//when temperature is 25 to 26 degree and humidity is 60 to 70% print irrigation off led no light up buzzer no sound servo motor no move
//else led light up buzzer sound servo motor move 
//oled will print the temperature is () and humidity is ()
#include "DHT.h"
//https://github.com/adafruit/DHT-sensor-library

#include <Servo.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

#define DHTPIN 2   // Digital pin connected to the DHT sensor
#define DHTTYPE DHT22 // DHT 22  (AM2302), AM2321
DHT dht(DHTPIN, DHTTYPE);

#define SCREEN_WIDTH 128 // OLED display width,  in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels

int buzzerPin = 12; // Buzzer pin connected to 12
float hum; // Read humidity 
float temp; // Read temperature 
int pos=0; // variable to store the servo position
int angle=0; //angle = 0
Servo myservo; // create servo object to control a servo

// declare an SSD1306 display object connected to I2C
Adafruit_SSD1306 oled(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

void setup()
{
Serial.begin(9600); //begin
Serial.println("DHT22!"); //print DHT22
dht.begin(); //dht start
pinMode(buzzerPin, OUTPUT); //Code declares pin 12 as output pin
myservo.attach(9); // attaches the servo on pin 9 to the servo object
pinMode(LED_BUILTIN, OUTPUT); //Code declares pin 13 as output pin

 // initialize OLED display with address 0x3C for 128x64
  if (!oled.begin(SSD1306_SWITCHCAPVCC, 0x3C)) 
  {
    Serial.println(F("SSD1306 allocation failed"));
    while (true);
  }
 
  delay(2000);         // wait for initializing
  oled.clearDisplay(); // clear display
 
  oled.setTextSize(1);          // text size
  oled.setTextColor(WHITE);     // text color
  oled.setCursor(0, 1);        // position to display
      oled.println("Temperature is ");    //print temperature is
      oled.print(temp);                 //print temperature value
      oled.print(" Celsius,       Humidity is "); //print celsius, humidity:
      oled.print(hum);                  //print humidity value
      oled.println(" %");               //print %
}


void loop() 
{
delay(2000); //wait for initializing
    hum = dht.readHumidity(); //read humidity value
    temp= dht.readTemperature(); //read temperature value
  if (temp >= 25 && temp <=26 && (hum <= 70 && hum >=60))
  {
        Serial.print("Temperature is ");    //print temperature is
        Serial.print(temp);                 //print temperature value
        Serial.print(" Celsius, Humidity is "); //print celsius, humidity:
        Serial.print(hum);                  //print humidity value
        Serial.println(" %");               //print %
        Serial.println (" Irrigation off"); //print irrigation off
        noTone(buzzerPin);                  //buzzer no sound
      for(angle = 180; angle>=1; angle-=90) //servo motor turn 90 degree
       myservo.write(angle); //servo motor show angle
       digitalWrite(LED_BUILTIN, LOW); //led remains no light
        delay (500);
  }
  else 
  {
        Serial.print("Temperature is "); //print temperature is
        Serial.print(temp);           //print temperature value
        Serial.print(" Celsius, Humidity is "); //print celsius, humidity:
        Serial.print(hum);            //print humidity value
        Serial.println(" %");         //print %
        Serial.println (" Irrigation on"); //print irrigation on
        tone(buzzerPin, 100,1000);         //buzzer sound
        digitalWrite(LED_BUILTIN, HIGH);   //led light up
        myservo.write(pos); //servo motor moves
        delay (500);
       } 
  oled.clearDisplay();         
  oled.setTextSize(1);          
  oled.setTextColor(WHITE);    
  oled.setCursor(0, 1);
  oled.println("Temperature is"); // text to display
  oled.print(temp);                 //print temperature value
      oled.print(" Celsius,       Humidity is "); //print celsius, humidity:
      oled.print(hum);                  //print humidity value
      oled.println(" %");               //print %
  oled.display();
 
}