GPSlog.py

#Author: Parth Parikh
#Distributed under MIT license

import serial
import pynmea2
import datetime
from dateutil import tz

LOG_FILE = datetime.datetime.now().strftime('%d_%m_%Y_%H_%M_%S')+"_gps_log.csv"
LOG_FILE_RAWPACKET = datetime.datetime.now().strftime('%d_%m_%Y_%H_%M_%S')+"_gps_raw_log.txt"

BAUD = 9600

def get_checksum(data):
	j = ord(data[0])
	for i in data[1:]:
		j ^= ord(i)
	return j

def available_ports():
	ports =['COM%s'%(i+1) for i in range(256)]
	result = []
	for port in ports:
		try:
			s = serial.Serial(port)
			s.close()
			result.append(port)
		except (OSError, serial.SerialException):
			pass
	return result


if __name__ == "__main__":
	portList = available_ports()
	i = 1
	for port in portList:
		print(str(i) +')'+port)
		i+=1
	print("0)Exit")

	selectedPortId = raw_input("SelectPort:")
	if(selectedPortId == "0"):
		exit()
	try:
		i = int(selectedPortId)
		selectedPort = portList[i-1]
	except Exception,e:
		print("Wrong Input!!!!!!!!!!!!!!!")
		raise e
	try:
		interface = serial.Serial(selectedPort,BAUD)
	except Exception, e:
		raise e
	
	fp_log = open(LOG_FILE,"w")
	fp_log.write("writing_datetime,reading_datetime,latitude,longitude,speed\n")
	fp_log.close()
	csv_dict = {}

	while True:
		rawPacket = interface.readline()
		print(rawPacket)

		fp_rawpacket = open(LOG_FILE_RAWPACKET,"a")
		fp_rawpacket.write("["+datetime.datetime.now().strftime('%d-%m-%Y %H:%M:%S')+"]:"+rawPacket)
		fp_rawpacket.close()
		try:
			parsedPacket =  pynmea2.parse(rawPacket)

			if(parsedPacket.sentence_type == 'RMC' and parsedPacket.status =='A'):
				csv_dict['latitude'] = parsedPacket.latitude	#float
				csv_dict['longitude']	= parsedPacket.longitude	#float
				csv_dict['reading_datetime'] = parsedPacket.datetime.replace(tzinfo=tz.tzutc()).astimezone(tz.tzlocal()).strftime("%d-%m-%Y %H:%M:%S")	#string
				csv_dict['writing_datetime'] = datetime.datetime.now().strftime('%d-%m-%Y %H:%M:%S')
				csv_dict['speed'] = parsedPacket.spd_over_grnd	#float

				fp_log = open(LOG_FILE,"a")
				csv_string = "%s,%s,%s,%s,%s\n" % (csv_dict['writing_datetime'],csv_dict['reading_datetime'],csv_dict['latitude'],csv_dict['longitude'],csv_dict['speed'])
				print(csv_string)
				fp_log.write(csv_string)
				fp_log.close()
			pass
		except Exception, e:
			pass