Motor de passo + LDR

#include <AFMotor.h>
int sensor = 0;
int valorSensor = 0;

int x=0;
int y=0;

volatile int state1 = LOW;
volatile long lastDebounceTime = 0;
long debounceDelay = 10;

const int ledVermelho = 13;

AF_Stepper motor(200, 1);

void setup(){

  Serial.begin(9600);
  pinMode(ledVermelho,OUTPUT);
  motor.setSpeed(10);
  attachInterrupt(0, debounce, FALLING);

}

void loop(){

  int valorSensor = analogRead(sensor);
  Serial.println(valorSensor);

  if (valorSensor < 30) {
    apagaLeds();
    digitalWrite(ledVermelho,HIGH);
  }

  if (valorSensor > 30) {
    apagaLeds();



  }

 if (y==0){

  while(x<7){
    motor.step(1, FORWARD, SINGLE);
   x++;
  //Serial.println(x);

  }

  while(x>0){
     motor.step(1, BACKWARD, SINGLE);
    x--;
    //Serial.println(x);

  }
 }

if (y==1){
}
}

void apagaLeds() {

  digitalWrite(ledVermelho,LOW);
}
  void debounce(){


  long currentTime = millis();

  if ((currentTime - lastDebounceTime) > debounceDelay)
  {
    lastDebounceTime = currentTime;

   desliga();

  }
  }

  void desliga() {
    //Serial.println(y);
    y = !y;
}