Pytrack example code from github not working

  • Hello.
    I have a problem. I tried get my Pytrack device to work on my Lopy with the example code from github/pycom-libraries/pytrack but I only received (None, None) from the coordinates.
    I have already updated both my Lopy and Pytrack to the latest version '1.9.0.b1' and '0.0.4'.
    This is the screen shot of the output from the example code:
    Can anyone help me? Thank you very much!

  • administrators

    @crumble You are correct the code gets the time from a NTP server via WiFi but the example does not connect to any WiFi networks with internet access so this fails hence the time remains at 1970

  • @dylan Well I stood out in the field for awhile longer this time and successfully got coordinates, very exciting, I am however still in 1970, but that's not really an issue.

    The time of the example is set with NTP over WiFi. There is no code to get the time from GPS. The sentence used by the code shall contain a UTC time information. But I have not seen it yet. Maybe because I was indoor.

  • @dylan Well I stood out in the field for awhile longer this time and successfully got coordinates, very exciting, I am however still in 1970, but that's not really an issue.

  • I was wondering if anyone in this thread would be able to share their successful code for this example? I have run the example code without any alterations and I'm still in the 70's also not getting any coordinates (even after sitting outside for awhile). I am also running into an error after about 6 or more attempts:
    Traceback (most recent call last):
    File "<stdin>", line 36 in <module>
    File "/flash/lib/", line 56, in coordinates
    MemoryError: memory allocation failed, allocating 3991 bytes

  • @movsun Hi, can u share how u work with the pytrack and get the latitude and longitude data? i have pytack with lopy and another one is lopy with expansion board.
    appreciate for your sharing and help.

  • administrators

    You can also alter the timeout GPS to 60 seconds to allow more time to acquire a GPS signal.

  • @mj some statementens seem to be unbreakable. For example: waiting blocked for LoRa messages. In this case you can only hope to replug the Lopy and restart Atom as long as you manage to break the program in the small runtime before it reaches the main loop with the wait statement. But you can try to upload a version with FTP and restart the LoPy.

    My sender has a switch which breaks the main loop. The sender will than send a message to the receiver, which stop its main loop. So both LoPys will be in a state where I can reconnect.

  • Thanks @crumble . By the way i facing the problem while connecting my pytrack. i have updating my firmware. When i wanna connect my pytrack i try to get the serial port but unsuccessful it show up the error. May i know how to fix it ?

    0_1507794670485_error com.JPG

  • @mj this depends on zour IDE. If you use the Atom plugin, you simply place the lib in your project folder and it will be uploaded to your LoPy, if your are connected to the REPL and press the sync button.

    But you can use FTP as well. In this case you upload the library files into the /flash[/lib] folder.

  • Hi @Movsun , i am new to the pytrack device. Currently, i am trying out to get the latitude and longitude as what you have done. May i know how you work on it? How can i upload the libraries from github to the device? Thank You.

  • [Update]. it work now after I put in outside for awhile. Sorry

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