Hi!, I bought a RFID-RC522 Module for my udoo I use this miguelbalboa library (https://github.com/miguelbalboa/rfid) and I follow the this pin connection: MOSI: Pin 51 / ICSP-4 MISO: Pin 50 / ICSP-1 SCK : Pin 52 / ISCP-3 SS : Pin 53 (Configurable) RST : Pin 5 (Configurable) 3.3v: Pin 3.3v gnd: Ping GND and i use this code: #include <SPI.h> #include <MFRC522.h> #define SS_PIN 53 #define RST_PIN 5 MFRC522 mfrc522(SS_PIN, RST_PIN); // Create MFRC522 instance. void setup() { Serial.begin(9600); // Initialize serial communications with the PC SPI.begin(); // Init SPI bus mfrc522.PCD_Init(); // Init MFRC522 card Serial.println("Scan PICC to see UID and type..."); } void loop() { // Look for new cards if ( ! mfrc522.PICC_IsNewCardPresent()) { return; } // Select one of the cards if ( ! mfrc522.PICC_ReadCardSerial()) { return; } // Dump debug info about the card. PICC_HaltA() is automatically called. mfrc522.PICC_DumpToSerial(&(mfrc522.uid)); } but the rfid don't work i did not understand if the rfid don't work or i don't linked corret the pin can someone help me?