RFID Activated LED

RFID tag turns on LED.

Jan 4, 2020

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remote control

Devices & Components

Arduino Uno Rev3

5 mm LED: Green

RFID Module (Generic)

Male/Female Jumper Wires

9V battery (generic)

9V Battery Clip

Software & Tools

Arduino IDE

Project description

Code

GETUID

arduino

Get the UID of the tag.

1#include <SPI.h>
2#include <MFRC522.h>
3 
4#define SS_PIN 10
5#define  RST_PIN 9
6 
7MFRC522 rfid(SS_PIN, RST_PIN); // Instance of the class
8 
9MFRC522::MIFARE_Key  key;
10
11void printHex(byte *buffer, byte bufferSize) {
12  for (byte i = 0;  i < bufferSize; i++) {
13    Serial.print(buffer[i] < 0x10 ? " 0" : " ");
14    Serial.print(buffer[i], HEX);
15  }
16}
17
18// Init array that will store  UID
19byte uid[4];
20 
21void setup() {
22  Serial.begin(9600);
23  SPI.begin();  // Init SPI bus
24  rfid.PCD_Init(); // Init MFRC522
25  for (byte i = 0; i <  6; i++) {
26    key.keyByte[i] = 0xFF;
27  }
28}
29 
30void loop() {
31if  (rfid.PICC_IsNewCardPresent() && rfid.PICC_ReadCardSerial()){
32 for (byte i =  0; i < 4; i++) {
33      uid[i] = rfid.uid.uidByte[i];
34 }
35 printHex(rfid.uid.uidByte,  rfid.uid.size);
36 Serial.println();
37 rfid.PICC_HaltA();
38 rfid.PCD_StopCrypto1();
39}
40

#include <SPI.h>
#include <MFRC522.h>
 
#define SS_PIN 10
#define  RST_PIN 9
 
MFRC522 rfid(SS_PIN, RST_PIN); // Instance of the class
 
MFRC522::MIFARE_Key  key;

void printHex(byte *buffer, byte bufferSize) {
  for (byte i = 0;  i < bufferSize; i++) {
    Serial.print(buffer[i] < 0x10 ? " 0" : " ");
    Serial.print(buffer[i], HEX);
  }
}

// Init array that will store  UID
byte uid[4];
 
void setup() {
  Serial.begin(9600);
  SPI.begin();  // Init SPI bus
  rfid.PCD_Init(); // Init MFRC522
  for (byte i = 0; i <  6; i++) {
    key.keyByte[i] = 0xFF;
  }
}
 
void loop() {
if  (rfid.PICC_IsNewCardPresent() && rfid.PICC_ReadCardSerial()){
 for (byte i =  0; i < 4; i++) {
      uid[i] = rfid.uid.uidByte[i];
 }
 printHex(rfid.uid.uidByte,  rfid.uid.size);
 Serial.println();
 rfid.PICC_HaltA();
 rfid.PCD_StopCrypto1();
}

GETUID

arduino

Get the UID of the tag.

1#include <SPI.h>
2#include <MFRC522.h>
3 
4#define SS_PIN 10
5#define   RST_PIN 9
6 
7MFRC522 rfid(SS_PIN, RST_PIN); // Instance of the class
8 
9MFRC522::MIFARE_Key   key;
10
11void printHex(byte *buffer, byte bufferSize) {
12  for (byte i = 0;   i < bufferSize; i++) {
13    Serial.print(buffer[i] < 0x10 ? " 0" : " ");
14     Serial.print(buffer[i], HEX);
15  }
16}
17
18// Init array that will store   UID
19byte uid[4];
20 
21void setup() {
22  Serial.begin(9600);
23  SPI.begin();   // Init SPI bus
24  rfid.PCD_Init(); // Init MFRC522
25  for (byte i = 0; i <   6; i++) {
26    key.keyByte[i] = 0xFF;
27  }
28}
29 
30void loop() {
31if   (rfid.PICC_IsNewCardPresent() && rfid.PICC_ReadCardSerial()){
32 for (byte i =   0; i < 4; i++) {
33      uid[i] = rfid.uid.uidByte[i];
34 }
35 printHex(rfid.uid.uidByte,   rfid.uid.size);
36 Serial.println();
37 rfid.PICC_HaltA();
38 rfid.PCD_StopCrypto1();
39}
40

#include <SPI.h>
#include <MFRC522.h>
 
#define SS_PIN 10
#define   RST_PIN 9
 
MFRC522 rfid(SS_PIN, RST_PIN); // Instance of the class
 
MFRC522::MIFARE_Key   key;

void printHex(byte *buffer, byte bufferSize) {
  for (byte i = 0;   i < bufferSize; i++) {
    Serial.print(buffer[i] < 0x10 ? " 0" : " ");
     Serial.print(buffer[i], HEX);
  }
}

// Init array that will store   UID
byte uid[4];
 
void setup() {
  Serial.begin(9600);
  SPI.begin();   // Init SPI bus
  rfid.PCD_Init(); // Init MFRC522
  for (byte i = 0; i <   6; i++) {
    key.keyByte[i] = 0xFF;
  }
}
 
void loop() {
if   (rfid.PICC_IsNewCardPresent() && rfid.PICC_ReadCardSerial()){
 for (byte i =   0; i < 4; i++) {
      uid[i] = rfid.uid.uidByte[i];
 }
 printHex(rfid.uid.uidByte,   rfid.uid.size);
 Serial.println();
 rfid.PICC_HaltA();
 rfid.PCD_StopCrypto1();
}

RFIDLED

arduino

Turn the LED on with the RFID tag

1#include <SPI.h>
2#include <MFRC522.h>
3 
4#define SS_PIN 10
5#define  RST_PIN 9
6
7int ledPin = 6;
8
9MFRC522 rfid(SS_PIN, RST_PIN); // Instance  of the class
10 
11MFRC522::MIFARE_Key key;
12 
13// Init array that will store  UID
14byte uid[4];
15
16void printHex(byte *buffer, byte bufferSize) {
17  for  (byte i = 0; i < bufferSize; i++) {
18    Serial.print(buffer[i] < 0x10 ? " 0"  : " ");
19    Serial.print(buffer[i], HEX);
20  }
21}
22
23void setup() {
24  digitalWrite(ledPin, LOW);
25  Serial.begin(9600);
26  SPI.begin(); // Init  SPI bus
27  rfid.PCD_Init(); // Init MFRC522
28  for (byte i = 0; i < 6; i++)  {
29    key.keyByte[i] = 0xFF;
30  }
31}
32 
33void loop() {
34if (rfid.PICC_IsNewCardPresent()  && rfid.PICC_ReadCardSerial()){
35 for (byte i = 0; i < 4; i++) {
36      uid[i]  = rfid.uid.uidByte[i];
37 }
38 printHex(rfid.uid.uidByte, rfid.uid.size);
39  digitalWrite(ledPin, HIGH);
40 rfid.PICC_HaltA();
41 rfid.PCD_StopCrypto1();
42}
43}
44  
45

#include <SPI.h>
#include <MFRC522.h>
 
#define SS_PIN 10
#define  RST_PIN 9

int ledPin = 6;

MFRC522 rfid(SS_PIN, RST_PIN); // Instance  of the class
 
MFRC522::MIFARE_Key key;
 
// Init array that will store  UID
byte uid[4];

void printHex(byte *buffer, byte bufferSize) {
  for  (byte i = 0; i < bufferSize; i++) {
    Serial.print(buffer[i] < 0x10 ? " 0"  : " ");
    Serial.print(buffer[i], HEX);
  }
}

void setup() {
  digitalWrite(ledPin, LOW);
  Serial.begin(9600);
  SPI.begin(); // Init  SPI bus
  rfid.PCD_Init(); // Init MFRC522
  for (byte i = 0; i < 6; i++)  {
    key.keyByte[i] = 0xFF;
  }
}
 
void loop() {
if (rfid.PICC_IsNewCardPresent()  && rfid.PICC_ReadCardSerial()){
 for (byte i = 0; i < 4; i++) {
      uid[i]  = rfid.uid.uidByte[i];
 }
 printHex(rfid.uid.uidByte, rfid.uid.size);
  digitalWrite(ledPin, HIGH);
 rfid.PICC_HaltA();
 rfid.PCD_StopCrypto1();
}
}

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