python-gps sample codes, Raspberry Pi 4 + u-blox GPS module (uart)

README.md

Raspberry Pi 4 + u-blox GPS module (uart)

$ sudo apt-get update
$ sudo apt-get install gpsd gpsd-client python-gps

Enable the serial interface and disable serial login shell with raspi-config then reboot. Confirm /dev/ttyS0 exists

$ ls -l /dev/serial*
lrwxrwxrwx 1 root root 5 May  9 10:38 /dev/serial0 -> ttyS0
lrwxrwxrwx 1 root root 7 May  9 10:38 /dev/serial1 -> ttyAMA0

Configure gpsd to use /dev/ttyS0 in /etc/defaults/gpsd then restart gpsd service. Use cgps command to make sure it works.

gps_demo.py

# Deprecate. The latest gps python module has been changed significantly.

import gps, os, time

session = gps.gps()

while 1:
    os.system('clear')
    session.query('admosy') 
    # a = altitude, d = date/time, m=mode,  
    # o=postion/fix, s=status, y=satellites

    print
    print ' GPS reading'
    print '----------------------------------------'
    print 'latitude    ' , session.fix.latitude
    print 'longitude   ' , session.fix.longitude
    print 'time utc    ' , session.utc, session.fix.time
    print 'altitude    ' , session.fix.altitude
    print 'eph         ' , session.fix.eph
    print 'epv         ' , session.fix.epv
    print 'ept         ' , session.fix.ept
    print 'speed       ' , session.fix.speed
    print 'climb       ' , session.fix.climb
    
    print
    print ' Satellites (total of', len(session.satellites) , ' in view)'
    for i in session.satellites:
        print '\t', i

    time.sleep(3)

gpsdData.py

#! /usr/bin/python
# Written by Dan Mandle http://dan.mandle.me September 2012
# License: GPL 2.0
# Updated by wolfg1969 https://guoyong.dev May 2020
 
import os
from gps import *
from time import *
import time
import threading
 
gpsd = None #seting the global variable
 
os.system('clear') #clear the terminal (optional)
 
class GpsPoller(threading.Thread):
  def __init__(self):
    threading.Thread.__init__(self)
    global gpsd #bring it in scope
    gpsd = gps(mode=WATCH_ENABLE) #starting the stream of info
    self.current_value = None
    self.running = True #setting the thread running to true
 
  def run(self):
    global gpsd
    while gpsp.running:
      gpsd.next() #this will continue to loop and grab EACH set of gpsd info to clear the buffer
 
if __name__ == '__main__':
  gpsp = GpsPoller() # create the thread
  try:
    gpsp.start() # start it up
    while True:
      # It may take a second or two to get good data
      # print(gpsd.fix.latitude,', ',gpsd.fix.longitude,'  Time: ',gpsd.utc)
 
      os.system('clear')
 
      print
      print(' GPS reading')
      print('----------------------------------------')
      print('latitude    ', gpsd.fix.latitude)
      print('longitude   ', gpsd.fix.longitude)
      print('time utc    ', gpsd.utc, ' + ', gpsd.fix.time)
      print('altitude (m)', gpsd.fix.altitude)
      print('eps         ', gpsd.fix.eps)
      print('epx         ', gpsd.fix.epx)
      print('epv         ', gpsd.fix.epv)
      print('ept         ', gpsd.fix.ept)
      print('speed (m/s) ', gpsd.fix.speed)
      print('speed (mph) ', gpsd.fix.speed * 2.237)
      print('climb       ', gpsd.fix.climb)
      print('track       ', gpsd.fix.track)
      print('mode        ', gpsd.fix.mode)
      print
      print('sats        ', gpsd.satellites)
 
      time.sleep(5) #set to whatever
 
  except (KeyboardInterrupt, SystemExit): #when you press ctrl+c
    print("\nKilling Thread...")
    gpsp.running = False
    gpsp.join() # wait for the thread to finish what it's doing
  print("Done.\nExiting.")

@ewe-akj Do you wanna a paid support for you requirements?

What version of gpsd does this target? There is no query() in my gps object under Python 2.7 on Ubuntu 16.04 (arm64) .

Use Python 3 and gpsdData.py.

Thank you for this. Is there a way to get the speed in km/h instead of m/s?? I've tried taking "gpsd.fix.speed" value and then converting that into km/h. But unfortunately that wasn't fruitful, I tried something like this

speed = gpsd.fix.speed
km_h = ((speed*18)/5)

@dear-stan The formula is correct.