RFID  frequency identification is a non-contact object recognition technology, it can automaticlly recognize target and get relevant data through rf signal, so there are so many interactive projects which need to use RFID to achieve object recognition. Generally speaking, one basic kit of RFID general system mainly consists of three parts :
 
Tag : composed by coupling components and chip, every tag have only electronic coding, adhere to the target object identifier
 
Reader : equipment used to read (sometimes can write) tag information, can be designed for handheld or stationary;
 
Antenna : transmit rf signal between the tag and reader.
 
At present there are so many RFID module, and there are difference from the interface of Arduino, we design these two version of RFID module which connect with Arduino through serial port, and both of these two version have exact same function and connection mode, but the antenna is different.

1、Supported cards :

ISO 14443 TYPE A : MIFARE ® ,Mifare ® Classic1K,Mifare ® Classic 4K

2、Special Features :

1、Complete Read/Write module except antenna
   
2、Auto checks for presence of tags and output interrupt information
   
3、Contactless operating frequency ：13.56 MHz
   
4、Supports ISO14443A
   
5、UART、IIC、SPI  Interface, baud rate19200bps
   
6、Fast data transfer, Contactless communication up to 106KHZ
   
7、Secure Encrypted contactless communication
   
8、Ideal for emoney, secure access and fast data collection applications
   
9、Typical Operating Distance : 0-- 60 mm
   
10、Operating Voltage DC：3.0-5.5V（fully compatible with 3.3v and 5v）
   
11、Watchdog timer
   
12、1 LED indicator, 2 I/O pins for external use
   
13、512 bytes eeprom
   
14、Unique serial number on each device
   
15、Size : 40mm × 25mm × 6mm
   
16、Weight : 12g

17、Work Temperature : -20 ℃ － + 70 ℃

3、Interface  Options :

1、UART  Interface

2、I2C  Interface

3、SPI  Interface

Please choose the interface you want to order and the default interface mode is UART Interface.

One version have separate reader and antenna, separately on two boards. Because this antenna is more bigger, therefore the detection distance can be as far as 10cm :

 

The other version have integrate reader and antenna, integrately on one boards, and the detection distance can be as far as 6cm :

 

The working  principle of RFID is actually not complex, once the tag into the working area of card reader, card reader can read the data of tag by magnetic field generated by the antenna.
 
According to the specific use of different scene, we can use different types of tags, different types of tags have different range :

 

In the process of actual using, we can firstly use the reader to read the ID of different tags.

After connection, we use the serial debugging tool to open Serial Dongle corresponding Serial port, the baud rate is set to 19200, then send reading card order as HEX format : AA BB 02 20 22 (totally 5 bytes) :
 But  If there are cards within the working area of RFID module, RFID module red LED will be lighted, at the same time return order as HEX format through serial port : AA BB 06 20 5E 97 25 C7 0D (9 byte), and then  5E 97 25 C7 is the tag ID. Different tags returns different ID value, and we just distinguish different objests through different ID value.
 
When geting the corresponding tags ID value, then we can recognize on Arduino, about the hardware connection, we still use the COM interface of Arduino sensor shield to connect RFID mdule with Arduino.

 

The corresponding Arduino code shown as below, the test tag ID is 5E 97 25 C7, when Arduino detected the corresponding tag, will light the LED on 13 digital I/O port of Arduino, and last for 1 second :

Test Code Start :

int val = 0;
int ledPin = 13;
int status = 0;
unsigned char searchCMD[] = {0xAA, 0xBB,0x02, 0x20, 0x22};
unsigned char searchRES[4];

void setup()
{
  Serial.begin(19200);
  pinMode(13, OUTPUT);
}

int searchCard()
{
  Serial.write(searchCMD, 5);
  delay(100);
  status = 0;
  while(true) {
    if (Serial.available() > 0) {
      val = Serial.read();
     
      switch (status) {
        case 0:  // parse 0xAA
          if (val == 0xAA) status = 1;
          break;
        case 1: // parse 0xBB
          if (val == 0xBB) status = 2;
          else return -1;
          break;
        case 2:
          if (val == 0x06) status = 3;
          else return -1;
          break;
        case 3:
          if (val == 0x20) status = 4;
          else return -1;
          break;
        case 4:
        case 5:
        case 6:
        case 7:
          searchRES[status - 4] = val;
          status ++;
          break;
        case 8:
          return 0; // read successfully
          break;
        default:
          return -1;
          break;
      }
     
    }
  }
}

void loop()
{
  if (searchCard() != -1) {
    if (searchRES[0] == 0x5E && searchRES[1] == 0x97 && searchRES[2] == 0x25 && searchRES[3] == 0xC7) {
      digitalWrite(13, HIGH);
      delay(1000);
      digitalWrite(13, LOW);
      delay(1000);
    }
  }
}
 

13.56MHz RFID Module Kits -10cm List：

1、13.56MHz UART / IIC / SPI RFID Module ×1

2、External antenna ×1

3、Non-Welded Commom Connector Module  ×1
4、13.56MHz Mifare RFID Card ×2
5、13.56MHz RFID Key IC Tag - B ×2
6、13.56MHz RFID Key IC Tag - A   ×2

7、Arduino I2C/COM Cable 30cm  ×1



Document Download：

Click to download the UART datasheet


Click to download the SPI datasheet


Click to download the IIC datasheet


Click here to download the SDK

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