RFID

Overview¶

Read data from RFID RC522

Example

An example project for the Arduino IDE can be downloaded: RFID-PICC.ino (download here)

ESP Board	rfid
	SW303

Activating the component¶

The component has a dip switch SW303 for activating the RFID reader. The switch is connected to the following io ports:

Function	SWITCH	IO port	Conflicts with
RST	1	22	Audio, SW306-4, DIN; mikroBus, SW404-5, SCL; Camera, SW400-6, SIOC/SCL
IRQ	2	12	Gyro, SW310-2, AD0/SD0; mikroBus, SW404-1, PWM; Camera, SW402-3, D1; SD Card, SW406-2, DAT; Grove Digital1, SW206-1, IIO12
MISO	3	19	Gyro, SW310-3, SDA/SDI; OLED, SW309-4, SDA; TFT, SW314-1, MISO; mikroBus, SW405-2, MISO; Unit-Bus, SW200-2, CN212 - PIN 2; Grove I2C, SW203-1, I2C - SDA
MOSI	4	23	Motor, SW304-2, STEP; TFT, SW311-4, MOSI; TFT, SW314-4, T_DIN; mikroBus, SW405-1, MOSI
SCL	5	18	Microphone, SW301-3, WS; RFID, SW303-5, SCL; TFT, SW311-5, SCK; TFT, SW314-2, T_CLK; mikroBus, SW405-3, SCK; Grove Digital4, SW209-1, IO18
SDA	6	5	Microphone, SW301-1; TFT, SW311-2, RESET; Grove Digital1, SW206-2, IO5

Using the component¶

Info

Required libraries

In order to use the component you need the MFRC522-Library. The latested version could be download from the GitHub repository. If you want to use the version from GitHub download a zip archiv. Addtionally you could download a tested version. After the download it's necessary to add the library to your Arduino IDE. Open Sketch > Include Library > Add .ZIP Library ... and select the downloaded archive. After a sucessful installation the menu Sketch > Include Library should contain an entry MFRC522 in the category Contributed libraries.

Setup the component¶

void setup() {
  Serial.begin(115200);       // Initialize serial communications with the PC
  while (!Serial);        // Do nothing if no serial port is opened (added for Arduinos based on ATMEGA32U4)
  SPI.begin();            // Init SPI bus
  mfrc522.PCD_Init();     // Init MFRC522
  mfrc522.PCD_DumpVersionToSerial();  // Show details of PCD - MFRC522 Card Reader details
  Serial.println(F("Scan PICC to see UID, SAK, type, and data blocks..."));
}

Check for new cards¶

1
2
3

if ( ! mfrc522.PICC_IsNewCardPresent()) {
    return;
}

Select one of the cards¶

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2
3

if ( ! mfrc522.PICC_ReadCardSerial()) {
    return;
}

Dump debug info about the card¶

1	mfrc522.PICC_DumpToSerial(&(mfrc522.uid));

Sample project¶

An example project for the Arduino IDE can be downloaded: RFID-PICC.ino (download here)