int LED_Verde = 4;
int LED_Amarelo = 5;
int LED_Azul = 6;
int LED_Rosa = 7;
 
void setup() 
{
  pinMode( LED_Verde, OUTPUT );
  pinMode( LED_Amarelo, OUTPUT );
  pinMode( LED_Azul, OUTPUT );
  pinMode( LED_Rosa, OUTPUT );
}

void loop() 
{
  digitalWrite( LED_Verde, HIGH );
  digitalWrite( LED_Amarelo, LOW );
  digitalWrite( LED_Azul, HIGH );
  digitalWrite( LED_Rosa, LOW );
  delay(500);
  digitalWrite( LED_Verde, LOW );
  digitalWrite( LED_Amarelo, HIGH );
  digitalWrite( LED_Azul, LOW );
  digitalWrite( LED_Rosa, HIGH );
  delay(500);
}