#define ledR 4
#define ledV 1
#define botonV 2
#define botonA 6
#define st1 42
#define st2 39
#define dir1 41
#define dir2 40

volatile bool pushBlue = false;
int pasos=0;

void ARDUINO_ISR_ATTR interrupcionBoton(){
  pushBlue = true;
}

void setup() {
  Serial.begin(115200);
  pinMode(botonV, INPUT_PULLUP);
  pinMode(botonA, INPUT_PULLUP);
  pinMode(st1, OUTPUT);
  pinMode(st2, OUTPUT); 
  pinMode(dir1, OUTPUT);
  pinMode(dir2, OUTPUT);
  pinMode(ledR, OUTPUT);
  pinMode(ledV, OUTPUT);

  digitalWrite(ledR, HIGH);
  digitalWrite(ledV, LOW);

  attachInterrupt(botonA, interrupcionBoton, FALLING);
}

void loop() {
  if(digitalRead(botonV)==LOW){
    digitalWrite(ledR, LOW);
    movHor();
  }
}

void movHor(){
  digitalWrite(dir1, HIGH);
  digitalWrite(dir2, LOW);
  for (int i = 0; i < 1500; i++) { 
    if(pushBlue){
      pasos=i;
      movInt();
      return;
    }
    digitalWrite(st1, HIGH);
    digitalWrite(st2, HIGH); 
    delayMicroseconds(1000); 
    digitalWrite(st1, LOW);
    digitalWrite(st2, LOW); 
    delayMicroseconds(1000);
  }
  digitalWrite(ledV, HIGH);
  delay(5000);
  movAntHor();
}

void movInt(){
  digitalWrite(dir1, !digitalRead(dir1));
  digitalWrite(dir2, !digitalRead(dir2));
  for (int i = 0; i < pasos ; i++){
  digitalWrite(st1, HIGH);
  digitalWrite(st2, HIGH);
  delayMicroseconds(1000);
  digitalWrite(st1, LOW);
  digitalWrite(st2, HIGH);
  delayMicroseconds(1000);
  }
  digitalWrite(ledV, HIGH);
  delay(3000);
  movAntHor();
}

void movAntHor(){
  digitalWrite(ledV, LOW);
  digitalWrite(dir1, LOW);
  digitalWrite(dir2, HIGH);
  for (int i = 0; i < 1500; i++) { 
    if(pushBlue){
      pasos=i;
      movInt();
      return;
    }
    digitalWrite(st1, HIGH);
    digitalWrite(st2, HIGH); 
    delayMicroseconds(1000); 
    digitalWrite(st1, LOW);
    digitalWrite(st2, LOW); 
    delayMicroseconds(1000);
  }
  digitalWrite(ledR, HIGH);
}