Updated GPS & Battery commands for Sim808 / FONA Shield. Also works for LoNet Sim808

Posted on October 23, 2015 at October 24, 2015 by Elijah

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Enable Charging Function

It is recommended to execute this process when first time to use the module. In the Serial Monitor columns of following tables, input of AT commands are in back, module returns values are in orange.

Serial Monitor	Description
AT OK	Send command “AT” to synchronize baud rate. Serial port of module is by default set at auto-baud mode, and in this mode, it will not output any indications when the module is on.
AT+ECHARGE=1 OK	Send command “AT+ECHARGE=1” to enable battery charging function. By default the charging function is closed.
AT&W OK	Save parameter setting.
AT+CBC +CBC: 1,96,4175 OK	Inquire charging status and remaining battery capacity.
AT+CSQ +CSQ: 14,0 OK	Inquire GSM signal quality.

Get location with GPS

Serial Monitor	Description
AT+CGPSPWR=1 OK	Open GPS
AT+CGPSSTATUS? +CGPSSTATUS: Location Not Fix OK	Read GPS fix status, “Location Not Fix” means that positioning is not successful. For the first time to start, it will take at least 30s. GPS must be tested by the window or outdoor.
AT+CGPSSTATUS? +CGPSSTATUS: Location 3D Fix OK	GPS has fixed with 3D status.
AT+CGPSINF=0 +CGPSINF: 0,2234.931817,11357.122485, 92.461185,20141031041141.000, 88,12,0.000000,0.000000	Get the current GPS location information. Parameters formate: <mode>, <altitude>, <longitude>, <UTC time>, <TTFF>, <num>, <speed>, <course>
AT+CGPSOUT=32 OK $GPRMC,043326.000,A, 2234.9414,N,11357.1187,E, 0.000,143.69,311014,,,A*50	Read NMEA $GPRMC data, of which, “2234.9414 N, 11357.1187 E” is the location coordinates. For more details about NMEA sentences, check this site.
AT+CGPSRST=0 OK	Reset GPS in Cold Start Mode.
AT+CGPSRST=1 OK	Reset GPS in Hot Start Mode.
AT+CGPSPWR=0 OK	Close GPS.

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Jens | November 12, 2018 at 8:14 pm

Hello.
I am running the SIM808 with Arduino Mega.
Using AT+ECHARGE=1 to enable and AT&W to store charging a LiPo for backup.
Doing AT+CBC always returns 0 for the first number, which means the LiPo is NOT charging.
Checking AT+ECHARGE? returns 1.
Shouldn´t AT+CBC return 1 in the beginning as well?
Thanks for any help.
Kind Regards,
Jens

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