Quote from: Britishguy on Thursday,July 31, 2014, 22:44:42
thank you

de nada

There';s video';s on that link showing what you';re asking.  ::)

DYS Smart 3 Axis Gimbal - Demo using 3 channels for control

Watt? 

https://github.com/diydrones/ardupilot/issues/1251

QuoteThe bug is that when in AltHold mode, the altitude target is not being reset when the vehicle is landed and the pilot';s throttle is low. Instead it';s only set when you switch into AltHold mode. So what likely happened is the vehicle was disarmed, the pilot switched into AltHold mode. At that moment the altitude happened to be about 2.2m and so this was captured as the AltTarget. A little bit of time passed and the pilot then armed the copter (in AltHold Mode) -- this reset the current altitude estimate to zero but the desired estimate remained at 2.2m. Once the throttle was raised the vehicle immediately tried to attain the 2.2m. Even though the pilot had the throttle low, this was simply interpreted as meaning the pilot wanted the desired target (i.e. 2.2m) to be brought down. Sadly the target doesn';t come down as quickly as the vehicle goes up so you end up with the copter jumping into the air.

Quote from: Desmoboy on Tuesday,July 29, 2014, 11:53:59


This is my output

That';s not a "high" z reading, it';s the scale. You measure the vibes by subtracting the maximum lowest from the maximum highest. ie, you';d need to zoom into the graph more but I would guess you';ve got a high of 10.3 and a low of 9.7 so your z vibes is appx 0.6 and I';d guess that was due to a landing so can be safely ignored for flying purposes. ie, the rest of the graph looks like you have very low vibes to me. 

Quote from: Oakie on Thursday,July 24, 2014, 11:40:02 p.s. video is still 30 mins from finishing upload

Plus the time required to "process" it (if it';s not encoded to youtube';s liking)

I bought some four and six pin jobbies a while back, think I just searched for headers (as they';re popular for arduino boards). The headers can be unisex - it';s the crimps that determines the sex. It just means the male part sticks out proud 

Bork Sprung Derp Technique? 

This is just across the forest from me but it';s unfortunate;-

I don';t have insurance
Bournemouth Air Festival will be more attractive to me

Talking of the latter, I checked the Air Nav Order for the Festival but I couldn';t find the map deliminating the restricted area.

http://www.legislation.gov.uk/uksi/2014/1281/pdfs/uksi_20141281_en.pdf

QuoteRestricted
between 1200 hours and 2000 hours on 28th August 2014
between 1100 hours and 2000 hours on 29th and 30th August 2014, and
between 1100 hours and 1700 hours on 31st August 2014
no aircraft is to fly below 5,500 feet above mean sea level within the area bounded by straight lines joining successively the points referred to in paragraph (2).
(2)
The points mentioned in paragraph (1) are—
(a)504304N 0015636W,
(b)504405N 0014703W,
(c)504016N 0014604W,
(d)503914N 0015537W, and
(e)504304N 0015636W.

Quote from: DebianDave on Tuesday,July 15, 2014, 21:43:52 How long does a Mobius last on battery and does it give an on screen warning when low? Mines always been on charge when flying

I tested internal battery recording for over 1 30mins. I didn';t see a low battery warning on the recorded video but when outputting PAL to the VTX it was showing.

They';d get a great reception from me, that';s for sure 

I tried double-sided but the strips roll off it too easily, don';t think it';ll last like. Quick goodle research suggests UHU POR to be what I need for those bits, yeah. It might also do for the headstrap.

The monitor could, in theory be left unglued I guess. A larger screen (without it';s bezel) might be an upgrade in the future. I';m certainly not going to glue to the two mask halves together, posties rubber bands will do just fine though I got some rapstraps too. 

£21.41 and £16.04 respectively. Though I think prices also differ as to whether I';m logged in or not and even selecting different warehouses can make subtle price differences.

Went to jury rig the screen to my vRX and mobius complained of low battery but I did get a picture up. Mobius on charge now so looking at assembly.

What';s a good glue to use on these materials? I think it';s polystyrene body and typical foam bits, hard plastic (ABS?) screen, plus the elasticated headstrap (though they also provide metal screws which probably won';t hold/last long in polystyrene). 

Quote from: pheasant_plucker on Thursday,July 10, 2014, 16:15:08
HK Scorpion Y6 frame £21

Hard case 4S 5000 20c £15.25

You just have to don';t you 

Gerry

You must be a platinum customer or get some other discount. I get slightly different prices.

Mine arrived today (tracking number was bloody useless)

I won';t have time to assess them for a while, has anyone else got theirs and willing to report on initial findings?

Hats off to the cameraman not losing his nerve 

Up to 900 feet around some of the busiest private, government, military and commercial air routes/corridors, I don';t quite understand why he felt there was "..no risk of collision..." He must live in a bubble.

There was a news article recently about a Typhoon doing similar. Apparently, there';s nothing wrong with it.
http://www.youtube.com/watch?v=jojUQqJnvcU#ws

I';ve seen some low pass video';s but this has to be the lowest, short of actually landing (or crashing).

Extreme Low Pass

Quote from: Hands0n on Sunday,July 06, 2014, 16:39:54
I found this from Randy McCabe today. Although discussing Pixhawk his detailed comments suggest the issue may be wider and even extend into APM.

The APM internal compass has to be physically disconnected to allow an external one to be used so I don';t see how the APM can "fallover" automatically to the internal compass?

I have heard of mobius causing GPS interference if too close - it';s not unlikely vtx could be too, it';s what electrics does after all. These things though could and should be bench tested first.

What I would do; Setup outdoors without suspect/new devices powered and note Sat count. Power one device and recount Sats. This should be repeatable (if not, it';s intermittent) and if it';s causing degradation; invoking the reverse square law is just a matter of moving objects to other locations if possible. Then retest without flying until satisfied.

Quote from: TheEdge on Saturday,July 05, 2014, 18:40:48
Probably a difficult place for gps reception then, as also two other quads are low on gps count sometimes. When I was out there earlier today with the mobilephone, gps tester showed 24 sats in view and 7 in use..
We have quite a bit of mountains here in western part of Norway.. You see the place in the video in the first post.

Mountains don';t help but your phone sees over 20 satellites and uses more than your quad gps can see, so don';t know what to make of that shortcoming.

I also tried to interpret Thr_In vs Thr_Out data but none, except the first log, seemed to show any kind of correlation (though my analysis skills are sadly lacking).

Quote from: TheEdge on Saturday,July 05, 2014, 17:58:22
this side was pointing to the sky during the flight when it crashed, isn';t that right?
I linked to the other picture because that showed the mount and placement on the quadcopter, but I just did not have a picture of it after I flipped the unit as I wrote. Sorry for the confusing picture.

The dial was used with channel 6 tuning, but that was with the crius board. The gear switch changed values in chanel 7.
I have disconnected the receiver since the crash, so I cannot verify.

Yes, GPS as in second picture. So why low sat visibility.... Did it have horizon to horizon view (above everything)?

Quote from: TheEdge on Saturday,July 05, 2014, 17:11:54 If I lost 3d fix during loiter, would that explain the crash? I mean, would no 3dfix in loiter keep the qudcopter from rising when I apply full throttle?

Chanel 7 is not unused I guess as the gear switch manipulates chanel 7

The intricacies of APM still mostly alude me. I do know that in GPS-reliant modes, the throttle has a deadband set around the middle and manual throttle input has to be made at the more extreme ends of TX stick travel. I haven';t examined the logs for attitude yet, I';m not too up on it but can give it a go.

Channel 7 appears to be enabled throught the Hov Thro dial. The gear switch is right next to it, could it be that while flicking the switch you maybe brushed the dial at the same time? You can retest which is actuating Channel 7 if unsure.

Quote from: TheEdge on Saturday,July 05, 2014, 17:11:54

The stand for the gps broke off due to my frustration after the crash, so it is currently not mounted and I do not have a picture of the way it was mounted during that flight.
But this picture show how it was mounted, except that I flipped the compass/gps unit sideways so that the gps is on top like it is supposed to be.

Well, the GPS is upside so that sorts the low sat count /high HDOP problem. The antenna (which is on the other side) wants to be looking at the sky, not the controller chip

brb

Pretty much the same for the other two logs, low Sat count and too high HDOP. How is your GPS mounted and do you wait for it to get updated data or just arm once you get a 3D fix?

I';m working my way back from the crashlanding log. The previous is also showing 5 (at most) Sats and a slightly better but far from ideal HDOP of just under 3

Also notice this

22/06/2014 16:24:53 - 010729: THROTTLE ERROR: Throttle dropped below FS_THR_VALUE meaning likely loss of contact between RX/TX.
22/06/2014 16:24:53 - 010729: THROTTLE ERROR: Current Distance from Launch is 18.58m ~ 60.95ft
22/06/2014 16:24:53 - 010729: THROTTLE ERROR: Current Direction of UAV is 131 degrees (0 = north).
22/06/2014 16:25:08 - 011300: THROTTLE ERROR: Throttle error resolve meaning likely RX/TX contact restored.

Sorry, just got back from an errand, I';ll work my back through the logs (from crashlanding one) and see if the Sat stuff is different.

No worries about Ch7 if it';s unused. It';s just showing as flipping between two ranges (low and normal) so guess the dial is sitting just on the cusp.

brb

Quote from: TheEdge on Saturday,July 05, 2014, 13:38:31
Thank you for reading the log. I have not found a good way of reading the logs yet.
Yes, I disabled the prearm checks just to get started, cause I was doing the initial tests inside and had trouble getting gps lock inside, so I turned it of to be able to arm it for testing. Forgot to reenable it.

We(several quadcopter pilots here) have had some issues with the number of usable gps. So since I was in loitermode  both times I crashed, it might be gps related. Have just never had something like this happened before, so it might also have something to do with the fact that I mounted my mobius camera and a vtx just before the flight. Before this the thing was flying very nice, so I thought I was finally ready to go fpv with it.

I am not sure about channel 7 but I have the Turnigy 9x set up with a progmix that combines a 2 and a 3 way switch to give me 6 flightmodes. Flightmodes is connected to channel 5 but I noticed that I was not able to make use of all 6 positions untill I connected a cable from the receiver to channel 7. When I flick one of the flightmode switches, the value of channel 7 changes. Does the activity of channel 7 you question correspond with the change of flightmodes?
Or maybe it could be that either the camera or the vtx creates some disturbance on channel 7..

I have not fully understood the way the progmix of the turnigy 9x is working, so I might have done something strange there.  I was hoping that the progmix would need only channel 5 for all 6 flightmodes so that I could use channel 6,7 and 8 for other things, but I might have it set up wrong.

The receiver is not currently connected, so I am not sure exactly how I had it connected and what went to channel 7.

Out of the logs in your zip attachment, are any of them prior to adding the camera and vtx? If you can pinpoint one, I can compare SatCount and HDOP.

I';m still learning T9X settings but if you go into the menu you can see which additional channels (5-9) are enabled and what they';re assigned to. I don';t know how to work it out (or hazard a guess) from the logs, tbh.

Sorry I';ve not read the thread for details but I can run through the log for you.

From an APM perspective (megapirate might do things different by default)...

The crashlandings log...

Pre-Arm checks are disabled. (not advisable)

Only 5 sats and high HDOP (3.2-5.6) reported.

While this probably doesn';t help pinpoint the cause of your crashes, they are worth noting and fixing as a matter of course.

ETA: Do you have anything commanded through Channel 7? I notice it cycles rapidly between "normal" and "low" occasionally.