// programa semaforo
// 08/03/2024

void setup(){  // chave de inicio

  pinMode(4, OUTPUT);
  pinMode(16, OUTPUT);
  pinMode(17, OUTPUT);


} // chave fim 


void loop(){

  digitalWrite(4, HIGH);
  digitalWrite(16, LOW);
  digitalWrite(17, LOW);
  delay(1000);

  digitalWrite(4, 0);
  digitalWrite(16, 0);
  digitalWrite(17, 1);
  delay(1000);

  digitalWrite(4, LOW);
  digitalWrite(16, HIGH);
  digitalWrite(17, LOW);
  delay(1000); 

}