#define LED 13
void setup() {
  Serial.begin(9600);
  pinMode(LED, OUTPUT);
}

void loop() {
 Serial.println("olá");
 digitalWrite(LED,!digitalRead(LED));
 delay(1000);
}
D0D1D2D3D4D5D6D7GNDLOGIC
D0D1D2D3D4D5D6D7GNDLOGIC