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[on:]

Code:

/*
  GSM Send Sketch for Arduino
  
  Initializes GSM Module and sends an SMS to recipient
  
  The circuit:
  *Arduino pin 0 (RX) - GSM Module (TX)
  *Arduino pin 1 (TX) - GSM Module (RX)
  
 
char Rx_data[50];                    
unsigned char Rx_index = 0;        // what does unsigned char Rx_index = 0 means? as you can see the variable "Rx_index" didnt use.
int i = 0;
char msg[160];                          
int sig;                                    // int sig?    the variable "sig" did not used in the program, but if i remove it, its error compiling.

void setup() {
  Serial.begin(38400);                
  
  initGSM();                                  

  send_msg("09166120858", "Hello");  

void loop() {
  //none
}

void send_msg(char *number, char *msg)     // oh my god, i dont understand does codes  . plss god give me the answer
{
  char at_cmgs_cmd[30] = {'\0'};           // what '\0' means?
  char msg1[160] = {'\0'};
  char ctl_z = 0x1A;                            // what is 0x1A         

  sprintf(msg1, "%s%c", msg, ctl_z);
  sprintf(at_cmgs_cmd, "AT+CMGS=\"%s\"\r\n",number);
  
  sendGSM(at_cmgs_cmd);             
  delay(100);
  delay(100);
  delay(100);
  sendGSM(msg1);
  delay(100);
}

void sendGSM(char *string){
  Serial.write(string);
  delay(90);
}

void clearString(char *strArray) {
  int j;
  for (j = 100; j > 0; j--)
    strArray[j] = 0x00;
}

void send_cmd(char *at_cmd, char clr){
  char *stat = '\0';
  while(!stat){
    sendGSM(at_cmd);
    delay(90);
    readSerialString(Rx_data);
    
    stat = strstr(Rx_data, "OK");
  }
  if (clr){
    clearString(Rx_data);
    delay(200);
    stat = '\0';
  }
}

void initGSM(){
  
  send_cmd("AT\r\n",1);
//  send_cmd("ATE0\r\n",1);              // Turn off automatic echo of the GSM Module // what is automatic echo?

  send_cmd("AT+CMGF=1\r\n",1); // Set message format to text mode
  //Sucess
  
  Serial.println("Success");

  delay(1000);
  delay(1000);
  delay(1000);
}

void readSerialString (char *strArray) {
  
  if(!Serial.available()) {
    return;
  }
  
  while(Serial.available()) {
    strArray[i] = Serial.read();
    i++;
  }
}

[Reply #1 on:]

what the **** do this mean?...

Nothing. The entire code is commented out and the file may as well be empty as far as the compiler is concerned.

Perhaps you meant to close the comment at the end of the header?

[Reply #2 on:]

http://www.cplusplus.com/doc/tutorial/functions/

This will teach you about function calls.


http://arduino.cc/en/Reference/HomePage

Under "Data Types" read everything, particularly 'array'.

Under "Communication" read "Serial".

[Reply #3 on:]

http://www.cplusplus.com/doc/tutorial/functions/

This will teach you about function calls.


http://arduino.cc/en/Reference/HomePage

Under "Data Types" read everything, particularly 'array'.

Under "Communication" read "Serial".

oooowwww, brilliant!. your link answered some of my questions. you are genius. this codes only sends a message to my number, then what about if i send a message to the gsm shield making the led13 turns on? hopefully you can add a function that can do that.. i hope you know that..

[Reply #4 on:]

the code and questions updated.... since other questions are answered by the links.

pls help for the remaining question .  may God helps me too. still praying.