Fingerprint Attendance System w/ Real-time Online Data Backup

/*
  WriteMultipleFields
  
  Description: Writes values to fields 1,2,3,4 and status in a single Thingspeak update every 20 seconds.
  
  Hardware: ESP8266 based boards
  
  !!! IMPORTANT - Modify the secrets.h file for this project with your network connection and Thingspeak channel details. !!!
  
  Note:
  - Requires ESP8266WiFi library and ESP8622 board add-on. See https://github.com/esp8266/Arduino for details.
  - Select the target hardware from the Tools->Board menu
  - This example is written for a network using WPA encryption. For WEP or WPA, change the WiFi.begin() call accordingly.
  
  Thingspeak ( https://www.Thingspeak.com ) is an analytic IoT platform service that allows you to aggregate, visualize, and 
  analyze live data streams in the cloud. Visit https://www.Thingspeak.com to sign up for a free account and create a channel.  
  
  Documentation for the Thingspeak Communication Library for Arduino is in the README.md folder where the library was installed.
  See https://www.mathworks.com/help/Thingspeak/index.html for the full Thingspeak documentation.
  
  For licensing information, see the accompanying license file.
  
  Copyright 2018, The MathWorks, Inc.
*/

#include "ThingSpeak.h"
#include "secrets.h"
#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;

unsigned long myChannelNumber = SECRET_CH_ID;
const char * myWriteAPIKey = SECRET_WRITE_APIKEY;

// Initialize our values
int number1 = 0;
int number2 = random(0,100);
int number3 = random(0,100);
int number4 = random(0,100);
String myStatus = "";

void setup() {
  Serial.begin(115200);  // Initialize serial

  WiFi.mode(WIFI_STA); 
  ThingSpeak.begin(client);  // Initialize Thingspeak
}

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.");
  }

  // set the fields with the values
  ThingSpeak.setField(1, number1);
  ThingSpeak.setField(2, number2);
  ThingSpeak.setField(3, number3);
  ThingSpeak.setField(4, number4);

  // figure out the status message
  if(number1 > number2){
    myStatus = String("field1 is greater than field2"); 
  }
  else if(number1 < number2){
    myStatus = String("field1 is less than field2");
  }
  else{
    myStatus = String("field1 equals field2");
  }
  
  // set the status
  ThingSpeak.setStatus(myStatus);
  
  // write to the Thingspeak channel
  int x = ThingSpeak.writeFields(myChannelNumber, myWriteAPIKey);
  if(x == 200){
    Serial.println("Channel update successful.");
  }
  else{
    Serial.println("Problem updating channel. HTTP error code " + String(x));
  }
  
  // change the values
  number1++;
  if(number1 > 99){
    number1 = 0;
  }
  number2 = random(0,100);
  number3 = random(0,100);
  number4 = random(0,100);
  
  delay(20000); // Wait 20 seconds to update the channel again
}