#include <Wire.h>
#include <LiquidCrystal_I2C.h>  // Include the LCD library for I2C

LiquidCrystal_I2C lcd(0x27, 16, 2);  // LCD I2C address (0x27) and size (16x2)

const int sensorPin = A0;   // TMP36 sensor connected to analog pin A0
const int greenLED = 5;     // Green LED connected to pin 5
const int redLED = 6;       // Red LED connected to pin 6
const int buzzer = 4;       // Buzzer connected to pin 9

// Temperature threshold
const float baselineTemp = 40.0;  // Set the baseline temperature (e.g., 30°C)

void setup() {
  // Initialize pins
  pinMode(greenLED, OUTPUT);
  pinMode(redLED, OUTPUT);
  pinMode(buzzer, OUTPUT);

  // Initialize the LCD
  lcd.init();  // Start the LCD with 16 columns and 2 rows
  lcd.backlight();  // Make sure backlight is off initially

  // Initialize Serial Monitor for debugging
  Serial.begin(9600);
  lcd.clear();
  lcd.print("TempCheck");
  delay(1500);
  lcd.clear();
}

void loop() {
  // Read TMP36 sensor value
  int sensorValue = analogRead(sensorPin);  // Read the sensor value (0-1023)
  float voltage = sensorValue * (5.0 / 1023.0);  // Convert sensor value to voltage (0-5V)
  float celsius = (voltage - 0.5) * 100.0;  // Convert voltage to temperature (TMP36 formula)

  // Display temperature on the Serial Monitor
  Serial.print("Temp: ");
  Serial.print(celsius);
  Serial.println(" C");

  // Display temperature on the LCD
  lcd.clear();
  lcd.print("Temp: ");
  lcd.print(celsius);
  lcd.print(" C");

  // Status check for temperature threshold
  if (celsius > baselineTemp) {
    digitalWrite(greenLED, LOW);  // Turn off green LED
    digitalWrite(redLED, HIGH);   // Turn on red LED
    //digitalWrite(buzzer, HIGH);   // Turn on buzzer
    tone(buzzer, 440);
    lcd.clear();
    lcd.print("Status: HOT!");
  } else {
    digitalWrite(greenLED, HIGH);  // Turn on green LEDnoTone
    digitalWrite(redLED, LOW);     // Turn off red LED
    //digitalWrite(buzzer, LOW);     // Turn off buzzer
    noTone(buzzer);
    lcd.clear();
    lcd.print("Status: Normal");
  }

  delay(1000);  // Wait for 1 second before updating the reading
}