Hi All,
I'm having problems with a custom board that I have built with the GSM module SIM800C. I've got it connected to the ATMega through software serial and I am communicating with it fine but I cannot get the SIM card to be detected. I send the 'AT+CPIN' and get the response 'SIM Not Inserted'
I think I've tracked it down to the SIM_VDD not supplying power but can't figure out why it isn't getting there. I've basically pulled the schematic from the adafruit FONA board so I don't think design is the problem, and I've checked the traces to make sure the is a real connection.
Has anyone used this module in the past, is there a specific AT command I should be sending first to get the SIM card running? I've got a Ting GSM sim that was recommended for this, activated it and tested it successfully in my cell phone. I'm grasping at straws at this point so any insight would be great!