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  1. /*
  2.  * --------------------------------------------------------------------------------------------------------------------
  3.  * Example sketch/program showing how to read data from a PICC to serial.
  4.  * --------------------------------------------------------------------------------------------------------------------
  5.  * This is a MFRC522 library example; for further details and other examples see: https://github.com/miguelbalboa/rfid
  6.  *
  7.  * Example sketch/program showing how to read data from a PICC (that is: a RFID Tag or Card) using a MFRC522 based RFID
  8.  * Reader on the Arduino SPI interface.
  9.  *
  10.  * When the Arduino and the MFRC522 module are connected (see the pin layout below), load this sketch into Arduino IDE
  11.  * then verify/compile and upload it. To see the output: use Tools, Serial Monitor of the IDE (hit Ctrl+Shft+M). When
  12.  * you present a PICC (that is: a RFID Tag or Card) at reading distance of the MFRC522 Reader/PCD, the serial output
  13.  * will show the ID/UID, type and any data blocks it can read. Note: you may see "Timeout in communication" messages
  14.  * when removing the PICC from reading distance too early.
  15.  *
  16.  * If your reader supports it, this sketch/program will read all the PICCs presented (that is: multiple tag reading).
  17.  * So if you stack two or more PICCs on top of each other and present them to the reader, it will first output all
  18.  * details of the first and then the next PICC. Note that this may take some time as all data blocks are dumped, so
  19.  * keep the PICCs at reading distance until complete.
  20.  *
  21.  * @license Released into the public domain.
  22.  *
  23.  * Typical pin layout used:
  24.  * -----------------------------------------------------------------------------------------
  25.  *             MFRC522      Arduino       Arduino   Arduino    Arduino          Arduino
  26.  *             Reader/PCD   Uno/101       Mega      Nano v3    Leonardo/Micro   Pro Micro
  27.  * Signal      Pin          Pin           Pin       Pin        Pin              Pin
  28.  * -----------------------------------------------------------------------------------------
  29.  * RST/Reset   RST          9             5         D9         RESET/ICSP-5     RST
  30.  * SPI SS      SDA(SS)      10            53        D10        10               10
  31.  * SPI MOSI    MOSI         11 / ICSP-4   51        D11        ICSP-4           16
  32.  * SPI MISO    MISO         12 / ICSP-1   50        D12        ICSP-1           14
  33.  * SPI SCK     SCK          13 / ICSP-3   52        D13        ICSP-3           15
  34.  */
  35.  
  36. #include <SPI.h>
  37. #include <MFRC522.h>
  38.  
  39. #define RST_PIN         9          // Configurable, see typical pin layout above
  40. #define SS_PIN          10         // Configurable, see typical pin layout above
  41.  
  42. MFRC522 mfrc522(SS_PIN, RST_PIN);  // Create MFRC522 instance
  43.  
  44. void setup() {
  45.     Serial.begin(9600);     // Initialize serial communications with the PC
  46.     while (!Serial);        // Do nothing if no serial port is opened (added for Arduinos based on ATMEGA32U4)
  47.     SPI.begin();            // Init SPI bus
  48.     mfrc522.PCD_Init();     // Init MFRC522
  49.     mfrc522.PCD_DumpVersionToSerial();  // Show details of PCD - MFRC522 Card Reader details
  50.     Serial.println(F("Scan PICC to see UID, SAK, type, and data blocks..."));
  51. }
  52.  
  53. void loop() {
  54.     // Look for new cards
  55.     if ( ! mfrc522.PICC_IsNewCardPresent()) {
  56.         return;
  57.     }
  58.  
  59.     // Select one of the cards
  60.     if ( ! mfrc522.PICC_ReadCardSerial()) {
  61.         return;
  62.     }
  63.  
  64.     // Dump debug info about the card; PICC_HaltA() is automatically called
  65.     mfrc522.PICC_DumpToSerial(&(mfrc522.uid));
  66. }
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