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POWhy is output of GPS using python zero or Nan?
 

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  1. POWhy is output of GPS using python zero or Nan?
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    <p>I'm having troubles with GPS output. When i type:</p> <pre><code>$ cat /dev/ttyUSB0 </code></pre> <p>i have NMEA sentences coming out (it's what i want)</p> <pre><code>$GPGGA,134131.000,4548.0018,N,01557.1026,E,1,06,1.5,123.8,M,42.4,M,,0000*56 $GPGSA,A,3,12,15,24,17,22,18,,,,,,,2.3,1.5,1.8*30 $GPGSV,3,1,12,24,76,320,29,12,49,254,44,15,42,195,17,17,38,057,15*7A $GPGSV,3,2,12,25,15,249,,09,12,112,,26,11,162,,18,09,267,19*75 $GPGSV,3,3,12,22,08,297,23,14,08,323,,04,06,114,,28,03,061,*78 $GPRMC,134131.000,A,4548.0018,N,01557.1026,E,1.71,291.64,210513,,,A*67 </code></pre> <p>But, when i try to see output with python (this is basic code):</p> <pre><code>import gps session=gps.gps('localhost','2947') session.stream() print session </code></pre> <p>i got this:</p> <pre><code>Time: (nan) Lat/Lon: 0.000000 0.000000 Altitude: ? Speed: ? Track: ? Status: STATUS_NO_FIX Mode: MODE_NO_FIX Quality: 0 p=0.00 h=0.00 v=0.00 t=0.00 g=0.00 Y: 0 satellites in view: </code></pre> <p>I tried someone else's code but it always say NaN or 0:</p> <pre><code> #! /usr/bin/python # Written by Dan Mandle http://dan.mandle.me September 2012 # License: GPL 2.0 import os from gps import * from time import * import time import threading gpsd = None #seting the global variable os.system('clear') #clear the terminal (optional) class GpsPoller(threading.Thread): def __init__(self): threading.Thread.__init__(self) global gpsd #bring it in scope gpsd = gps(mode=WATCH_ENABLE) #starting the stream of info self.current_value = None self.running = True #setting the thread running to true def run(self): global gpsd while gpsp.running: gpsd.next() #this will continue to loop and grab EACH set of gpsd info to$ 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 '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 </code></pre> <p>Output:</p> <pre><code> GPS reading ---------------------------------------- latitude 0.0 longitude 0.0 time utc + nan altitude (m) nan eps nan epx nan epv nan ept nan speed (m/s) nan climb nan track nan mode 1 sats [] </code></pre> <p>So does somebody know why is this all zeros and unknown?</p> <p>Please help, i'm trying to fix it for a week now.</p> <p>Thanks</p>
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    1. USla lluvia
    1. USla lluvia
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    1. VO
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      1. POWhy is output of GPS using python zero or Nan?
      1. USThomas Fenzl
      1. VTFavorite
    2. VO
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      1. POWhy is output of GPS using python zero or Nan?
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      1. VTUpMod
    1. COmaybe gpsd is not running, try opening localhost:2947 in a browser
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      1. POWhy is output of GPS using python zero or Nan?
      1. USxuanji
    2. COit's running: root@beagleboard:~# ping localhost:2947 PING localhost:2947 (127.0.0.1): 56 data bytes 64 bytes from 127.0.0.1: seq=0 ttl=64 time=0.428 ms 64 bytes from 127.0.0.1: seq=1 ttl=64 time=0.274 ms 64 bytes from 127.0.0.1: seq=2 ttl=64 time=0.213 ms 64 bytes from 127.0.0.1: seq=3 ttl=64 time=0.214 ms 64 bytes from 127.0.0.1: seq=4 ttl=64 time=0.183 ms
      singulars
      1. POWhy is output of GPS using python zero or Nan?
      1. USla lluvia
    3. COI didn't know ping could do that, according to this SO question you can't specify ports for ping - http://serverfault.com/questions/309357/ping-a-specific-port
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      1. POWhy is output of GPS using python zero or Nan?
      1. USxuanji
 

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