Quectel m10 gsm shield with arduino uno not sending sms

Hi there,

I was hoping someone could point me in the right direction. I used the example code SendSMS but I only got in the serial monitor SMS message sender... then I read about the debug so inserted GSM gsmAccess(true); but then I only get in the serial monitor:

SMK%13%%10% 13%%10%+CGREG: 0,2%13%%10%%13%%10%OK%13%%10% AT+CGREG?%13% 94 125>AT+CGREG?%13%%13%%10%+CGREG: 0,2%13%%10%%13%%10%OK%13%%10% 13%%10%+CGREG: 0,2%13%%10%%13%%10%OK%13%%10% AT+CGREG?%13% 94 125>AT+CGREG?%13%%13%%10%+CGREG: 0,2%13%%10%%13%%10%OK%13%%10% SMS Messages Sender AT%13% 0 9>AT%13%%13%%10%OK%13%%10% AT+CGREG?%13% 9 40>AT+CGREG?%13%%13%%10%+CGREG: 0,2%13%%10%%13%%10%OK%13%%10% AT+CGREG?%13% 40 71>AT+CGREG?%13%%13%%10%+CGREG: 0,2%13%%10%%13%%10%OK%13%%10% AT+CGREG?%13% 71 102>AT+CGREG?%13%%13%%10%+CGREG: 0,2%13%%10%%13%%10%OK%13%%10% AT+CGREG?%13% 102 5>AT+CGREG?%13%%13%%10%+CGREG: 0,2%13%%10%%13%%10%OK%13%%10% AT+CGREG?%13% 5 36>AT+CGREG?%13%%13%%10%+CGREG: 0,2%13%%10%%13%%10%OK%13%%10% AT+CGREG?%13% 36 67>AT+CGREG?%13%%13%%10%+CGREG: 0,2%13%%10%%13%%10%OK%13%%10% AT+CGREG?%13% 67 98>AT+CGREG?%13%%13%%10%+CGREG: 0,2%13%%10%%13%%10%OK%13%%10% AT+CGREG?%13% 98 1>AT+CGREG?%13%%13%%10%+CGREG: 0,2%13%%10%%13%%10%OK%13%%10% AT+CGREG?%13% 1 32>AT+CGREG?%13%%13%%10%+CGREG: 0,2%13%%10%%13%%10%OK%13%%10% AT+CGREG?%13% 32 63>AT+CGREG?%13%%13%%10%+CGREG: 0,2%13%%10%%13%%10%OK%13%%10% AT+CGREG?%13%

And it goes no further. Could this be an issue of power as its only plugged into my laptop? Or is an issue with the code?

If someone could help me I would greatly appreciate it!

Thanks, Fiona

You really need a substantial power supply with any GSM/GPRS shield. Depending on various factors they can draw up to 2 amps momentarily when transmitting, and this includes handshaking with the network.

The Arduino M10 shield is better than some as it uses large capacitors to cope with these sudden demands. If there isn't enough capacity then the voltage will dip below a certain threshold and the modem chip will shut down.

There is a very simple test sketch at the bottom of the page my signature links to that will allow you to test the shield. No libraries, nothing to get in the way.

Oh thank you for replying!

I think it was an issue of the sim I was using and the power because it is sending the sms now! But I don’t think theyre delivering! :frowning: