M4 - what is it, what can it do?

Info and discussion about the autonomous Micro FC, suitable for nanos, micros and mini multirotors

Re: M4 - what is it, what can it do?

Postby axelnied » Fri Feb 13, 2015 6:39 pm

I am setting up the M4 and was working on the GPS... I have the 15db 10mm Taoglas, where I replaced the (very) short u.fl connector with a longer cable to be able to mount it somewhere useful. I carefully tested signal and ground connections, so I am fairly confident I didn't screw anything up.

Unfortunately it can not get a lock with the GPS. I used the 35mm version from the AQ6 and it aquired a 3d fix within 20sec. So the M4 is working ok.

Q1: I replacing the cable an issue?
Q2: How can I test if the Taoglas is working to find out a potential issue with the HW?
Q3: Are there specific software settings i can change (baud rate) to promote a lock?

Any advice is appreciated...
Axel
axelnied
 
Posts: 262
Joined: Wed Jul 04, 2012 5:51 pm
Location: San Diego, CA, USA

Re: M4 - what is it, what can it do?

Postby aBUGSworstnightmare » Fri Feb 13, 2015 7:07 pm

axelnied wrote:Q1: I replacing the cable an issue?

Can be a little tricky since the isolation of the coax tends to meld quite easy. This can result in a short circuit between GND and GPS signal.

axelnied wrote:Q2: How can I test if the Taoglas is working to find out a potential issue with the HW?
Q3: Are there specific software settings i can change (baud rate) to promote a lock?

Download and install uBLOX uCENTER GNNS software - https://www.u-blox.com/en/evaluation-so ... enter.html.
Connect to the USB COM port at 1200 baud (tells the M4 that you want to speak directly to the GPS.) Turn on the NAV_SAT messages and you will get a graphic representation of satellites received, strengths and positions. GPS type is ublox8 for the M4r6 V2 production boards and uBlox7 for the BETA boards.
ucenter.png
uBlox u-Center connected directly to M4r5 (@1200baud, ublox7 series)
aBUGSworstnightmare
 
Posts: 1460
Joined: Fri Jun 22, 2012 5:24 pm

Re: M4 - what is it, what can it do?

Postby axelnied » Fri Feb 13, 2015 7:29 pm

Thanks for explaining, I was wondering how to connect the GPS to the u-blox software... I will test and report back.
axelnied
 
Posts: 262
Joined: Wed Jul 04, 2012 5:51 pm
Location: San Diego, CA, USA

Re: M4 - what is it, what can it do?

Postby kinderkram » Sat Feb 14, 2015 1:04 am

Hmmm, the info about the UBlox tool is 3 times in the Wiki.
Made it even more prominent now...
kinderkram
 
Posts: 2911
Joined: Fri Jun 22, 2012 7:47 am

Re: M4 - what is it, what can it do?

Postby axelnied » Tue Feb 17, 2015 6:31 pm

I was able to connect the M4v2 to the uBlox tool. While the 35mm GPS delivered instant communication, the 10mm Taoglas had issues receiving hardly anything.

I believe the G1, G2, G3's are the GPS (US), while the R? are the GLASNOSS (there was a Russian Flag next to it :o ). The Taoglass (with my extended u.fl cable) only occasionally received signals on R?, and never on any of the G-satellites. I waited and observed for about 30minutes. No Lock was available...

While I carefully tested for "short" signal to ground, on the cable itself, but I also tested the connection (continuity) from the u-Blox pins to the solder-points on the Taoglas. All seemed fine. I will unsolder the bottom plate again and see if I can provide some images. If anyone has some more testing procedures?

Norbert,

Well the thing is, if you don't know about such tool, you won't look for it ;-)

Axel
axelnied
 
Posts: 262
Joined: Wed Jul 04, 2012 5:51 pm
Location: San Diego, CA, USA

Re: M4 - what is it, what can it do?

Postby Kisssys » Tue Feb 17, 2015 7:34 pm

Did the patch work before changing the cable?

Try it without the shield in place.
Steve
Kisssys
Kisssys
 
Posts: 1340
Joined: Sat Jun 23, 2012 9:23 pm

Re: M4 - what is it, what can it do?

Postby axelnied » Tue Feb 17, 2015 7:53 pm

THAT would have been a very smart idea, that I did not think of...! :shock:
Unfortunately I did not test the patch prior to resoldering it! I know, kinda stupid...
Well, good for Jussi, since another order coming his way...
axelnied
 
Posts: 262
Joined: Wed Jul 04, 2012 5:51 pm
Location: San Diego, CA, USA

Re: M4 - what is it, what can it do?

Postby Kisssys » Tue Feb 17, 2015 8:48 pm

Bummer, I've changed the cable on a number of them for the same reason. I'm successful most of the time but I have a couple that look fine but don't work even after multiple try's. Thats' with all sizes by the way.
Last edited by Kisssys on Wed Feb 18, 2015 3:01 pm, edited 1 time in total.
Steve
Kisssys
Kisssys
 
Posts: 1340
Joined: Sat Jun 23, 2012 9:23 pm

Re: M4 - what is it, what can it do?

Postby aBUGSworstnightmare » Wed Feb 18, 2015 6:39 am

axelnied wrote:The Taoglass (with my extended u.fl cable) only occasionally received signals on R?, and never on any of the G-satellites.

Are you sure this is a GNNS antenna? You can't receive GLONASS sats with a GPS only antenna. Pls post the Taoglas part no. of that antenna.
aBUGSworstnightmare
 
Posts: 1460
Joined: Fri Jun 22, 2012 5:24 pm

Re: M4 - what is it, what can it do?

Postby axelnied » Wed Feb 18, 2015 9:24 am

aBUGSworstnightmare wrote:
axelnied wrote:The Taoglass (with my extended u.fl cable) only occasionally received signals on R?, and never on any of the G-satellites.

Are you sure this is a GNNS antenna? You can't receive GLONASS sats with a GPS only antenna. Pls post the Taoglas part no. of that antenna.

I had ordered this from Jussi...:
https://viacopter.eu/multirotor-shop/autoquad-m4/gps-antenna-10mm,-15db-multicopter-store
On the top of the GPS "AP-10E" is printed on.
I attached a screenshot of the uBlox tool. Not sure if you can read it, but typically only "R?" appear with any signal. On the right side "R?" always shows with a Russian Flag. I am using 1200 baud and uBlox 8, all protocols.
Screen Shot 2015-02-18 at 24.09.17 .png
axelnied
 
Posts: 262
Joined: Wed Jul 04, 2012 5:51 pm
Location: San Diego, CA, USA

PreviousNext

Return to AutoQuad M4 Micro Controller

Who is online

Users browsing this forum: No registered users and 7 guests

cron