#include <DHT.h>
#include <LiquidCrystal_I2C.h>

#define DHTPIN 4
#define DHTTYPE DHT22
#define LED_PIN 27 //red pin
#define LED1_PIN 25 //blue pin
#define BUZZER_PIN 26

#define TEMP_LOW 23
#define TEMP_HIGH 25
#define HUMI_LOW 40
#define HUMI_HIGH 60

#define I2C_ADDR    0x27
#define LCD_COLUMNS 16
#define LCD_LINES   2
DHT dht(DHTPIN, DHTTYPE);
LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLUMNS, LCD_LINES);

void setup() {
  Serial.begin(115200);
  pinMode(LED_PIN, OUTPUT);
  pinMode(LED1_PIN, OUTPUT);
  pinMode(BUZZER_PIN, OUTPUT);

    // Init
  lcd.init();
  lcd.backlight();
    // Print something
  lcd.setCursor(4, 0);
  lcd.print("T&H Fire");
  lcd.setCursor(2, 1);
  lcd.print("Alarm System");
  delay(1000);
  lcd.clear();

}

void loop() {
  float temp = dht.readTemperature();
  float humi = dht.readHumidity();

  Serial.print("Temp: ");
  Serial.print(temp);
  Serial.println("'C");

  Serial.print("Humidity: ");
  Serial.print(humi);
  Serial.println("%");

  Serial.println("---");

  lcd.setCursor(0, 0);
  lcd.print("Temp: ");
  lcd.print(temp);
  lcd.print("'C");

  lcd.setCursor(0, 1);
  lcd.print("Humi: ");
  lcd.print(humi);
  lcd.print(" %");

  delay(1000);

  if(temp > TEMP_HIGH)
  {
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("High Temp");
    lcd.setCursor(0, 1);
    lcd.print("Warming");
    delay(1000);
    lcd.clear();
    if (humi < HUMI_LOW)
    {
      digitalWrite(LED_PIN, HIGH); // Turn on Red LED
      tone(BUZZER_PIN, 1000); // Turn on buzzer
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("LowHumi");
      lcd.setCursor(0, 1);
      lcd.print("Fire Detected");
      delay(1000);
      digitalWrite(LED_PIN, LOW); // Turn off Red LED
      noTone(BUZZER_PIN); // Turn off buzzer
      lcd.clear();
    }
    else if (humi > HUMI_HIGH)
    {
      digitalWrite(LED_PIN, HIGH); // Turn on Red LED
      tone(BUZZER_PIN, 1000); // Turn on buzzer
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("High Humi");
      lcd.setCursor(0, 1);
      lcd.print("Electrical fire");
      delay(1000);
      digitalWrite(LED_PIN, LOW); // Turn off Red LED
      noTone(BUZZER_PIN); // Turn off buzzer
      lcd.clear();
    }
  }
  else if(temp < TEMP_LOW)
  {
    digitalWrite(LED1_PIN, HIGH); // Turn on Blue LED
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Low Temp");
    lcd.setCursor(0, 1);
    lcd.print("Beware Cold");
    delay(1000);
    digitalWrite(LED1_PIN, LOW); // Turn off Blue LED
    lcd.clear();
    if(humi < HUMI_LOW)
    {
      digitalWrite(LED1_PIN, HIGH); // Turn on Blue LED
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("Low Humidity");
      lcd.setCursor(0, 1);
      lcd.print("Drink Water");
      delay(1000);
      digitalWrite(LED1_PIN, LOW); // Turn off Blue LED
      lcd.clear();
    }
    else if(humi > HUMI_HIGH)
    {
      digitalWrite(LED1_PIN, HIGH); // Turn on Blue LED
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("High Humi");
      lcd.setCursor(0, 1);
      lcd.print("Sloppy Floor");
      delay(1000);
      digitalWrite(LED1_PIN, LOW); // Turn off Blue LED
      lcd.clear();
    }
  }
  else if(temp > TEMP_LOW & temp < TEMP_HIGH)
  {
    if(humi < HUMI_LOW)
    {
      digitalWrite(LED1_PIN, HIGH); // Turn on Blue LED
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("Low Humidity");
      lcd.setCursor(0, 1);
      lcd.print("Drink Water");
      delay(1000);
      digitalWrite(LED1_PIN, LOW); // Turn off Blue LED
      lcd.clear();
    }
    else if(humi > HUMI_HIGH)
    {
      digitalWrite(LED1_PIN, HIGH); // Turn on Blue LED
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("High Humi");
      lcd.setCursor(0, 1);
      lcd.print("Sloppy Floor");
      delay(1000);
      digitalWrite(LED1_PIN, LOW); // Turn off Blue LED
      lcd.clear();
    }
  }

}