Bipolar Stepper with L293D

Hi so I am wiring my stepper with the schematic provided by arduino to control a bipolar stepper via two control pins, I cannot get the stepper to move and my L293D is getting very hot, I am using an AC convertor to 12vDC.
Can anyone spot a fault in my wiring or the code?
Cheers

int turn = 3;
int dir = 2;



void setup() {                

  pinMode(turn, OUTPUT);  
  pinMode(dir, OUTPUT);  
}


void loop() {

  
  digitalWrite(dir, HIGH);  

  digitalWrite(turn, HIGH);   
  delayMicroseconds(800); 
  digitalWrite(turn, LOW);  
  delayMicroseconds(1500);
}

The L293D can only drive very small stepper motors. I suspect that your motor needs a driver than can supply more current. Please provide details of the motor.

@hen, I thought you had already decided to use A4988 drivers after a lot of advice from this forum?

http://forum.arduino.cc//index.php?topic=194229.15

...R

hen:
Hi so I am wiring my stepper with the schematic provided by arduino to control a bipolar stepper via two control pins, I cannot get the stepper to move and my L293D is getting very hot, I am using an AC convertor to 12vDC.
Can anyone spot a fault in my wiring or the code?
Cheers

What motor?
What power supply? "12vDC" is not enough information.
What H-bridge?
What schematic?

These are the first pieces of information to provide!