bouvett2
Newbie level 5
Hi Guys,
I am currently working on a project which uses the SIM908 module to get GPS co-ordinates of a moving vehicle. The SIM908 is installed on a custom PCB and operating from a 3.7V battery.
The firmware which interfaces with the SIM908 first powers on the GPS module AT+CGPSPWR = 1
Then removes the reset setting
AT+CGPSRST = 0
Then it requests data from the module
AT+CGPSINF = 0
The problem is that I always read the co-ordinates as 0. I have given it enough time for cold starting, yet the problem persists. When I send the above commands, I always receive an OK as feedback as specified in the datasheet. It seems as if the GPS antenna cannot sync. I have used the same GPS antenna and commands on an ITEAD development board and it works successfully.
The PCB was designed according to the hardware design guideline.
Any help is appreciated.
I am currently working on a project which uses the SIM908 module to get GPS co-ordinates of a moving vehicle. The SIM908 is installed on a custom PCB and operating from a 3.7V battery.
The firmware which interfaces with the SIM908 first powers on the GPS module AT+CGPSPWR = 1
Then removes the reset setting
AT+CGPSRST = 0
Then it requests data from the module
AT+CGPSINF = 0
The problem is that I always read the co-ordinates as 0. I have given it enough time for cold starting, yet the problem persists. When I send the above commands, I always receive an OK as feedback as specified in the datasheet. It seems as if the GPS antenna cannot sync. I have used the same GPS antenna and commands on an ITEAD development board and it works successfully.
The PCB was designed according to the hardware design guideline.
Any help is appreciated.
