CODEWITHSUNDEEP
pythongps
Wmaz
Wmaz

Reputation: 1

DeLorme USB GPS into Raspberry Pi using Python

I have a DeLorme Earthmate LT-40 USB GPS device that I used years ago with a Windows XP program. Out of curiosity I plugged it into my Raspberry Pi to see if I could read the data. I've managed to see data using sudo gpsmon at the command prompt so I would like to take this a step further and write a Python program to read the data. Not knowing very much about Python I've searched YouTube and google for possible solutions. It looks like that I need to import pynmea2. I used pip install pynmea2 to install the module. I keep getting 

"ModuleNotFoundError: No module named pynmea2"

when I try to run my script. I tried to reinstall pynmea2 again which gave me 

Requirement already satisfied: pynmea2 in ./.local/lib/python2.7/site-packages(1.15.0).

I don't understand what I'm doing wrong. Any help would be greatly appreciated. Thank you.

Upvotes: 0

Views: 364

Answers (1)

Flavio Buccianti
Flavio Buccianti

Reputation: 31

I have the older version LT-20 of that GPS and usually it presents itself as ttyUSB0 (in my case) when I plug it on Raspberry.

Just do a dmesg command to see in which port it is being recognized, then you can do a cat /dev/ttyUSB0 command and you see all the messages coming from your GPS. The messages start with a $GP for each type of frame. See detailed $GP description at: http://aprs.gids.nl/nmea/ .

Then from your python program, you can open /dev/ttyUSB0 as a file (as read only) and handle each frame and interpetting it according to its format.

Best regards Flavio

Upvotes: 1

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