const int sensorPin = 9;
void setup() {
  Serial.begin(9600);   //iniciar puerto serie
  pinMode(sensorPin , INPUT);  //definir pin como entrada
void loop(){
  int value = 0;
  value = digitalRead(sensorPin );  //lectura digital de pin
  if (value == HIGH) {
      Serial.println("Detectado obstaculo");



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