如何使用arduino uno和Arduino IDE运行Ai Thinker A9G全球定位模块？

Question

我找不到任何博客或解决方案来使用Arduino IDE连接和运行Arduino Uno的A9G Ai thinker /GPRS GPS模块。只找到一个视频，但它显示了使用USB到TTL转换器的A9G连接。但是我需要Arduino uno和A9G的正确连接细节。如何连接它们？(让我告诉你，我用arduino rx连接A9G rx，用arduino tx连接tx，用arduino rx连接GRnd和Vcc (5v+)，并使用SMAD口，但不起作用)哪个板和端口必须使用集成开发环境才能使用A9G？如何使用arduino代码将AT命令放入IDE中。提前谢谢你。

Answer 1

经过研究，我成功地用Arduino Uno实现了A9G，下面是代码：

#include <SoftwareSerial.h> // Library for using serial communication
SoftwareSerial SIM900(7, 8); // Pins 7, 8 are used as used as software serial pins

String incomingData;   // for storing incoming serial data
//String message = "";   // A String for storing the message
//int relay_pin = 2;    // Initialized a pin for relay module
char msg;
char call;
void setup()
{
  Serial.begin(115200); // baudrate for serial monitor
  SIM900.begin(115200); // baudrate for GSM shield
  

  Serial.println("GSM SIM900A BEGIN");
  Serial.println("Enter character for control option:");
  Serial.println("h : to disconnect a call");
  Serial.println("i : to receive a call");
  Serial.println("s : to send message");
  Serial.println("c : to make a call");  
  Serial.println("e : to redial");
  Serial.println("l : to read location");
  Serial.println();
  delay(100);

  
  /*SIM900.println("AT+GPS=1");
  delay(100);
  SIM900.println("AT+GPSRD=5");
  delay(5000);*/
  
  // set SMS mode to text mode
  SIM900.print("AT+CMGF=1\r");  
  delay(100);
  
  // set gsm module to tp show the output on serial out
  SIM900.print("AT+CNMI=2,2,0,0,0\r"); 
  delay(100);
}

void loop()
{
  
  receive_message();


if (Serial.available()>0)
   switch(Serial.read())
  {
    case 's':
      SendMessage();
      break;
    case 'c':
      MakeCall();
      break;
    case 'h':
      HangupCall();
      break;
    case 'e':
      RedialCall();
      break;
    case 'i':
      ReceiveCall();
      break;
    case 'l':
      ReadLocation();
      break;
  }
       
}

void receive_message()
{
  if (SIM900.available() > 0)
  {
    incomingData = SIM900.readString(); // Get the data from the serial port.
    Serial.print(incomingData); 
    delay(10); 
  }
}

void SendMessage()
{
  SIM900.println("AT+CMGF=1");    //Sets the GSM Module in Text Mode
  delay(1000);  // Delay of 1000 milli seconds or 1 second
  SIM900.println("AT+CMGS=\"+201126498473\"\r"); // Replace x with mobile number
  delay(1000);
  SIM900.println("sim900a sms");// The SMS text you want to send
  delay(100);
   SIM900.println((char)26);// ASCII code of CTRL+Z
  delay(1000);
}

void ReceiveMessage()
{
  SIM900.println("AT+CNMI=2,2,0,0,0"); // AT Command to recieve a live SMS
  delay(1000);
  if (SIM900.available()>0)
  {
    msg=SIM900.read();
    Serial.print(msg);
  }
}

void MakeCall()
{
  SIM900.println("ATD+201020516469;"); // ATDxxxxxxxxxx; -- watch out here for semicolon at the end, replace your number here!!
  Serial.println("Calling  "); // print response over serial port
  delay(1000);
}


void HangupCall()
{
  SIM900.println("ATH");
  Serial.println("Hangup Call");
  delay(1000);
}

void ReceiveCall()
{
  SIM900.println("ATA");
  delay(1000);
  {
    call=SIM900.read();
    Serial.print(call);
  }
}

void RedialCall()
{
  SIM900.println("ATDL");
  Serial.println("Redialing");
  delay(1000);
}
void ReadLocation(){

  SIM900.println("AT+GPS=1");
  delay(1000);
  SIM900.println("AT+GPSRD=5");
  delay(1000);
  
  }

将串行监视器波特率设置为115200，并在MakeCall函数中替换您的数字

编辑:我在使用波特率为11500的串口监视器时遇到了噪音，将其替换为9600时噪音已经消失了。

编辑:重要提示:如果天线在开阔区域并且模块连接到外部电源，gps将给出正确的读数，否则它会给你旧的读数。