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Basic Electronics » Unipolar Stepper motor with ULN2003A,

February 11, 2013
by Ralphxyz
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Here is the circuit:

Here is the ULN2003A specsheet

I have a 6 volt unipolar stepper motor.

Now my first question is should I have 6 volts going to COM, Stepper motor supply?

That is what it seems like I should have, that means the end coil wires will be pulled low correct, when the motor runs?

In looking at the ULN2003A specsheet I do not see how the outputs would be low so that is why I am asking.

Thanks for the help, am I missing anything?

Ralph

February 11, 2013
by Ralphxyz
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Well that works!!

6 volts to COM with common ground between the mcu and the stepper motor.

Ralph

February 11, 2013
by dvdsnyd
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Ralph, What are your plans for the stepper motors?

February 11, 2013
by Ralphxyz
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I had always wanted to make up a XYZ table, but since I have a CNC/3D printer on order

I do not need to do that now.

Probable one the first thing I am going to make is a solar tracker I got a bunch of 8.5 degree steppers off a site for $.90 apiece so I have a lot to play with.

This specific application was for a Peristaltic pump. The pump is missing the cover, I'll make one up with my 3D printer. Possible with the cover and electronics and tubing I'll see if I can sell them on ebay. I think I should be able to sell them for $150.00. Peristaltic pumps are being bought every day so any one who wants a precise metered flow might be interested.

I'll start a new thread about the encoder.

Ralph

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