Hi ! i have SIM900 GSM my arduino project is to receive and answer to the same number (if another phone send SMS to answer him) what command can i use ? i find this AT+CNUM but i dont know how can i make the syntax… is hard for me because my english is bad ! i need command to show me only the number of the phone so as to register the price and to mend applying the answer.
Well I don't know which one you have, but for instance this page has lots of transferable information:
Thanks for your answer but did not find what I was looking for …
i have find this tutorial is very useful http://tronixstuff.com/2014/01/08/tutorial-arduino-and-sim900-gsm-modules/
SoftwareSerial SIM900(7, 8);
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
// blurt out contents of new SMS upon receipt to the GSM shield’s serial out
// software equivalent of pressing the GSM shield “power” button
// Now we simply display any text that the GSM shield sends out on the serial monitor
incoming_char=SIM900.read(); //Get the character from the cellular serial port.
Serial.print(incoming_char); //Print the incoming character to the terminal.
?t this program he can print on display the number of the sender the date and time of the SMS receipt. I want to take the number of the sender to use it for my unswer SMS. How can i do this ? i cant find another command to show only the number and if i find it how can i use it to send it ?
Try this site:
You can use their java application to operate your GSM module, test, experiment, and learn what capabilities it has.