arduino - 带有 ESP8266 的 RC522 不工作 Arduino uno

Question

我为 Arduino Uno 编写了以下代码，使用 RC522 模块和 ESP8266 模块扫描 RFID 卡以连接到我的路由器。

现在，当我扫描任何卡时，它应该读取卡号并向我的服务器的 IP 地址发送请求并获得响应。

但是成功读取RFID卡后，通过TCP与服务器的连接不起作用:

esp.println("AT+CIPSTART=\"TCP\",\"" + server + "\",80");//start a TCP connection.

所以我无法向我的服务器发送请求。

但是当我删除 RC522 代码(用于测试)时它可以正常工作!

RC522和ESP8266一起使用有什么问题？

#include <SPI.h>
#include <MFRC522.h>
#include "SoftwareSerial.h"

#include <Wire.h>
#include <LiquidCrystal_I2C.h>

//I2C pins declaration
LiquidCrystal_I2C lcd(0x3F, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE);

#define SS_PIN 9
#define RST_PIN 7
#define mainLock 2


String ssid = "MYSSID";
String password = "PASSWORD";

SoftwareSerial esp(2, 3);// RX, TX
String server = "192.168.1.102"; //Your Host
String uri = "/get_data.php?rfid_key=";

//#define LED_G 4 //define green LED pin
//#define LED_R 5 //define red LED
#define BUZZER 6 //buzzer pin

MFRC522 mfrc522(SS_PIN, RST_PIN);   // Create MFRC522 instance.

String rfidUid = "";

#define DEBUG true

void setup()
{
  //  Serial.begin(9600);   // Initiate a serial communication

  esp.begin(9600);

  Serial.begin(9600);

  SPI.begin();      // Initiate  SPI bus
  mfrc522.PCD_Init();   // Initiate MFRC522

  connectWifi();

  httpget();

  delay(1000);

  Serial.println("Put your card to the reader...");
  Serial.println();

  pinMode(mainLock, OUTPUT);

  lcd.begin(16, 2); //Defining 16 columns and 2 rows of lcd display
  lcd.backlight();//To Power ON the back light

}

void connectWifi() {

  sendData("AT+RST\r\n", 2000, DEBUG);          //This command will reset module to default
  sendData("AT+CWMODE=3\r\n", 1000, DEBUG);

  String cmd = "AT+CWJAP=\"" + ssid + "\",\"" + password + "\"";

  esp.println(cmd);

  delay(4000);

  if (esp.find("OK")) {
    Serial.println("Connected!");
  }
  else {
    Serial.println("Cannot connect to wifi ! Connecting again...");
    connectWifi();
  }


}

/////////////////////////////GET METHOD///////////////////////////////
void httpget() {
//  // Look for new cards
  if ( ! mfrc522.PICC_IsNewCardPresent())
  {
   return;
  }
  // Select one of the cards
  if ( ! mfrc522.PICC_ReadCardSerial())
  {
   return;
  }

  //Show UID on serial monitor
  Serial.print("UID tag :");
  String content = "";
  byte letter;

  rfidUid = "";
  for (byte i = 0; i < mfrc522.uid.size; i++)
  {
    Serial.print(mfrc522.uid.uidByte < 0x10 ? " 0" : " ");
    Serial.print(mfrc522.uid.uidByte, HEX);
    content.concat(String(mfrc522.uid.uidByte < 0x10 ? " 0" : " "));
   content.concat(String(mfrc522.uid.uidByte, HEX));

    rfidUid += String(mfrc522.uid.uidByte < 0x10 ? "0" : "");
   rfidUid += String(mfrc522.uid.uidByte, HEX);

  }

  Serial.println();
  content.toUpperCase();

  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print(rfidUid);

  esp.println("AT+CIPSTART=\"TCP\",\"" + server + "\",80");//start a TCP connection.

  if ( esp.find("OK")) {

    Serial.println("TCP connection ready");

  } delay(1000);

     if ( esp.find("OK")) {

    Serial.println("TCP connection ready");

    } delay(1000);

    String getRequest =
      "GET " + uri + rfidUid + " HTTP/1.0\r\n" +
      "Host: " + server + "\r\n" +
      "Accept: *" + "/" + "*\r\n" +
      "Content-Type: text/plain\r\n" +
      "\r\n";

   String sendCmd = "AT+CIPSEND=";

   esp.print(sendCmd);

    esp.println(getRequest.length());

  delay(500);

   if (esp.find(">")) {

     Serial.println("Sending..");

      esp.print(getRequest);

      if (esp.find("SEND OK")) {

        Serial.println("Packet sent");

        while (esp.available()) {

         String response = esp.readString();

         Serial.println("response.." + response);

        }
        esp.println("AT+CIPCLOSE");
     }
   }

}

void loop()
{
  httpget();


}


String sendData(String command, const int timeout, boolean debug) // Function to send the data to the esp8266
{
  String response = "";
  esp.print(command);           // Send the command to the ESP8266
  long int time = millis();
  while ( (time + timeout) > millis()) // ESP8266 will wait for some time for the data to receive
  {
    while (esp.available())     // Checking whether ESP8266 has received the data or not
    {
      char c = esp.read();      // Read the next character.
      response += c;                // Storing the response from the ESP8266
    }
  }
  if (debug)
  {
    Serial.print(response);         // Printing the response of the ESP8266 on the serial monitor.
  }
  return response;
}

论坛链接 - https://forum.arduino.cc/index.php?topic=538180.0

Answer 1

不幸的是，您没有显示工作代码(部分，TCP 连接)和不工作代码(根本没有，或者只是 TCP 连接？)之间的区别。

when i remove the Rc522 code testing then it is working !

尝试更详细地描述哪些有效，哪些无效。您还可以提供调试输出并添加一些注释。

此外，我会尝试删除更多非必要代码(如显示)以帮助缩小原因范围。这可能已经让您走上正确的轨道来自己修复它，但它也会使您的代码更容易阅读(另请参阅 How to create a Minimal, Complete, and Verifiable example 尽管我怀疑许多人是否有重现您的问题的确切部分 - 但您可能会很幸运).

但是，根据您提供的代码，这只是一个猜测:

Arduino 可能没有从 ESP8266 模块接收数据，因为您正在将 RX 引脚重新配置为输出(但您没有使用它!？):

#define mainLock 2
...
pinMode(mainLock, OUTPUT);

冲突

SoftwareSerial esp(2, 3);// RX, TX

因此，我建议仔细检查您的 pin 使用和连接(另外，提供此信息会增加您发现错误的机会)。