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#!/usr/bin/env python # # GrovePi Example for using the Grove GPS Module http://www.seeedstudio.com/depot/Grove-GPS-p-959.html?cPath=25_130 # # The GrovePi connects the Raspberry Pi and Grove sensors. You can learn more about GrovePi here: http://www.dexterindustries.com/GrovePi # # Have a question about this example? Ask on the forums here: http://www.dexterindustries.com/forum/?forum=grovepi # # LICENSE: # These files have been made available online through a [Creative Commons Attribution-ShareAlike 3.0](http://creativecommons.org/licenses/b$ # # History # ------------------------------------------------ # Author Date Comments # Karan 21 Aug 14 Initial Authoring

import serial, time import smbus import math import RPi.GPIO as GPIO import struct import sys

ser = serial.Serial('/dev/ttyAMA0', 9600, timeout = 0) #Open the serial port at 9600 baud ser.flush()

class GPS: #The GPS module used is a Grove GPS module http://www.seeedstudio.com/depot/Grove-GPS-p-959.html inp=[] # Refer to SIM28 NMEA spec file http://www.seeedstudio.com/wiki/images/a/a0/SIM28_DATA_File.zip GGA=[]

#Read data from the GPS
def read(self):
        while True:
                GPS.inp=ser.readline()
                if GPS.inp[:6] =='$GPGGA': # GGA data , packet 1, has all the data we need
                        break
                time.sleep(0.1)     #without the cmd program will crach
        try:
                ind=GPS.inp.index('$GPGGA',5,len(GPS.inp))      #Sometimes multiple GPS data packets come into the stream. Take the$
                GPS.inp=GPS.inp[ind:]
        except ValueError:
                print ""
        GPS.GGA=GPS.inp.split(",")      #Split the stream into individual parts
        return [GPS.GGA]

#Split the data into individual elements
def vals(self):
        time=GPS.GGA[1]
        lat=GPS.GGA[2]
        lat_ns=GPS.GGA[3]
        long=GPS.GGA[4]
        long_ew=GPS.GGA[5]
        fix=GPS.GGA[6]
        sats=GPS.GGA[7]
        alt=GPS.GGA[9]
        return [time,fix,sats,alt,lat,lat_ns,long,long_ew]