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Testing Ublox GPS Module

Purchased a couple of Ublox GPS M8N modules recently and thought they may have been faulty as my Ardunino Nano wasn’t receiving any data.

So I thought I would share how I tested my module, in case it’s of use for anyone else.

First you need to obtain a few items and download the Ublox software :-

Ublox GPS Module (I usUblox GPS Moduleed a M8N which is on a GPSV3 board for this test)

 

 

 

 

Serial to USB (I used a YP-05 FTDI Module)FTDI

 

 

 

Use Connector Wire to hook the GPS Module and FTDI board together. My GPS module works with both 3.3v and 5v, just ensure you send the right voltage.

Connect the VCC -> VCC  and GND -> GND  , then ensure TX –>   RX   and the RX -> TX
gpd-ftdi

Before I connect the USB cable I like to check in my Windows Device manager to see what is connected under the “ports (COM & LPT)” that way you should be able to identify what COM port your FTDI will be on.
After connecting the USB cable, i see the following appear. commportd This indicates that my FTDI will be connected to COM14.

If you don’t already have the UBlox U-Center software you will need to download and install it. Ublox – U-Center

commportucenLaunch U-Center and set the Port and Baud Rate via the Receiver Menu.

 

Usually the Baudrate is 9600 by default, but you may need to try other speeds if you don’t have any luck.

You may also need to change the GPS type under the generation menu.

Within U-Center you can enable various windows to show you the information coming out of the module. The simplest to understand appear under View – Docking Windows. Just enable some of them to confirm your getting data.

dockingucentr

If you have connected everything correctly you should start seeing some information appear.  You should see several satellites and their signal strength, you should also see a sat fix status.
Remember if you’re indoors, you may not get the best signal.

If no data is received, check your settings and connections.

This should allow for a basic test to confirm the GPS Module is working. Take care if your trying to change any settings on the module as you can alter the modules characteristics which may not suit your project.

 

 

 

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Launch video and data of OZHAB01

Here’s the video of OZHAB01 being launched from Barmedman  NSW as well as other data I have collated so far

Unfortunately I have not yet recovered the payload of OZHAB01 so I am unable to provide any of the on board collected data. However I do have some flight data that was collected via APRS and the RTTY transmitter which gives a good indication of the flight progress.
The APRS was being received by digipeaters around 1000m and continued to have contact until it burst about 31000m. APRS Google Earth KML OZHAB01

aprs-altitude
Elevation Profile
aprs-flight
Flight from Launch until bursting

The RTTY was decoded on my laptop as I chased the balloon and followed the same path as the APRS. I did loose signal a few times as it was climbing to its burst altitude. RAW KML of RTTY Flight for Google Earth

rtty-collected-data-kml

Post Flight thoughts for next time

  • Ensure I pack a highly directional antenna to locate the payload.
    • Something with variable attenuation would be great.
  • Use a weight instead of digital scales to determine correct lift and helium dosage.
    • The digital scales were difficult to read as the wind blew the balloon around, which lead to less helium in the balloon and a slower ascent.
  • Cut balloon away when approaching max altitude to ensure a cleaner descent.
    • As I haven’t recovered payload yet, I don’t know how much balloon was intact and this could have impeded the parachute
  • Don’t forget the tarp next time.
    • Blankets worked , but were too small
  • Improve my APRS decode.
    • APRS was decoding sporadically.
    • I didn’t have an app installed that would upload the APRS data to the web

Still tracking

Flight is taking a little longer then expected but trackers are still transmitting.  Phew Should be reaching bursting altitude soon.

I was getting concerned that it wasn’t going to make the predicted turn back west and keep heading towards the east. But it saw my mountain and decided to make a turn. 🙂

turning.JPG
Turning back at Mount David

5 mins , tracker online

Tracking OK, before launch, if I continue to have signal the map should update.
look for VK2HEK.

https://tracker.habhub.org
or, if APRS is working
http://aprs.fi/#!mt=roadmap&z=12&call=a%2FVK2HEK-9&timerange=3600&tail=3600

tracking.JPG

15min to launch of ozhab01

Longest 15mins ever. Trackers ready but am I. 

Launch preps underway

The launch preps are well underway.

Launch preps

OzHAB1 is Go for launch

After a long wait, the day has finally come where I hope to have a successful launch of my first ever Arduino based High Altitude Balloon project.

My launch approval has been granted through CASA and my NOTAM has been issued for Wednesday morning 9am / Tue 10pm UTC.

notam.jpg

The approval process was a lot easier than I had expected. I ensured that I provided all the information required from the regulations for a light balloon and the rest was easy.

I’m currently camped out at the launch site in Barmedman NSW where it must be at least 30 degrees C, so its going to be a hot night. Not going to make sleep easy when I’m rattling all the things of forgotten to bring through my head.

pred.JPG

The predicted flight looks straight forward and as long the transmitters hold out, I should get some good results.

I’ll have a APRS tx on 145.175 , and RTTY on 433Mhz.
As long as I have mobile reception I should be able to upload to https://tracker.habhub.org/  or http://aprs.fi

 

 

Its great to be on holidays

Well its certainly been sometime since I have posted to my Ozhab blog but work and family had taken priority. That doesn’t mean I haven’t been playing with my HAB project behind the scenes.  I was planning on launching

floods_3
Flooded Road, src NSW SES

sometime late last year, but parts of central NSW were under flood and I was worried that it may impact a safe launch and recovery operation. With many roads closed, it just wasn’t worth it. So I took the time to complete some other projects around the house before getting back on the HAB project.

Currently I’m on holidays so have a few days up my sleeve to really finish off this project and schedule a launch date. I don’t want to make any further major modifications and will just launch when I can.

I’ll be posting more updates as I go.

 

 

Balloon Ordered

Placed an order for a Totex 1500 Gram Balloon today. Looks like it will be coming from the states so I don’t expect to see it for a few weeks. But I will post more when it arrives.

You can purchase something similar via Amazon 30ft Dia. Weather Balloon, 1200 Grams

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