Writing Code to Record GPS data

[MariusMoldovan]

Hello

I’m working on a school project and attempting to build a GPS that is capable of recording data from the GSM, streamed through the usb, into a text file. When I test the code I’ve written, based on the code made available on this site, it seems that the gps isn’t sending any more data than the first lat lon line, and similar variations of that data line, into the delineated text file I’ve set up. My code is based on the code provided on this site. Can you take a look at it and let me know what you think is wrong with it?

[PeterP]

can you please upload the file again, it looks like there was a security issue.. which I have now fixed

Peter --OzzMaker.com --

[MariusMoldovan]

Sure. To clarify, either the code is making the device only output that first line or there is an issue with the device logging data once it is used in something like a vehicle. My trials were all vehicle based and I made sure that the module had a fix before departure and maintained a fix. Since it was outputting latitude and longitude and not “0.0” for both fields, i assume the device had a fix.

Attachments:

1. gpsTotext.zip

[PeterP]

I tried your code, and it worked fine for me.
Below is the contents of the file;

pi@raspberrypi:~ $ tail -f test.txt
latitude , longitude , time , altitude , epv , ept , speed , climb, hour
-33.779926333 , 151.111997333 , 98.5 , 42.78 , 0.005 , 0.037 , nan , 11:41
-33.7799275 , 151.112000167 , 98.4 , 43.01 , 0.005 , 0.175 , nan , 11:41
-33.779929167 , 151.112002167 , 98.2 , 40.94 , 0.005 , 0.102 , nan , 11:41
-33.779930833 , 151.112003667 , 98.0 , 43.01 , 0.005 , 0.093 , nan , 11:41
-33.779931167 , 151.112002333 , 97.9 , 43.01 , 0.005 , 0.078 , nan , 11:41

Update your code to print report to the terminal, just add it after gpsd.next()

    while True:
        report = gpsd.next() #
        print report
        if report['class'] == 'TPV':

See if your output is similar to mine below;

pi@raspberrypi:~ $ python problem.py
<dictwrapper: {u'release': u'3.17', u'proto_major': 3, u'rev': u'3.17', u'class': u'VERSION', u'proto_minor': 12}>
<dictwrapper: {u'class': u'DEVICES', u'devices': [{u'parity': u'N', u'activated': u'2020-04-24T10:42:17.251Z', u'driver': u'u-blox', u'subtype': u'SW ROM CORE 3.01 (107888),HW 00080000,FWVER=SPG 3.01,PROTVER=18', u'bps': 115200, u'flags': 1, u'stopbits': 1, u'path': u'/dev/ttyACM3', u'cycle': 1.0, u'class': u'DEVICE', u'mincycle': 0.25, u'native': 0}]}>
<dictwrapper: {u'pps': False, u'enable': True, u'scaled': False, u'raw': 0, u'json': True, u'nmea': False, u'timing': False, u'class': u'WATCH', u'split24': False}>
<dictwrapper: {u'status': 2, u'epx': 6.598, u'epy': 4.299, u'epv': 8.682, u'ept': 0.005, u'lon': 151.111978833, u'eps': 13.2, u'lat': -33.779932167, u'track': 0.0, u'mode': 3, u'time': u'2020-04-24T10:42:18.000Z', u'device': u'/dev/ttyACM3', u'alt': 91.5, u'speed': 0.103, u'class': u'TPV'}>
<dictwrapper: {u'status': 2, u'epx': 6.598, u'epy': 4.299, u'epv': 8.682, u'ept': 0.005, u'lon': 151.1119795, u'eps': 13.2, u'lat': -33.779932167, u'track': 0.0, u'mode': 3, u'time': u'2020-04-24T10:42:19.000Z', u'device': u'/dev/ttyACM3', u'alt': 91.5, u'speed': 0.105, u'class': u'TPV'}>

Peter --OzzMaker.com --

[PeterP]

BTW:copy and paste the outputs above into a text file. Its hard to read here in the forum due to the word wrapping

Peter --OzzMaker.com --

[MariusMoldovan]

I made the adjustment to the code. I attached a copy of it.

Attachments:

1. print_report.txt

[PeterP]

your output looks good. I cant workout why you are not getting all the data in your file.

1Can you upload the first 100 lines of your file so I can have a look.

Can you move the print statement to be in the loop after it finds TPV… like below. When you run it, does it keep printing out the TPV data or does it only do it once and stop?

 while True:
report = gpsd.next() #
if report['class'] == 'TPV':
print report
lat = float(getattr(report,'lat',0.0))

Can you also show a few lines of the NMEA sentences when you run gpsmon -n

 

Peter --OzzMaker.com --

[Author]

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