those are real I am failing to get a proper signal to the stepper coil, but since I can't even make the scope line jump up when I put 6v across the terminal I can't be sure that VA is working at all....
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Excuse me? I think you might have mistaken me for someone else my friend. I have made no references to any websites in this thread.
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Apologies for the confusion. What I meant to put over was:
I - refered to the website I got the stepper driver code I am using from (referenced in my first post.
You - said "Your reference to the website incurred me to think you found this code rather than wrote it..."
I - was trying to point out that I HAD found the code rather than created it.
However, I have now found out that no PC software-only scope using the sound card will provide a DC service, so I am no further forward...
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One other thing to look at is balance - if you scope is out of balance it will become hard to drive the scope in RA, especially if you are increasing the frequency of the steps as this provides less time to energise the coils in the stepper.
One thing to try is modifying the drive / code for a 4 step motor.
Found a pdf that explains the theory behind increasing speed and the drop off of tourque http://www.national.com/an/AN/AN-828.pdf
Last edited by malc-c; - 3rd April 2008 at 19:05.
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Bypass the coupling cap on the SND card and you'll have a DC scopeHowever, I have now found out that no PC software-only scope using the sound card will provide a DC service, so I am no further forward...
Last edited by T.Jackson; - 4th April 2008 at 06:36.
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There's always an old scope somewhere... a good ol' 20Mhz dual channel is still good enough for many purpose. Sure you can found one for ~50$ used. There's still some USB model available here and there... and finnally there's some PC card.
But.. hey wait a minute... sure you have a TV? You could try to build this one... based on PIC12F675
http://www.dos4ever.com/uscope/uscope_e.html
i always been amazed of that... never tested it though...yeah limited... but come on.. it's a PIC12F675!!!
Steve
It's not a bug, it's a random feature.
There's no problem, only learning opportunities.
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