#include <Wire.h>  // Include the Wire library for I2C communication
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 20, 4); // Set the LCD address and dimensions

const int triggerPin = 26; // Define the trigger pin
const int echoPin = 25;    // Define the echo pin

float cm;
float inches;

long readUltrasonicDistance() {
  pinMode(triggerPin, OUTPUT);
  digitalWrite(triggerPin, LOW);
  delayMicroseconds(2);
  digitalWrite(triggerPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(triggerPin, LOW);
  pinMode(echoPin, INPUT);
  return pulseIn(echoPin, HIGH);
}

void setup() {
  Serial.begin(9600);
  lcd.init();
  lcd.backlight();
  lcd.setCursor(3, 1);
  lcd.print("Head Dou Big");
  lcd.setCursor(1, 3);
  lcd.print(" Ar ha ar ha ar ha");
  delay(2500);
  lcd.clear();
}

void loop() {
  cm = 0.03420 / 2 * readUltrasonicDistance();
  
  if (cm < 40) {
    lcd.clear();
    lcd.setCursor(0, 1);
    lcd.print("Warning! Full!");
  } else {
    inches = (cm / 2.54);
    
    lcd.setCursor(5, 0);
    lcd.print("Please fill in");
    lcd.setCursor(2, 3);
    lcd.print("Inches");
    lcd.setCursor(13, 3);
    lcd.print("CM");
    lcd.setCursor(3, 2);
    lcd.print(inches, 1);
    lcd.setCursor(12, 2);
    lcd.print(cm, 1);
    lcd.setCursor(14, 1);
  }

  delay(2000);
  lcd.clear();
}