int rojo1 = 27;
int amarillo1 = 14;
int verde1 = 12;
int rojo2 = 5;
int amarillo2 = 17;
int verde2 = 16;

void setup() {
  pinMode(rojo1, OUTPUT);
  pinMode(amarillo1, OUTPUT);
  pinMode(verde1, OUTPUT);
  pinMode(rojo2, OUTPUT);
  pinMode(amarillo2, OUTPUT);
  pinMode(verde2, OUTPUT);
}

void loop() {
  digitalWrite(verde1, HIGH);
  digitalWrite(rojo2, HIGH);
  delay(2000);
  
  digitalWrite(verde1, LOW);
  digitalWrite(rojo2, LOW);
  digitalWrite(amarillo1, HIGH);
  digitalWrite(amarillo2, HIGH);
  delay(1000);
  
  digitalWrite(amarillo1, LOW);
  digitalWrite(amarillo2, LOW);
  digitalWrite(rojo1, HIGH);
  digitalWrite(verde2, HIGH);
  delay(2000);
  
  digitalWrite(verde2, HIGH);
  digitalWrite(rojo1, HIGH);
  delay(2000);
  
  digitalWrite(verde2, LOW);
  digitalWrite(rojo1, LOW);
  digitalWrite(amarillo1, HIGH);
  digitalWrite(amarillo2, HIGH);
  delay(1000);
  
  digitalWrite(amarillo1, LOW);
  digitalWrite(amarillo2, LOW);
  digitalWrite(rojo2, HIGH);
  digitalWrite(verde1, HIGH);
  delay(2000);
}