Pytrack GPS library



  • Hi there!

    Can you recommend me a library for pytrack?
    What's in the documentation is very basic.
    It would be nice to get information some additional information like, time, altitude, speed, Visible satelites, etc?
    What library did you used and what was the project?
    (I am working on a weather ballon)

    Thanks! :)



  • @tttadam Hi. Looks like you might have found my L76micropyGPS.py useful. Any feedback welcome! I just updated the doco as the issue has been resolved, and I had not updated the README.



  • I found the issue.
    I gave my I2C object an ID = 1, and that solved the issue.



  • This post is deleted!


  • @jcaron Fair enough, sorry. :)

    This is how my boot.py looks like,
    the GPS set up is from line 50 to 60. This part is run alright, expect some rare cases minor issues with the rtc setup:

    # # this runs first
    # #TODO: CLEAN IT up, SD Class(inprogress),
    import pycom
    import os
    import math
    import machine
    from machine import SD, Pin, UART
    from pytrack import Pytrack
    import utime
    import time
    import _thread
    import gc
    from L76micropyGPS import L76micropyGPS
    from micropyGPS import MicropyGPS
    #my classes
    from  rgbsignal import RGBSignal
    from sdlogger import SDLogger
    
    uart = UART(0, baudrate=115200)
    os.dupterm(uart)
    
    #TODO:test it, 	outsource it
    runcount = pycom.nvs_get('runcount')
    print("The current value of the run counter is: "+str(runcount))
    pycom.nvs_set('runcount', runcount+1)
    
    # this is the led notification class
    fb = RGBSignal() 
    
    #the main file will be called
    machine.main('main.py')
    
    #buttonpin = Pin('G17', mode= Pin.IN, pull=Pin.PULL_UP) #button pin on expansion board
    buttonpin = Pin('G4', mode= Pin.IN, pull=Pin.PULL_UP) #button pin on pytrack board
    start = True
    print("Push the button for start booting")
    #def message(self, color="cyan", interval=0.5, iteration=3):
    _thread.start_new_thread(fb.message, ["cyan",0.1,0.3])
    while start:
        utime.sleep_ms(10)
        if buttonpin() == 0:
            start = False
    _thread.start_new_thread(fb.startup, [])
    print("Boot file process is started.")
    
    gc.enable()
    print("GC is enabled")
    print("Free Mem: {}".format(gc.mem_free()))
    
    #Setting up the gps:
    py = Pytrack()
    my_gps = MicropyGPS(local_offset=1,location_formatting='dd')
    L76micropyGPS = L76micropyGPS(my_gps, py)
    gpsThread = L76micropyGPS.startGPSThread()
    print("Waiting for gps signal")
    counter = 0
    while (my_gps.timestamp == (0, 0, 0)):
        print("Waiting for gps signal: "+str(counter)+" "+str(my_gps.date)+" "+str(my_gps.timestamp))
        counter +=1
        time.sleep(2)
    time.sleep(4)
    print("Date: "+str(my_gps.date))
    print("GPS signal is found")
    print("Time: "+str(my_gps.timestamp))
    time.sleep(2)
    print(my_gps.date[0])
    print(my_gps.date[1])
    print(my_gps.date[2])
    
    
    print("Setting up the RTC")
    rtc = machine.RTC()
    print("RTC before init: {}".format(rtc.now()))
    dateYear = int(str(20) + str(my_gps.date[2]))
    rtc.init((dateYear, my_gps.date[1], my_gps.date[0], my_gps.timestamp[0], my_gps.timestamp[1], int(my_gps.timestamp[2]), 0, 0)) #seting up the rtc 
    print("RTC is set : {}".format(rtc.now()))
    
    
    
    
    #Create logstructure after GPS initalizaed
    dataLogger = SDLogger(uart)
    dataLogger.sdFormat()
    foldername = str("Flight_"+
                 str(runcount)+"_"+
                 str(dateYear)+"-"+
                 str(my_gps.date[1])+"-"+
                 str(my_gps.date[0])+"_"+
                 str(my_gps.timestamp[0])+"-"+
                 str(my_gps.timestamp[1])+"-"+
                 str(int(my_gps.timestamp[2])))
    
    dataLogger.createFolder(foldername)
    logfilename = str("LogOfRun"+"_"+
              str(runcount)+"_"+
              str(dateYear)+"-"+
              str(my_gps.date[1])+"-"+
              str(my_gps.date[0])+"_"+
              str(my_gps.timestamp[0])+"-"+
              str(my_gps.timestamp[1])+"-"+
              str(int(my_gps.timestamp[2])))
    logheader = "TimeStamp;GPSTimeStamp;Sensor;Value;Location"
    dataLogger.creatLogFile(logheader,logfilename)
    # #TODO: Create separate log for sytemlog, telemetry, and sensor data
    

    After the boot.py main.py is next, This fails at line 30, when I create the I2C object. With an OSError: I2C bus error in L76micropyGPS.py at line 54.

    from machine import I2C, Pin, UART
    import machine
    from SI7021 import SI7021
    import gc
    import _thread
    #my classes
    from  rgbsignal import RGBSignal
    from sdlogger import SDLogger
    
    
    start = True
    buttonpin = Pin('G4', mode= Pin.IN, pull=Pin.PULL_UP) #button pin on pytrack board
    _thread.start_new_thread(fb.message, ["yellow",0.1,3])
    print("Push the button for start main")
    while start:
        time.sleep_ms(10)
        if buttonpin() == 0:
            start = False
    _thread.start_new_thread(fb.startup, [])
    
    
    print("Main has started")
    print("Free Mem: {}".format(gc.mem_free()))
    i2c=I2C(0, I2C.MASTER)
    print(i2c.scan())
    


  • @tttadam unless you provide the full code you are using and full details of what is connected where there’s very little chance anybody is going to be able to help you.



  • I am having some issues with L76micropyGPS.py library, if I want to use the I2C.
    When I create an I2C object in the main.py

    i2c=I2C(0, I2C.MASTER)
    

    I got an OSError: I2C bus error in L76micropyGPS.py at line 54.
    I think it because me and the library both want to use I2C. But I would like to work with a temperature sensor wich communicates in I2C, and later I would like to chain other envirement sensors (as far as I know I can use multiple external sensor on the same pins. )



  • @jcaron Thank you.



  • @tttadam micropyGPS does not handle the I/O, it's up to you to feed it the data using the update function.

    You'll find an example here: https://github.com/gregcope/L76micropyGPS

    The core of it is really just:

        while True:
            # get some NMEA data
            someNmeaData = str(self.i2c.readfrom(GPS_I2CADDR, 128))
    
            # Pass NMEA data to micropyGPS object
            for x in someNmeaData:
                self.my_gps.update(str(x))
            time.sleep(0.25)


  • @jcaron Yes you are right, I wasn't profound enough.
    micropyGPS looks really powerful. However, It's not clear for me how to use it.
    Because this library for uart, but pytrack use I2c am I missing something?
    Is there a sample code where I can start? micropyGPS use predifined gps sentences.
    Thanks in advance.




 

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