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

const int sensorPin = A0;
float voltage, temperatureC;

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

void setup() {
  lcd.init();              // Initialize LCD
  lcd.backlight();         // Turn on backlight
  lcd.setCursor(0, 0);
  lcd.print("Hello I2C LCD");

  Serial.begin(9600);
  delay(2000);             // Wait before showing temperature
  lcd.clear();
}

void loop() {
  int adcValue = analogRead(sensorPin);
  voltage = adcValue * (5.0 / 1023.0);  // Assuming 5V reference
  temperatureC = voltage * 100;         // LM35: 10mV per °C

  // Print to Serial Monitor
  Serial.print("ADC: ");
  Serial.print(adcValue);
  Serial.print(" | Temp: ");
  Serial.print(temperatureC, 1);
  Serial.println(" C");

  // Display on LCD
  lcd.setCursor(0, 0);
  lcd.print("Temp: ");
  lcd.print(temperatureC, 1);
  lcd.print((char)223); // Degree symbol
  lcd.print("C     ");  // Padding to clear old chars

  delay(1000);
}