IOT based visitor counter

#define SECRET_SSID    "    "  //Wifi credentials to connect to network
#define SECRET_PASS    "      "
#define CHANNEL_ID                //Your channel id
#define WRITE_APIKEY   "       "   //Api key


#include <WiFiClient.h>

WiFiClient wifiClient;

#include <ESP8266HTTPClient.h>
#include "ThingSpeak.h"


//pin declarartions and global variables declarations
int irPin=2;
int irPin1=13;
int led = 4;
int count=0;
int count1=0,lft=0;
int val1=0,val2=0;
int mag = 0;


//Tweet credential declarations
String host = "api.thingspeak.com";
int httpPort = 80;  
String url = "/apps/thingtweet/1/statuses/update";

HTTPClient http; 


unsigned long myChannelNumber = CHANNEL_ID;
const char * myWriteAPIKey = WRITE_APIKEY;

#include <ESP8266WiFi.h>

char ssid[] = SECRET_SSID;   // your network SSID (name)
char pass[] = SECRET_PASS;   // your network password
int keyIndex = 0;            // your network key index number (needed only for WEP)
WiFiClient  client;

void setup() {
  pinMode(irPin, INPUT);
  pinMode(irPin1, INPUT);
  pinMode(led,OUTPUT);
  Serial.begin(115200);
  delay(100);
  

  WiFi.mode(WIFI_STA);

  ThingSpeak.begin(client);
}



void loop() {
  
  // Connect or reconnect to WiFi
  if (WiFi.status() != WL_CONNECTED) {
    Serial.print("Attempting to connect to SSID: ");
    Serial.println(SECRET_SSID);
    while (WiFi.status() != WL_CONNECTED) {
      WiFi.begin(ssid, pass); // Connect to WPA/WPA2 network. Change this line if using open or WEP network
      Serial.print(".");
      delay(5000);
    }
    Serial.println("\nConnected.");
  }

  
  
  val1=digitalRead(irPin);
  //Entry counter
  if(val1 == LOW)
  {
    count++;
    Serial.print("People Entering: ");
    Serial.println(count);
    lft=count-count1;
    Serial.print("People in room: ");
    Serial.println(lft);
   
    ThingSpeak.writeField(myChannelNumber, 1,  count, myWriteAPIKey);
  
    delay(500);
   // digitalWrite(led,LOW);

    
  }

  //Exit counter
  val2=digitalRead(irPin1);
  if(val2 == LOW)
  {
    count1++;
    Serial.print("People  Leaving: ");
    Serial.println(count1);
    lft=count-count1;
    Serial.print("People in room: ");
    Serial.println(lft);
    
    ThingSpeak.writeField(myChannelNumber, 2,  count1, myWriteAPIKey);
    

    delay(500);
   // digitalWrite(led,LOW);
  }

  //digitalWrite(led,LOW);
  
  delay(50);

  ThingSpeak.writeField(myChannelNumber, 3,  lft, myWriteAPIKey);

  delay(100);

  //Tweet if 10 people have entered
  if(lft == 10)
  {
    
    http.begin(wifiClient,host,httpPort,url); 
    String RequestBody = "api_key=6R3LW6MNGC3MSAC2&status=10 people have entered the room!";
    int httpCode = http.POST(RequestBody);
    //Serial.println(httpCode);
    delay(2000);
  }



  //Glow led and serial monitor print if more than 20 people have entered.
  if(lft > 20)
  {
    digitalWrite(led,HIGH);
  }
  else
  {
    digitalWrite(led,LOW);
  }

  

  delay(500);
}