Código do reto (sol 1)

/*** Global variables ***/

/*** Function declaration ***/

void setup()
{

pinMode(13,OUTPUT);

pinMode(12,OUTPUT);

}

void loop()
{
digitalWrite(13,HIGH);
digitalWrite(12,LOW);
delay(500);
digitalWrite(13,LOW);
digitalWrite(12,HIGH);
delay(500);

}

/*** Function definition ***/