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#include <Wire.h> #include <LiquidCrystal_I2C.h> #include <SPI.h> #include <MFRC522.h> #define RST_PIN 5 // Connect RST to digital pin 5 MFRC522 mfrc522; // Create MFRC522 instance LiquidCrystal_I2C lcd(0x27,16,2); // set the LCD address to 0x27 for a 16 chars and 2 line display void setup() { Serial.begin(9600); // Initialize serial communications with the PC SPI.begin(); // Init SPI bus mfrc522.PCD_Init(); // Init MFRC522 card lcd.init(); // initialize the lcd lcd.backlight(); lcd.setCursor(3,0); lcd.print("Hello, world!"); } void loop() { // Look for new cards if ( ! mfrc522.PICC_IsNewCardPresent() || ! mfrc522.PICC_ReadCardSerial() ) { delay(50); return; } // Show UID on serial monitor Serial.print("UID tag :"); String content= ""; byte letter; for (byte i = 0; i < mfrc522.uid.size; i++) { Serial.print(mfrc522.uid.uidByte[i] < 0x10 ? " 0" : " "); Serial.print(mfrc522.uid.uidByte[i], HEX); content.concat(String(mfrc522.uid.uidByte[i] < 0x10 ? " 0" : " ")); content.concat(String(mfrc522.uid.uidByte[i], HEX)); } Serial.println(); Serial.print("Message : "); content.toUpperCase(); lcd.clear(); lcd.setCursor(0,0); lcd.print("Card UID:"); lcd.setCursor(0,1); lcd.print(content.substring(1)); delay(1500); }
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