#include <LiquidCrystal.h>

// LCD module connections (RS, E, D4, D5, D6, D7)
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

// Define potentiometer pin
const int contrastPin = A0; // Connect potentiometer to analog pin A0

void setup() {
  // Set up the number of columns and rows on the LCD
  lcd.begin(16, 2);  // Adjust this according to your LCD's specifications (columns, rows)
}

void loop() {
  // Read the value from the potentiometer
  int contrastValue = analogRead(contrastPin);

  // Adjust the contrast of the LCD based on potentiometer value
  lcd.setCursor(0, 0);
  lcd.print("hello, world!");
  lcd.setCursor(0, 1);
  lcd.print("Contrast: ");

  // Display the potentiometer value as a bar graph for contrast adjustment
  int numBlocks = map(contrastValue, 0, 1023, 0, 16); // Map potentiometer value to 16 blocks
  for (int i = 0; i < numBlocks; i++) {
    lcd.print("#");
  }
  
  delay(100); // Adjust this delay as needed for responsiveness
}