#include <DHT.h>
#include <LiquidCrystal.h>
#include <WiFi.h>
#include<HTTPClient.h>
const int DHTPIN = 12;         
int PirPin = 33;          
int pirState = LOW;           
int val = 0; 
const int RS=4, E = 15, DB4 = 5, DB5 = 18, DB6 = 21, DB7 = 22;
LiquidCrystal lcd (RS,E,DB4,DB5,DB6,DB7);
int hum;
int temp;
DHT dht (DHTPIN, DHT22);
long lastTime = 0;
long timerDelay = 500;
const char ssid[] = "Wokwi-GUEST";
const char password[] = "";
String serverName = "https://api.thingspeak.com/update?api_key=VSZB6AL45UYE9ZM9";
int motionState;
void setup() {

  Serial.begin(115200);
  Serial.println("Hello, ESP32!");     
  pinMode(PirPin, INPUT);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED){
    delay(500);
    Serial.print ("-");
  }
  Serial.println("");
  Serial.print ("ESP 32 Connected\n");
  Serial.println(WiFi.localIP());
  lcd.begin(16,2);
  motionState= LOW;
  dht.begin();
}

void loop(){
  if ((millis() - lastTime) > timerDelay){
    if (WiFi.status() == WL_CONNECTED){
      val = digitalRead(PirPin); 
      hum = dht.readHumidity();
      temp = dht.readTemperature();
      //lcd.clear();
      display (temp, hum);
      
      if (val == HIGH)
      {            
        if (pirState == LOW) 
        {
          Serial.println("\nMotion detected!");
          //Serial.println(pirState);
          motionState = HIGH;
          sendData(temp, hum, motionState);
          pirState = HIGH;
          lcd.setCursor(0,1);
          lcd.print ("Motion detected!");
        }
      } 
      else 
      {
        if (pirState == HIGH)
        {
          delay(5000);
          Serial.println("\nMotion ended!");
         //Serial.println(pirState);
          motionState = LOW;
          sendData(temp, hum, motionState);
          pirState = LOW;
          lcd.setCursor(0,1);
          lcd.print ("Motion ended!    ");
        }
      }
      //Serial.println(pirState);
      sendData(temp, hum, motionState);
   }
   else{
      Serial.println("Wifi Disconnected");
   }
    lastTime = millis();
  }
  //Serial.println("-----");
  //delay(2000);


}
void display (int temp, int hum){
    Serial.print ("\nHumidity: ");
    Serial.print (hum);
    Serial.print ("\tTemperature: ");
    Serial.print(temp);
    lcd.setCursor(0,0);
    lcd.print ("Hum: ");
    lcd.print(hum);
    lcd.print ("\tTemp: ");
    lcd.print(temp);
    lcd.setCursor(0,1);
    lcd.print ("                 ");
}

void sendData ( int temp, int hum, int motionState){
  HTTPClient http;
  Serial.print("\nMotion: ");
  Serial.println(motionState);
  String url = serverName + "&field1=" + hum + "&field2=" + temp  + "&field3=" + motionState;
  http.begin(url.c_str());
  int httpResponseCode = http.GET();
  if (httpResponseCode>0){
    Serial.print ("\nHTTP Response Code: ");
    Serial.println(httpResponseCode);

  }
  else{
    Serial.print ("Error Code");
    Serial.println(httpResponseCode);

  }
  http.end();
  //delay(3000);
}