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

#define TEMP_PIN 2       // Single input pin for temperature status
#define FAN_PIN 6        // Output pin for fan control

LiquidCrystal_I2C lcd(0x27, 16, 2); // I2C LCD with address 0x27

void setup() {
    Wire.begin();
    lcd.init();
    lcd.backlight();

    pinMode(TEMP_PIN, INPUT);  
    pinMode(FAN_PIN, OUTPUT);

    // Startup Message
    lcd.setCursor(0, 0);
    lcd.print("Digital Template");
    lcd.setCursor(0, 1);
    lcd.print("Controller");
    delay(2000);
    lcd.clear();
}

void loop() {
    int tempStatus = digitalRead(TEMP_PIN);

    if (tempStatus == HIGH) {
        lcd.setCursor(0, 0);
        lcd.print("Temperature HIGH");
        lcd.setCursor(0, 1);
        lcd.print("FAN ON            ");
        digitalWrite(FAN_PIN, HIGH);  // Fan ON
    } 
    else if (tempStatus == LOW) {
        lcd.setCursor(0, 0);
        lcd.print("Temperature LOW ");
        lcd.setCursor(0, 1);
        lcd.print("FAN OFF           ");
        digitalWrite(FAN_PIN, LOW);  // Fan OFF
    }

    delay(1000);  // Refresh every second
}