1 | /*
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2 | * ----------------------------------------------------------------------
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3 | * Example program showing how to read new NUID from a PICC to serial.
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4 | * ----------------------------------------------------------------------
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5 | * https://circuits4you.com
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6 | *
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7 | * RC522 Interfacing with NodeMCU
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8 | *
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9 | Typical pin layout used:
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10 | * ---------------------------------------------------------------------
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11 | * MFRC522 Arduino Arduino Arduino Arduino Arduino
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12 | * Reader/PCD Uno/101 Mega Nano v3 Leonardo/Micro Pro Micro
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13 | * Signal Pin Pin Pin Pin Pin Pin
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14 | * ----------------------------------------------------------------------
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15 | * RST/Reset RST 9 5 D9 RESET/ICSP-5 RST
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16 | * SPI SS SDA(SS) 10 53 D10 10 10
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17 | * SPI MOSI MOSI 11 / ICSP-4 51 D11 ICSP-4 16
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18 | * SPI MISO MISO 12 / ICSP-1 50 D12 ICSP-1 14
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19 | * SPI SCK SCK 13 / ICSP-3 52 D13 ICSP-3 15
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20 | */
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21 |
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22 | #include <SPI.h>
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23 | #include <MFRC522.h>
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24 |
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25 | constexpr uint8_t RST_PIN = 9; // Configurable, see typical pin layout above
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26 | constexpr uint8_t SS_PIN = 10; // Configurable, see typical pin layout above
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27 |
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28 | MFRC522 rfid(SS_PIN, RST_PIN); // Instance of the class
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29 |
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30 | MFRC522::MIFARE_Key key;
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31 |
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32 | // Init array that will store new NUID
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33 | byte nuidPICC[4];
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34 |
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35 | void setup() {
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36 | Serial.begin(9600);
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37 | delay(1000);
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38 | SPI.begin(); // Init SPI bus
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39 | rfid.PCD_Init(); // Init MFRC522
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40 |
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41 | for (byte i = 0; i < 6; i++) {
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42 | key.keyByte[i] = 0xFF;
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43 | }
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44 |
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45 | Serial.println(F("This code scan the MIFARE Classsic NUID."));
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46 | Serial.print(F("Using the following key:"));
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47 | printHex(key.keyByte, MFRC522::MF_KEY_SIZE);
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48 | }
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49 |
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50 | void loop() {
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51 |
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52 | // Look for new cards
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53 | if ( ! rfid.PICC_IsNewCardPresent())
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54 | return;
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55 |
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56 | // Verify if the NUID has been readed
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57 | if ( ! rfid.PICC_ReadCardSerial())
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58 | return;
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59 |
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60 | Serial.print(F("PICC type: "));
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61 | MFRC522::PICC_Type piccType = rfid.PICC_GetType(rfid.uid.sak);
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62 | Serial.println(rfid.PICC_GetTypeName(piccType));
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63 |
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64 | // Check is the PICC of Classic MIFARE type
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65 | if (piccType != MFRC522::PICC_TYPE_MIFARE_MINI &&
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66 | piccType != MFRC522::PICC_TYPE_MIFARE_1K &&
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67 | piccType != MFRC522::PICC_TYPE_MIFARE_4K) {
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68 | Serial.println(F("Your tag is not of type MIFARE Classic."));
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69 | return;
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70 | }
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71 |
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72 | if (rfid.uid.uidByte[0] != nuidPICC[0] ||
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73 | rfid.uid.uidByte[1] != nuidPICC[1] ||
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74 | rfid.uid.uidByte[2] != nuidPICC[2] ||
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75 | rfid.uid.uidByte[3] != nuidPICC[3] ) {
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76 | Serial.println(F("A new card has been detected."));
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77 |
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78 | // Store NUID into nuidPICC array
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79 | for (byte i = 0; i < 4; i++) {
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80 | nuidPICC[i] = rfid.uid.uidByte[i];
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81 | }
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82 |
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83 | /*Serial.println(F("The NUID tag is:"));
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84 | Serial.print(F("In hex: "));
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85 | printHex(rfid.uid.uidByte, rfid.uid.size);
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86 | Serial.println();
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87 | Serial.print(F("In dec: "));
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88 | printDec(rfid.uid.uidByte, rfid.uid.size);
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89 | Serial.println();
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90 | }
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91 | */
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92 | Serial.println(F(""));
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93 | //Serial.print(F(""));
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94 | printHex(rfid.uid.uidByte, rfid.uid.size);
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95 | Serial.println();
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96 |
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97 | }
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98 | else Serial.println(F("Card read previously."));
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99 |
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100 | // Halt PICC
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101 | rfid.PICC_HaltA();
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102 |
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103 | // Stop encryption on PCD
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104 | rfid.PCD_StopCrypto1();
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105 | }
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106 |
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107 |
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108 | /**
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109 | * Helper routine to dump a byte array as hex values to Serial.
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110 | */
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111 | void printHex(byte *buffer, byte bufferSize) {
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112 | for (byte i = 0; i < bufferSize; i++) {
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113 | Serial.print(buffer[i] < 0x10 ? " 0" : " ");
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114 | Serial.print(buffer[i], HEX);
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115 |
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116 | }
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117 | }
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118 |
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119 | /**
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120 | * Helper routine to dump a byte array as dec values to Serial.
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121 | */
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122 | void printDec(byte *buffer, byte bufferSize) {
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123 | for (byte i = 0; i < bufferSize; i++) {
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124 | Serial.print(buffer[i] < 0x10 ? " 0" : " ");
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125 | Serial.print(buffer[i], DEC);
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126 |
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127 | }
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128 | }
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