Datasheet

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)

try:

ind=GPS.inp.index('$GPGGA',5,len(GPS.inp)) #Sometimes multiple

GPS data packets come into the stream. Take the data only after the last

'$GPGGA' is seen

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]