Anon's NFC project

Anon's Arduino NFC Project

====Contents====
1.1 - Design
1.2 - Parts used
1.3 - Source code
1.3.1 - Tag setup
1.3.2 - Tag write
1.3.3 - Tag read
================

===1.1===
Aim of the project is to create an NFC reader that will be used as a sign in/sign out system in which the log of people leaving and entering is written to a log paired with a timestamp; one tap, and you're signed out - another tap, and you're signed back in. All users have a personalized NFC tag that has their name on it. Once the tag is read, a timestamp is fetched and attached to the user's interaction, and saved to a .csv file.

===1.2===
-Arduino Uno
-Adafruit PN532_I2C NFC shield
-Mifare classic 1k tags
-USB A-B cable
-Windows 7/10 PC

===1.3===

===1.3.1===
NFC tag Setup - formats new tags into the NDEF standard
[Section Complete]

#include <PN532.h>
#include <PN532_I2C.h>
#include <NfcAdapter.h>

PN532_I2C pn532_i2c(Wire);
NfcAdapter nfc = NfcAdapter(pn532_i2c);

void setup(){
  Serial.begin(9600);
  Serial.println("Mifare Classic tag formatter");
  nfc.begin();

} //End of setup

void loop(){
  Serial.println("\nPlace and hold a MiFare Classic tag on the reader...");

  if (nfc.tagPresent()){

    bool success = nfc.format(); //Use nfc.format() to format into NDEF, and nfc.clean() to restore it back to its original format
    if (success){
      Serial.println("Success!");
    }
    else{
      Serial.println("Fail!");
    }
  }
  delay(2000);
} //End of loop

===1.3.2===
NFC tag write - Writes desired data into tags
[Section complete]

#include <Wire.h>

#include <PN532.h>
#include <PN532_I2C.h>
#include <NfcAdapter.h>

PN532_I2C pn532_i2c(Wire);
NfcAdapter nfc = NfcAdapter(pn532_i2c);

void setup() {
  Serial.begin(9600);
  Serial.println("NFC Tag setup v1.0.0"); //Header
  nfc.begin();

}//End of setup

void loop() {
  Serial.println("\nPlace and hold a tag to write...");

  if(nfc.tagPresent()){ //If a tag is present, this function will run

     NdefMessage message = NdefMessage();
     message.addUriRecord("Anon"); //First name
     message.addUriRecord("Anonson"); //Last name
     message.addUriRecord("13.2"); //Tutor
     message.addUriRecord("No lessons"); //Reason


     bool writeSuccess = nfc.write(message); //Boolean variable that stores the condition for writing data to the tag; intended to differentiate from "formatSuccess"
     if (writeSuccess){
      Serial.println("Data write successful!"); //This will display if the write was successful
     }
     else{
      Serial.println("Data write failed!"); //This will display if the write was not successful
     }//End of success function

    }//End of nfc.tagPresent() function
    delay(3000);
  }//End of loop

===1.3.3===
NFC tag read - Reads data from tags and pairs with timestamp, then prepares for it to be logged on the PC
[Still needs to implement time stamps]

#include <Wire.h> //Required to interface with I2C devices, in this case the NFC shield
#include <time.h> //Library used to get the time in order to attach a timestamp for each scan

#include <PN532.h>
#include <PN532_I2C.h>
#include <NfcAdapter.h>

PN532_I2C pn532_i2c(Wire);
NfcAdapter nfc = NfcAdapter(pn532_i2c);

void setup(){
  Serial.begin(9600); //Set the baud rate to 9,600bps
  Serial.println("NFC Sign in/out v.1.0.0"); //Header displayed at the top of the program
  nfc.begin(); //Initialises the NFC module

}//End of setup

void loop(){
Serial.println("\nWaiting for tag...\n");

  if(nfc.tagPresent()){ //If a tag is detected, this function will run
    Serial.println("Tag found!");
    NfcTag tag = nfc.read();
    Serial.println(tag.getTagType()); //Determines the type of tag, e.g. MiFare Classic
    Serial.print("UID - ");
    Serial.println(tag.getUidString()); //Fetches the tag's UID

    if (tag.hasNdefMessage()){ //If the tag contains an NDEF-formatted message, this function will run
      NdefMessage message = tag.getNdefMessage();
      Serial.print("Number of records - ");
      Serial.print(message.getRecordCount()); //Fetches number of stored records
      Serial.println("\n");

      //If more than 1 record is present, the program will run through each one
      int recordCount = message.getRecordCount();
      for (int i = 0; i < recordCount; i++){
        Serial.print("Record #");
        Serial.print(i+1);
        NdefRecord record = message.getRecord(i);

        int payloadLength = record.getPayloadLength();
        byte payload[payloadLength];
        record.getPayload(payload);

        String payloadToString = ""; //Converts the record from Hex to String
        for (int j = 0; j < payloadLength; j++){
          payloadToString += (char)payload[j];

        }//End of payloadToString for loop
        Serial.print(" - ");
        Serial.println(payloadToString);

      }//End of recordCount for loop

    }//End of tag.hasNdefMessage() function

  }//End of nfc.tagPresent() function
  delay(3000);
}//End of loop