Lemon Telemetry with ErSky9x

erskyTx runs on many radios and upgrade boards
ersky9x was a port of er9x for use on the sky9x board.
User avatar
mentero
Posts: 82
Joined: Sat Apr 23, 2016 1:11 pm
Country: Spain

Re: Lemon Telemetry with ErSky9x

Post by mentero » Fri Feb 01, 2019 8:29 pm

Hi,

Is it normal that nothing is heard if the Vario source value is less than 26 ?

Let me check if I understand this:
Vario source can vary from +1024 to -1024.

+256 - 256 seems like a reasonable input for Vario source, since the increase of number or beeps per second stops at a value of 200, even if the frequency of the beep itself continues to raise. (very, very uneducated guess).

A scaler SC1 = Vspd * 6 gives +240 -240 for a Vspd range of +4m/s to -4m/s. since Vspd is in dm.

Beeps are then heard at zero (?), and then silence up to a input value of 26. That is equivalent to 0.43m/s. Not a very good resolution in an area critical for low altitude thermal hunting.

Maybe I shall go up using a scaler of Vspd * 26 ? That will make beeps at 0.1m/s.

Some enlightment will be much appreciated.

Miguel

P.S, Note that all this is theoretical, the weather is too bad to go making airborne tests, that will probably solve the issue by ear.
We demand rigidly defined areas of doubt and uncertainty. Douglas Adams.


User avatar
MikeB
9x Developer
Posts: 16730
Joined: Tue Dec 27, 2011 1:24 pm
Country: -
Location: Poole, Dorset, UK

Re: Lemon Telemetry with ErSky9x

Post by MikeB » Fri Feb 01, 2019 11:16 pm

The FrSky vario sends the vspd in cm/s, although from my log files, it looks like it goes in steps of 50.
According to the code I just looked at, the DSM telemetry value is multiplied by ten, so is converted to cm/s.
Yes, vario tones start when the source value exceeds 25.
If sink tones are enabled, then tones are generated, spaced a long time apart, when vspd is zero.

A Scaler of vsdp * 6 should give a value of 60 when the telemetry value is 1 dm/s (1 * 10 for cm/s, then *6 in the Scaler).
Again this is theroretical! I don't have a Lemon vario, or Rx with built in vario.

Mike
erskyTx/er9x developer
The difficult we do immediately,
The impossible takes a little longer!

Daedalus66
Posts: 1839
Joined: Tue Dec 27, 2011 8:22 pm
Country: -
Location: Ottawa

Re: Lemon Telemetry with ErSky9x

Post by Daedalus66 » Sat Feb 02, 2019 3:59 am

Mike

Send me your postal address and I’ll send you a Lemon receiver with vario/altitude.

Nigel


Sent from my iPad using Tapatalk

User avatar
mentero
Posts: 82
Joined: Sat Apr 23, 2016 1:11 pm
Country: Spain

Re: Lemon Telemetry with ErSky9x

Post by mentero » Sat Feb 02, 2019 12:05 pm

Well,

thank you Daedalus for your offer to Mike. I am at least as happy as he is. Maybe more. :lol: :lol:

It seems that my arithmetic is out by a factor of 10. Not too bad, I have done worse than that.
We demand rigidly defined areas of doubt and uncertainty. Douglas Adams.

User avatar
MikeB
9x Developer
Posts: 16730
Joined: Tue Dec 27, 2011 1:24 pm
Country: -
Location: Poole, Dorset, UK

Re: Lemon Telemetry with ErSky9x

Post by MikeB » Sat Feb 02, 2019 11:06 pm

Nigel, PM sent.

Mike
erskyTx/er9x developer
The difficult we do immediately,
The impossible takes a little longer!


User avatar
MikeB
9x Developer
Posts: 16730
Joined: Tue Dec 27, 2011 1:24 pm
Country: -
Location: Poole, Dorset, UK

Re: Lemon Telemetry with ErSky9x

Post by MikeB » Mon Feb 25, 2019 12:41 pm

From an Issue on mbtx:
"In every 0x40 record, Lemon is sending down six different data for Vspd, that according to Spektrum documentation correspond to data filtered (averaged ?, differentiated ?) using a time constant of 250ms, 500ms, 1s, 1.5s, 2s and 3s, trading accuracy for delay.
The data with a 250ms filter shows a poor stability. Peaks can be as high as +/- 1m/s, with a standard deviation of 0.38.
If I understand the code right, this is what ersky9x is using in the processDsmPacket function in frsky.cpp

On the other hand, data filtered with 1s, shows a much better behaviour, (max peak at 0.4m/s, and stdev of 0.15) at the expense of the corresponding delay, that I suppose, (haven't tried that yet) less annoying than chirps showing very fast changes that are in fact not happening."

I have added an option, in the telemetry menu, to select which of the 6, filtered value to use for "vspd".
This is included the the "d4" test version I have just posted.

Mike
erskyTx/er9x developer
The difficult we do immediately,
The impossible takes a little longer!

User avatar
jhsa
Posts: 19209
Joined: Tue Dec 27, 2011 5:13 pm
Country: Germany

Re: Lemon Telemetry with ErSky9x

Post by jhsa » Mon Feb 25, 2019 1:14 pm

Is that only for the DSM telemetry? or does it also affect other protocols??

Thanks

João
My er9x/Ersky9x/eepskye Video Tutorials
https://www.youtube.com/playlist?list=PL5uJhoD7sAKidZmkhMpYpp_qcuIqJXhb9

Donate to Er9x/Ersky9x:
https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=YHX43JR3J7XGW

User avatar
mentero
Posts: 82
Joined: Sat Apr 23, 2016 1:11 pm
Country: Spain

Re: Lemon Telemetry with ErSky9x

Post by mentero » Mon Feb 25, 2019 4:13 pm

Thank you Mike,

The longer filters clearly improve the stability around zero.
Even with that, the correlation of sound and movement when moving the receiver by hand does not seem (to me) very good. I will try to make a video.

No time yet to try the new firmware on a plane.

Minor problem of "d4". I hear some hesitations (not every time) on the welcome message and on the "no telem-m-m-m-etry" message when the Rx or Tx is turned off.
(edited to add: This happens only if the receiver and tx are close together. Go figure.)

@João: Do not know for sure, but I believe this feature is DSM only.

Miguel
Last edited by mentero on Sat Mar 02, 2019 6:42 pm, edited 1 time in total.
We demand rigidly defined areas of doubt and uncertainty. Douglas Adams.

User avatar
mentero
Posts: 82
Joined: Sat Apr 23, 2016 1:11 pm
Country: Spain

Re: Lemon Telemetry with ErSky9x

Post by mentero » Tue Feb 26, 2019 2:26 pm

I recorded a short video to show what I am talking about;

This is the Lemon receiver with "d4" test release in 9XR-pro with Vspd (no scalers) as a source for vario and 0.250s selected. Sounds confusing to my ears.
Choosing 1s filter helps with peace of mind, because there are not so many chirps all over the place, but doesn´t help a lot in understanding in what sense and by what amount the Rx is moving.
Has anybody had better results ?. If so, how ?

DSMx_ersky9x.wmv
(9.39 MiB) Downloaded 24 times

Compare to what is heard in this video recorded with Lemon Rx and Taranis when the author raises the model at time 2.12
https://www.youtube.com/watch?v=E81HXNUkF_M

Miguel
We demand rigidly defined areas of doubt and uncertainty. Douglas Adams.

User avatar
mentero
Posts: 82
Joined: Sat Apr 23, 2016 1:11 pm
Country: Spain

Re: Lemon Telemetry with ErSky9x

Post by mentero » Fri Mar 08, 2019 11:48 am

After several days of flying with the Lemon vario, I have come up to the following setup, that is working for me.

If you want to use it as a starting point, this is how: (if you do, your comments will be appreciated)

Use ersky9x Version ersky9xProvR222d4 , dated 25-Feb-2019 or newer, found here:
viewtopic.php?t=4676

Choose Software volume in the Maintenance menu. If you don't, vario volume input will not change the volume of the tones.

Telemetry vario data is acquired in 0.1m/s steps, and stored internally in cm/s; therefore, 0.1m/s is stored as Vspd = 10
The first tone will be produced by ersky9x when Vario source = 25, therefore a scaler of 2.5 ( Vspd multiplied by 25, divided by 10) can be used
so that 0.1m/s rising makes the first noise.
If you prefer to use a scaler of 3, the first noise will be heard with Vspd = 0.083m/s, but that will not improve sensitivity.
Use an offset in the scaler screen if you prefer the first tone to be heard before of after 0.1m/s. I am still experimenting with that, for now it is set as zero.

Choose a filter (DSM Vario) of, at least, 1s. or greater. I use 1s or 1.5s depending on size and weight of the model.

I do not like sinking tones, unticked the case.
Tone frequencies are set as low as possible. -50 frequency,-20 offset.

I have also used a couple of logical values
L1 avoids the tones when Vspd <= 0. If not used, tones will be heard every two seconds if Vspd = 0. ELE switch is used to cut vario tones. (Review this if you tick sinking tones)
L2 avoids the tones when the throttle is up. (On electric gliders. Change if the throttle stick is used for brakes or spoilers).

Miguel
(edited: forgot to mention, I opened the receiver and put some very low density open cell foam over the sensor to avoid the air currents inside the fuselage. If you do, take care with the very tiny lugs at the corners.)

IMG_20190308_114221.jpg
IMG_20190308_114355.jpg
IMG_20190308_114420.jpg
IMG_20190308_114327.jpg
Last edited by mentero on Sun Mar 10, 2019 9:09 pm, edited 4 times in total.
We demand rigidly defined areas of doubt and uncertainty. Douglas Adams.

User avatar
bob195558
Posts: 2167
Joined: Sun Dec 16, 2012 7:24 pm
Country: United States
Location: New England, Vermont
Contact:

Re: Lemon Telemetry with ErSky9x

Post by bob195558 » Fri Mar 08, 2019 12:16 pm

home built 9xr pro.jpg
home built 9xr pro.jpg (31.98 KiB) Viewed 927 times
mentero wrote:
Thu Jan 24, 2019 5:33 pm
Oopss, sorry I haven't mentioned, :oops: my display is upside down because my radio has the "brains" of a 9XR-pro,
but is in a different case with better sticks, and the wiring was considerably cleaner with the display upside down.
Miguel

If I remember correctly, there may be an option to flip the screen image 180 in erSky9x.
I think it is in the hidden radio setup window.
Er9x on 9x radio, with Smartieparts Programmer and TelemetrEZ Board.
ErSky9x on Taranis, Sky9x, 9Xtreme radios.

Welcome to 3D-Printing: (https://openrcforums.com/forum/viewforum.php?f=129).

User avatar
mentero
Posts: 82
Joined: Sat Apr 23, 2016 1:11 pm
Country: Spain

Re: Lemon Telemetry with ErSky9x

Post by mentero » Fri Mar 08, 2019 12:29 pm

Yes, that is what I use.

Works perfect, except on the bootloader screen. The "problem" only appears if my eeprom is exported and read by a stock 9xr-pro.

Perfect for inverted flight. :D
Miguel
We demand rigidly defined areas of doubt and uncertainty. Douglas Adams.


Post Reply

Return to “erskyTx (was ersky9x)”