#include <ESP32Servo.h> 
#include <LiquidCrystal_I2C.h> 
LiquidCrystal_I2C lcd(0x27,16,2);

Servo servoku; 
int echoPin = 4; 
int trigPin = 15; 
int buzzer = 2; 

void setup() {
  
  pinMode(echoPin, INPUT); 
  pinMode(trigPin, OUTPUT); 
  pinMode(buzzer, OUTPUT); 
  pinMode(12, OUTPUT);
  pinMode(13, OUTPUT);
  servoku.attach(5); 
  lcd.init();
  lcd.clear();
  lcd.backlight();
}

float bacaUltrasonik(){ 
  digitalWrite(trigPin, LOW); 
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH); 
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW); 
  int durasi = pulseIn(echoPin, HIGH);  
  return durasi * 0.034 / 2; 
}
void loop() {
  lcd.clear();
 
  float jarak = bacaUltrasonik(); 
  if(jarak<=100){ 
    tone(buzzer, 400);
    delay(500);
    tone(buzzer, 250);
    delay(5000);

    servoku.write(90); 
    lcd.print("Awas Ada Kereta ");
    digitalWrite(13, HIGH);
    digitalWrite(12, LOW);
  }
  else{
    noTone(buzzer);
    servoku.write(0); 
    lcd.print("Kereta Sudah Lewat");
    digitalWrite(12, HIGH);
    digitalWrite(13, LOW);
  }
  delay(1000);
}