// Definindo as portas com os nomes das funcionalidades
int led_1 = 8;
int led_2 = 12;

// Definindo os estado do led como booleano
bool ligadhu_desligadhu = HIGH;

void setup()
{
  pinMode(led_1, OUTPUT);
  pinMode(led_2, OUTPUT);
}

void loop()
{
  digitalWrite(led_1, ligadhu_desligadhu);
  digitalWrite(led_2, !ligadhu_desligadhu);
  
  delay(1000);

  ligadhu_desligadhu = !ligadhu_desligadhu;
}