How to get GPS data?

Raspberry Pi Network HATs 3G/4G&LTE Base HAT
,
1

Tried to get GPS position but not getting a response.

I turn on the GPS with:

AT+QGPS=1

that works fine (I get an OK response). But then I send the command:

AT+QGPSLOC=2

and not response is given by the module.

2

Hi @miguel.won,
Read the data from another port.(ex. /dev/ttyUSB1)
Python code to obtain the GPS values:

  1. Download gpstest.py script
    wget https://raw.githubusercontent.com/sixfab/Sixfab_RPi_3G-4G-LTE_Base_Shield/master/tutorials/GPS/gpstest.py

  2. Change the permission of the script.
    sudo chmod +x gpstest.py

  3. And run the code with the following command.
    sudo python3 gpstest.py

19-1-1024x509 png 1024×509
19-1-1024x509 png 1024×5091022×507 126 KB

And ensure that you are able to see the sky.

Best regards.

3

Thanks.
I’m getting some odd raw data:

Receiving GPS data
raw: b'$GPVTG,,T,,M,,N,,K,N*2C\r\n'
Printed data is b'$GPVTG'
raw: b'$GPGSA,A,1,,,,,,,,,,,,,,,*1E\r\n'
Printed data is b'$GPGSA'
raw: b'$GPGGA,,,,,,0,,,,,,,,*66\r\n'
Printed data is b'$GPGGA'
raw: b'$GPRMC,,V,,,,,,,,,,N*53\r\n'
Printed data is b'$GPRMC'
raw: b'$GPVTG,,T,,M,,N,,K,N*2C\r\n'
Printed data is b'$GPVTG'
raw: b'$GPGSA,A,1,,,,,,,,,,,,,,,*1E\r\n'
Printed data is b'$GPGSA'
raw: b'$GPGGA,,,,,,0,,,,,,,,*66\r\n'
Printed data is b'$GPGGA'
raw: b'$GPRMC,,V,,,,,,,,,,N*53\r\n'
4

Hi @miguel.won,

We recommend to test it under the open sky. How long did you test it?
Did you check the antenna if they are loosely connected? Did you try with a different antenna?

5

Ok, I will test in the open sky. Internet connection is ok.

Noob question about the antena. Do I have to connect a GPS antenna like this one?

Currently, I’m only using this antenna.

6

Yes, you should use a GNSS antenna.

7

Ok, thanks. That’s probably why I’m not reading good numbers. I’ll order a antenna.

8

The provided tutorial script requires a few modifications when working with python3.
Most notably serial requires encode() for writing and .decode() for reading.

1 Like
9

For those who might find this helpful. Open gpstest.py file.

Replace:
data = ser.readline()
With:
data = ser.readline().decode(‘utf-8’)

Replace:
serw.write(‘AT+QGPS=1\r’)
With:
serw.write(‘AT+QGPS=1\r’.encode())

10

Hi @ensar

I test your code, under the open sky but it didn’t work… !
image|690x169

image
image1511×371 59.6 KB

I followed your python code.

Before I set up my Base Hat with this tutorial : https://docs.sixfab.com/page/internet-connection-with-quectel-ec25-by-using-ecm-mode

Any idea please?

Thanks for your help!

Jacques

11

Hi Jacques,

Please follow the updated tutorial here:

12

Thanks a lot!!
It works!
But where can I find this tutorial? I didn’t find it before…
Thanks for your help :slight_smile:
Jacques

13

You can find it on the tutorials page or the tutorials tab of the product or you can use the search box to search all documents