137 lines
3.7 KiB
Markdown
137 lines
3.7 KiB
Markdown
# GPS
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Location fun. Tracking, logging, etc
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## Inspiration / Further Reading
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- [https://github.com/wadda/gps3](https://github.com/wadda/gps3)
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- [https://learn.adafruit.com/adafruit-ultimate-gps-on-the-raspberry-pi?view=all](https://learn.adafruit.com/adafruit-ultimate-gps-on-the-raspberry-pi?view=all)
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- [https://learn.adafruit.com/assets/3715](https://learn.adafruit.com/assets/3715)
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- [https://learn.adafruit.com/adafruit-ultimate-gps?view=all](https://learn.adafruit.com/adafruit-ultimate-gps?view=all)
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- [https://stackoverflow.com/questions/16989153/saving-gps-data-as-gpx](https://stackoverflow.com/questions/16989153/saving-gps-data-as-gpx)
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- [http://www.catb.org/gpsd/gpspipe.html](http://www.catb.org/gpsd/gpspipe.html)
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- [http://www.catb.org/gpsd/gpsd-time-service-howto.html#_feeding_chrony_from_gpsd](http://www.catb.org/gpsd/gpsd-time-service-howto.html#_feeding_chrony_from_gpsd)
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- [http://thomasloughlin.com/gpspipe-gps-client/](http://thomasloughlin.com/gpspipe-gps-client/)
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## Hardware
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The author chose the [Adafruit Ultimate GPS Breakout (link)](https://www.adafruit.com/product/746) for this guide. YMMV with other boards.
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## Setup
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``` bash
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armbian-config # enable hardware uarts
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apt install gpsd gpsd-clients python-gps gpsbabel # necessary software
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systemctl stop gpsd # stop gpsd to help with testin
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gpsd -n -N -D 2 /dev/ttyS2 # run gpsd by hand
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cgps -s # run a cli client to verify it works
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```
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Setup necessary ```gpsd``` defaults (daemon that provides location data to programs).
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Edit ```/etc/default/gpsd```
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- Add ```/dev/ttyS2``` to ```DEVICES```
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- Add ```-n``` to ```GPSD_OPTIONS```
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## Chrony
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Add GPS as a time source to chrony
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``` bash
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cat >> /etc/chrony/chrony.conf <<EOF
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# set larger delay to allow the NMEA source to overlap with
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# the other sources and avoid the falseticker status
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refclock SHM 0 refid GPS precision 1e-1 offset 0.9999 delay 0.2
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refclock SOCK /var/run/gpsd.sock refid PPS
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EOF
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systemctl restart chrony
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cgps # look for ```Status: 3D FIX```
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chronyc sources # Should see GPS and SOC1 with times for recent samples
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```
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## GPX Tracks
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### NextCloud
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**GpxPod** for NextCloud is a good viewer for GPX track recordings
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### Tracking
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```gpspipe -r -d -l -o /tmp/xxx.nmea``` will record the raw GPS data from the module. Can be used for tracking.
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### GPX Files
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You can convert raw ```nmea``` data from ```gpspipe``` using ```gpsbabel```
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Examples
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- ```gpsbabel -t -r -w -i nmea -f /tmp/xxx.nmea -o gpx -F xxx.gpx```
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- ```gpsbabel -t -i nmea -f /tmp/xxx.nmea -x track,pack,split=5m,title="LOG # %Y%m%d-%H%M" -o gpx -F out.gpx```
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## Automatic Logging
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The Python program used here is in the ```scripts``` directory.
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``` bash
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mkdir -p /tank/gps_data
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chown -R gpsd:root /tank/gps_data
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# put gpslog.py at /usr/local/bin
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cat > /etc/systemd/system/gps-logger.service <<EOF
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[Unit]
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Description=Simple gps logger
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After=gpsd.service gpsd.socket
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[Service]
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User=gpsd
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ExecStart=/usr/local/bin/gpslog.py
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Restart=on-failure
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[Install]
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WantedBy=multi-user.target
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EOF
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systemctl daemon-reload
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systemctl enable gps-logger
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systemctl start gps-logger
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```
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## Setup Auto GPX Track Creation/Upload
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A handy trick for auto-converting your GPS log data as well as uploading it to NextCloud. The Python program used here is in the ```scripts``` directory.
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``` bash
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cat > /etc/systemd/system/gpsconvert.service <<EOF
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[Unit]
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Description=Merge GPS logs and upload to NextCloud
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After=gps-logger
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[Service]
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ExecStart=/usr/local/bin/gpsconvert.py
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EOF
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cat > /etc/systemd/system/gpsconvert.timer <<EOF
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[Unit]
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Description=Run GPS log merge
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[Timer]
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OnCalendar=hourly
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Persistent=true
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[Install]
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WantedBy=timers.target
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EOF
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systemctl daemon-reload
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systemctl enable gpsconvert.timer
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systemctl start gpsconvert.timer
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```
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