Arduino sending sms in GSM sim900 error -


i have arduino mega 2560 , sim900 gsm module. interfaced them , written code. working, can send 1 sms @ time in while loop. means when write while loop execute sendsms() 5 times using while loop. 1 sms sent.. , stops...

the code below:

#include <softwareserial.h> #include <string.h> softwareserial myserial(52, 53);  void setup() {      myserial.begin(19200);      // gprs baud rate         serial.begin(19200);    // gprs baud rate       delay(500);  }  int x = 0;  loop() {      while (x<5)     {      sendtextmessage();        x++;      }     }   void sendtextmessage() {  myserial.print("at+cmgf=1\r");  delay(100);  myserial.println("at + cmgs = \"+94776511996\"");  delay(100);  myserial.println("hey wow");  delay(100);  myserial.println((char)26);  delay(100);  myserial.println(); }

you can't dump @ commands @ sim900 100ms delay, , expect work. sim900 responds @ commands (typically "ok"), , should wait response before issuing next command. can getaway ignoring these responses if provide enough delay between @ commands make sure every command sent after sim900 had enough time respond previous one. make quick verification of this, add delay(10000) - 10 seconds delay - @ end of sendtextmessage() function. (probably) give sim900 enough time complete sms transmission before moving on next one.


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