#include <LiquidCrystal_I2C.h>
#define Trigpin 12
#define Echopin 11
#define led 6
float distance;
LiquidCrystal_I2C lcd(0x27,16,2);
void setup() {
  // put your setup code here, to run once:
pinMode(Trigpin, OUTPUT);
pinMode(Echopin, INPUT);
//Serial.begin(9600);
lcd.begin(16,2);
lcd.clear();
pinMode(led, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(Trigpin,LOW);
  delayMicroseconds(2);
  digitalWrite(Trigpin,HIGH);
  delayMicroseconds(10);
  digitalWrite(Trigpin,LOW);
  distance=pulseIn(Echopin,HIGH)/58.0;
  lcd.setCursor(0,0);
  lcd.print(distance);
  lcd.print("CM");
  if(distance<=5)
  {digitalWrite(led, HIGH);
  tone(8,1000,1000);}
  else 
  {digitalWrite(led,LOW); 
  noTone(8);}//Serial.print(distance);
  //Serial.print("CM");
  
  delay(1000);
}