Arduino GSM SIM900 不接收消息答案

【问题标题】：Arduino GSM SIM900 does not receiving messagesArduino GSM SIM900 不接收消息
【发布时间】：2015-12-25 11:08:15
【问题描述】：

以下 URL 将出现在我的 GSM 模块中，它包含在 SIM900 模块的数据表中。

http://www.pennybuying.com/gsm-gprs-module-sim900-development-board-lbs-mms-support-arduino-uno-ttl-rs232.html

我只在 GSM 模块和 Arduino mega board 之间连接了 RX、TX、GND 和 PWR 引脚。可以正常发送短信，但无法接收短信。

这是发送短信的 Arduino 代码 - (参考 - http://tronixstuff.com/2014/01/08/tutorial-arduino-and-sim900-gsm-modules/)

#include <SoftwareSerial.h>
SoftwareSerial SIM900(15,14);

char incoming_char=0;

void setup()
{
  Serial.begin(19200); // for serial monitor
  SIM900.begin(19200); // for GSM shield
  SIM900power();  // turn on shield
  delay(20000);  // give time to log on to network.

  SIM900.print("AT+CMGF=1\r");  // set SMS mode to text
  delay(100);
  SIM900.print("AT+CNMI=2,2,0,0,0\r"); 
  // blurt out contents of new SMS upon receipt to the GSM shield's serial out
  delay(100);
}

void SIM900power()
// software equivalent of pressing the GSM shield "power" button
{
  digitalWrite(9, HIGH);
  delay(1000);
  digitalWrite(9, LOW);
  delay(7000);
}

void loop()
{
  // Now we simply display any text that the GSM shield sends out on the serial monitor
  Serial.println("loop");
  if(SIM900.available() > 0)
  {
     Serial.print("waiting");
    incoming_char=SIM900.read(); //Get the character from the cellular serial port.
    Serial.print(incoming_char); //Print the incoming character to the terminal.
    while(1){};
  }

}

【问题讨论】：

标签： arduino sms gsm sim900

【解决方案1】：

尝试在您的setup() 中添加SIM900.print("AT+CMGD=1,4\r");。我遇到了类似的问题，原因是用于消息的 sim 卡内存已满。

如果 sim 内存中没有空间，您将不会收到任何消息或通知！

所以你的 setuo 循环看起来像这样

void setup()
{
    Serial.begin(19200); // for serial monitor
    SIM900.begin(19200); // for GSM shield
    SIM900power();  // turn on shield
    delay(20000);  // give time to log on to network.

    SIM900.print("AT+CMGF=1\r");  // set SMS mode to text
    delay(100);
    SIM900.print("AT+CMGD=1,4\r");  // Deletes all SMS saved in SIM memory
    delay(100);
    SIM900.print("AT+CNMI=2,2,0,0,0\r"); 
    // blurt out contents of new SMS upon receipt to the GSM shield's serial out
     delay(100);
}

【讨论】：