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//Special Thanks to Brian Lough for creating the wonderful YoutubeAPI library which ended up being the base of this code
//Code modified to work as a subscriber counting device by ESCcrasci from esccrasci.in
//Replace the SSID, PWD, API KEY and CHANNEL ID below for smooth running.
//Works with a 16*2 LCD with I2C
//Will soon be made available as a kit with a onetime no-code system. Feel free to follow me on twitter to be notified when that happens! @ESCcrasci


#include <ESP8266WiFi.h>
#include <WiFiClientSecure.h>
#include <YoutubeApi.h>
#include <ArduinoJson.h>
#include <LiquidCrystal_I2C.h>
#include <Wire.h>
LiquidCrystal_I2C lcd(0x27, 16, 2);

//------- Replace the following! ------
char ssid[] = "xxxx";       // your network SSID (name)
char password[] = "xxxxxxx";  // your network key
#define API_KEY "ABCDEFGHIJKLMNOPQRSTUVWXYZ"  // your google apps API Token
#define CHANNEL_ID "AAAAAAA" // makes up the url of channel
//------- ---------------------- ------

WiFiClientSecure client;
YoutubeApi api(API_KEY, client);

unsigned long timeBetweenRequests = 1000;
unsigned long nextRunTime;

// #define subscriberCount String

long subs = 0;

void setup() {

  Serial.begin(115200);
   Wire.begin(5, 4);

  // Set WiFi to station mode and disconnect from an AP if it was Previously
  // connected
  WiFi.mode(WIFI_STA);
  WiFi.disconnect();
  delay(100);

  // Attempt to connect to Wifi network:
  Serial.print("Connecting Wifi: ");
  Serial.println(ssid);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    Serial.print(".");
    delay(500);
  }
  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  IPAddress ip = WiFi.localIP();
  Serial.println(ip);

  // Required if you are using ESP8266 V2.5 or above
  client.setInsecure();

  // If you want to enable some extra debugging
  api._debug = true;
    lcd.init();
  lcd.display();
  lcd.backlight();
  lcd.print("ESCcrasci");
}

void loop() {

  //lcd.clear();
  lcd.setCursor(0, 0);
  if (millis() > nextRunTime)  {
    if(api.getChannelStatistics(CHANNEL_ID))
    {
      //lcd.println("---------Stats---------");
      lcd.println("Subscriber Count:");
      lcd.setCursor(0,1);
      lcd.println(api.channelStats.subscriberCount);
      Serial.println(api.channelStats.subscriberCount);
      Serial.println("------------------------");

    }
    nextRunTime = millis() + timeBetweenRequests;
  }
}