Controlling a stepper motor

To drive a stepper motor you need a source(i used my computer's power supply 12V), an IR receiver(i get one from a bad DVD-player) , a stepper motor, an ULN2003A Darlington Array , IR remote controller (i used an IR of an old Sony amplifier) , a FET(i used IRF 540N), a breadboard and  Arduino. You have to hook up like this.

Next thing the program. I learned from arduino.cc and from forums to write this program, and this works.

It looks like this:

int ir_pin = 2;               

int led_pin = 13;               

int debug = 0;               

int start_bit = 2000;           

int bin_1 = 1000;             

int bin_0 = 400;

int max_count=200;

int count=0;

int min_count=20;                

#include <Stepper.h>

#define STEPS 100

Stepper stepper(STEPS, 8, 9, 10, 11);

int val=0;

void setup() {

  pinMode(9,OUTPUT);

  pinMode(led_pin, OUTPUT);       

  pinMode(ir_pin, INPUT);

  digitalWrite(led_pin, LOW);      

  pinMode(4,OUTPUT);

  Serial.begin(9600);

}

void loop() {

int key = getIRKey();       

  Serial.print("Key Recieved: ");

  Serial.println(key);

  Serial.println(count);

  stepper.setSpeed(count);

 

 

  if (key==21){

    Serial.println("POWER ON");

    digitalWrite(4,HIGH);

    delay(90);

  }

  if (key==184){

    Serial.println("POWER OFF");

    digitalWrite(4,LOW);

    delay(180);

  }

  if (key==1680){

    val=val+500;

    digitalWrite(4,HIGH);

  }

  if (key==1681){

    val=val-500;

    digitalWrite(4,HIGH);

  }

  if (key==52){

    count=count+20;

    delay(90);

    if (count > max_count){

      count=200;}

  }

  if (key==51){

    count=count-20;

    delay(90);

    if (count < min_count){

      count=20;}

  }

  if (key==176){

    digitalWrite(4,HIGH);

    val=-100;

  }

  if (key==177){

    digitalWrite(4,HIGH);

    val=100;

  }

  stepper.step(val);

  val=0;

  digitalWrite(4,LOW);

}

int getIRKey() {

  int data[12];

  digitalWrite(led_pin, HIGH);      

  while(pulseIn(ir_pin, LOW) < 2200) {

  }

  data[0] = pulseIn(ir_pin, LOW);   

  data[1] = pulseIn(ir_pin, LOW);

  data[2] = pulseIn(ir_pin, LOW);

  data[3] = pulseIn(ir_pin, LOW);

  data[4] = pulseIn(ir_pin, LOW);

  data[5] = pulseIn(ir_pin, LOW);

  data[6] = pulseIn(ir_pin, LOW);

  data[7] = pulseIn(ir_pin, LOW);

  data[8] = pulseIn(ir_pin, LOW);

  data[9] = pulseIn(ir_pin, LOW);

  data[10] = pulseIn(ir_pin, LOW);

  data[11] = pulseIn(ir_pin, LOW);

  digitalWrite(led_pin, LOW);

  if(debug == 1) {

    Serial.println("-----");

  }

  for(int i=0;i<11;i++) {         

    if (debug == 1) {

      Serial.println(data[i]);

    }

    if(data[i] > bin_1) {         

    data[i] = 1;

    }  else {

    if(data[i] > bin_0) {       

      data[i] = 0;

    } else {

     data[i] = 2;             

    }

    }

  }

  for(int i=0;i<11;i++) {         

    if(data[i] > 1) {

    return -1;                

    }

  }

  int result = 0;

  int lastresult=0;

  int seed = 1;

  for(int i=0;i<11;i++) {         

    if(data[i] == 1) {

    result += seed;

    }

    seed = seed * 2;

  }

    return result;                

}

I hope i gave a good alternative of stepper motor controlling.