I've been searching about an RFID I got from eBay, but there is not much information.
I have this code working (edited for length and Chinese to get under 9500 characters)
/*
#include <SPI.h>
#define uchar unsigned char
#define uint unsigned int
#define MAX_LEN 16
//set the pin
const int chipSelectPin = 53;
const int NRSTPD = 5;
//MF522
#define PCD_IDLE 0x00
#define PCD_AUTHENT 0x0E
#define PCD_RECEIVE 0x08
#define PCD_TRANSMIT 0x04
#define PCD_TRANSCEIVE 0x0C
#define PCD_RESETPHASE 0x0F
#define PCD_CALCCRC 0x03
//Mifare_One
#define PICC_REQIDL 0x26
#define PICC_REQALL 0x52
#define PICC_ANTICOLL 0x93
#define PICC_SElECTTAG 0x93
#define PICC_AUTHENT1A 0x60
#define PICC_AUTHENT1B 0x61
#define PICC_READ 0x30
#define PICC_WRITE 0xA0
#define PICC_DECREMENT 0xC0
#define PICC_INCREMENT 0xC1
#define PICC_RESTORE 0xC2
#define PICC_TRANSFER 0xB0
#define PICC_HALT 0x50
#define MI_OK 0
#define MI_NOTAGERR 1
#define MI_ERR 2
//Page 0:Command and Status
#define Reserved00 0x00
#define CommandReg 0x01
#define CommIEnReg 0x02
#define DivlEnReg 0x03
#define CommIrqReg 0x04
#define DivIrqReg 0x05
#define ErrorReg 0x06
#define Status1Reg 0x07
#define Status2Reg 0x08
#define FIFODataReg 0x09
#define FIFOLevelReg 0x0A
#define WaterLevelReg 0x0B
#define ControlReg 0x0C
#define BitFramingReg 0x0D
#define CollReg 0x0E
#define Reserved01 0x0F
//Page 1:Command
#define Reserved10 0x10
#define ModeReg 0x11
#define TxModeReg 0x12
#define RxModeReg 0x13
#define TxControlReg 0x14
#define TxAutoReg 0x15
#define TxSelReg 0x16
#define RxSelReg 0x17
#define RxThresholdReg 0x18
#define DemodReg 0x19
#define Reserved11 0x1A
#define Reserved12 0x1B
#define MifareReg 0x1C
#define Reserved13 0x1D
#define Reserved14 0x1E
#define SerialSpeedReg 0x1F
//Page 2:CFG
#define Reserved20 0x20
#define CRCResultRegM 0x21
#define CRCResultRegL 0x22
#define Reserved21 0x23
#define ModWidthReg 0x24
#define Reserved22 0x25
#define RFCfgReg 0x26
#define GsNReg 0x27
#define CWGsPReg 0x28
#define ModGsPReg 0x29
#define TModeReg 0x2A
#define TPrescalerReg 0x2B
#define TReloadRegH 0x2C
#define TReloadRegL 0x2D
#define TCounterValueRegH 0x2E
#define TCounterValueRegL 0x2F
//Page 3:TestRegister
#define Reserved30 0x30
#define TestSel1Reg 0x31
#define TestSel2Reg 0x32
#define TestPinEnReg 0x33
#define TestPinValueReg 0x34
#define TestBusReg 0x35
#define AutoTestReg 0x36
#define VersionReg 0x37
#define AnalogTestReg 0x38
#define TestDAC1Reg 0x39
#define TestDAC2Reg 0x3A
#define TestADCReg 0x3B
#define Reserved31 0x3C
#define Reserved32 0x3D
#define Reserved33 0x3E
#define Reserved34 0x3F
uchar serNum[5];
uchar writeData[16]={0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 100};
uchar moneyConsume = 18 ;
uchar moneyAdd = 10 ;
uchar sectorKeyA[16][16] = {{0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF},
{0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF},//when you try it again, please change it into your new password
{0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF},
{0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF},
};
uchar sectorNewKeyA[16][16] = {{0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF},
{0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xff,0x07,0x80,0x69, 0x19,0x84,0x07,0x15,0x76,0x14},
{0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xff,0x07,0x80,0x69, 0x19,0x33,0x07,0x15,0x34,0x14},
{0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xff,0x07,0x80,0x69, 0x19,0x33,0x07,0x15,0x34,0x14},
};
void setup() {
Serial.begin(9600); // RFID reader SOUT pin connected to Serial RX pin at 2400bps
// start the SPI library:
SPI.begin();
pinMode(chipSelectPin,OUTPUT); // Set digital pin 10 as OUTPUT to connect it to the RFID /ENABLE pin
digitalWrite(chipSelectPin, LOW); // Activate the RFID reader
pinMode(NRSTPD,OUTPUT); // Set digital pin 10 , Not Reset and Power-down
digitalWrite(NRSTPD, HIGH);
MFRC522_Init();
}
void loop()
{
uchar i,tmp;
uchar status;
uchar str[MAX_LEN];
uchar RC_size;
uchar blockAddr;
status = MFRC522_Request(PICC_REQIDL, str);
if (status == MI_OK)
{
Serial.println("Find out a card ");
Serial.print(str[0],BIN);
Serial.print(" , ");
Serial.print(str[1],BIN);
Serial.println(" ");
}
status = MFRC522_Anticoll(str);
memcpy(serNum, str, 5);
if (status == MI_OK)
{
Serial.println("The card's number is : ");
Serial.print(serNum[0],BIN);
Serial.print(" , ");
Serial.print(serNum[1],BIN);
Serial.print(" , ");
Serial.print(serNum[2],BIN);
Serial.print(" , ");
Serial.print(serNum[3],BIN);
Serial.print(" , ");
Serial.print(serNum[4],BIN);
Serial.println(" ");
}
RC_size = MFRC522_SelectTag(serNum);
if (RC_size != 0)
{
Serial.print("The size of the card is : ");
Serial.print(RC_size,DEC);
Serial.println(" K ");
}
blockAddr = 11;
status = MFRC522_Auth(PICC_AUTHENT1A, blockAddr, sectorKeyA[blockAddr/4], serNum); //??
if (status == MI_OK)
{
status = MFRC522_Write(blockAddr, sectorNewKeyA[blockAddr/4]);
Serial.print("set the new card password, and can modify the data of the Sector ");
Serial.print(blockAddr/4,DEC);
Serial.println(" : ");
for (i=0; i<6; i++)
{
Serial.print(sectorNewKeyA[blockAddr/4][i],HEX);
Serial.print(" , ");
}
Serial.println(" ");
blockAddr = blockAddr - 3 ;
status = MFRC522_Write(blockAddr, writeData);
if(status == MI_OK)
{
Serial.println("The card has $100 !");
}
}
blockAddr = 11;
status = MFRC522_Auth(PICC_AUTHENT1A, blockAddr, sectorNewKeyA[blockAddr/4], serNum); //??
if (status == MI_OK)
{
blockAddr = blockAddr - 3 ;
status = MFRC522_Read(blockAddr, str);
if (status == MI_OK)
{
Serial.println("Read from the card ,the data is : ");
for (i=0; i<16; i++)
{
Serial.print(str[i],DEC);
Serial.print(" , ");
}
Serial.println(" ");
}
}
blockAddr = 11; //???7
status = MFRC522_Auth(PICC_AUTHENT1A, blockAddr, sectorNewKeyA[blockAddr/4], serNum); //??
if (status == MI_OK)
{
blockAddr = blockAddr - 3 ;
status = MFRC522_Read(blockAddr, str);
if (status == MI_OK)
{
if( str[15] < moneyConsume )
{
}
However I can't see how the pins are selected?