// Task 5: Communication using I2C LCD + Temperature Sensor

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

// LCD setup: address 0x27, 16 columns x 2 rows
LiquidCrystal_I2C lcd(0x27, 16, 2);

// Thermistor parameters
const int tempPin = A0;
const float BETA = 3950; // Should match the thermistor's Beta coefficient

void setup() {
  lcd.init();           // Initialize LCD
  lcd.backlight();      // Turn on backlight
  lcd.setCursor(0, 0);
  lcd.print("Hello I2C LCD");
  Serial.begin(9600);   // For debugging

}

void loop() {
  int analogValue = analogRead(tempPin);

  // Convert ADC reading to temperature (Celsius)
  float celsius = 1 / (log(1 / (1023.0 / analogValue - 1)) / BETA + 1.0 / 298.15) - 273.15;

  // Display on LCD
  lcd.setCursor(0, 1);
  lcd.print("Temp: ");
  lcd.print(celsius, 1);
  lcd.print((char)223);  // Degree symbol
  lcd.print("C   ");     // Clear old digits with spaces

  // Print to Serial Monitor
  Serial.print("Analog: ");
  Serial.print(analogValue);
  Serial.print(" | Temp: ");
  Serial.print(celsius);
  Serial.println(" °C");

  delay(1000);
}