void setup() {
  // put your setup code here, to run once:
pinMode(2, INPUT);          // declaro pin 2 como entrada)
pinMode(3, OUTPUT);        // declaro pin 3 como salida
}
void loop() {
  // put your main code here, to run repeatedly:
if (digitalRead(2)==HIGH)   // evaluo si input == H  o == L
digitalWrite(3, HIGH);      //enciendo led

else{
  digitalWrite(3, LOW);     // apago led
}
}