arduino-rfid-ssd1306.ino

/*
 * --------------------------------------------------------------------------------------------------------------------
 * Example sketch/program showing how to read new NUID from a PICC to serial.
 * --------------------------------------------------------------------------------------------------------------------
 * This is a MFRC522 library example; for further details and other examples see: https://github.com/miguelbalboa/rfid
 * 
 * Example sketch/program showing how to the read data from a PICC (that is: a RFID Tag or Card) using a MFRC522 based RFID
 * Reader on the Arduino SPI interface.
 * 
 * When the Arduino and the MFRC522 module are connected (see the pin layout below), load this sketch into Arduino IDE
 * then verify/compile and upload it. To see the output: use Tools, Serial Monitor of the IDE (hit Ctrl+Shft+M). When
 * you present a PICC (that is: a RFID Tag or Card) at reading distance of the MFRC522 Reader/PCD, the serial output
 * will show the type, and the NUID if a new card has been detected. Note: you may see "Timeout in communication" messages
 * when removing the PICC from reading distance too early.
 * 
 * @license Released into the public domain.
 * 
 * Typical pin layout used:
 * -----------------------------------------------------------------------------------------
 *             MFRC522      Arduino       Arduino   Arduino    Arduino          Arduino
 *             Reader/PCD   Uno/101       Mega      Nano v3    Leonardo/Micro   Pro Micro
 * Signal      Pin          Pin           Pin       Pin        Pin              Pin
 * -----------------------------------------------------------------------------------------
 * RST/Reset   RST          9             5         D9         RESET/ICSP-5     RST
 * SPI SS      SDA(SS)      10            53        D10        10               10
 * SPI MOSI    MOSI         11 / ICSP-4   51        D11        ICSP-4           16
 * SPI MISO    MISO         12 / ICSP-1   50        D12        ICSP-1           14
 * SPI SCK     SCK          13 / ICSP-3   52        D13        ICSP-3           15
 *
 * More pin layouts for other boards can be found here: https://github.com/miguelbalboa/rfid#pin-layout
 */

#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <MFRC522.h>

#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#define OLED_RESET    -1
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

#define SS_PIN 10
#define RST_PIN 9
MFRC522 mfrc522(SS_PIN, RST_PIN);

void setup() {
  Serial.begin(9600);
  SPI.begin();
  mfrc522.PCD_Init();

  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("SSD1306 allocation failed"));
    for (;;);
  }
  display.display();
  delay(2000);

  displayWaitingScreen();
}

void loop() {
  if (!mfrc522.PICC_IsNewCardPresent() || !mfrc522.PICC_ReadCardSerial()) {
    return;
  }

  displayCardInfo();
  
  mfrc522.PICC_HaltA();
}

void displayWaitingScreen() {
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  
  // Draw frame
  display.drawRect(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT, SSD1306_WHITE);
  
  display.setCursor(10, 20);
  display.println("Waiting for RFID...");
  display.setCursor(10, 35);
  display.println("Please scan a card");
  display.display();
}

void displayCardInfo() {
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  
  // Draw frame
  display.drawRect(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT, SSD1306_WHITE);
  
  // Header
  display.setCursor(5, 2);
  display.println("RFID Card Detected");
  display.drawLine(0, 10, SCREEN_WIDTH, 10, SSD1306_WHITE);
  
  // UID
  display.setCursor(5, 14);
  display.print("UID:");
  for (byte i = 0; i < mfrc522.uid.size; i++) {
    display.print(mfrc522.uid.uidByte[i] < 0x10 ? " 0" : " ");
    display.print(mfrc522.uid.uidByte[i], HEX);
  }
  
  // Card type
  MFRC522::PICC_Type piccType = mfrc522.PICC_GetType(mfrc522.uid.sak);
  display.setCursor(5, 24);
  display.print("Type: ");
  display.println(mfrc522.PICC_GetTypeName(piccType));
  
  // UID size
  display.setCursor(5, 34);
  display.print("UID Size: ");
  display.print(mfrc522.uid.size);
  display.println(" bytes");
  
  // SAK (Select Acknowledge)
  display.setCursor(5, 44);
  display.print("SAK: 0x");
  display.println(mfrc522.uid.sak, HEX);
  
  // Footer
  display.drawLine(0, 54, SCREEN_WIDTH, 54, SSD1306_WHITE);
  display.setCursor(5, 56);
  display.println("Scan another card...");
  
  display.display();
  
  // Print to Serial Monitor
  Serial.print("Card UID:");
  for (byte i = 0; i < mfrc522.uid.size; i++) {
    Serial.print(mfrc522.uid.uidByte[i] < 0x10 ? " 0" : " ");
    Serial.print(mfrc522.uid.uidByte[i], HEX);
  }
  Serial.println();
  Serial.print("Card type: ");
  Serial.println(mfrc522.PICC_GetTypeName(piccType));
}