/*
 * code for LAB_3
 * 17/11/2023
 * by Farhan
 * 21DDT22F1235
 */

//libarys
#include <WiFi.h>
#include <NTPClient.h>
#include <WiFiUdp.h>
#include <LiquidCrystal_I2C.h>
#include "DHT.h"
#include <ThingSpeak.h>

//setting for dht 22 pin
#define DHTPIN 26     
#define DHTTYPE DHT22   // DHT 22  (AM2302), AM2321
DHT dht(DHTPIN, DHTTYPE);

//setting lcd i2c 16*22
LiquidCrystal_I2C lcd(0x27, 16, 2);

//ntp setting
WiFiUDP ntpUDP;
NTPClient timeClient(ntpUDP, "asia.pool.ntp.org", 28800, 60000);

//wifi setting wokwi only for real device please change your ssid and password
WiFiClient  client;
const char *ssid     = "Wokwi-GUEST";
const char *password = "";

//thingspeak config
String apiWritekey= "MABLDIAICZM22502"; // Api thingspeek write key
const char* server = "api.thingspeak.com";//server api thingspeak
const int myChannelNumber = 2347791;// channel number


//time to updated thingspeak
const int Second = 30;
const int Second_2 = 10;
const int Second_3 = 40;
const int Second_4 = 50;



void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");

  //wifi enable connection
  WiFi.disconnect();
   WiFi.begin(ssid, password);
   Serial.println();
   Serial.println();
   Serial.print("Connecting to ");
   Serial.println(ssid);
   //WiFi.begin(ssid, password);


   //check wifi status/connection
   while (WiFi.status() != WL_CONNECTED) {
    delay(5);
    Serial.print(".");
  }
  Serial.println("");
  Serial.print(" connected to wifi...");
  Serial.println(ssid);
  Serial.println();
  
  //declare wifi static mode
WiFi.mode(WIFI_STA);

//start client mode thingspeak
ThingSpeak.begin(client);

//configure lcd
lcd.init();
  lcd.backlight();
  lcd.setCursor(0,0);
  lcd.print("lab 3 v1");
  lcd.setCursor(0,1);
  lcd.print("By Nasr_2023");
  delay(1);
  lcd.clear();

}

void loop() {
  //read dht22
  int temperature = dht.readTemperature();
  int humidity = dht.readHumidity();

//ntp update reach server
timeClient.update();
Serial.println(timeClient.getFormattedTime());


//display time and values dht 22 on lcd

lcd.setCursor(0,0);
  lcd.print("    ");
  lcd.print(timeClient.getFormattedTime());


  // Check if any reads failed and exit early (to try again).
  if (isnan(temperature) || isnan(humidity)) {
    Serial.println(F("Failed to read from DHT sensor!"));
    return;
  }
  lcd.setCursor(0,1);
  lcd.print(F("Hum:"));
  lcd.print(humidity);
  lcd.print(F("% Temp:"));
  lcd.print(temperature);
  lcd.print((char)223);
  lcd.print(F("C"));



  delay(10); // this speeds up the simulation

  //read time for update
if(timeClient.isTimeSet()) {
    if (Second == timeClient.getSeconds()) {
      if (client.connect(server,80))
  { //wirte data on cloud 
    String tsData = apiWritekey;
           tsData +="&field1=";
           tsData += String(temperature);
           tsData +="&field2=";
           tsData += String(humidity);
           tsData += "\r\n\r\n";
           
     client.print("POST /update HTTP/1.1\n");
     client.print("Host: api.thingspeak.com\n");
     client.print("Connection: close\n");
     client.print("X-THINGSPEAKAPIKEY: "+apiWritekey+"\n");
     client.print("Content-Type: application/x-www-form-urlencoded\n");
     client.print("Content-Length: ");
     client.print(tsData.length());
     client.print("\n\n");  // the 2 carriage returns indicate closing of Header fields & starting of data
     client.print(tsData);
     delay (1);

    Serial.println(" Serial Write ");
    Serial.print((int)temperature); 
    Serial.print(" *C, "); 
    Serial.print((int)humidity);
    Serial.println(" H");

  }
    }
  }
}