#include <Wire.h>
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);  // I2C LCD1602

const int trigPin = 8;
const int echoPin = 9;
long duration;
float distanceCm;

void setup() {
  lcd.begin(16, 2);
  lcd.backlight();

  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);

  lcd.setCursor(0, 0);
  lcd.print(" Masofa tizimi ");
  delay(2000);
  lcd.clear();
}

void loop() {
  // Trigger signal jo‘natish
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  // Echo signalni o‘qish
  duration = pulseIn(echoPin, HIGH);
  distanceCm = duration * 0.034 / 2; // sm ga aylantirish

  // Masofani ekranga chiqarish
  lcd.setCursor(0, 0);
  lcd.print("Masofa: ");
  lcd.print(distanceCm);
  lcd.print(" cm ");

  lcd.setCursor(0, 1);
  if (distanceCm < 65) {
    lcd.print("XAVFLI MASOFA  ");
  } else {
    lcd.print("XAVFSIZ MASOFA ");
  }

  delay(500); // o'qishlar oralig‘i
}