#include <WiFi.h>
#include <ThingSpeak.h> // Library for ThingSpeak integration
const char* ssid = "Wokwi-GUEST"; // Replace with your Wi-Fi SSID
const char* password = ""; // Replace with your Wi-Fi password
// ThingSpeak settings
unsigned long channelID =  2715922; // Replace with your ThingSpeak channel ID
const char* writeAPIKey = "99TP6NOLCKYAPFES"; // Replace with your ThingSpeak write API key

WiFiClient client; // Declare the client object

#include "DHTesp.h"

const int DHT_PIN = 15;
const int buz_PIN = 12;
DHTesp dhtSensor;

// #include <Wire.h> 
// #include <LiquidCrystal_I2C.h>
// LiquidCrystal_I2C lcd(0x27,16,2);
#include <LiquidCrystal.h>
const int rs = 23;
const int en = 22;
const int d4 = 21;
const int d5 = 19;
const int d6 = 18;
const int d7 = 5;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);

#define relay 2
const int pirPin = 13; // PIR sensor digital output pin
void setup()
{
    // Set PIR sensor pin as input
  pinMode(pirPin, INPUT);
  pinMode(relay, OUTPUT);
  pinMode(buz_PIN, OUTPUT);
  //Wire.begin(23, 22);// lcd pins 
  Serial.begin(115200);
 lcd.begin(16, 2);
  // lcd.init();//
  // lcd.backlight();

   dhtSensor.setup(DHT_PIN, DHTesp::DHT22);

   // Connect to Wi-Fi
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to Wi-Fi...");
  }
  Serial.println("Connected to Wi-Fi!");

  // Initialize ThingSpeak
  ThingSpeak.begin(client);

}
void DHT_sensor()
{
  TempAndHumidity  data = dhtSensor.getTempAndHumidity();
  Serial.println("Temp: " + String(data.temperature, 2) + "°C");
  Serial.println("Humidity: " + String(data.humidity, 1) + "%");
  Serial.println("---");
  
  ThingSpeak.setField(1, data.temperature); // Field 1 for temperature
  ThingSpeak.setField(2, data.humidity); // Field 2 for humidity
    int response = ThingSpeak.writeFields(channelID, writeAPIKey);

  if (response == 200) {
    Serial.println("Data sent to ThingSpeak successfully!");
  } else {
    Serial.println("Error sending data to ThingSpeak. HTTP error code: " + String(response));
  }

  lcd.setCursor ( 0, 0 );
  lcd.print ( "Temp: " );
  lcd.print ( String(data.temperature, 2)+ "°C");
  lcd.setCursor ( 0, 1 );
  lcd.print ( "Humidity:" );
  lcd.print ( String(data.humidity, 1) + "%");
  if(data.temperature>30)
  {
   digitalWrite(relay, HIGH);
   digitalWrite(buz_PIN, HIGH);
  }
  else
  {
   digitalWrite(relay, LOW);
   digitalWrite(buz_PIN, LOW);
  }
  
  delay(1000); // Wait for a new reading from the sensor (DHT22 has ~0.5Hz sample rate)
}
void loop()
{
  int16_t i = analogRead(34);
   ThingSpeak.setField(3, i); // Field 3 for soil irrigation
  String msg = i < 2165 ? "WET" : i > 3135 ? "DRY" : "OK";
  lcd.clear();
  lcd.print("Soil: ");
  lcd.print(msg); 
  delay(500); 
  lcd.clear();
  DHT_sensor();
  motionSensor();
}
int pirState = LOW;
void motionSensor()
{
   int val = digitalRead(pirPin);  // read input value
  if (val == HIGH) {            // check if the input is HIGH
    digitalWrite(relay, HIGH);  // turn LED ON
    digitalWrite(buz_PIN, HIGH);
    if (pirState == LOW) {
      // we have just turned on
      Serial.println("Motion detected!");
      // We only want to print on the output change, not state
      pirState = HIGH;
    }
  } else {
    digitalWrite(relay, LOW); // turn LED OFF
    digitalWrite(buz_PIN, LOW);
    if (pirState == HIGH) {
      // we have just turned of
      Serial.println("Motion ended!");
      // We only want to print on the output change, not state
      pirState = LOW;
    }
  }
}