stepper motor help me

my project light-sensitive automatic opening , closing curtains..stepper motor not stop after 90 degrees

code: [select]

// arduino example demonstrates bidirectional operation of
// 28byj-48, using uln2003 interface board drive stepper.
// 28byj-48 motor 4-phase, 8-beat motor, geared down by
// factor of 68. 1 bipolar winding on motor pins 1 & 3 and
// other on motor pins 2 & 4. step angle 5.625/64 ,
// operating frequency 100pps. current draw 92ma.
////////////////////////////////////////////////

//declare variables motor pins
int motorpin1 = 2;    // blue   - 28byj48 pin 1
int motorpin2 = 4;    // pink   - 28byj48 pin 2
int motorpin3 = 3;    // yellow - 28byj48 pin 3
int motorpin4 = 5;    // orange - 28byj48 pin 4
 int sayi;
int sayii; // red    - 28byj48 pin 5 (vcc)
int ldr = 0;           
int ldr_value = 10;
int motorspeed = 1200;  //variable set stepper speed
int count = 0;          // count of steps made
int countsperrev = 256; // number of steps per full revolution
int lookup[8] = {b01000, b01100, b00100, b00110, b00010, b00011, b00001, b01001};

//////////////////////////////////////////////////////////////////////////////
void setup() {
  //declare motor pins outputs
  pinmode(motorpin1, output);
  pinmode(motorpin2, output);
  pinmode(motorpin3, output);
  pinmode(motorpin4, output);
  serial.begin(9600);
}

//////////////////////////////////////////////////////////////////////////////
void loop(){
  if(ldr_value = analogread(ldr))
  {
     serial.println(ldr_value);                 //prints ldr values serial monitor
  delay(10);
    clockwise();
  }
  else if (count == countsperrev * 2)
  {
    count = 0;}
  else{
    anticlockwise();
  count++;
}
}

//////////////////////////////////////////////////////////////////////////////
//set pins uln2003 high in sequence 1 4
//delay "motorspeed" between each pin setting (to determine speed)
void anticlockwise()
{
 
  for(int = 0; < 8; i++)
  {
    setoutput(i);
    delaymicroseconds(motorspeed);
  }
 
}

void clockwise()
{
 
 
  for(int = 7; >= 0; i--)
  {
    setoutput(i);
    delaymicroseconds(motorspeed);
  }
 
}

void setoutput(int out)
{
  digitalwrite(motorpin1, bitread(lookup[out], 0));
  digitalwrite(motorpin2, bitread(lookup[out], 1));
  digitalwrite(motorpin3, bitread(lookup[out], 2));
  digitalwrite(motorpin4, bitread(lookup[out], 3));
}

 

i recommend using motor shield
and af_motor library

and depending on how many steps stepper.
most steppers 48 steps

(48 steps = 360 degrees = 1 turn)

so 12 steps 90 degrees

try it, best way precisely control

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