How do I know if my GPS module is not defective?

End-Of-Life Products & Services RePhone
#1

I received GEO kit. I assembled it and tried GPS example program that came with SDK. In the Monitor Tool the log file states a message “open failed”. That’s one of the INFO messages your example code writes to the log. I tried this with module exposed to an open sky as well. Seems to be not working. Is there a way I can find out if the GPSv2 module is working fine by sending it commands via the monitor tool? Please help.

#2

The “open failed” is more like it can’t even reach the module - maybe defective module, maybe just bad connection. Check the cables first :slight_smile:

#3

Hi, maybe you can check GPS as these steps.

  1. Downdload the Arduino IDE for RePhone( seeedstudio.com/wiki/Arduino … ePhone_Kit );
  2. Select MTK USB Debug Port ,upload the GPS test code, …\Arduino_IDE_for_RePhone\hardware\arduino\mtk\libraries\LGPS\examples\gps_test;
  3. Switch the selected COM Port to MTK USB Modem Port and open the Serial Monitor;
  4. When have been located, these information will output. But if haven’t been located it also output information about a running UTC time.
    GPS UTC:16-2-19 2:20:21
    GPS status is A
    GPS latitude is N:22.587675
    GPS longitude is E:113.941322
    GPS speed is 0.070000
    GPS course is 21.940001
    GPS position fix is 1
    GPS sate used is 6
    GPS altitude is 78.809998
    GPS mode is A
    GPS mode2 is 3
#4

@dbelam: Yes I did check the cable. It’s connected properly. Still not working. Thanks anyway.

#5

@jinyuan.weng: well I am using Eclipse IDE with C, C++ SDK. I tried the sample program that came along with SDK which should output the GPS data on the monitor. No luck. Thanks anyway.

#6

You should even check the pins on the module side - if you have a multimeter with small probes. I’d check both power and data lines.

Oh, and if you can hack it together: alexandru.m.ghe showed me a great Arduino project, called I2C scanner.
If that finds the GPS module, than it’s working.
playground.arduino.cc/Main/I2cSc … lock&num=1

#7

Just in case this helps…
I couldn’t get the GPS module to work using the Eclipse IDE so I reverted to using the Arduino IDE (flashed firmware first). Still didn’t work. Compared the Arduino example sketch gps_test with the hello_world example on the Wiki page. The gps_test uses the Serial1.print() function. The hello_world uses the Serial.print() function. So changed all the Serial1 to Serial. It now works.

(I’ll get back to Eclipse after I’ve done a bit of reading - not getting this Event-driven Programming Model at all.)