BigTogepi
Published

RFID Activated LED

RFID tag turns on LED.

IntermediateFull instructions provided6,808
RFID Activated LED

Things used in this project

Hardware components

Arduino UNO
Arduino UNO
×1
5 mm LED: Green
5 mm LED: Green
×1
Male/Female Jumper Wires
Male/Female Jumper Wires
×1
RFID Module (Generic)
×1
9V battery (generic)
9V battery (generic)
×1
9V Battery Clip
9V Battery Clip
×1

Software apps and online services

Arduino IDE
Arduino IDE

Story

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Code

GETUID

Arduino
Get the UID of the tag.
#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
#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();
}
}

Credits

BigTogepi

BigTogepi

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