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.")

thanks

I m not getting the values of latitudes and longitudes and I used gpsdData.py..plz help me out

I have this issue in RaspberryPi (Raspbian):

I did => sudo apt-get install python-gps and executed gpsdData.py script
I am getting the following error. Can someone please help?

Traceback (most recent call last):
File "/home/pi/Desktop/pythonGPSData.py", line 29, in
gpsp = GpsPoller() # create the thread
File "/home/pi/Desktop/pythonGPSData.py", line 19, in init
gpsd = gps(mode=WATCH_ENABLE) #starting the stream of info
NameError: global name 'gps' is not defined

Hi. I do have similar problem on GPSData.py code.
Traceback (most recent call last):
File "/home/pi/Desktop/pythonGPSData.py", line 29, in
gpsp = GpsPoller() # create the thread
File "/home/pi/Desktop/pythonGPSData.py", line 19, in init
gpsd = gps(mode=WATCH_ENABLE)

can u help to troubleshoot this problem sir?

@NoelBroda https://stackoverflow.com/questions/3295065/gpsd-python-client

I m not getting the values of latitudes and longitudes and I used gpsdData.py..plz help me out

pls somebody help out to get the values of longitude and latitudes

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

how i can solve this problem?

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)

i want gps python code please help me

1. I want to put the coordinates where I want
2. I want the word "arrival" to appear when I arrive at the desired coordinates
3. I want to see the error rate

please help me please

@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.