#include "SR04.h"
#include <Wire.h> 
#include <LiquidCrystal_I2C.h>
#define TRIG_PIN 12
#define ECHO_PIN 11
SR04 sr04 = SR04(ECHO_PIN,TRIG_PIN);
long a;
LiquidCrystal_I2C lcd(0x27, 16, 2);
void setup() {
  lcd.begin();
  lcd.backlight();
   Serial.begin(9600);
   delay(1000);
   
}

void loop() {
  lcd.clear();
   a=sr04.Distance();
   Serial.print(a);
   lcd.print(a);
   Serial.println("cm");
   lcd.print(" cm");
   delay(1000);
}