Add files via upload

Author: jobitjoseph

Interfacing RFID Reader With Arduino/Code/LED_Control/LED_Control.ino

@@ -0,0 +1,57 @@
+#include <SPI.h>
+#include <MFRC522.h>
+
+#define SS_PIN 10
+#define RST_PIN 9
+#define LED 8
+
+byte readCard[4];
+String tag_UID = "39C3BB99";  // Replace this with the UID of your tag!!!
+String tagID = "";
+
+MFRC522 mfrc522(SS_PIN, RST_PIN); // Create MFRC522 instance
+
+void setup()
+{ 
+  pinMode(LED, OUTPUT);// initialize digital pin LED_BUILTIN as an output.
+  digitalWrite(LED, LOW);    // turn the LED off by making the voltage LOW
+  SPI.begin(); // SPI bus
+  mfrc522.PCD_Init(); // Initialise MFRC522
+}
+
+void loop()
+{
+  //Wait until new tag is available
+  while (readID())
+  {
+    if (tagID == tag_UID)
+    {
+      digitalWrite(LED, !digitalRead(LED));  // Turn on or off the onboard led
+    }
+  }
+}
+
+  //Read new tag if available
+boolean readID()
+  {
+    //Check if a new tag is detected or not. If not return.
+    if ( ! mfrc522.PICC_IsNewCardPresent())
+    {
+      return false;
+    }
+    //Check if a new tag is readable or not. If not return.
+    if ( ! mfrc522.PICC_ReadCardSerial())
+    {
+      return false;
+    }
+    tagID = "";
+    // Read the 4 byte UID
+    for ( uint8_t i = 0; i < 4; i++)
+    {
+      //readCard[i] = mfrc522.uid.uidByte[i];
+      tagID.concat(String(mfrc522.uid.uidByte[i], HEX)); // Convert the UID to a single String
+    }
+    tagID.toUpperCase();
+    mfrc522.PICC_HaltA(); // Stop reading
+    return true;
+  }

Interfacing RFID Reader With Arduino/Code/Write/Write.ino

@@ -0,0 +1,127 @@
+#include <SPI.h>      //include the SPI library
+#include <MFRC522.h>  //include the MFRC522 RFID reader library
+
+#define RST_PIN 9  //reset pin, which can be changed to another digital pin if needed.
+#define SS_PIN 10  //SS or the slave select pin, which can be changed to another digital pin if needed.
+
+MFRC522 mfrc522(SS_PIN, RST_PIN);  // create a MFRC522 instant.
+MFRC522::MIFARE_Key key;          //create a MIFARE_Key struct named 'key' to hold the card information
+
+byte data1[14] = {"Circuit-Digest"};  //The first data that needs to be written to the tag.
+byte data2[12] = {"Jobit-Joseph"};  //The second data that needs to be written to the tag.
+byte readbackblock[18];  //Array for reading out a block.
+
+void setup()
+{
+  Serial.begin(115200);        // Initialize serial communications with the PC
+  SPI.begin();               // Init SPI bus
+  mfrc522.PCD_Init();        // Init MFRC522 card (in case you wonder what PCD means: proximity coupling device)
+  Serial.println("Scan a MIFARE Classic card");
+
+  for (byte i = 0; i < 6; i++)
+  {
+    key.keyByte[i] = 0xFF;  // Prepare the security key for the read and write operations.
+  }
+}
+
+void loop()
+{
+  // Look for new cards if not found rerun the loop function
+  if ( ! mfrc522.PICC_IsNewCardPresent()) {
+    return;
+  }
+
+  // read from the card if not found rerun the loop function
+  if ( ! mfrc522.PICC_ReadCardSerial())
+  {
+    return;
+  }
+  Serial.println("card detected. Writing data");
+  writeBlock(1, data1); //write data1 to the block 1 of the tag
+  writeBlock(2, data2); //write data2 to the block 2 of the tag
+
+  Serial.println("reading data from the tag");
+  readBlock(1, readbackblock);   //read block 1
+  //print data
+  Serial.print("read block 1: ");
+  for (int j = 0 ; j < 14 ; j++)
+  {
+    Serial.write (readbackblock[j]);
+  }
+  Serial.println("");
+  readBlock(2, readbackblock);  //read block 2
+  //print data
+  Serial.print("read block 2: ");
+  for (int j = 0 ; j < 12 ; j++)
+  {
+    Serial.write (readbackblock[j]);
+  }
+  Serial.println("");
+
+  //mfrc522.PICC_DumpToSerial(&(mfrc522.uid));//uncomment below line if want to see the entire memory dump.
+
+
+}
+
+
+
+//Write specific block
+int writeBlock(int blockNumber, byte arrayAddress[])
+{
+  //check if the block number corresponds to data block or triler block, rtuen with error if it's trailer block.
+  int largestModulo4Number = blockNumber / 4 * 4;
+  int trailerBlock = largestModulo4Number + 3; //determine trailer block for the sector
+  if (blockNumber > 2 && (blockNumber + 1) % 4 == 0) {
+    Serial.print(blockNumber);
+    Serial.println(" is a trailer block: Error");
+    return 2;
+  }
+  
+
+  //authentication
+  byte status = mfrc522.PCD_Authenticate(MFRC522::PICC_CMD_MF_AUTH_KEY_A, trailerBlock, &key, &(mfrc522.uid));
+  if (status != MFRC522::STATUS_OK) {
+    Serial.print("Authentication failed: ");
+    Serial.println(mfrc522.GetStatusCodeName(status));
+    return 3;//return "3" as error message
+  }
+
+  //writing data to the block
+  status = mfrc522.MIFARE_Write(blockNumber, arrayAddress, 16);
+  //status = mfrc522.MIFARE_Write(9, value1Block, 16);
+  if (status != MFRC522::STATUS_OK) {
+    Serial.print("Data write failed: ");
+    Serial.println(mfrc522.GetStatusCodeName(status));
+    return 4;//return "4" as error message
+  }
+  Serial.print("Data written to block ");
+  Serial.println(blockNumber);
+}
+
+
+
+//Read specific block
+int readBlock(int blockNumber, byte arrayAddress[])
+{
+  int largestModulo4Number = blockNumber / 4 * 4;
+  int trailerBlock = largestModulo4Number + 3; //determine trailer block for the sector
+
+  //authentication of the desired block for access
+  byte status = mfrc522.PCD_Authenticate(MFRC522::PICC_CMD_MF_AUTH_KEY_A, trailerBlock, &key, &(mfrc522.uid));
+
+  if (status != MFRC522::STATUS_OK) {
+    Serial.print("Authentication failed : ");
+    Serial.println(mfrc522.GetStatusCodeName(status));
+    return 3;//return "3" as error message
+  }
+
+  //reading data from the block
+  byte buffersize = 18;
+  status = mfrc522.MIFARE_Read(blockNumber, arrayAddress, &buffersize);//&buffersize is a pointer to the buffersize variable; MIFARE_Read requires a pointer instead of just a number
+  if (status != MFRC522::STATUS_OK) {
+    Serial.print("Data read failed: ");
+    Serial.println(mfrc522.GetStatusCodeName(status));
+    return 4;//return "4" as error message
+  }
+  Serial.println("Data read successfully");
+}