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Old 02-25-06, 09:10 PM   #1
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Basic stamp

How well do the BASIC stamp units from Parallax or products of the like work for driving stepper motors?
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Old 02-25-06, 09:24 PM   #2
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Old 02-25-06, 09:39 PM   #3
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Yeah, I think phantomcow should find a forum that is more suited to his inquiries.
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Old 02-25-06, 09:41 PM   #4
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I usually get a reply When I have a question like this, I post them here as well as another forum, but I like the crowd here
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Old 02-25-06, 09:46 PM   #5
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- carefully examine language grammar and features before investing in such a system...

- i'd prefer C or lower-level I/O controls, although BASIC can work well for rapid prototyping...

- Linux is supported by parallax dev system:

http://bstamp.sourceforge.net/
http://www.parallax.com/dl/sw/bs/unix/stampbc124.tgz
http://www.parallax.com/dl/sw/bs/unix/pbcompiler.tgz
http://www.parallax.com/dl/sw/bs/unix/lib.tgz

(most of my [limited] experience is with DragonBall (uCLinux), and PIC-based CPUs; others may want to chime in here)
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Old 02-25-06, 09:50 PM   #6
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http://forums.parallax.com/forums/de...x?f=5&m=111652

Haha, found ya! Sorry, I'm just a little bored
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Old 02-25-06, 09:51 PM   #7
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Quote:
Originally Posted by linux_author
- carefully examine language grammar and features before investing in such a system...

- i'd prefer C or lower-level I/O controls, although BASIC can work well for rapid prototyping...

- Linux is supported by parallax dev system:

http://bstamp.sourceforge.net/
http://www.parallax.com/dl/sw/bs/unix/stampbc124.tgz
http://www.parallax.com/dl/sw/bs/unix/pbcompiler.tgz
http://www.parallax.com/dl/sw/bs/unix/lib.tgz

(most of my [limited] experience is with DragonBall (uCLinux), and PIC-based CPUs; others may want to chime in here)

Thanks Linux_Author! This is the type of post that makes me ask questions here also.
I am in no big rush to get this done, going to do a lot of investigating before I settle for something. Thanks for those links, I will look them over
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Old 02-25-06, 09:52 PM   #8
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Quote:
Originally Posted by Taerom
http://forums.parallax.com/forums/de...x?f=5&m=111652

Haha, found ya! Sorry, I'm just a little bored
Heh, yep. I posted something similar on CNCzone as well...
Often though, I get my most useful answers here.
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Old 02-25-06, 10:37 PM   #9
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I know very little about what you are asking for, but here is a link that I found searching on yahoo. Seriously, I'm that bored. I'm doing searches for crap that I know nothing about and don't care about. It probably won't help you, but I'm bored, so entertain me

http://www.me.umn.edu/courses/me2011...ialstepper.pdf
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Old 02-26-06, 01:38 AM   #10
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I personally prefer PIC or Motorola HC11 series. Which reminds me -- I haven't done a project in a while. I really need to build my robot mower before winter ends. (And since I'm in Austin, that's happens on Thursday.)
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Old 02-26-06, 05:47 AM   #11
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WOW! I click on this thread thinking "There's no way that someone started a thread about the BASIC stamp." I figured that this was about standard postage stamps. Apparently, I was completely wrong.

I'm taking a digital/analog electronics class this semester and we're using the BASIC stamp for our labs. I really can't answer your question as to how well they work right now, but I will leave you with a quote from my professor: "The stamp is cute and huggable". Hope this helps with your decision.
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Old 02-26-06, 08:24 AM   #12
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Yea i've been told for one person that this unit will not be fast enough to drive my steppers around. I will only be microstepping at 1/4 but still...
RedHairedScott, doy ou kmow if the PIC can handle this okay? And if the amperage will be a problem?
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Old 02-26-06, 04:41 PM   #13
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I can't imagine that you'd want a motor to be faster than a Stamp, but I guess it's possible. You can get high-speed PICs, but I think you can get higher-speed anything. And unless you've got a chip designed especially for the job, you'll probably want your motor drivers as separate units, depending on their size. I'm a big fan of standalone H-bridges for that sort of thing.

I'm not sure what sort of power you're looking at driving, but the spec sheets for whatever brain you decide to go with will have maximum power ratings for the output pins. Even if you're driving small loads you may want to use one of the cheap "hex inverter" chips to keep your $expensive brain chip away from motors, which tend to be electrically messy. It's easier to replace a 50-cent hex inverter chip than your $40 processor.

Of course, I'm just pretending I know what I'm talking about. I do processors for a living; my wild hedonistic days of robot design are far in my past.
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Old 02-26-06, 05:33 PM   #14
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WEll I would want a separate unit for each motor, so eventually 6. 3 to begin.
As for input voltage, I want this to be able to handle 40v at least, 50 would be ideal.
Since steppers lose torque with an increase in speed, more voltage makes that point in which the stepper loses torque much later in a graph.
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Old 02-26-06, 06:06 PM   #15
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Quote:
Originally Posted by Taerom
Yeah, I think phantomcow should find a forum that is more suited to his inquiries.
Or perhaps you guys should just stop clicking on phantomcow's posts...you know they're not about bicycles!
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Old 02-26-06, 07:11 PM   #16
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Quote:
Originally Posted by phantomcow2
How well do the BASIC stamp units from Parallax or products of the like work for driving stepper motors?
I've done it before; it's not that tough. I ran it through some other circuitry, though, which escapes me at present...
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Old 02-26-06, 07:15 PM   #17
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I've done it before; it's not that tough. I ran it through some other circuitry, though, which escapes me at present...
You have? This is good.
Were you able to run the steppers fast, put in some good voltage? I want to be be able to put in 28vDC no problem, 50vDC would be even better
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Old 02-26-06, 07:54 PM   #18
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When I did this kind of a thing, I used a Motorola MCHC11.

I've never used a Basic STAMP, however, from what I've heard of them, I think they are designed for little projects like this. So is the PIC. You might want to try to look at and compare the two to see if either look "better" suited to your task. But I'd guess either would be sufficient.
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Old 02-27-06, 01:54 PM   #19
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Quote:
Originally Posted by Taerom
Yeah, I think phantomcow should find a forum that is more suited to his inquiries.
Well, I like to think I have helped out PC a few times. He's a sharp guy and I enjoy his questions!

...and there's a lot of smart people with diverse areas of knowledge here.

As for basic stamp...I'm not sure how steppers are driven. You can use the stamp to control another device, based on measured inputs.

I've used them to control a servo based on a 4-20 mA input.
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Old 02-27-06, 05:14 PM   #20
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Quote:
Originally Posted by eubi
Well, I like to think I have helped out PC a few times. He's a sharp guy and I enjoy his questions!

...and there's a lot of smart people with diverse areas of knowledge here.

As for basic stamp...I'm not sure how steppers are driven. You can use the stamp to control another device, based on measured inputs.

I've used them to control a servo based on a 4-20 mA input.
Thanks for the words Eubi! Indeed, you've helped me out several times.
You state the reason why I post my technical questions in bike forums, I've found a very diverse and intelligent knowledge bank, unlike any other forum I post on.

Turns out the basic stamp will struggle to keep up with the demands my motors will place. After microstepping, i am looking at up to 10,000 steps per second.
So now my friend is looking at a PIC based design. Using transistors that are stacked to take up the amperage my motors demand, around 6. Then we use resistors to limit the current, to fine tune
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Old 02-27-06, 05:15 PM   #21
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ANd in return I will do his chemistry labs, machine parts for his CNC engraver, and give him some very fine THk linear slides for his Z axis
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Old 02-27-06, 06:26 PM   #22
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I would think even a 1 or 2 mhz micorprocessor could handle outputting a signal @ 10khz.
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