// This project implements the simulation of the reading a DHT sensor using an ESP32 
// The source code is available on my git repo at : https://github.com/Bamamou/DHT11_ESP32.git
// the only difference is the sensor, Here; we use a DHT11 while in Platform io we use a DHT22
#include <DHT.h>  
#include <LiquidCrystal_I2C.h> // LCD librairy.h>
#include <WiFi.h>   
#include <ThingSpeak.h>            // Menambahkan Library ThingSpeak

//===============================================================================
// Set up the DHT sensor  and LCD
const int DHT_Pin =4;                            // The DHT pin 
//float temperature ;                             // Sensor temperature
//float  humidity;                               // Sensor Humidity

DHT dht(DHT_Pin, DHT22); // If you are using the DHT22, you just need to change the value 11 to 22
LiquidCrystal_I2C lcd(0x27,16,2);  // Define the lcd object from the liduidCrystal class


//---------------------Enter wifi credentials -----------------//
const char* ssid     = "Wokwi-GUEST";    //Name of your wifi network
const char* password = "";  // Wifi password

/* Change these values based on your calibration values */
int soilWet = 65;        // Define max value we consider soil 'wet'   
int soilDry = 35;        // Define min value we consider soil 'dry'

#define sensorPin 34     //connect the sensor to analog pin of esp8266
#define motorPin 12
float humidity = 0.0 ;
float temperature = 0.0 ;


//---------------------Channel Details--------------------//
unsigned long Channel_ID = 2120064; // Channel ID
const char *WriteAPIKey = "ZGVIX21EHA36G6ES"; // Your write API Key
WiFiClient  client;

//#define DHTPIN 2              //D4 pin
//#define DHTTYPE DHT11
//DHT dht(DHTPIN, DHTTYPE);
long delayStart = millis();   // start delay

void setup() {
   pinMode(motorPin, OUTPUT);
   digitalWrite(motorPin, LOW);
   Serial.begin(9600); 
   Serial.println();
   Serial.print("Connecting to ");
   Serial.println(ssid);
   Serial.begin(9600);
   Serial.println("Hello, ESP32!");
   lcd.init();                        // Initialize the LCD          
   lcd.backlight();                  // Turn on the back light
   lcd.clear();                     // clear everything from the screen
   
  // lcd.begin();      
   ///lcd.backlight();
   lcd.setCursor(0,0);
   lcd.print("Smart Irrigation" );
   lcd.setCursor(0,1);
   lcd.print("     System" );
   WiFi.begin(ssid, password);  // Connecting esp to wifi
   while (WiFi.status() != WL_CONNECTED)  //This loop will work untill esp connects to the wifi
   {   
   delay(500);
   Serial.print(".");
   }
   ThingSpeak.begin(client);       //The client here is esp8266 
  delay(1000);
  lcd.clear();
  }

void loop() {
  int moisture = analogRead(sensorPin);    //Read the analog values
  moisture = map(moisture, 0, 1024, 100, 0);
  humidity = dht.readHumidity();
  temperature = dht.readTemperature();
   //get the reading from the function below and print it
  Serial.print("Soil moisture: ");  //Print the analog values
  Serial.println(moisture);
  Serial.print("Humidity : ");
  Serial.println(humidity);
  Serial.print("Temperature :");
  Serial.println(temperature);
  if ((millis() - delayStart) >= 15000) {
  ThingSpeak.writeField(Channel_ID,1,moisture, WriteAPIKey);
  ThingSpeak.writeField(Channel_ID,2,temperature, WriteAPIKey);  
  ThingSpeak.writeField(Channel_ID,3,humidity, WriteAPIKey);
  
  lcd.setCursor(0,0);  
  lcd.print("Humidity : ");
  lcd.print(humidity);  
  lcd.setCursor(0,1);  
  lcd.print("Moisture : ");
  lcd.print(moisture);
  // Determine status of our soil using the values already defined for wet and dry soil
  if (moisture > soilWet) 
  {
    Serial.println("Status: Tanah terlalu basah");
    digitalWrite(motorPin, LOW);
    ThingSpeak.writeField(Channel_ID,4, false, WriteAPIKey);
  } 
  else if (moisture <= soilWet && moisture > soilDry) 
  {
    Serial.println("Status: Kelembapan bagus");
    digitalWrite(motorPin, LOW); 
    ThingSpeak.writeField(Channel_ID,4, false, WriteAPIKey); 
  } 
  else 
  {
    Serial.println("Status: Tanah terlalu kering - waktunya Menyiram!");
    digitalWrite(motorPin, LOW);
    lcd.clear();
    lcd.setCursor(0,0);
    lcd.print("Menyiram...");
    delay(5000);
    digitalWrite(motorPin, HIGH);
    lcd.clear();
    ThingSpeak.writeField(Channel_ID,4, false, WriteAPIKey);

  }
} 
delay(500);                // Take a reading every  half a second for testing
Serial.println();          // Normally you should take reading perhaps once or twice a day

}