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First you need a motor driver IC.I mean which contain transistors to switch high current into the steppers windings.
If you are using unipolar ones the best choice is ULNxxxx,UDNxxxx.
If you are using bipolar ones,you need H-Bridges as used at DC motors.
Theres a lots of info on the web on how to connect them and how to drive them.
If you want to use full and half stepping then its easy.But if you want to use microstepping you have to drive them specially.Its easy to find theories on the web but i couldnt find any practical examples for unipolar microstepping.
So summing up: need a proper drive sequence and a transistor IC.
search the google:
- determining stepper motor leads
- Jones stepper motor basics
- stepper motor drive sequence
- (and similar)
PS:if you want microstepping i cant help you because i am still experiencing errors in my microstep drive.
Stepper Motor Driver https://www.avrfreaks.net/index.php?module=Freaks Academy&func=viewItem&item_id=65&item_type=project
This program is designed for the Atmel 4433. It controls any 2 winding unipolar stepping motor with a center tap for each winding. (These motors are abundant in old printers and office machinery) It utilizes the A-D converter combined with a 10k pot to control the speed of the motor. It also uses two buttons connected to the digital input pins to control forward/reverse and enable the vibrate function. This program uses no interrupts and is programmed in a down and dirty get the job done style. There are comments however. Note : the output pins on the avr chips will not drive a stepping motor by themselves, so you must use a fet or transistor of some sort to actually drive the motors. Its also nice to put an led on the pins so you can see which pins are being powered when. There is a jpg picture of the circuit on a breadboad for anyone who wants to reproduce the setup.
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