Hello. Yesterday I unassemble an old scanner and retrieved a nice Mitsumi M35SP-7T stepper motor (datasheet: http://www.mitsumi.co.jp/Catalog/pdf/motor_m35sp_7_e.pdf).
After spending half of my day just trying to find out how to use it with the Arduino (which in my case involved learning what a stepper is and how it works and all of the different kinds of steppers), I was finally able to setup a working circuit based on Tom Igoe's explanation found here: http://arduino.cc/en/Reference/StepperUnipolarCircuit. Here is my circuit:
It is working, I would say, but the thing is that the stepper is too weak (Sorry about the lack of proper technical term). From what I've read, I believe I have to connect the stepper to an external power supply, but I could not find any reference on how to do that and I'm afraid of doing it wrong and destroying my Arduino. What I thought about doing is this:
Is this correct? Or lucky me I didn't try.
Any help is greatly appreciated. Thanks a lot for your time, Cassiano