View difference between Paste ID: sthMhHJ7 and E4vPkp0d

 #include <SPI.h> //
 #include <SD.h> //
 #include <Wire.h> //
 #include "RTClib.h" //
 #include <MFRC522.h> //
 #include <LiquidCrystal_I2C.h>
 
 LiquidCrystal_I2C lcd(0x27,16,2);
 #define SS_PIN 8 // 10 for shield // 8 for normal small module
 #define RST_PIN 9 // FOR RFID READER
 MFRC522 mfrc522(SS_PIN, RST_PIN);   // Create MFRC522 instance.
 
 
 //-------------------------------------------------------------------------USER # 1
 String user001ID = "09 2A 13 A3";
 boolean user001Status = true;
 //-------------------------------------------------------------------------
 
 //-------------------------------------------------------------------------USER # 2
 String user002ID = "D4 A0 30 2A";
 boolean user002Status = true;
 //-------------------------------------------------------------------------
 
 
 // A simple data logger for the Arduino analog pins
 
 // how many milliseconds between grabbing data and logging it. 1000 ms is once a second
 #define LOG_INTERVAL  1000 // mills between entries (reduce to take more/faster data)
 
 // how many milliseconds before writing the logged data permanently to disk
 // set it to the LOG_INTERVAL to write each time (safest)
 // set it to 10*LOG_INTERVAL to write all data every 10 datareads, you could lose up to
 // the last 10 reads if power is lost but it uses less power and is much faster!
 #define SYNC_INTERVAL 1000 // mills between calls to flush() - to write data to the card
 uint32_t syncTime = 0; // time of last sync()
 int buttonReading = 1;
 #define ECHO_TO_SERIAL   1 // echo data to serial port
 #define WAIT_TO_START    0 // Wait for serial input in setup()
 
 
 RTC_DS1307 RTC; // define the Real Time Clock object
 
 // for the data logging shield, we use digital pin 10 for the SD cs line
 const int chipSelect = 10;
 
 // the logging file
 File logfile;
 
 void error(char *str)
 {
   Serial.print("error: ");
   Serial.println(str);
 
   while (1);
 }
 
 void setup(void)
 {
   lcd.init();
   lcd.init();
   lcd.backlight();
   lcd.print("Connecting...");
   Serial.begin(9600);
   Serial.println();
   SPI.begin();      // Initiate  SPI bus
   mfrc522.PCD_Init();   // Initiate MFRC522
   pinMode(7, OUTPUT);
 #if WAIT_TO_START
   Serial.println("Type any character to start");
   while (!Serial.available());
 #endif //WAIT_TO_START
 
   // initialize the SD card
   Serial.print("Initializing SD card...");
   // make sure that the default chip select pin is set to
   // output, even if you don't use it:
   pinMode(10, OUTPUT);
   //  pinMode(buttonPin, INPUT);
   // see if the card is present and can be initialized:
   if (!SD.begin(chipSelect)) {
     error("Card failed, or not present");
   }
   Serial.println("card initialized.");
 
   // create a new file
   char filename[] = "LOGGER00.CSV";
   for (uint8_t i = 0; i < 100; i++) {
     filename[6] = i / 10 + '0';
     filename[7] = i % 10 + '0';
     if (! SD.exists(filename)) {
       // only open a new file if it doesn't exist
       logfile = SD.open(filename, FILE_WRITE);
       break;  // leave the loop!
     }
   }
 
   if (! logfile) {
     error("couldnt create file");
   }
 
   Serial.print("Logging to: ");
   Serial.println(filename);
 
   // connect to RTC
   Wire.begin();
   if (!RTC.begin()) {
     logfile.println("RTC failed");
 #if ECHO_TO_SERIAL
     Serial.println("RTC failed");
 #endif  //ECHO_TO_SERIAL
   }
 
 
   logfile.println("Date,Time,Log");
 #if ECHO_TO_SERIAL
   Serial.println("Date-Time,Status");
 #endif //ECHO_TO_SERIAL
 
   delay(2000);
   lcd.clear();
   lcd.print("System Ready");
   delay(2500);
   lcd.clear();
   lcd.setCursor(0, 0);
   lcd.print("Log:");
 }
 
 void loop()
 {
   // Look for new cards
   if ( ! mfrc522.PICC_IsNewCardPresent())
   {
     return;
   }
   // Select one of the cards
   if ( ! mfrc522.PICC_ReadCardSerial())
   {
     return;
   }
   //Show UID on serial monitor
   String content = "";
   byte letter;
   buzz();
   for (byte i = 0; i < mfrc522.uid.size; i++)
   {
     Serial.print(mfrc522.uid.uidByte[i] < 0x10 ? " 0" : " ");
     Serial.print(mfrc522.uid.uidByte[i], HEX);
     content.concat(String(mfrc522.uid.uidByte[i] < 0x10 ? " 0" : " "));
     content.concat(String(mfrc522.uid.uidByte[i], HEX));
   }
   Serial.println();
   content.toUpperCase();
 
   ///////////////////////////////////////////////////////////////////////// User #001 /start
   if (content.substring(1) == user001ID)
   {
     if (user001Status == true) {
       user001Status = false;
       //Serial.println("Shahad Just Signed IN");
       DateTime now;
       // fetch the time
       now = RTC.now();
       // log time
       logfile.print('"');
       logfile.print(now.year(), DEC);
       logfile.print("/");
       logfile.print(now.month(), DEC);
       logfile.print("/");
       logfile.print(now.day(), DEC);
       logfile.print('"');
       logfile.print(",");
       logfile.print(now.hour(), DEC);
       logfile.print(":");
       logfile.print(now.minute(), DEC);
       logfile.print(":");
       logfile.print(now.second(), DEC);
 #if ECHO_TO_SERIAL
       Serial.print('"');
       Serial.print(now.year(), DEC);
       Serial.print("/");
       Serial.print(now.month(), DEC);
       Serial.print("/");
       Serial.print(now.day(), DEC);
       Serial.print(" ");
       Serial.print(now.hour(), DEC);
       Serial.print(":");
       Serial.print(now.minute(), DEC);
       Serial.print(":");
       Serial.print(now.second(), DEC);
       Serial.print('"');
 #endif //ECHO_TO_SERIAL
 
       delay(10);
 
       logfile.print(", ");
       logfile.print("Shahad Just Signed IN");
 #if ECHO_TO_SERIAL
       Serial.print(", ");
       Serial.print("Shahad Just Signed IN");
       lcd.setCursor(0, 1);
       lcd.print("Shahad-Sign IN");
       delay(3000);
       lcd.setCursor(0, 1);
       lcd.print("                ");
 #endif //ECHO_TO_SERIAL
       logfile.println();
 #if ECHO_TO_SERIAL
       Serial.println();
 #endif // ECHO_TO_SERIAL
       // Now we write data to disk! Don't sync too often - requires 2048 bytes of I/O to SD card
       // which uses a bunch of power and takes time
       if ((millis() - syncTime) < SYNC_INTERVAL) return;
       syncTime = millis();
       // blink LED to show we are syncing data to the card & updating FAT!
       logfile.flush();
       delay(1000);
     }
     else if (user001Status == false) {
       user001Status = true;
       //Serial.println("User 001 Just Signed OUT");
       DateTime now;
       // fetch the time
       now = RTC.now();
       // log time
       logfile.print('"');
       logfile.print(now.year(), DEC);
       logfile.print("/");
       logfile.print(now.month(), DEC);
       logfile.print("/");
       logfile.print(now.day(), DEC);
       logfile.print('"');
       logfile.print(",");
       logfile.print(now.hour(), DEC);
       logfile.print(":");
       logfile.print(now.minute(), DEC);
       logfile.print(":");
       logfile.print(now.second(), DEC);
 #if ECHO_TO_SERIAL
       Serial.print('"');
       Serial.print(now.year(), DEC);
       Serial.print("/");
       Serial.print(now.month(), DEC);
       Serial.print("/");
       Serial.print(now.day(), DEC);
       Serial.print(" ");
       Serial.print(now.hour(), DEC);
       Serial.print(":");
       Serial.print(now.minute(), DEC);
       Serial.print(":");
       Serial.print(now.second(), DEC);
       Serial.print('"');
 #endif //ECHO_TO_SERIAL
 
       delay(10);
 
       logfile.print(", ");
       logfile.print("Shahad Just Signed OUT");
 #if ECHO_TO_SERIAL
       Serial.print(", ");
       Serial.print("Shahad Just Signed OUT");
       lcd.setCursor(0, 1);
       lcd.print("Shahad-Sign OUT");
       delay(3000);
       lcd.setCursor(0, 1);
       lcd.print("                ");
 #endif //ECHO_TO_SERIAL
       logfile.println();
 #if ECHO_TO_SERIAL
       Serial.println();
 #endif // ECHO_TO_SERIAL
       // Now we write data to disk! Don't sync too often - requires 2048 bytes of I/O to SD card
       // which uses a bunch of power and takes time
       if ((millis() - syncTime) < SYNC_INTERVAL) return;
       syncTime = millis();
       // blink LED to show we are syncing data to the card & updating FAT!
       logfile.flush();
       delay(1000);
     }
   }
   ///////////////////////////////////////////////////////////////////////// User #001 /end
 
   ///////////////////////////////////////////////////////////////////////// User #002 /start       //***** [1]
 
   if (content.substring(1) == user002ID)                              //***** [2]
   {
     if (user002Status == true) {                                      //***** [3]
       user002Status = false;                                          //***** [4]
 
       DateTime now;
       now = RTC.now();
       logfile.print('"');
       logfile.print(now.year(), DEC);
       logfile.print("/");
       logfile.print(now.month(), DEC);
       logfile.print("/");
       logfile.print(now.day(), DEC);
       logfile.print('"');
       logfile.print(",");
       logfile.print(now.hour(), DEC);
       logfile.print(":");
       logfile.print(now.minute(), DEC);
       logfile.print(":");
       logfile.print(now.second(), DEC);
 #if ECHO_TO_SERIAL
       Serial.print('"');
       Serial.print(now.year(), DEC);
       Serial.print("/");
       Serial.print(now.month(), DEC);
       Serial.print("/");
       Serial.print(now.day(), DEC);
       Serial.print(" ");
       Serial.print(now.hour(), DEC);
       Serial.print(":");
       Serial.print(now.minute(), DEC);
       Serial.print(":");
       Serial.print(now.second(), DEC);
       Serial.print('"');
 #endif //ECHO_TO_SERIAL
       delay(10);
       logfile.print(", ");
       logfile.print("Ayat Alshaabani Just Signed IN");                           //***** [5]
 #if ECHO_TO_SERIAL
       Serial.print(", ");
       Serial.print("Ayat Just Signed IN");                            //***** [6]
       lcd.setCursor(0, 1);
       //        "1234567891234567"    16x characters only #######
       lcd.print("Ayat-Sign IN ");                                      //***** [7]
       delay(3000);
       lcd.setCursor(0, 1);
       lcd.print("                ");
 #endif //ECHO_TO_SERIAL
       logfile.println();
 #if ECHO_TO_SERIAL
       Serial.println();
 #endif // ECHO_TO_SERIAL
       if ((millis() - syncTime) < SYNC_INTERVAL) return;
       syncTime = millis();
       logfile.flush();
       delay(1000);
     }
     else if (user002Status == false) {                                //***** [8]
       user002Status = true;                                           //***** [9]
       DateTime now;
       now = RTC.now();
       logfile.print('"');
       logfile.print(now.year(), DEC);
       logfile.print("/");
       logfile.print(now.month(), DEC);
       logfile.print("/");
       logfile.print(now.day(), DEC);
       logfile.print('"');
       logfile.print(",");
       logfile.print(now.hour(), DEC);
       logfile.print(":");
       logfile.print(now.minute(), DEC);
       logfile.print(":");
       logfile.print(now.second(), DEC);
 #if ECHO_TO_SERIAL
       Serial.print('"');
       Serial.print(now.year(), DEC);
       Serial.print("/");
       Serial.print(now.month(), DEC);
       Serial.print("/");
       Serial.print(now.day(), DEC);
       Serial.print(" ");
       Serial.print(now.hour(), DEC);
       Serial.print(":");
       Serial.print(now.minute(), DEC);
       Serial.print(":");
       Serial.print(now.second(), DEC);
       Serial.print('"');
 #endif //ECHO_TO_SERIAL
       delay(10);
       logfile.print(", ");
       logfile.print("Ayat Alshaabani Just Signed OUT");                          //***** [10]
 #if ECHO_TO_SERIAL
       Serial.print(", ");
       Serial.print("Ayat Just Signed OUT");                           //***** [11]
       lcd.setCursor(0, 1);
       //        "1234567891234567"    16x characters only #######
       lcd.print("Ayat-Sign OUT");                                      //***** [12]
       delay(3000);
       lcd.setCursor(0, 1);
       lcd.print("                ");
 #endif //ECHO_TO_SERIAL
       logfile.println();
 #if ECHO_TO_SERIAL
       Serial.println();
 #endif // ECHO_TO_SERIAL
       if ((millis() - syncTime) < SYNC_INTERVAL) return;
       syncTime = millis();
       logfile.flush();
       delay(1000);
     }
   }
   ///////////////////////////////////////////////////////////////////////// User #002 /end      //***** [13]
 
 }// end of LOOP
 
 
 void buzz() {
   digitalWrite(7, 1);
   delay(100);
   digitalWrite(7, 0);
   delay(50);
 
 }