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所以我想将我的 SIM800L GSM 模块连接到我的 NodeMCU。我购买了一个 LM2596 DC-DC 稳压器，将 SIM800L 的输出电压转换为 ~4V。稳压器的输入电压为 9V/1A。

一切都已连接：从 GSM 到 D5 (GPIO14) 的 RX，从 TX 到 D6 (GPIO12) 和 RST 到 D7 (GPIO13)。GPIO 是故意选择的，因为我在网上阅读过，NodeMCU 上的 RX/TX 引脚在内部使用。我之前尝试过匹配 RX/TX 引脚，但结果相同（这就是为什么我可以肯定，它必须是我的代码有缺陷）。GSM 模块中还插入了一张 SIM 卡（带有 PIN 码）。

我在 Arduino IDE 上进行编码，我正在使用 GSMSim 和 SoftwareSerial 库来连接到 GSM 模块。我已经尝试使用 GSMSim 中的示例草图与 GSM 模块进行通信，但我的串行监视器上没有得到任何答案。

我还尝试手动向 GSM 模块发送命令。

#include <GSMSim.h>
#include <SoftwareSerial.h>

// You can use any Serial interface. I recommended HardwareSerial. Please use the library with highiest baudrate.
// In examples, i used HardwareSerial. You can change it anymore.

#define RX 14
#define TX 12
#define RESET 13

SoftwareSerial serial(RX, TX);
GSMSim gsmModule(serial, RESET);

void setup() {
  serial.begin(115200); // If you dont change module baudrate, it comes with auto baudrate.
  while(!serial) ;
  Serial.begin(115200); // Serial for debug...
  while(!Serial) ;

  Serial.println("");
  Serial.println("serial begin");
  
    // Init module...
    gsmModule.init(); // use for reseting module. Use it if you dont have any valid reason.
  delay(100);

  gsmModule.sendATCommand("AT+GMR");
  if(serial.available()) Serial.println(serial.readString());
  Serial.println("Sent AT");

}

输出：

serial.begin
Sent AT

修改后的 GSMSim_HTTP 草图的另一个示例：

#include <GSMSim.h>
#include <SoftwareSerial.h>

// You can use any Serial interface. I recommended HardwareSerial. Please use the library with highiest baudrate.
// In examples, i used HardwareSerial. You can change it anymore.

#define RX 14
#define TX 12
#define RESET 13

SoftwareSerial serial(RX, TX);
GSMSim http(serial, RESET);
static volatile int num = 0;

void setup() {
  serial.begin(115200); // If you dont change module baudrate, it comes with auto baudrate.

  while(!serial) {
    ; // wait for module for connect.
  }

  Serial.begin(115200); // Serial for debug...

  // Init module...
  http.init(); // use for init module. Use it if you dont have any valid reason.

  Serial.print("Set Phone Function... ");
  Serial.println(http.setPhoneFunc(1));
  //delay(1000);

  Serial.print("is Module Registered to Network?... ");
  Serial.println(http.isRegistered());
  //delay(1000);

  Serial.print("Signal Quality... ");
  Serial.println(http.signalQuality());
  //delay(1000);

  Serial.print("Operator Name... ");
  Serial.println(http.operatorNameFromSim());
  //delay(1000);


  //Serial.print("GPRS Init... ");
  //Serial.println(http.gprsInit("internet")); // Its optional. You can set apn, user and password with this method. Default APN: "internet" Default USER: "" Default PWD: ""
  //delay(1000);


  Serial.print("Connect GPRS... ");
  Serial.println(http.connect());
  //delay(1000);

  Serial.print("Get IP Address... ");
  Serial.println(http.getIP());
  delay(1000);
  
 
  Serial.print("Get... ");
  Serial.println(http.get("sera.erdemarslan.com/test.php"));
  delay(1000);

  Serial.print("Get with SSL and read returned data... ");
  Serial.println(http.getWithSSL("erdemarslan.com/test.php", true));
  delay(1000);

  Serial.print("Post... ");
  Serial.println(http.post("sera.erdemarslan.com/test.php", "name=Erdem&surname=Arslan", "application/x-www-form-urlencoded"));
  delay(1000);

  Serial.print("Post with SSL and read returned data... ");
  Serial.println(http.post("erdemarslan.com/test.php", "name=Erdem&surname=Arslan", "application/x-www-form-urlencoded", true));
  delay(1000);

  Serial.print("Close GPRS... ");
  Serial.println(http.closeConn());
  //delay(1000);

  // For other methods please look at readme.txt file.

}

void loop() {
  
  // Use your Serial interface...
  if(serial.available()) {
      String buffer = "";
      buffer = Serial1.readString();
      num = num + 1;
      Serial.print(num);
      Serial.print(". ");
      Serial.println(buffer);
  }
  
  // put your main code here, to run repeatedly:
}

输出：

serial.begin
Set Phone Function... 0
is Module Registered to Network?... 0
Signal Quality... 99
Operator Name... NOT CONNECTED
Connect GPRS... 0
Get IP Address... 
Get module date time... ERROR:NOT_GET_DATETIME
Set timezone and time server... 0
Sync date time from server... AT_COMMAND_ERROR
Get module date time after sycn... ERROR:NOT_GET_DATETIME
Close GPRS... 0

我希望这是显而易见的，因为我根本不熟悉 AT 命令。

谢谢！

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