我有一个RFID-RC522（MF-RC522）模块和我使用Arduino的小品节目。我已经下载了示例代码：
/*
* --------------------------------------------------------------------------------------------------------------------
* Example sketch/program showing how to read data from a PICC to serial.
* --------------------------------------------------------------------------------------------------------------------
* This is a MFRC522 library example; for further details and other examples see: https://github.com/miguelbalboa/rfid
*
* Example sketch/program showing how to read data from a PICC (that is: a RFID Tag or Card) using a MFRC522 based RFID
* Reader on the Arduino SPI interface.
*
* When the Arduino and the MFRC522 module are connected (see the pin layout below), load this sketch into Arduino IDE
* then verify/compile and upload it. To see the output: use Tools, Serial Monitor of the IDE (hit Ctrl+Shft+M). When
* you present a PICC (that is: a RFID Tag or Card) at reading distance of the MFRC522 Reader/PCD, the serial output
* will show the ID/UID, type and any data blocks it can read. Note: you may see "Timeout in communication" messages
* when removing the PICC from reading distance too early.
*
* If your reader supports it, this sketch/program will read all the PICCs presented (that is: multiple tag reading).
* So if you stack two or more PICCs on top of each other and present them to the reader, it will first output all
* details of the first and then the next PICC. Note that this may take some time as all data blocks are dumped, so
* keep the PICCs at reading distance until complete.
*
* @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>
#define RST_PIN 9 // Configurable, see typical pin layout above
#define SS_PIN 10 // Configurable, see typical pin layout above
MFRC522 mfrc522(SS_PIN, RST_PIN); // Create MFRC522 instance
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
mfrc522.PCD_DumpVersionToSerial(); // Show details of PCD - MFRC522 Card Reader details
Serial.println(F("Scan PICC to see UID, SAK, type, and data blocks..."));
}
void loop() {
// Look for new cards
if ( ! mfrc522.PICC_IsNewCardPresent()) {
return;
}
// Select one of the cards
if ( ! mfrc522.PICC_ReadCardSerial()) {
return;
}
// Dump debug info about the card; PICC_HaltA() is automatically called
mfrc522.PICC_DumpToSerial(&(mfrc522.uid));
}
当我执行它，我得到的消息：
固件版本：为0x0 =（未知）
警告：通讯故障，是MFRC522连接是否正确？
扫描PICC看到UID，SAK，类型和数据块...
我已经重新检查了连接一千时间，但它不工作，作为例子说的引脚连接，并且LED D1是在（红色）。没有人能帮助我吗？
如果有人寻找一个解决方案... 第1步：改变RST引脚5，如果你正在使用Arduino的乌诺或Arduino的巨型使用RST引脚9。其他引脚保持不变。 第2步：下载AddicoreRFID库。 步骤3：打开Arduino的IDE，并导航到草图>包括使用“添加.ZIP库...”选项库。 步骤4：重新启动Arduino的IDE（关闭并重新打开） 步骤-5：在内部的Arduino IDE导航文件>实施例> AddicoreRFID。选择“Addicore_RFID_Example”草图并上传草图 步骤-6：打开串行窗口并选择“两者NL＆CR”，并选择“9600”为波特率选项
详细的解释可以在link找到
此问题是由于不正确的布线或接触不良到RFID传感器。你需要焊接的接触才能得到结果。
此外，选择适合您的Arduino板相应的引脚。
*试试这个代码*
#include <RFID.h>
/*
* Pin layout should be as follows (on Arduino Uno):
* MOSI: Pin 11 / ICSP-4
* MISO: Pin 12 / ICSP-1
* SCK: Pin 13 / ISCP-3
* SS/SDA: Pin 10
* RST: Pin 9
*/
#include <SPI.h>
#include <RFID.h>
#define SS_PIN 10
#define RST_PIN 9
RFID rfid(SS_PIN,RST_PIN);
int self = 7;
int bat = 8;
int s = 6;
int serNum[5];
int cards[][5] = {
{42,249,70,213,64}
};
bool access = false;
void setup(){
Serial.begin(9600);
SPI.begin();
rfid.init();
pinMode(self, OUTPUT);
pinMode(bat ,OUTPUT);
pinMode(s,OUTPUT);
digitalWrite(self, LOW);
digitalWrite(bat , LOW);
}
void loop(){
if(rfid.isCard()){
if(rfid.readCardSerial()){
Serial.print(rfid.serNum[0]);
Serial.print(" ");
Serial.print(rfid.serNum[1]);
Serial.print(" ");
Serial.print(rfid.serNum[2]);
Serial.print(" ");
Serial.print(rfid.serNum[3]);
Serial.print(" ");
Serial.print(rfid.serNum[4]);
Serial.println("");
for(int x = 0; x < sizeof(cards); x++){
for(int i = 0; i < sizeof(rfid.serNum); i++ ){
if(rfid.serNum[i] != cards[x][i]) {
access = false;
break;
} else {
access = true;
}
}
if(access) break;
}
}
if(access){
Serial.println("Welcome!");
digitalWrite(bat,HIGH);
digitalWrite(self,HIGH);
delay(1000);
digitalWrite(self,LOW);
} else {
Serial.println("Not allowed!");
digitalWrite(s,HIGH);
delay(2000);
digitalWrite(s,LOW);
digitalWrite(bat,LOW);
}
}
rfid.halt();`enter code here`
}