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


#define ECHO_PIN 2
#define TRIG_PIN 3

void setup() {

  Serial.begin(115200);
  pinMode(LED_BUILTIN, OUTPUT);
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
  pinMode(13, OUTPUT);
  lcd.init();
  lcd.backlight();

}
void loop() {
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);
  int duration = pulseIn(ECHO_PIN, HIGH);
  float distance = duration * 0.034 / 2;
  float y = (1E-06*distance*distance) + (1.0055*distance) + 0.0012;

  lcd.setCursor(2, 0);
  lcd.print("Ptoy: ");
  lcd.println(y);
  if (200>y){
  lcd.setCursor(3,1);
  lcd.print(" Hati-Hati ");  
  digitalWrite(12, HIGH);
  delay(100);
  digitalWrite(12, LOW);
  delay(100);
  }
  else{
  lcd.setCursor (0 , 1);
  lcd.print("                ");
 delay(100);
  }
}