SIM7600G-H 4G HAT (B) for Raspberry Pi GPS stopped working

1

Hi

I had this HAT working with Python and was getting GPS coordinates. But since last week or thereabouts, I have stopped getting GPS fixes. I am only getting +GPSINFO, result.

The sample GPS script fails to execute as it exits.

I thought this was due to the cloudy weather but I tried in an open area with bit of clear sky with still no luck.

Minicom returns the same result with AT command.

Any ideas of what’s wrong?

2

Hi Priyath,

This HAT is sensitive to weather so clouds and rain will lead to it losing it’s position. I also takes some time for it to get a lock.

Can you elaborate on this? What is printed when you try AT+CGPSINFO?

From the Product’s Wiki, this is how you test the GPS once it has a lock.

AT+CGPS=1	       //Open GPS
AT+CGPSINFO          //Print GPS information to the serial port
AT+CGPS=0          //Close GPS
3

Hi Jack

I am getting +CGPSINFO and a bunch of commas continuously.

This used to work perfectly week before. I continuously ran the script with no change.

4

Its hard to test if this is the GPS not getting a lock or a hardware issue. , are the commas consistent with the amount of things that should be printed?

Send us an email with your findings and we can start exploring the possibility of a hardware issue.

5

AT+CGPS=1,1
OK

+CGPSINFO: ,

after following waveshare FAQ I issued the below AT commands and now it is giving the below output
AT+CGPSNMEAPORTCFG=3
AT+CGPSNMEA=197119
AT+CGPSINFOCFG=10,31
AT+CGPSAUTO=1

OK
$GPGGA,0,66
$GPVTG,T,M,N,K,N2C
$GPRMC,V,N*53
$GPGSA,A,1,*1E

['AT+CGPSINFO\r\r\n+CGPSINFO: ', ‘’, ‘’, ‘’, ‘’, ‘’, ‘’, ‘’, ‘\r\n\r\nOK\r\n$GPGGA’, ‘’, ‘’, ‘’, ‘’, ‘’, ‘0’, ‘’, ‘’, ‘’, ‘’, ‘’, ‘’, ‘’, ‘66\r\n$GPVTG’, ‘’, ‘T’, ‘’, ‘M’, ‘’, ‘N’, ‘’, ‘K’, 'N2C\r\n$GPRMC’, ‘’, ‘V’, ‘’, ‘’, ‘’, ‘’, ‘’, ‘’, ‘’, ‘’, ‘’, ‘N*53\r\n$GPGSA’, ‘A’, ‘1’, ‘’, ‘’, ‘’, ‘’, ‘’, ‘’, ‘’, ‘’, ‘’, ‘’, ‘’, ‘’, ‘’, ‘’, ‘*1E’]
AT+CGPSINFO
+CGPSINFO: ,

when I run the Demo GPS.py I get the below output

image
image355×212 19.6 KB

1 Like
6

Hey @Priyath72854,

That output doesn’t seem to indicate any particular issue with your setup.

I would double-check your hardware setup for potential issues, especially the connection between the board and the antenna.

The output line $GPGSA,A,1,*1E tells us that the module is trying to find a GPS fix but can’t find one so it is likely a hardware or interference issue.

I would try disconnecting and securely reconnecting the antenna and giving the module as open a view of direct sky as you can.

If this doesn’t change the outcome let us know! :slight_smile:

7

Did you check the power supply? Is it sufficient?

1 Like