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From: Nobody on 3 Jun 2010 12:25
Like others suggested, you maybe driving it too fast, but 0.1 or more delay
is long enough. In many steppers you have to start slowly then gradually
increase the speed, such as starting with one revolution per second then
increase the speed.

It maybe also a hardware issue. At the end of the cable, the square wave
becomes like a saw tooth wave at the end of the line due to capacitance on
the line. The solution is to use something like 74LS244, or 74LS04 to
straighten out the signal. The later would invert the logic, but you can
compensate for that in software.



From: Nobody on 3 Jun 2010 12:36
"Nobody" <nobody(a)nobody.com> wrote in message
news:ewA5klzALHA.4388(a)TK2MSFTNGP04.phx.gbl...
> It maybe also a hardware issue. At the end of the cable, the square wave
> becomes like a saw tooth wave at the end of the line due to capacitance on
> the line. The solution is to use something like 74LS244, or 74LS04 to
> straighten out the signal. The later would invert the logic, but you can
> compensate for that in software.

I forgot to say that some chips' input look for a transition, between 0 to 1
and vice versa, but if the transition is too slow, the input may not see it,
so it's necessary to use something like 74LS244 to make it look like a
square wave again...


From: Henning on 3 Jun 2010 12:58

"Jeff Johnson" <i.get(a)enough.spam> skrev i meddelandet
news:hu8j27$4ck$1(a)news.eternal-september.org...
> "Charlie" <Charlie(a)discussions.microsoft.com> wrote in message
> news:582DEE68-38EA-4AE5-88D2-8A9D3C71FB4C(a)microsoft.com...
>
>> Good explanation. It would be nice if the motor could send a signal
>> (close a
>> circuit, whatever) that would tell the program when the rotor had
>> completed
>> it's travel to the next quadrant, thereby allowing a "hand-shaking"
>> method of
>> synchronizing the device and software. I presume such motors exist.
>>
>> P.S. "To" is spelled with two o's when used in this context: "too long",
>> "too short", "too slow", etc. ;)
>
> P.P.S. "Its" is written without an apostrophe when used as the possessive
> form of "it." "It's" is ALWAYS the contraction for "it is."
>

Whos is this, it's its. ;)

/Henning


From: Steve on 3 Jun 2010 13:17
On Jun 3, 11:16 am, Charlie <Char...(a)discussions.microsoft.com> wrote:
> Good explanation.  It would be nice if the motor could send a signal (close a
> circuit, whatever) that would tell the program when the rotor had completed
> it's travel to the next quadrant, thereby allowing a "hand-shaking" method of
> synchronizing the device and software.  I presume such motors exist.
>
> P.S. "To" is spelled with two o's when used in this context: "too long",
> "too short", "too slow", etc.  ;)

Yeah my brain was moving faster than my fingers is all.

Steve
From: Steve on 3 Jun 2010 13:18
On Jun 3, 11:51 am, "Jeff Johnson" <i....(a)enough.spam> wrote:
> "Charlie" <Char...(a)discussions.microsoft.com> wrote in message
>
> news:582DEE68-38EA-4AE5-88D2-8A9D3C71FB4C(a)microsoft.com...
>
> > Good explanation.  It would be nice if the motor could send a signal
> > (close a
> > circuit, whatever) that would tell the program when the rotor had
> > completed
> > it's travel to the next quadrant, thereby allowing a "hand-shaking" method
> > of
> > synchronizing the device and software.  I presume such motors exist.
>
> > P.S. "To" is spelled with two o's when used in this context: "too long",
> > "too short", "too slow", etc.  ;)
>
> P.P.S. "Its" is written without an apostrophe when used as the possessive
> form of "it." "It's" is ALWAYS the contraction for "it is."

GEEZ guys give me a break already...I left grammar school a long time
ago <g>

Steve
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