#include <WiFi.h>
#include <NTPClient.h>
#include <WiFiUdp.h>
#include <LiquidCrystal_I2C.h>
#include "DHT.h"
#include <ThingSpeak.h>
#define DHTPIN 26     
#define DHTTYPE DHT22   // DHT 22  (AM2302), AM2321
DHT dht(DHTPIN, DHTTYPE);
LiquidCrystal_I2C lcd(0x27, 16, 2);

WiFiUDP ntpUDP;
NTPClient timeClient(ntpUDP, "asia.pool.ntp.org", 28800, 60000);
// Wifi network station credentials
//#define WIFI_SSID "Wokwi-GUEST"
//#define WIFI_PASSWORD ""
WiFiClient  client;
const char *ssid     = "Wokwi-GUEST";
const char *password = "";
//thing speak

String apiWritekey= "B64QE8KRZ1ZLNL8G"; // Api thingspeek write key
const char* server = "api.thingspeak.com";//server api thingspeak
const int myChannelNumber = 1611109;// channel number


//masa utk update thingspeaks
const int Second = 11;
const int Second2 = 21;
const int Second3 = 31;
const int Second4 = 41;
const int Second5 = 51;
const int Second6 = 0;
//flag only for triger
int dataupdate_flag= 0;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  //serial monitor enable
 
 //connecting to ssid notification  
   WiFi.disconnect();
   WiFi.begin(ssid, password);
   Serial.println();
   Serial.println();
   Serial.print("Connecting to ");
   Serial.println(ssid);
   WiFi.begin(ssid, password);


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

//lcd test
//
lcd.init();
  lcd.backlight();
  lcd.setCursor(0,0);
  lcd.print("lab 3 v1");
  lcd.setCursor(0,1);
  lcd.print("By Nasrul_2023");
  delay(1000);
  lcd.clear();
}

void loop() {
  //read sensor and display on lcd time with tem& humi
 int temperature = dht.readTemperature();
 int humidity = dht.readHumidity();
  timeClient.update();
  Serial.println(timeClient.getFormattedTime());
  //delay(1000);
  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"));

  // Wait a few seconds between measurements.
 delay(1);

 //read time for update
if(timeClient.isTimeSet()) {
    if (Second == timeClient.getSeconds()) {
     dataupdate_flag= 1;
    }
     if (Second2 == timeClient.getSeconds()) {
     dataupdate_flag=1;
    }
     if (Second3 == timeClient.getSeconds()) {
     dataupdate_flag= 1;
    }
     if (Second4 == timeClient.getSeconds()) {
     dataupdate_flag=1;
    }
        if (Second5 == timeClient.getSeconds()) {
     dataupdate_flag=1;
    }
     if (Second6 == timeClient.getSeconds()) {
     dataupdate_flag=1;
    }
  if (client.connect(server,80))
  { //wirte data on cloud 
  if(dataupdate_flag==1){
    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 (100);

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

dataupdate_flag= 0;

  }



}