mardi 5 mai 2015

Make data from GPS adapter an object to render in Django

I've got a doozy for you Python and Django experts out there.

I am trying to read GPS coordinates from the AdaFruit Ultimate GPS hat that is soldered to a Raspberry Pi. Further I need to make an object that when printed, spits out the current Longitude and Latitude. Lastly, I need to present this data in a Django HttpResponse.

Folder Structure:

manage.py
hud/
  views/
     views.py
     gps_reader.py
  templates/
     hud/
        index.html 

I have a script that will gather the GPS coords among other things and print them to the console which works great. Here is that script in it's entirety:

gps_reader.py :

import os, time, threading
from gps import *
from time import *

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
      os.system('clear')
      print 'latitude    ' , gpsd.fix.latitude
      print 'longitude   ' , gpsd.fix.longitude
      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."

Here is my Django view.py:

from django.shortcuts import render
from django.http import Http404
import gps_reader.GpsPoller as GpsPoller

session = GpsPoller()
session.start()

def sensors(request):
    gps_lat = "{}".format(session.fix.latitude)
    return render(request, 'hud/index.html', {"gps_lat": gps_lat})

Finally, here is my simplified index.html:

<p>
Latitude: {{ gps_lat }} 
</p>

When I run the development server with the above settings, I get the following:

ImportError at /hud/
No module named GpsPoller
Request Method: GET
Request URL:    http://ift.tt/1Kf2EqR
Django Version: 1.8
Exception Type: ImportError
Exception Value:    
No module named GpsPoller
Exception Location: /home/pi/lab/django/pi/hud/views/views.py in <module>,       line 3
Python Executable:  /usr/bin/python
Python Version: 2.7.3

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