#include <LiquidCrystal.h>


LiquidCrystal lcd (12, 11, 10, 9, 8, 7);

#define ECHO_PIN 2
#define TRIG_PIN 3


void setup() {
  // put your setup code here, to run once:

  lcd.begin (16,2);
  lcd.print("Hello World");
  delay(1000);

  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
}
  float readDistanceCM() {
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);
  int duration = pulseIn(ECHO_PIN, HIGH);
  return duration * 0.034 / 2;


}

void loop() {
  // put your main code here, to run repeatedly:
float distance = readDistanceCM();

lcd.clear();
//delay(500);
lcd.setCursor(0,0);
lcd.print("Distancia:");
lcd.setCursor(10,0);
lcd.print(distance);
lcd.setCursor(13,0);
lcd.print(" CM ");
delay(500);

}