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Using the QuanumGPS as a Path Logger

Although the description for this product is wrong about recording a path, it is worth buying. It

conveniently records maximum flight speed and path length, which is worth the $50. But to record the

path requires you to spend about $25 more. You will need this:

OpenLog from Sparkfun: https://www.sparkfun.com/products/9530

OpenLog is the red thing on the

left. At the top is an R/C receiver

which can be the source of 5V but

otherwise not needed to record

GPS path.

OpenLog is an Atmel 328

microcontroller on a circuit board

that is pre-wired and preloaded

with firmware that will take in the

signal from the QuanumGPS.

Nothing to program and only the

connector between them is

needed to be soldered up. (This is

detailed below).

On the back side of the OpenLog is a microSD card reader. (Enough for 320 thousand hours of flight

time, by the way.) Each time you unplug the OpenLog or each time you remove and replace the SD card

the OpenLog closes a file and opens another. When you move the SD card to a reader on your PC at

home, that SD card resembles a hard disk and you just move (or copy) files onto your PC.

This is what the files look like from the OpenLog:

LOG00059.TXT

LOG00060.TXT

LOG00061.TXT

Inside each file is something very readable:

$GPGSV,4,4,14,46,42,148,40,51,49,161,46*7C

$GPGLL,3352.85174,N,11756.45278,W,220116.00,A,D*78

$GPRMC,220117.00,A,3352.85174,N,11756.45282,W,0.045,,191015,,,D*69

$GPVTG,,T,,M,0.045,N,0.084,K,D*2B

$GPGGA,220117.00,3352.85174,N,11756.45282,W,2,12,0.83,69.3,M,-32.7,M,,0000*50

$GPGSA,A,3,46,51,29,15,27,24,18,22,16,21,20,14,1.52,0.83,1.27*0B

$GPGSV,4,1,14,10,38,306,34,14,20,188,29,15,35,053,39,16,18,268,18*79

$GPGSV,4,2,14,18,73,339,46,20,22,055,25,21,68,045,46,22,46,262,42*75

$GPGSV,4,3,14,24,08,109,27,26,13,240,,27,27,315,23,29,24,157,39*7A

$GPGSV,4,4,14,46,42,148,40,51,49,161,47*7D

$GPGLL,3352.85174,N,11756.45282,W,220117.00,A,D*7C

$GPRMC,220118.00,A,3352.85172,N,11756.45283,W,0.086,,191015,,,D*6E

$GPVTG,,T,,M,0.086,N,0.159,K,D*25

$GPGGA,220118.00,3352.85172,N,11756.45283,W,2,12,0.83,69.2,M,-32.7,M,,0000*59

$GPGSA,A,3,46,51,29,15,27,24,18,22,16,21,20,14,1.52,0.83,1.27*0B

This format is called NMEA and each line is a NMEA sentence. Most are redundant. The easiest one to

understand is $GPGGA. You can see N for north latitude and so on. The world of GPS software is huge,

as you can imagine, and much of it is available for the tinkerer. My favorite website for converting the

Summary of content (5 pages)

PAGE 1
Using the QuanumGPS as a Path Logger Although the description for this product is wrong about recording a path, it is worth buying. It conveniently records maximum flight speed and path length, which is worth the $50. But to record the path requires you to spend about $25 more. You will need this: OpenLog from Sparkfun: https://www.sparkfun.com/products/9530 OpenLog is the red thing on the left. At the top is an R/C receiver which can be the source of 5V but otherwise not needed to record GPS path.
PAGE 2
above .txt files to Google Earth view is GPSvisualizer: http://www.gpsvisualizer.com/map_input?form=googleearth&googleearth_trk_altitude=absolute Don’t be distracted by the ads. You drag your .txt file to the field that says “Browse…” Click on “Create KML File” and the web page will change screens and present to you a name like: 20151020112033-60253-map.kmz (dot kmz is merely the compressed form of a dot kml file.) It is good to memorize KML and KMZ as the files needed by Google Earth.
PAGE 3
Here is a small section of that website (the link above) . . . To show the path through the air, choose “Absolute (for flights)” in the Altitude mode: field. Wiring the Connector The QuanumGPS has an auxiliary connector that is of the type called microJST. This one is four conductor. I was only able to buy them ten at a time. Use these key words to find it in eBay: “Micro JST 1.25mm 4-Pin Connector Plug with Wires”.
PAGE 4
Running the QuanumGPS in Logging Mode The switches and the blue display make the QuanumGPS much handier than a µ-blox receiver purchased from eBay. After providing power and waiting the appropriate time for the unit to find the exact frequency of the satellites, a menu will be shown on the display. This should be very familiar to you if you have flown the QuanumGPS before. Make your way to menu item “PC Connect” and get ready to fly. Just before take off press “Enter”.
PAGE 5
Here is the QuanumGPS connected to the airborne XBee. Like the logger, the power for both can come from the QuanumGPS servo lead. The signal (and power) from the QuanumGPS going to the XBee is 5V and you will need an interface board for the XBee here also. In this case you won’t need the USB version, so it’s cheaper. https://www.sparkfun.com /products/11373.