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I forgot to mention that with an Arduino, you can contrly MOSFETs to drive the stepper motor directly, sorry!!

Maybe someone has already developed code that you can use or adapt.

As your motor has 4 connections, that is a BIPOLAR Stepper Motor. Not a Unipolar!!! Never forget that!!

Its easy to identify both coils simply by using an Ohmeter on Ohms. Each coil will have two connections, label them coil A and coil B. If the motor ever drives the "wrong" direction, you only need to reverse the connections to ONE COIL ONLY!

Sorry that I forgot so much.....

regards

Andy

Yes, Andrew is correct.  Referring to this diagram might help you understand better: http://www.robotgear.com.au/Cache/Files/ProductImageOriginals/679_Bipolar%20stepper%20motor%20wiring%20diagram.jpg  You can use the continuity function of a multimeter to identify the wires.

Im actually trying to follow this instructible: http://www.instructables.com/id/Pocket-laser-engraver/ this is my first project with an Arduino or any type of a micro controller but i thought it would be a good prelude to building a full size cnc router, anyways i can identify the two seperate coils on the motor but how do i know which is contact is a, c, d, b? i tried applying voltage (first 3.5 V then 5V) to each one of the coils but i got no movement out of them, also i thought that dvd drives run or 5v instead of 12v so i will try applying 12v tomorrow, if it burns out then too bad i can always salvage another motor out of a different drive. I was also think about just running some g code to the controllers so it would be constantly putting out a signal to the motor and breadboarding my easy driver so i could easly plug in the wires from the motor and just try different combinations im just afraid of damaging the driver board so please let me know if thats a bad idea. i will try to get  apicture of my motor as soon as my camera charger comes in as i lost it on vacations and my battery died compleatly, once again thanks for all the great help!

Stepper motors ONLY understand a complex sequence of pulses, on one or the other coils in either of two directions, you cannot drive them with DC power!! You may just burn out a coil and destroy the motor completely.....

TIP. Never apply power to something you don't understand.......it can even be dangerous to you personally, but not in this case, it was only dangerous to the motors......

There are no contacts in a stepper motor.

A picture is unlikely to help further.

Look for tutorials and the like on the web, read before proceeding further.....

Best wishes.

Andy

Hi, what is the   pin number ATMEGA328P-PUATMEGA328P-PU  input power, and ground, I have connect output 0 led positive, and ground negative, how connect correct wire to atmega's pins?, final led blinked.

Thanks for answer

Bye

You should download yourself an Arduino board schematic so you can see what goes where.The design files (.pdf and Eagle) can be downloaded from here:

http://arduino.cc/en/Main/ArduinoBoardUno

Hi,

I was wondering if there is a way to use a barcode scanner to display the information using an arduino to a lcd screen. W/O using a computer.

Thanks

Hello, I have an Arduino Uno and would like to get advice on the following project: I would like to control two DC motors so they have the same speed. I'm thinking about using Hall sensors to measure RPM, but perhaps there are other ways? The control needs to be in the area of 3600 RPM each motor.

Thanks, Flywheel

What program would I use to open an .sch file downloaded via Jeremy Blum's arduino tutorials?

Thanks

That sounds possible.  You could use this (http://www.sparkfun.com/products/9166) on a device with USB host support, such as the chipKIT arduino.