Help Debugging My Arduino Code

Hello, I am doing a project for my engineering class.Its uses Arduino. I started a project from this site:

It’s gone well but the code seems to have a lot of bugs in it. Any help would be greatly appreciated.
Here is the code

/*

Arduino with PIR motion sensor

activate camera motor projects

Writes by Engineer Mohanad Hameed */

#include //include stepper library int led = 13; // the pin that the LED is attached to

int sensor = 2; // the pin that the sensor is attached to

int state = LOW; // by default, no motion detected

int val = 0; // variable to store the sensor status (value)

int in1Pin = 12; //the pin that the phase 1 is attached to

int in2Pin = 11; //the pin that the phase 2 is attached to

int in3Pin = 10; //the pin that the phase 3 is attached to

int in4Pin = 9; //the pin that the phase 4 is attached to

int step_num =700;

Stepper motor(64, in1Pin, in2Pin, in3Pin, in4Pin);

void setup() {

pinMode(led, OUTPUT); // initialize LED as an output

pinMode(sensor, INPUT); // initialize sensor as an input

pinMode(in1Pin, OUTPUT); // initialize in1pin as an output

pinMode(in2Pin, OUTPUT); // initialize in2pin as an output

pinMode(in3Pin, OUTPUT); // initialize in3pin as an output

pinMode(in4Pin, OUTPUT); // initialize in4pin as an output

motor.setSpeed(300); //speed of the motor }

void loop(){

val = digitalRead(sensor); // read sensor value

if (val == HIGH) { // check if the sensor is HIGH

digitalWrite(led, HIGH); // turn LED ON

motor.step(step_num); //rotate the motor foreword

delay(1000); // delay 300 milliseconds

motor.step(-step_num); //rotate the motor backward

delay(300);

if (state == LOW)

{ state = HIGH; // update variable state to HIGH

}

}

else {

digitalWrite(led, LOW); // turn LED OFF

motor.step(0);

if (state == HIGH) {

state = LOW; // update variable state to LOW

}

}

}

The title of the section of the forum (where you initially posted this) is "Installation & Troubleshooting - For problems with Arduino itself, NOT your project"; I've asked a moderator to move your thread.

Please read How to use this forum - please read, specifically point #7 about posting code.

Also give a good description of the problems that you're experiencing.

Thread moved.