GPS time from PyTrack

[jmpratt]

Is there a way to use the GPS time to set the RTC? I want to be able to log data from remote locations with no wifi access. I want the unit to be able to set the RTC to the correct time upon reset.

[livius]

@jmpratt
use https://github.com/inmcm/micropyGPS library
and there you have possibility to aqquire time from GPS
and next it is simple to set it to the rtc.init https://docs.pycom.io/chapter/firmwareapi/pycom/machine/RTC.html#rtcinitdatetimenone-sourcertcinternalrc

[jmpratt]

So does the GPS on the PyTrack communicate via a WiPy UART?

[seb]

@jmpratt

It uses I2C to communicate

[jmpratt]

@seb Thanks. Is there a list of I2C commands that the GPS module supports?

[seb]

@jmpratt
http://www.quectel.com/UploadImage/Downlad/Quectel_L76-L_I2C_Application_Note_V1.0.pdf

[jmpratt]

@seb Does Pycom have any example code that uses the GPS on the PyTrack? All I can find is the code that uses the accelerometer.

[seb]

@jmpratt

Check https://github.com/pycom/pycom-libraries

[jmpratt]

@seb Got it. Thanks!

[jmpratt]

Ok, I'm confused. Here's a link for a project using the PyTrack with the micropyGPS module: https://github.com/ozeta/iot-gps-receiver. If the PyTrack uses I2C to communicate with the GPS chip, how can micopyGPS communicate with the chip via the UART?

[seb]

@jmpratt

I see no mention of UART in the linked code

[jmpratt]

@seb It looks like he's using both the micropyGPS and L76GNSS modules, which doesn't make any sense to me. Here he talks about seeing output on a UART with a PyTrack and the micropyGPS module: https://github.com/inmcm/micropyGPS/issues/7

Is he using the L76GNSS module to pull a NMEA sentence and then send it to the micropyGPS module for handling?

Anyone know of a way to contact an author on GitHub?

[robert-hh]

@jmpratt said in GPS time from PyTrack:

Anyone know of a way to contact an author on GitHub?

Raise an issue, then the owner will be notified.

[seb]

@jmpratt

The L76GNSS library provided by pycom reads the NMEA sentences via I2C, there is no UART involved. The linked to code uses L76GNSS to get the sentenaces, and then micropyGPS to parse them

[jmpratt]

@seb Ok. Thanks for the confirmation. I appreciate the help.

[andrethemac]

@jmpratt I've had the same question, and was looking for a library that didn't use to much memory. So I wrote it myself (based upon the default library and @Neuromystix idea's. https://github.com/andrethemac/L76GLNSV4

best regards

[jmpratt]

@andrethemac Thanks for letting me know! Your library is just what I was looking for.