Programa 1 - Ligar led

Acender Led no arduino

void setup() {
  // put your setup code here, to run once:
  pinMode(10, OUTPUT);//ligar
}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(10, HIGH);//liga
  delay(1000);//a cada 1 seg
  digitalWrite(10, LOW);//desliga
  delay(1000);
}

Créditos para  https://cursodearduino.net/