#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd (0x27);
int ledM = 13;
int ledH = 12;
int kolom = 16;
int baris = 2;

#define ECHO 10
#define TRIG 11
#include <Servo.h>

Servo servoku;
int sudut;
int BUZZER=7;

void setup(){
  lcd.init();
  lcd.backlight();
  servoku.attach(9);
  pinMode(ledM, OUTPUT);
  pinMode(ledH, OUTPUT);
  pinMode(ECHO, INPUT);
  pinMode(TRIG, OUTPUT);
  pinMode(BUZZER, OUTPUT);
}

float jarak_cm(){
  digitalWrite (TRIG, LOW);
  delayMicroseconds (2);
  digitalWrite (TRIG, HIGH);
  delayMicroseconds (10);
  digitalWrite (TRIG, LOW);
  int durasi = pulseIn (ECHO, HIGH);
  return durasi*0.034/2;

}

void loop (){
  float jarak = jarak_cm();
  if (jarak>150){
  int i;
  lcd.setCursor(0,0);
  lcd.print("AWAS ADA KERETA");
    digitalWrite (ledM, HIGH);
    digitalWrite (ledH, LOW);
    tone (BUZZER, 1000, 200);
    servoku.write (90);
  }else{
    if (jarak<150);
    lcd.setCursor(0,1);
    lcd.print("KERETA API SUDAH LEWAT");
    digitalWrite(ledM, LOW);
    digitalWrite(ledH, HIGH);
    servoku.write (0);
  }
}