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Re: (ATM) Need a data sheet
I got the following wiring diagram from H&R with the motor:
<html><pre>
Green
------------
0
0
White 0
------------
0
0
Blue 0
------------
0 0 0 0 0 0
| | |
| | |
| | |
Red | Black| Yel |
| | |
| | |
</html></pre>
This matches up nicely with santryl's comments below. So I should tie
the black and white together then tie them to +12v. The circuit
diagram matches up with Mel's motor: it shows red/white, red, green and
green/white leads. Can anyone map my green, blue, red and yellow leads
to them? That way I can figure out which pins to tie to which leads.
This is a great project, by the way, to learn about steppers and a nice
intro to astrophotography. I highly recommend that you take a look at
the url where I found this - it's well written, and the project is
really cheap and easy to build.
The url is
http://www.u-net.com/ph/mas/projects/scotch/scotch.htm
Thanks,
Bob Bond
>From: mbartels@efn.org (Mel Bartels)
>Date: Wed, 27 Sep 95 00:40:20 PDT
>Subject: Re: (ATM) Need a data sheet
>
>The black and white leads coming from the stepper motor both tie to the
>voltage in line, leaving 4 leads to go to the stepper windings (red,
>red/white, green, green/white).
>Regards, Mel Bartels, Springfield, Oregon, USA
>mailto:mbartels@efn.org
>http://www.efn.org/~mbartels/
>
>From: santryl@cadvision.com
>Date: Wed, 27 Sep 1995 08:52:25 -0600
>Subject: Re: (ATM) Need a data sheet
>
> Hello Bob. The way that some of the motors are wired is that two
>of the coils have a common lead, instead of all four having a common
>lead. If you do not have an ohmmeter of some sort, now is the time
>to purchase one. If you do, you will discover (I hope) that there
>are two pairs of wire groups. Take your meter and read across any
>two leads. If you get a reading, remember it. If not, pick another
>pair. You should find that you can figure out which lead is the
>common as it will have a resistance of x to two other leads, whereas
>reading across those two other leads will have a value of 2x.
>Connect the two "centre" wires to form the fifth common wire. Each
>of the other four wires will go to one of the outputs. You can
>figure out the order by applying a voltage across the common and any
>lead. Progress to another. You want the motor to jump one step in
>order in the same direction each time. If the motor goes the wrong
>way or freezes, try again until you can progress from wire to wire
>and get constant motion.
> I wish I could help you with the pin-outs or a data sheet, but I
>use the SAA1042 as my stepper driver chip. However, if no-one else
>provides you with one in the next while, I will see what I can do. I
>would be interested to see what it does and if there would be any
>advantages to switching to it.
> Clear skies!
> MK