#define m1 27
#define m2 14
#define m3 12
#define m4 13


void setup() {
  pinMode(m1, OUTPUT);
  pinMode(m2, OUTPUT);
  pinMode(m3, OUTPUT);
  pinMode(m4, OUTPUT);
  digitalWrite(m1, 0);
  digitalWrite(m2, 0);
  digitalWrite(m3, 0);
  digitalWrite(m4, 0);
}

void loop() {
  adelante();
  delay(1000);
  alto();
  delay(500);
  atras();
  delay(1000);
  alto();
  delay(500);
}

void alto(){
  digitalWrite(m1, 0);
  digitalWrite(m2, 0);
  digitalWrite(m3, 0);
  digitalWrite(m4, 0);
}

void atras(){
  digitalWrite(m1, 0);
  digitalWrite(m2, 1);
  digitalWrite(m3, 1);
  digitalWrite(m4, 0);
}

void adelante(){
  digitalWrite(m1, 1);
  digitalWrite(m2, 0);
  digitalWrite(m3, 0);
  digitalWrite(m4, 1);
}

void derecha(){
  digitalWrite(m1, 1);
  digitalWrite(m2, 0);
  digitalWrite(m3, 1);
  digitalWrite(m4, 0);
}

void izquierda(){
  digitalWrite(m1, 0);
  digitalWrite(m2, 1);
  digitalWrite(m3, 0);
  digitalWrite(m4, 1);
}

void izq1(){
  digitalWrite(m1, 0);
  digitalWrite(m2, 0); 
  digitalWrite(m3, 0); 
  digitalWrite(m4, 1);
}

void der1(){
  digitalWrite(m1, 1);
  digitalWrite(m2, 0); 
  digitalWrite(m3, 0); 
  digitalWrite(m4, 0);
}

void atrasizquierda(){
  digitalWrite(m1, 0);
  digitalWrite(m2, 0); 
  digitalWrite(m3, 1); 
  digitalWrite(m4, 0);
}

void atrasderecha(){
  digitalWrite(m1, 0);
  digitalWrite(m2, 1); 
  digitalWrite(m3, 0); 
  digitalWrite(m4, 0);
}