Hi,
I have a SIM900 module connected to an Arduino Mega board. I can get the time from the SIM900 using the "AT+CCLK?" command on the serial monitor. The SIM900 has a battery so it keeps time even if powered off. Is there a method to use the RTC from the SIM900 for the Arduino? I have scoured the internet but haven't found a proper solution.
Using that command gives you what you want, you just need to convert it to your desired format. I do not have that module but I assume you are getting a string.
It is. You must first set the gsm module in text mode, then call for "AT+CCLK?". The response can be stored in a string. Then, you must parse the string with year, month, day, hour, minutte, secound to variables. Since you have 2560 mega, avoid using software serial.
Sidenote:I use simcom 7000 myself, it have gps reciver. So once in the day, it get the gps time and set a ds3231 rtc. I minimize sending at commands to my simcom 7000, so it is always ready to recive and send sms messages, performing various tasks.
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