quique123
Newbie level 1
I have this SIM900 module from sainsmart:
https://www.sainsmart.com/sim900-gp...-module-kit-for-arduino-high-quality-new.html
When I use it with a MEGA and the library from MarcoMartines here at github:
https://github.com/MarcoMartines/GSM-GPRS-GPS-Shield
That sketch has this method in it:
the sendsms function() works fine and sends the sms in about 1-2 minutes after powering up when loaded onto the MEGA.
I have tried sending the sms from a nano with the same library & using AT commands but it fails, meaning the sms is never received. The AT commands I used are:
After some messing around with the at commands I noticed that the SIM takes a while to register on the network and Im wondering how to fix it. Obviously the Mega/Library sketch makes the module register fast enough to have it send the sms. I posted my results here:
https://forum.arduino.cc/index.php?topic=427874.msg2957886#msg2957886
Basically if I let the module sit about 10 minutes after powering up, it registers on the network, gives me a Call Ready log and then Im able to enter those same AT commands and the sms is sent successfully. So I need to discover what it is that the github library does to make the sim register so I can send the at commands from the nano and have them work!
I came to this forum because of this thread:
https://www.edaboard.com/threads/299832/
https://www.sainsmart.com/sim900-gp...-module-kit-for-arduino-high-quality-new.html
When I use it with a MEGA and the library from MarcoMartines here at github:
https://github.com/MarcoMartines/GSM-GPRS-GPS-Shield
That sketch has this method in it:
Code:
if (gsm.begin(9600)) {
Serial.println("\nstatus=READY");
started=true;
} else {
Serial.println("\nstatus=IDLE");
}
if(started) {
//Enable this two lines if you want to send an SMS.
if (sms.SendSMS(number, "answer me"))
Serial.println("\nSMS sent OK");
}the sendsms function() works fine and sends the sms in about 1-2 minutes after powering up when loaded onto the MEGA.
I have tried sending the sms from a nano with the same library & using AT commands but it fails, meaning the sms is never received. The AT commands I used are:
Code:
sim900.begin(9600);
delay(10000);
sim900.print("\r");
delay(1000); //Wait for a second while the modem sends an "OK"
sim900.print("AT+CMGF=1\r"); //text mode
delay(1000);
sim900.print("AT+CMGS=\"+504mynumber\"\r");
delay(1000);
sim900.print("SIM900 and Arduino say Hi!\r"); //The text for the message
delay(1000);
sim900.write(0x1A); //Equivalent to sending Ctrl+ZAfter some messing around with the at commands I noticed that the SIM takes a while to register on the network and Im wondering how to fix it. Obviously the Mega/Library sketch makes the module register fast enough to have it send the sms. I posted my results here:
https://forum.arduino.cc/index.php?topic=427874.msg2957886#msg2957886
Basically if I let the module sit about 10 minutes after powering up, it registers on the network, gives me a Call Ready log and then Im able to enter those same AT commands and the sms is sent successfully. So I need to discover what it is that the github library does to make the sim register so I can send the at commands from the nano and have them work!
I came to this forum because of this thread:
https://www.edaboard.com/threads/299832/