#include <DHT.h>
#include <LiquidCrystal.h>

const int rs=12, en=11, d4=10, d5=9, d6=8, d7=7;
LiquidCrystal lcd(rs,en,d4,d5,d6,d7);

#define MQ2_ANA A1
#define DHT_PIN 2
#define DHT_TYPE DHT22
DHT dht(DHT_PIN, DHT_TYPE);
int buzzerPin = 9;

const float TEMP_MIN = 18.0;
const float TEMP_MAX = 30.0;
const float HUMIDITY_MIN = 60.0;
const float HUMIDITY_MAX = 70.0;
const int CO2_THRESHOLD = 400;

void setup() {
  Serial.begin(9600);
  pinMode(MQ2_ANA, INPUT);
  pinMode(buzzerPin, OUTPUT);
  pinMode(LED_BUILTIN, OUTPUT);
  dht.begin();
  lcd.begin(16,2);
  lcd.print("Plant Monitoring");
  lcd.setCursor(0,1);
  lcd.print("System");
}

void loop() {
  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();
  int gasValue = analogRead(M_2_PI); 
  float co2 = map(gasValue, 0, 1023, 0, 2000);

  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Temp: ");
  lcd.print(temperature);
  lcd.print("C");

  lcd.setCursor(0, 1);
  lcd.print("Hum:");
  lcd.print(humidity);
  lcd.print("%");
  
  lcd.setCursor(8, 1);
  lcd.print("CO2:");
  lcd.print(co2);

  if(temperature >= TEMP_MIN && temperature <= TEMP_MAX){
    Serial.println("Temperature is optimal for the plant growth.");
  }
  else{
    digitalWrite(LED_BUILTIN, HIGH);
    buzzBuzzerTwice();
    Serial.println("This temperature can cause stress and impact plant growth.");
    if(temperature <= TEMP_MIN){
      Serial.println("The temperature is below 18° Celcuis");
    }
    else{
      Serial.println("The temperature is above 30° celcius");
    }
    digitalWrite(LED_BUILTIN, LOW);
    delay(2000);
  } 
  
  if(humidity >= HUMIDITY_MIN && humidity <= HUMIDITY_MAX){
    Serial.println("Humidty is optimal for the plant growth");
  }
  else{
    digitalWrite(LED_BUILTIN, HIGH);
    buzzBuzzerThrice();
    Serial.println("This humidity can cause stress and impact plant growth.");
    if(humidity >= HUMIDITY_MAX){
      Serial.println("Humidity above 70% can increase the risk of fungal diseases such as blight and powdery mildew");
    }
    else{
      Serial.println("Humidity below 60% can cause dehydration and increased susceptibility to pests.");
    }
    digitalWrite(LED_BUILTIN, LOW);
  }

  if(co2 < CO2_THRESHOLD){
    Serial.println("This amount of CO2 is enough for good plant growth");
  }
  else{
    Serial.println("Enriched level!!!! This will help our plants to grow faster and produce more!!!");
  } 

  Serial.println("");
  delay(5000);
}

void buzzBuzzerTwice() {
  for (int i = 0; i < 2; i++) {
    tone(buzzerPin, 1000, 500);
    delay(1000);                     // Wait for 1 second
    }
}

void buzzBuzzerThrice() {
  for (int i = 0; i < 3; i++) {
    tone(buzzerPin, 100, 500);
    delay(1000);                     // Wait for 1 second
  }
}