OLED + RFID reader

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Short example of reading RFID/NFC cards by RC522/MFRC522 module and display it on OLED display (4-wire SPI). Everything is wired directly with breadboard wires to the Espruino Pico board. No external power supply needed. Just Plugin to USB Port or power by USB battery pack.
Table of Contents SPI OLED + RFID RC522 Hardware Wiring OLED display Wiring RFID RC522 module Initialize OLED display Initialize RFID module Read RFID cards

SPI OLED + RFID RC522 (#link)

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Hardware

• SPI OLED display (aliexpress)
• RFID RC522 module (aliexpress)

Wiring OLED display

OLED	Pico
GND	A5
VCC	A7
SCL	B13
SDA	B15
RST	B14
D/C	A6

Wiring RFID RC522 module

RC522	Pico
GND	GND
VCC	VDD
CS/SS/SDA	B1
SCK	B3
MISO	B4
MOSI	B5

Initialize OLED display

var spi = new SPI();
spi.setup({mosi: B15, sck:B13});
// OLED driver and graphic library
var g = require("SSD1306").connectSPI(spi, A6, B14, function() {
  // display is connected...
  // do something 
});

Initialize RFID module

We use the SPI1 port of the Espruino Pico board.

// initial SPI1 for MRFC522 NFC module
  SPI1.setup({sck:B3, miso:B4, mosi:B5 });
  var nfc = require("MFRC522").connect(SPI1, B1/*CS*/);

Read RFID cards

// find cards
nfc.findCards(function(card) {
  print("Found card "+card);
  card = JSON.stringify(card);
  if (card=="[4,19,153,221]") digitalPulse(LED1,1,500);
  if (card=="[0,121,205,3]")  digitalPulse(LED2,1,500);
});