使用arduino用sim900发送短信

Question

 #include <Password.h> 
#include <Keypad.h> 
#include <Servo.h> 
#include "SIM900.h"
#include <SoftwareSerial.h>
#include "sms.h"

Servo myservo; 
Password password = Password( "1234" ); //password to unlock box, can be changed
SMSGSM sms;
int numdata;
boolean started=false;
char smsbuffer[160];
char n[20];

const byte ROWS = 4; 
const byte COLS = 4; 

// Define the Keymap
char keys[ROWS][COLS] = {
{'1','2','3','A'},
{'4','5','6','B'},
{'7','8','9','C'},
{'*','0','#','D'}
};
// Connect keypad ROW0, ROW1, ROW2 and ROW3 to these Arduino pins.
byte rowPins[ROWS] = { 9, 8, 7, 6 };// Connect keypad COL0, COL1 and COL2 to these Arduino pins.
byte colPins[COLS] = { 5, 4, 3, 2 };
int x=0;


// Create the Keypad
Keypad keypad = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );

void setup()     //if i add sms(); function it workssss
{ 

   Serial.begin(9600); //Start a Serial COM

   Serial.println(F("ARDUINO SECURITY SYSTEM V1.0"));

   Serial.print(F("Checking GSM COM..."));

  if (gsm.begin(9600)) //Start the GSM COM
  {
    (sms.SendSMS("+XXXXX","Your Home Security system is powered up"));
    Serial.println(F("Good To GO!!"));
  }
  else
  {
    Serial.println(F("Could not connect to GSM modem"));
  }

  Serial.write(254);
  Serial.write(0x01);
  delay(200); 
  pinMode(11, OUTPUT);  //green light
  pinMode(12, OUTPUT);  //red light
  myservo.attach(13); //servo on digital pin 9 //servo
  keypad.addEventListener(keypadEvent);//add an event listener for this keypad

  }

void loop(){
  keypad.getKey();
  myservo.write(0);
  }
  //take care of some special events
  void keypadEvent(KeypadEvent eKey){
  switch (keypad.getState()){
  case PRESSED:

  Serial.print("Enter : ");
  Serial.println(eKey);
  delay(10);

  Serial.write(254);

  switch (eKey){
    case 'A': checkPassword(); delay(1); break;
    case 'C': checkPassword(); delay(1); break;
    case 'D': checkPassword(); delay(1); break;
    case 'B': password.reset(); delay(1); break;
    case '*': checkPassword(); break;
    case '#': password.reset(); break;

    default: password.append(eKey); delay(1);
  }
 }
}
void checkPassword(){

if (password.evaluate()){  //if password is right open box

    Serial.println("Accepted");
    Serial.write(254);delay(50);
    //Add code to run if it works
    myservo.write(5); //160deg

        digitalWrite(11, HIGH);//turn on
    delay(2000); //wait 5 seconds
    digitalWrite(11, LOW);// turn off   
}
else
{

    Serial.println("Denied"); //if passwords wrong keep box locked
    Serial.write(254);delay(10);
    x++;

    if(x==3)
    //add code to run if it did not work
   {
    myservo.write(0);
    digitalWrite(12, HIGH); 
    delay(500); 
    digitalWrite(12, LOW);  
  if (gsm.begin(9600)) 
  {
    (sms.SendSMS("+XXXXX","Your Home Security system is being bridged"));

    Serial.println("USER WARNED");
   }

}
}
}
;
}

图中相同的代码在我放置线条时似乎不起作用

if (gsm.begin(9600)) //Start the GSM COM
  {
    (sms.SendSMS("+8613668914901","Your Home Security system is being bridged"));

但是这行代码在 void setup 函数中工作得很好。

我该如何解决这个问题？在 void 设置中，草图工作正常，但是当我也将代码放入函数 CheckPassword 中时，它不发送短信。

我还尝试创建一个函数让我们说 void SMS 并在 checkPassword 函数中调用它，但它没有解决问题，顺便说一句，在 void 设置中调用相同的函数时工作正常。

Answer 1

您应该只在 setup 函数中初始化 gsm 一次。

在您的代码中，您尝试在 checkPassword 方法中再次初始化它，这显然是行不通的。

因此，您应该从 checkPassword 函数中删除行 gsm.begin(9600)。

更新 1：

在你的方案中，你为键盘保留了 pins 9, 8, 7, 6, 5, 4, 3, 2 .然而，与此同时，您为 GSM 模块保留引脚 2、3（参见 GSM.cpp）：

 #define _GSM_TXPIN_ 2
 #define _GSM_RXPIN_ 3

将相同的引脚用于多种用途通常会导致（如果未正确完成）未定义的行为，这在最好的情况下意味着您的草图没有按照预期的方式进行，而在最坏的情况下它可能会损坏您的组件。

您已经在 Serial 库中使用引脚 0, 1，但是根据您的代码，引脚 如果您想将现有引脚重新定位到您的组件，10、11、13 应该仍然可用。

另请注意 GSM 库中的以下 warnings：

[3] My shield doesn't work. Why?

Check this steps and then ask for support on the issues' page on google code.

1) SIM900 and SIM908 require about 1 A during the hardest tasks. You should have an external power source that can provide about 1 A at 8-12 V

2) If the SIM90X blinks (1 Hz) for some seconds and then turn off, probably it's a communication's problem. Check the switch/jumpers for Serial communication.

3) Arduino Uno has 2 KB of RAM. Library takes about 80% (we are working to reduce it), if you use more than 20% left, Arduino can restart or print on serial strange strings.

4) Check the jumper of communication, power source (battery or externel) and charge.

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