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

#define I2C_ADDR 0x27
#define LCD_COLUMNS 20
#define LCD_LINES 4

//LiquidCrystal lcd(12, 11, 10, 9, 8, 7);
LiquidCrystal_I2C lcd(I2C_ADDR,LCD_COLUMNS,LCD_LINES);

#define LEDGreen  2
#define LEDRed    3
#define Buzzer    4

#define DHT_PIN   6
#define DHT_TYPE  DHT22

#define sensorMIN  0
#define sensorMAX  512
#define Threshold  300

DHT dht(DHT_PIN,DHT_TYPE);

int value = 0 ; //variable to store the sensor value
int level = 0 ; //variable to store the water level

void setup() {
  // put your setup code here, to run once:
  lcd.init();
  lcd.backlight();
  
  Serial.begin(9600);
  pinMode(Buzzer, OUTPUT);
  pinMode(LEDGreen, OUTPUT);
  pinMode(LEDRed, OUTPUT);
  digitalWrite(LEDGreen, LOW);
  digitalWrite(LEDRed, LOW);

  dht.begin();

  lcd.setCursor(6,0);
  lcd.print("Welcome");
  lcd.setCursor(2,1);
  lcd.print("TEMPT. & HUMIDITY");
  lcd.setCursor(5, 2);
  lcd.print("SENSOR");
  lcd.setCursor(7, 3);
  lcd.print("Enjoy!");

  delay(4000);
  lcd.clear();

}

void loop() {
  // put your main code here, to run repeatedly:
  delay(1000);
  //START
  noTone(Buzzer);
  digitalWrite(LEDGreen, LOW);
  digitalWrite(LEDRed, LOW);

  value = analogRead(DHT_PIN);
  digitalWrite(DHT_PIN, LOW);
  delay(1000);

  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();

  if (temperature < 25 && humidity < 25) {
    noTone(Buzzer);
    digitalWrite(LEDGreen, HIGH);
    digitalWrite(LEDRed, LOW);

    Serial.print("ATTENTION!!! LOW TEMPERATURE");
  
    lcd.setCursor(1, 3);
    lcd.print("LOW TEMPERATURE ");
  }

  else if (temperature > 35 || humidity >35) {
    tone(Buzzer,500);
    digitalWrite(LEDGreen, LOW);
    digitalWrite(LEDRed, HIGH);

    Serial.print("ATTENTION!!! TEMPERATURE TOO HIGH. ");

    lcd.setCursor(5, 3);
    lcd.print("TEMP. TOO HIGH");
  }

  else
    level = map(value,sensorMIN,sensorMAX,0,10); // to be 10 levels

  Serial.print("TEMPERATURE DETECTED: ");
  Serial.print(temperature);
  Serial.print(" HUMIDITY: ");
  Serial.println(humidity);

  lcd.setCursor(0, 0);
  lcd.print("TEMPERATURE: ");
  lcd.setCursor(13, 0);
  lcd.print(temperature);
  
  lcd.setCursor(0,1);
  lcd.print("HUMIDITY   : ");
  lcd.setCursor(13, 1);
  lcd.print(humidity);
}