#include <LiquidCrystal.h>  // Include the LiquidCrystal library for LCD control
#include <Servo.h>          // Include the Servo library to control the servo motor

Servo myservo;  // Create a Servo object to control a servo motor

// Define the Arduino pins connected to the LCD
const int rs = 12, en = 11, d4 = 5, d5 = 4, d6 = 3, d7 = 2;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);  // Initialize the LiquidCrystal object with the pin numbers

const int potpin = A0;  // Define the analog pin connected to the potentiometer
int val = 0;            // Variable to store the potentiometer reading
int lastVal = -1;       // Variable to store the last potentiometer value (used to detect changes)

void setup() {
  lcd.begin(16, 2);       // Initialize the LCD with 16 columns and 2 rows
  lcd.setCursor(0, 0);    // Set the cursor to the first column of the first row
  lcd.print("hello, world!"); // Print "hello, world!" on the LCD
  myservo.attach(6);      // Attach the servo motor to pin 6
}

void loop() {
  val = analogRead(potpin);      // Read the analog value from the potentiometer
  val = map(val, 0, 1023, 0, 180);  // Map the potentiometer value to a range of 0 to 180

  // Only update the LCD if the potentiometer value has changed
  if (val != lastVal) {
    lastVal = val;               // Update the lastVal to the current value

    myservo.write(val);          // Move the servo to the position corresponding to the potentiometer value

    lcd.setCursor(0, 1);         // Set the cursor to the first column of the second row
    lcd.print(val);              // Print the current potentiometer value on the LCD

    lcd.setCursor(9, 1);         // Set the cursor to the 10th column of the second row
    lcd.print("       ");        // Clear any previous status message (e.g., "closed" or "opened")

    // Display a status message based on the potentiometer value
    if (val == 0) {
      lcd.setCursor(9, 1);       // Set the cursor to the 10th column of the second row
      lcd.print("closed");       // If the value is 0, print "closed"
    } else if (val == 180) {
      lcd.setCursor(9, 1);       // Set the cursor to the 10th column of the second row
      lcd.print("opened");       // If the value is 180, print "opened"
    }
  }

  delay(100);  // Short delay to stabilize the reading and avoid rapid changes
}