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

const int POT_PIN_1 = A1; // Pin A1 for potentiometer1
const int POT_PIN_2 = A2; // Pin A2 for potentiometer2
const float REFERENCE_VOLTAGE_1 = 3.3; // ADC reference voltage
const float REFERENCE_VOLTAGE_2 = 5.0; // ADC reference voltage

// Initialize the I2C LCD interface (address 0x27, 16 columns, 2 rows)
LiquidCrystal_I2C lcd(0x27, 16, 2); 

void setup() {
  // Initialize serial communication at 9600 baud
  Serial.begin(9600);
  // Initialize the LCD display
  lcd.init();
  lcd.backlight();
}

void loop() {
  // Read the analog voltage from the potentiometer
  int analog_value_1 = analogRead(POT_PIN_1);
  // Convert the analog value to a voltage in volts
  float voltage_1 = analog_value_1 * (REFERENCE_VOLTAGE_1 / 1023.0);
  // Convert the analog value to a string for printing to the LCD display
  char analog_string_1[7];
  dtostrf(voltage_1, 5, 2, analog_string_1);

  int analog_value_2 = analogRead(POT_PIN_2);
  // Convert the analog value to a voltage in volts
  float voltage_2 = analog_value_2 * (REFERENCE_VOLTAGE_2 / 1023.0);
  // Convert the analog value to a string for printing to the LCD display
  char analog_string_2[7];
  dtostrf(voltage_2, 5, 2, analog_string_2);

  // Print the voltage in volts and the digital value in decimal format
  // to the LCD display and the serial monitor
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Voltage: ");
  lcd.print(analog_string_1);
  lcd.print(" V");
  lcd.setCursor(0, 1);
  lcd.print("Voltage: ");
  lcd.print(analog_string_2);

  Serial.print("Voltage: ");
  Serial.print(analog_string_1);
  Serial.print(" V, Digital: ");
  Serial.println(analog_value_1);
  Serial.print("Voltage: ");
  Serial.print(analog_string_2);
  Serial.print(" V, Digital: ");
  Serial.println(analog_value_2);

  delay(100); // Delay for 100 ms before taking the next reading
}