//Nome:Estrela José Marcolino

#define Ap 20
#define Am 21
#define Bp 19
#define Bm 18

void setup() {
  pinMode(Ap, OUTPUT);
  pinMode(Am, OUTPUT);
  pinMode(Bp, OUTPUT);
  pinMode(Bm, OUTPUT);
}

void loop() {
  
  delay(10); // this speeds up the simulation
  digitalWrite(Bm,LOW);   digitalWrite(Ap, HIGH);
  delay(10);
  digitalWrite(Ap,LOW);   digitalWrite(Bp, HIGH);
  delay(10);
  digitalWrite(Bp,LOW);   digitalWrite(Am, HIGH);
  delay(10);
  digitalWrite(Am,LOW);   digitalWrite(Bm, HIGH);

}