stepper motor control driver uno R3

hi guys.
im new arduino , have uno r3 board,controlling 200 step, 12vdc,  0.4a stepper motor l293n driver assisted bd139 transistors.
my aim control speed, step amount , delay in-between steps label application m/c. (labels coming off roll)'all controlled knobs (pots).later suppose i'll have add sensor read label postition (optical sensor)but ill leave alone. 
i'v been playing around , trying, following jigs on net. cant find me started, still alot of greek me. i'v managed going-

[code

code: [select]


#include <stepper.h>

const int stepsperrevolution = 200;  // change fit number of steps per revolution
// motor


// initialize stepper library on pins 8 through 11:
stepper mystepper(stepsperrevolution, 8, 9, 10, 11);

int stepcount = 0;  // number of steps motor has taken

void setup() {
}
  // nothing inside setup


void loop() {
  // read sensor value:
int sensorreading = analogread(a0);
  // map range 0 100:
int motorspeed = map(sensorreading, 0, 1023, 0, 100);
  // set motor speed:
  if (motorspeed > 10) {
    mystepper.setspeed(motorspeed);
    // step 1/100 of revolution:
    mystepper.step(stepsperrevolution / 100);
  // set motor delay 2 sec
   mystepper.step(stepsperrevolution);
delay(2000);
  }
}
][/code]

pls appreciated
artios

you need tell happens when try code.

post link datasheet stepper motor.

give details of power supply motor (volts , amps).


the l298 poor choice driving stepper motors. have @ stepper motor basics

...r

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