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

// LCD I2C Address (Use 0x27 or 0x3F)
LiquidCrystal_I2C lcd(0x27, 16, 2);

// Ultrasonic Sensor Pins
#define TRIG_PIN 2
#define ECHO_PIN 3

void setup() {
    pinMode(TRIG_PIN, OUTPUT);
    pinMode(ECHO_PIN, INPUT);

    Wire.begin(6, 7);  // Explicitly initialize I2C on ESP32-C3 Xiao (SDA=6, SCL=7)
    lcd.init();        // Use init() instead of begin() for Wokwi
    lcd.backlight();

    lcd.setCursor(0, 0);
    lcd.print("Distance Sensor");
    delay(1000);
    lcd.clear();
}

void loop() {
    // Send a 10-microsecond pulse to trigger the sensor
    digitalWrite(TRIG_PIN, LOW);
    delayMicroseconds(2);
    digitalWrite(TRIG_PIN, HIGH);
    delayMicroseconds(10);
    digitalWrite(TRIG_PIN, LOW);

    // Read the echo pin and calculate distance
    long duration = pulseIn(ECHO_PIN, HIGH);
    int distance = duration * 0.0343 / 2; // Convert to cm

    // Display on LCD
    lcd.setCursor(0, 0);
    lcd.print("Distance: ");
    lcd.print(distance);
    lcd.print(" cm   "); // Clear old values with spaces

    delay(500);
}