#include <Wire.h>
#include <LiquidCrystal_I2C.h>
// HC-SR04 pinlari
#define TRIG_PIN 9
#define ECHO_PIN 10
// LCD manzili 0x27, o'lchami 16x2
LiquidCrystal_I2C lcd(0x27, 16, 2);
void setup() {
 // Serial Monitorni ishga tushirish
 Serial.begin(9600);
 // HC-SR04 pinlarini sozlash
 pinMode(TRIG_PIN, OUTPUT);
 pinMode(ECHO_PIN, INPUT);
 // LCD displeyni ishga tushirish
 lcd.init();
 lcd.backlight();
 // Boshlang'ich xabar
 lcd.setCursor(0, 0);
 lcd.print("HC-SR04 Sensor");
 lcd.setCursor(0, 1);
 lcd.print("Ishga tushdi");
 delay(2000);
 lcd.clear();
}
void loop() {
 // TRIG pinini LOW holatga o'tkazish
 digitalWrite(TRIG_PIN, LOW);
 delayMicroseconds(2);
 // TRIG piniga 10 mikrosekund HIGH impuls berish
 digitalWrite(TRIG_PIN, HIGH);
 delayMicroseconds(10);
 digitalWrite(TRIG_PIN, LOW);
 // ECHO pinidagi impuls davomiyligini o'lchash
 long duration = pulseIn(ECHO_PIN, HIGH);
 // Masofani santimetrda hisoblash
 float distance = duration / 58.0;
 // Serial Monitor oynasiga chiqarish
 Serial.print("Masofa: ");
 Serial.print(distance);
 Serial.println(" cm");
 Serial.println("----------------");
 // LCD displeyga chiqarish
 lcd.clear();
 lcd.setCursor(0, 0);
 lcd.print("Masofa:");
 lcd.setCursor(0, 1);
 lcd.print(distance);
 lcd.print(" cm");
 delay(1000);
}