#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd (0x27, 16, 2);

const int trigPin = 6;
const int echoPin = 7;
int buzzer=8;

long duration;
int jarakCm, jarakInch;

void setup() {
lcd.begin(12,2);

pinMode(trigPin, OUTPUT);
pinMode(echoPin, INPUT);
Serial.begin(9600);
 }

 void loop() {
 digitalWrite(trigPin, LOW);
 delayMicroseconds(2);

 digitalWrite(trigPin, HIGH);
 delayMicroseconds(10);
 digitalWrite(trigPin, LOW);

 duration =pulseIn(echoPin, HIGH);
 jarakCm = duration*0.034/2;
 jarakInch = duration*0.133/2;

 lcd.setCursor(0,0);
 lcd.print("Jarak: ");
 lcd.print("cm ");
 delay(10);
 lcd.setCursor(0,1);
 lcd.print("Jarak: ");
 lcd.print(jarakInch);
 lcd.print("inch ");
 delay(10);

 if(jarakCm <=5) {

   tone(buzzer,1030);
   delay(400);
   noTone(8);
   delay(100);
 }
 
 }