此次修改的UID是在扇區0的特定位置，一般的卡，在這個區域是鎖死無法修改的，所以如果要拷貝此區域，必須要購買特殊的RFID卡才可以複製，我本次的實驗，使用的是我以前住在外面大樓的拷貝RFID，而外面鎖店用的卡就是扇區0無鎖的卡，也因此店家才可以拷貝UID
參考資料
本次應用的函式庫網址如下
請將網址資料打包放至如下資料夾
"C:\Users\___XXXX___\Documents\Arduino\libraries"
接線方式
今天採用的是Arduino NANO + RC522 RFID模組
RC522式透過SPI與Arduino溝通的，接線方式如下
| PCD | Arduino | Teensy | |||||||
|---|---|---|---|---|---|---|---|---|---|
| MFRC522 | Uno / 101 | Mega | Nano v3 | Leonardo / Micro | Pro Micro | 2.0 | ++ 2.0 | 3.1 | |
| Signal | Pin | Pin | Pin | Pin | Pin | Pin | Pin | Pin | Pin |
| RST/Reset | RST | 9 | 5 | D9 | RESET / ICSP-5 | RST | 7 | 4 | 9 |
| SPI SS | SDA | 10 | 53 | D10 | 10 | 10 | 0 | 20 | 10 |
| SPI MOSI | MOSI | 11 / ICSP-4 | 51 | D11 | ICSP-4 | 16 | 2 | 22 | 11 |
| SPI MISO | MISO | 12 / ICSP-1 | 50 | D12 | ICSP-1 | 14 | 3 | 23 | 12 |
| SPI SCK | SCK | 13 / ICSP-3 | 52 | D13 | ICSP-3 | 15 | 1 | 21 | 13 |
測試程式
本次是用函式庫中的ChangeUID範例，讀取RFID Card中的資料
* --------------------------------------------------------------------------------------------------------------------
* Example to change UID of changeable MIFARE card.
* --------------------------------------------------------------------------------------------------------------------
* This is a MFRC522 library example; for further details and other examples see: https://github.com/miguelbalboa/rfid
*
* This sample shows how to set the UID on a UID changeable MIFARE card.
* NOTE: for more informations read the README.rst
*
* @author Tom Clement
* @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
*/
#include <SPI.h>
#include <MFRC522.h>
#include <MFRC522Hack.h>
constexpr uint8_t RST_PIN = 9; // Configurable, see typical pin layout above
constexpr uint8_t SS_PIN = 10; // Configurable, see typical pin layout above
MFRC522 mfrc522(SS_PIN, RST_PIN); // Create MFRC522 instance.
MFRC522Hack mfrc522Hack(&mfrc522); // Create MFRC522Hack instance.
/* Set your new UID here! */
byte newUid[] = {0xDE, 0xAD, 0xBE, 0xEF};
MFRC522::MIFARE_Key key;
void setup() {
Serial.begin(9600); // 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 card
Serial.println(F("Warning: this example overwrites the UID of your UID changeable card, use with care!"));
// Prepare key - all keys are set to FFFFFFFFFFFFh at chip delivery from the factory.
for (byte i = 0; i < 6; i++) {
key.keyByte[i] = 0xFF;
}
}
// Setting the UID can be as simple as this:
//void loop() {
// byte newUid[] = NEW_UID;
// if ( mfrc522.MIFARE_SetUid(newUid, (byte)4, true) ) {
// Serial.println("Wrote new UID to card.");
// }
// delay(1000);
//}
// But of course this is a more proper approach
void loop() {
// Look for new cards, and select one if present
if ( ! mfrc522.PICC_IsNewCardPresent() || ! mfrc522.PICC_ReadCardSerial() ) {
delay(50);
return;
}
// Now a card is selected. The UID and SAK is in mfrc522.uid.
// Dump UID
Serial.print(F("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();
// Dump PICC type
// MFRC522::PICC_Type piccType = mfrc522.PICC_GetType(mfrc522.uid.sak);
// Serial.print(F("PICC type: "));
// Serial.print(mfrc522.PICC_GetTypeName(piccType));
// Serial.print(F(" (SAK "));
// Serial.print(mfrc522.uid.sak);
// Serial.print(")\r\n");
// if ( piccType != MFRC522::PICC_TYPE_MIFARE_MINI
// && piccType != MFRC522::PICC_TYPE_MIFARE_1K
// && piccType != MFRC522::PICC_TYPE_MIFARE_4K) {
// Serial.println(F("This sample only works with MIFARE Classic cards."));
// return;
// }
// Set new UID
if ( mfrc522Hack.MIFARE_SetUid(newUid, (byte)4, true) ) {
Serial.println(F("Wrote new UID to card."));
}
// Halt PICC and re-select it so DumpToSerial doesn't get confused
mfrc522.PICC_HaltA();
if ( ! mfrc522.PICC_IsNewCardPresent() || ! mfrc522.PICC_ReadCardSerial() ) {
return;
}
// Dump the new memory contents
Serial.println(F("New UID and contents:"));
mfrc522.PICC_DumpToSerial(&(mfrc522.uid));
delay(2000);
}
實際測試影片
實際回傳的畫面
首先會讀取舊的UID，接著寫入新的UID，如果無法寫入，會顯示錯誤
未來可行的應用
- 拷貝門禁卡
- 製作不同功能不同UID的RFID卡
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