Getting NMEA string from GPS module to your Raspberry PI B+ [duplicate]

Question

I would like to ask if it possible to get NMEA code/string from a GPS module that connected to one of the GPIO of a Raspberry?

Answer 1

You don't mention which GPS module you have, so I can not provide a definitive yes, but given the right GPS module it is possible using the UART (tx/rx pins). Another alternative depending on your module is to use one of the USB ports (either directly connected for modules that have a usb cable or via a USB to TTL cable). Adafruit has a complete tutorial covering the use of a GPS module with the Raspberry Pi.

Answer 2

Getting GPS's Data: GPS receives data from output NMEA0183, tcp: // 2947, class: TPV & amp; tag: GPGGA.

Next is the step in the terminal to access GPS data:

1. Install: gpsd, gpsd-clients. (Note: install both use apt-get install)
2. Reboot (sudo reboot or sudo init 6)
3. Sudo dpkg-reconfigure gpsd (Note: configuration baudrate = 9600, 8 N 1 data format).
4. Serial tests with the command: gpspipe -r or cat /dev/ttyS* or /dev/ttyUSB* (Note: the * sign matches the read, use command ls /dev/ttyS*, /ttyS*, /ttyAMA* or /ttyUSB* or others).

5. If point 3 fails, stop and disable socket 2947 for a while. Try to type with the command & then reboot Raspberry Pi immadiately:

   $ sudo systemctl stop gpsd.socket

   $ sudo systemctl disables gpsd.socket

6. Then start and enable gpsd socket with command:

   $ sudo systemctl start gpsd.socket

   $ sudo systemctl enables gpsd.socket

7. Start daemon using command:

   $ sudo gpsd /dev/ttyS0 –F /var/run/gpsd.sock

8. For live straming:

   $ cgps –s or $ cgps or gpsmon

In practice way to get stream data GPS from NMEA Output, you can also use a simple command:

$ timeout 10s gpspipe -w -n 10 | grep -m 1 speed

$ timeout 10s gpspipe -w -n 10 | grep -m 1 speed | jq

Using json query / jq for pretty printing.

In python script:

def getGPS():
    gpspipe= "timeout 10s gpspipe -w -n 10 |  grep -m 1 speed"
    p = subprocess.Popen(gpspipe, stdout = subprocess.PIPE, shell = True)