#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, kolom, baris);

const int trigPin = 3;
const int echoPin = 2;

long duration;
int jarakCm, jarak Inch;

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

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

#define pinTrig 3
#define pinEcho 2
#define pinBuz 13

long waktu, jarak;

void setup() {
  Serial.begin(9600);
pinMode (pinBuz,OUTPUT);
pinMode (pinTrig, OUTPUT);
pinMode (pinEcho, INPUT);
}

void loop(){
   int i;
  lcd.setCursor(0,0);
  lcd.print("orang datang");
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);

  if (jarakCm ,=5)
  
digitalWrite(pinTrig, LOW);
delayMicroseconds(2);
digitalWrite(pinTrig, HIGH);
delayMicroseconds(10);
digitalWrite(pinTrig, LOW);

waktu = pulseIn(pinEcho, HIGH);
jarak = waktu / 20.2;

if (jarak < 150 && jarak >= 100);
tone (pinBuz, 250);
delay (2000);
noTone (pinBuz);
delay(3000);
}