Search found 308 matches

by nigelsheffield
Fri Apr 29, 2016 2:07 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: GPS sensor
Replies: 418
Views: 33772

Re: GPS sensor

Aliexpress. Seller westerrc
by nigelsheffield
Fri Apr 29, 2016 12:44 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: GPS sensor
Replies: 418
Views: 33772

Re: GPS sensor

Just heads up , I just recieved another ublox7 GPS and wires were different, white and yellow for RX tx lines, and stiffer cheap feeling, also the antenna is smaller but it still got a lock in couple of minutes , I wonder if this is some refurbished item?
by nigelsheffield
Fri Apr 29, 2016 7:46 am
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: GPS sensor
Replies: 418
Views: 33772

Re: GPS sensor

Don't forget that when testing in your garden there are still things in the way, the small ublox7 only has a smaller antennae so won't be so sensitive, but when you are flying in the sky ABOVE all objects mine works just fine.
My advice is to try it in flight before giving up on it.
by nigelsheffield
Thu Apr 28, 2016 4:20 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: GPS sensor
Replies: 418
Views: 33772

Re: GPS sensor

Not tested for number of sats but in garden still takes a while for lock and it can lose it again, once down in flying field the lock still can take a few minutes on first connecting power but never loses it and locks right away on subsequent battery packs.
by nigelsheffield
Thu Apr 28, 2016 10:58 am
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: GPS sensor
Replies: 418
Views: 33772

Re: GPS sensor

Thanks for help @Kalle this is not the "problematic" one I`ll test U-Center later testet in and outside @ the window waitet 10 Minutes @nigel Blue Wire to 10k on Pin 6 ? Yes but I think I used a 6.8k as that was at hand. Testing at window did not always work for me, I needed to go outside away from...
by nigelsheffield
Thu Apr 28, 2016 7:19 am
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: GPS sensor
Replies: 418
Views: 33772

Re: GPS sensor

Sorry I missed his comments on the GPS lines uncommented, just trying to help of course and I have had a couple of people ask me why GPS is not working now and all it took was for them to go outside and wait for a lock.....
by nigelsheffield
Thu Apr 28, 2016 7:05 am
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: GPS sensor
Replies: 418
Views: 33772

Re: GPS sensor

He is using the exact same GPS as me so it should just work is its enabled gps in config file.
by nigelsheffield
Thu Apr 28, 2016 6:07 am
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: GPS sensor
Replies: 418
Views: 33772

Re: GPS sensor

GPS needs time to get a lock before sensors will be discovered, put it outside and leave it powered and connected to tx for at least 5 minutes maybe more.
Check config file that GPS is enabled.
by nigelsheffield
Mon Apr 25, 2016 12:01 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: GPS sensor
Replies: 418
Views: 33772

Re: GPS sensor

Right thanks, will try that next chance I get.
By noise I mean more probably from turbulence rather then sensor itself which is quite smooth.
by nigelsheffield
Mon Apr 25, 2016 9:15 am
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: GPS sensor
Replies: 418
Views: 33772

Re: GPS sensor

So smoothing less when there is a big change? But what if the big change is due to noise? I guess there is always a balance between what is perfect and what is practicle and your solution sounds best. But yes I think smoothing yaw every time it is available would be best and then transmitting the sm...
by nigelsheffield
Fri Apr 22, 2016 12:30 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: GPS sensor
Replies: 418
Views: 33772

Re: GPS sensor

bellow is another attempt at smoothing the yaw rate, seems to work, what do you think? I have not done the calculation for exact measurement based on the time sampling factor. cant test it out in air as my minimoa test glider crashed other day and is out of action for a while(maybe permanently). nee...
by nigelsheffield
Tue Apr 19, 2016 7:58 am
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: GPS sensor
Replies: 418
Views: 33772

Re: GPS sensor

Yes, so a large spike would not be smoothed particularly well.. If yaw is updated 50hz then smoothing that or calculating smoothed yaw from that at the rate it comes but only sending it 10hz might improve results somewhat. The other method would be to average the last 10 ? Or so results by adding th...
by nigelsheffield
Mon Apr 18, 2016 8:40 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: GPS sensor
Replies: 418
Views: 33772

Re: GPS sensor

Thanks , yes it's clear, i will have play with various smoothing values on all yaw pitch and roll to see what is good compromise between smooth and speed.
by nigelsheffield
Mon Apr 18, 2016 7:44 am
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: GPS sensor
Replies: 418
Views: 33772

Re: GPS sensor

Oh I see now, yes thanks for that! You mentioned that smoothing or filtering of the yaw pitch and roll could be done if needed, would the same smoothing formula be needed on those as the yaw rate you suggested? I think if those were filtered then the yaw rate might not need any filtering and react f...
by nigelsheffield
Sun Apr 17, 2016 6:38 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: GPS sensor
Replies: 418
Views: 33772

Re: GPS sensor

I see on github you put version with bug fixes for yaw rate, in particular changing sample rate to 200ms for yaw, etc, I just wondered why and if my results will be better or worse with the yaw rate calculation now?
Thanks.
by nigelsheffield
Thu Apr 14, 2016 6:34 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: GPS sensor
Replies: 418
Views: 33772

Re: GPS sensor

I found a solution to smoothing the yaw rate, this just ignores the wrong values and sends previous values. #if defined (VARIO) && defined (USE_6050) static int32_t previousYaw ; static uint32_t previousYawRateMillis ; uint32_t currentMillis ; currentMillis = millis() ; if (currentMillis >= previous...
by nigelsheffield
Thu Apr 14, 2016 12:38 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: GPS sensor
Replies: 418
Views: 33772

Re: GPS sensor

I flew a few times now with different methods of viewing the heading/yaw on taranis, In the end i found the best method was to just calibrate the yaw when new GPS data was available, and use yaw as heading in my script. The reason was in windy conditions the yaw alone could often be wrong by 90 degr...
by nigelsheffield
Tue Apr 12, 2016 1:15 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: GPS sensor
Replies: 418
Views: 33772

Re: GPS sensor

I've had to change the *100 part because of hub telemtry only alowing up to 30 in acc values compared with s.port which was happy with more.. I now multiply the acc values by 10 instead of 100 and then multiply them in the script by 10 and got rid of the *.1 in the yaw rate calculation. It still wor...
by nigelsheffield
Tue Apr 12, 2016 9:34 am
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: GPS sensor
Replies: 418
Views: 33772

Re: GPS sensor

Flew this morning and the yaw rate works great as an indication of roll, I tried just yaw rate on it own and it was a little laggy as an indication of roll and I tried both roll and yaw rate together added and this worked well with just a little overshoot but both methods are very useable all decidi...
by nigelsheffield
Mon Apr 11, 2016 11:49 am
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: GPS sensor
Replies: 418
Views: 33772

Re: GPS sensor

OK thanks, This is the first time I had the v.speed error and was circling very tight , I don't think it will be a problem in general. As for the yaw pitch and roll etc, it would be nice if they could be correct but not really important , I can probably get a good enough indication of pitch and roll...
by nigelsheffield
Mon Apr 11, 2016 8:27 am
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: GPS sensor
Replies: 418
Views: 33772

Re: GPS sensor

No I just used the + as in my post, the reason it works is the numbers are higher and have more data and so changing more often. This was the way you had it before more or less, I just altered the amount to multiply by to suit the fact that yaw is now 100 times greater in value. I don't think any sm...
by nigelsheffield
Sun Apr 10, 2016 7:10 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: GPS sensor
Replies: 418
Views: 33772

Re: GPS sensor

yes! much better now .. with the *100 in the line as you said and this if (currentMillis >= previousYawRateMillis + 100 ) { test1.value = (yaw.value - previousYaw) *0.05 ; // calculate yaw rate in degree / sec the results are perfect once I got rid of the *100 in my lua script, and the yaw itself is...
by nigelsheffield
Sun Apr 10, 2016 6:50 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: GPS sensor
Replies: 418
Views: 33772

Re: GPS sensor

the previous formula gives a nice smoothing effect obviously at the expense of reaction time. Unfortunately though it shows up the problem of crossing the south heading, each time it crosses south the horizon spins lol... I think I will try out the original version with no smoothing updating at 200m...
by nigelsheffield
Sun Apr 10, 2016 6:09 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: GPS sensor
Replies: 418
Views: 33772

Re: GPS sensor

Thanks , I will try it out and experiment with some different values.

Going back to the original 6050 arduino program ( the one with tea pot demo) I did a test and get decimal places from that , I presume you have done away with the decimal places for memory purposes?
by nigelsheffield
Sun Apr 10, 2016 1:18 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: GPS sensor
Replies: 418
Views: 33772

Re: GPS sensor

I tried this and it seems acceptable.
currentMillis = millis() ;
if (currentMillis >= previousYawRateMillis + 200 ) {
test1.value = (yaw.value - previousYaw) *5 ; // calculate yaw rate in degree / sec
by nigelsheffield
Sun Apr 10, 2016 1:06 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: GPS sensor
Replies: 418
Views: 33772

Re: GPS sensor

OK, I tried that, it works but is very jumpy, not precise enough, if I change to this currentMillis = millis() ; if (currentMillis >= previousYawRateMillis + 1000 ) { test1.value = (yaw.value - previousYaw) ; // calculate yaw rate in degree / sec precision is good and not jumpy but obviously slow up...
by nigelsheffield
Sun Apr 10, 2016 12:06 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: GPS sensor
Replies: 418
Views: 33772

Re: GPS sensor

Great thanks
by nigelsheffield
Sun Apr 10, 2016 11:17 am
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: GPS sensor
Replies: 418
Views: 33772

Re: GPS sensor

Thanks, Just tested on bench and it works, before I take apart plane to install I wondered if the update rate could be faster? Not a huge problem but would be nice if it was 10hz, I am not sure which I will use, but I have altered the script to allow either just yaw rate as roll or both roll and yaw...
by nigelsheffield
Sat Apr 09, 2016 6:55 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: GPS sensor
Replies: 418
Views: 33772

Re: GPS sensor

tried that version and still same.
I'll wait and see how you get on tomorrow.
Thanks.
by nigelsheffield
Sat Apr 09, 2016 2:41 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: GPS sensor
Replies: 418
Views: 33772

Re: GPS sensor

tested and something is wrong, I get altitude and v.speed going crazy, pitch roll and yaw all ok.
Yaw rate in test1 as T1 is zero when still, turning right it goes to 5000 or so , turning left it goes to huge numbers something like 2000000.

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