Replies to This Discussion

3D RoboticsPermalink Reply by Chris Anderson on July 28, 2012 at 1:28pm

That may have been a power brownout, perhaps because you didn't use the second stage regulator?

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Permalink Reply by İlhan Başçuhadar on July 29, 2012 at 4:36am

It seems so Chris. If I use the second regulator despite of the heating problem, will there still be a possibility to have power brownout? What minimOSD does when heated a lot?

Also, I have never faced with brownout problem before whether I used seperate BEC or not. Just after installing minimOSD I have this problem. Was the initialising one APM1 or minimOSD? 

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Permalink Reply by Vernon Barry on July 29, 2012 at 5:00am

The part I never seem to understand is WHY put the minim OSD on the aircraft?

It can work from either side of the radio link for telemetry. It would seem FAR more logical to send a clean video feed to the ground and then add the telemetry info at the ground. This way, your nice video footage is also not cluttered with OSD. By putting the OSD in the aircraft you have no way of having a clean (non-OSD) video to the ground unless you use the camera to record it, and even then, you will only see that after you land.

 

If you are worried about power and EMI/RFI, why add more electronics in the aircraft, just keep the video and TX completely separate at the aircraft from the APM all together. This has been discussed before and yet here again, is another fine reason why to not put it in the aircraft. I just think the WIKI should be more clear and suggest this option. The OSD doesn't care where it gets Mavlink from.

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Permalink Reply by İlhan Başçuhadar on July 29, 2012 at 10:33am

It's a good idea to connect minimOSD to the GCS. Please make it more clear how to do this. I mean from where minimOSD will receive telemetry data? How will it be connected on the ground?  

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Permalink Reply by Leonardo Lisboa on July 29, 2012 at 11:18am

Hi Vernon, I use Minimosd in the plane only for the reason that I'm doing long range flights, so the video can reach 10Km, but telemetry not, so after around 2Km I would be out of telemetry.

Using Minimosd on the ground is a good idea, but only works fine for short/medium range.

Regards,

Leonardo

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Permalink Reply by İlhan Başçuhadar on July 28, 2012 at 1:52pm

Here is the link of the video

 

http://www.youtube.com/watch?v=cZIpGty8VRM&feature=youtu.be

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Permalink Reply by Leonardo Lisboa on July 28, 2012 at 6:10pm

Hi, it really looks like a brownout. It happened to me three times in the past. Too much electronics for an ESC BEC. Are you powering your ardupilot with a separate BEC? If not, please do it.

Hope it helps.

Regards,
Leonardo

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Permalink Reply by İlhan Başçuhadar on July 29, 2012 at 4:25am

I had been using a seperate BEC till I changed my current sensor from RV to Attopilot a couple of weeks ago. I couldn't get 12V supply for the seperate BEC (as I used to do for older setup) from the center pin of Attopilot. So, I left using seperate BEC to the future.

On the other hand, I have been flying without a seperate BEC for a couple of weeks without any problem. Only difference of the yesterday's crash from the previous nonproblematic flights was adding minimOSD. And yesterday minimOSD went into "initialising" state, APM1 didn't! Does initialising of minimOSD cause rc link lost because I couldn't save the plane whatever I did, changed mode to manual, pulled up elevator, give throttle...!

Anyway, I will use seperate BEC as before from now on. Thanks Leonardo for your comment.

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Permalink Reply by İlhan Başçuhadar on July 29, 2012 at 11:31am

Leonardo, if I use a seperate BEC on the airplane, do I still need to power the second regulator of minimOSD? MinimOSD heats a lot when second reg powered seperately. I use v1.0.

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Permalink Reply by İlhan Başçuhadar on July 29, 2012 at 4:48am

Lessons leraned;

1. Always use a seperate BEC without question.

2. Use the second regulator of minimOSD as it decreases the risk of power brownout.

3. If you use the second regulator find a way of cooling the minimOSD even if it is V1.0.

4. If minimOSD goes into initialising state in the air, you have nothing to do prevent a crash.

5. Soldering the PAL jumper on minimOSD does not guarantee the default setting change into PAL. Gabor's code guarantees this.

 

If you have any comments on my lessons learned please let me and other potential minimOSD users know. 

 

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Permalink Reply by mack goodman on August 25, 2012 at 3:03pm

My minimosd has the solder jumpers in to power the osd from the APM2.. I don't put any power on the osd for video, just video control wire and a ground..

Do you think this is risky?  I just had a brownout death spiral exactly like you yesterday,, also first time I was flying with the oSD.. but I was not using a separate BEC for the APM2 which I a certain now was part of the problem..

Anyway, what do you think about my setup now?

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Permalink Reply by İlhan Başçuhadar on August 26, 2012 at 3:25pm

Mack, after the crash I have been experimenting this setup for a couple of weeks:

MinimOSD is powered by APM, but I supply APM by a seperate BEC which is powered by the main battery. This battery also powers the brushless motor.

I supply the second regulator of minimOSD (analog side) by a seperate battery together with my camera and tx in order to have clear video. This way, minimOSD gets very hot, but air coming from the clearance between my fuselage and the wing flows over it so that I haven't experienced any problem for a couple of weeks.

Also Eddie's way of supplying minimOSD, according to me, results in more clear video. I recommend you to consider Eddie's config either.

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