//PTS SEMESTER 2 (2025)
//By Nasywa Fatika XI TEK 1
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16, 2);
int trig = 19;
int echo = 18;
long duration, jarak;
float suara = 0.034;

void setup() {
    lcd.init();
    lcd.backlight();
    lcd.clear();
    lcd.setCursor(1, 0);
    lcd.print("Mengukur Jarak");
    lcd.setCursor(6, 1);
    lcd.print("...");
    delay(2000);
    lcd.clear();

    pinMode(trig, OUTPUT);
    pinMode(echo, INPUT);
}

void loop() {
    digitalWrite(trig, LOW);
    delayMicroseconds(2);
    digitalWrite(trig, HIGH);
    delayMicroseconds(10);
    digitalWrite(trig, LOW);

    duration = pulseIn(echo, HIGH);
    jarak = duration * suara / 2;

    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Jarak: ");
    lcd.print(jarak);
    lcd.print(" cm");
    
    lcd.setCursor(0, 1);
    if (jarak > 10 || jarak == 0) { 
        lcd.print("TIDAK ADA BENDA");
    } else {
        lcd.print("ADA BENDA");
    }
    
    delay (1000);
}