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

int dhtpin = 2;
float Temperature;
float Humidity; 

DHT dht22(dhtpin, DHT22);
LiquidCrystal_I2C lcd(0x27, 20, 4);

const int Soilmoisturepin = A0;
const int airQualitypin = A1;
const int UVlightpin = A2;
const int LDRpin = A3;
const int Waterpumprelay = 3;
const int Fanrelay = 4;
const int Growlightrelay = 5; 
const int buzzerpin = 6;


int soilMoisturelimit = 500; 
int airQualitylimit = 600;   
int uvLightlimit = 200;      
int lightlimit = 400;       
int temperaturelimit = 30;

void setup() {
Serial.begin(9600);
dht22.begin();

pinMode(Soilmoisturepin, INPUT);
pinMode(airQualitypin, INPUT);
pinMode(UVlightpin, INPUT);
pinMode(LDRpin, INPUT);

pinMode(Waterpumprelay, OUTPUT);
pinMode(Fanrelay, OUTPUT);
pinMode(Growlightrelay, OUTPUT);  
pinMode(buzzerpin, OUTPUT);

lcd.init();
lcd.backlight();
lcd.setCursor(0,0);
lcd.print("Plant Monitoring");
delay(2000);

}

void loop() {
int Soilmoisturevalue = analogRead(Soilmoisturepin);
int Airqualityvalue = analogRead(airQualitypin);
int UVvalue = analogRead(UVlightpin);
int ldrvalue = analogRead(LDRpin);


Temperature = dht22.readTemperature();
Humidity = dht22.readHumidity();


Serial.print("Soil Moisture: "); 
Serial.println(Soilmoisturevalue);
Serial.print("Air Quality: "); 
Serial.println(Airqualityvalue);
Serial.print("UV Light: "); 
Serial.println(UVvalue);
Serial.print("Light Level: "); 
Serial.println(ldrvalue);
Serial.print("Humidity: "); 
Serial.println(Humidity);
Serial.print("Temperature: "); 
Serial.println(Temperature);

lcd.clear();
lcd.setCursor(0, 0);
lcd.print("Temp: "); lcd.print(Temperature); lcd.print("C ");
lcd.print("Hum: "); lcd.print(Humidity); lcd.print("%");
lcd.setCursor(0, 1);
lcd.print("Soil: "); lcd.print(Soilmoisturevalue);
lcd.setCursor(0, 2);
lcd.print("Air Quality: "); lcd.print(Airqualityvalue);
lcd.setCursor(0, 3);
lcd.print("UV: "); lcd.print(UVvalue);
lcd.print(" Light: "); lcd.print(ldrvalue);

if (Soilmoisturevalue < soilMoisturelimit) {
  digitalWrite(Waterpumprelay,HIGH); 
  Serial.println("Water Pump ON");
  } else {
  digitalWrite(Waterpumprelay, LOW);
  Serial.println("Water Pump OFF");
  }

  if (Temperature > temperaturelimit) {
  digitalWrite(Fanrelay, HIGH);
  digitalWrite(buzzerpin, HIGH);
  Serial.println("Fan ON");   
}else if(Temperature < 2){
digitalWrite(Fanrelay, LOW);
digitalWrite(buzzerpin, HIGH);
Serial.println("Buzzer ON!!!!... , Temperature below 2°C");
} 
else {
  digitalWrite(Fanrelay, LOW);
  Serial.println("Fan OFF");
}

if (Humidity < 50) { 
Serial.println("Humidity too low!.,."); 
digitalWrite(buzzerpin, HIGH);
} else if (Humidity > 80) { 
Serial.println("Humidity too high!..."); 
digitalWrite(buzzerpin, HIGH); 
digitalWrite(Fanrelay, HIGH);
} else
{
Serial.println("Humidity is optimal."); 
digitalWrite(buzzerpin, LOW);
digitalWrite(Fanrelay,LOW);
}


if (UVvalue < uvLightlimit || ldrvalue < lightlimit ) {
digitalWrite(Growlightrelay, HIGH);
Serial.println("Grow Light ON");
}else {
digitalWrite(Growlightrelay, LOW); 
Serial.println("Grow Light OFF");
}

if (Airqualityvalue < 300) {
lcd.print("Air: Good   ");  
} else if (Airqualityvalue < airQualitylimit) {
lcd.print("Air: Moderate");  
} else {
lcd.print("Air: Poor    ");  
digitalWrite(buzzerpin, HIGH);    
}


  delay(2000);
}