#define ledvermelho 6
#define ledverde 11
#define ledamarelo 9

void setup() {
  pinMode(ledvermelho, OUTPUT);
  pinMode(ledverde, OUTPUT);
  pinMode(ledamarelo, OUTPUT);
}

void loop() {
  digitalWrite(ledvermelho,HIGH);
  digitalWrite(ledverde,LOW);
  
  delay(2000);
  digitalWrite(ledamarelo,HIGH);
  digitalWrite(ledvermelho,LOW);
  delay(1000);
  digitalWrite(ledverde,HIGH);
  digitalWrite(ledamarelo, LOW);
  delay(2000);
}