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

#define POTENTIOMETER_PIN 34  // Analog input pin for potentiometer

LiquidCrystal_I2C lcd(0x27, 16, 2); // Change address to 0x3F if 0x27 doesn't work

void setup() {
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("Bar Graph:");
}

void loop() {
  // Read potentiometer value (0-4095 for 12-bit ADC)
  int sensorValue = analogRead(POTENTIOMETER_PIN);
  
  // Map the sensor value to a range for the bar graph (0-16 characters)
  int barLength = map(sensorValue, 0, 4095, 0, 16);
  
  // Clear previous display
  lcd.setCursor(0, 1);
  lcd.print("                "); // Clear the second row
  
  // Draw the bar graph
  lcd.setCursor(0, 1);
  for (int i = 0; i < barLength; i++) {
    lcd.print((char)255); // Use character 255 for filled blocks
  }

  delay(500); // Update every 500 ms
}