#include "LiquidCrystal_I2C.h"
#include "DHT.h"

#define DHTPIN 4     // Digital pin connected to the DHT sensor
//#define DHTTYPE DHT11   // DHT 11
#define DHTTYPE DHT22   // DHT 22  (AM2302), AM2321
//#define DHTTYPE DHT21   // DHT 21 (AM2301)
int soilPin = 34;
int ledPin = 2;

LiquidCrystal_I2C lcd(0x27, 20, 4); 
DHT dht(DHTPIN, DHTTYPE);

int soilValue = 0;

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

  pinMode(ledPin, OUTPUT);

  lcd.init();
  lcd.backlight();

  Serial.println(F("DHTxx test!"));
  dht.begin();
}

void loop() 
{
//===================Soil===============
// Reading potentiometer value
  soilValue = analogRead(soilPin);

if (soilValue <= 0)
{
  Serial.print(F("Dry"));
  lcd.setCursor(3, 3);
  lcd.print("Dry");
  digitalWrite(ledPin, HIGH);  // turn the LED on (HIGH is the voltage level)
  delay(3000);                      // wait for a second
  digitalWrite(ledPin, LOW);   // turn the LED off by making the voltage LOW
  delay(3000);     
}
else if (soilValue > 0 && soilValue <= 60 )
{
  Serial.print(F("Semi Wet"));
  lcd.setCursor(3, 3);
  lcd.print("Semi Wet");
  digitalWrite(ledPin, HIGH);  // turn the LED on (HIGH is the voltage level)
  delay(1000);                      // wait for a second
  digitalWrite(ledPin, LOW);   // turn the LED off by making the voltage LOW
  delay(1000);     
}
else if (soilValue >60 )
{
  Serial.print(F("Heavy Wet"));
  lcd.setCursor(3, 3);
  lcd.print("Heavy Wet");
  digitalWrite(ledPin, HIGH);  // turn the LED on (HIGH is the voltage level)
  delay(500);                      // wait for a second
  digitalWrite(ledPin, LOW);   // turn the LED off by making the voltage LOW
  delay(500);     
}

//============================================

//=============DHT11=========================
  // Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
  float h = dht.readHumidity();
  // Read temperature as Celsius (the default)
  float t = dht.readTemperature();
  // Read temperature as Fahrenheit (isFahrenheit = true)
  float f = dht.readTemperature(true);

  // Check if any reads failed and exit early (to try again).
  if (isnan(h) || isnan(t) || isnan(f)) {
    Serial.println(F("Failed to read from DHT sensor!"));
    return;
  }
//============================================
  Serial.print(F("Hum : "));
  Serial.print(h);

  lcd.setCursor(1, 0);
  lcd.print("Hum = ");
  lcd.print(h);
  lcd.print("%");

  Serial.print(F("%  Temperature: "));
  Serial.print(t);
  Serial.print(F("°C"));

  lcd.setCursor(1, 1);
  lcd.print("Temp = ");
  lcd.print(t);
  lcd.print("°C");

  Serial.println(soilValue);
  lcd.setCursor(1, 2);
  lcd.print("Soil = ");
  lcd.print(soilValue);

   delay(1000);
}

/*
 1. Dry 0
 2. Semi Wet >0 <60
 3. Too Much 100

 0 - 4095
*/