/* Project: default */
  #include <NewPing.h> 
  
  
  #define TRIGGER_PIN 25
  #define ECHO_PIN 33
  #define MAX_DISTANCE 150 
  #define SOUND_SPEED 0.171 
  NewPing sonar(TRIGGER_PIN, ECHO_PIN, MAX_DISTANCE); 
  
  unsigned long Frecuencia_ = 0;
  
  void setup()
  {
    Serial.begin(115200);
  }
  
  void loop()
  {
    if(millis() - Frecuencia_ > 500){
    Frecuencia_ = millis();
    Serial.println(sonar.ping_cm());}
  }