Taranis speaking wrong voltage

[zeratul]

I finally got telemetry working for my x4rsb RX byt using the frsky FLVSS... So get each cell readings on the small screen.


I';ve set my taranis to speak the voltage below 3.6v (a<x  cell  3.6) via the special functions. But it speaks 3.1volts when it';s actually 3.6volts.


Is there a reason for this and how can I change it to be accurate.

[gb0wers]

How are you determining the "Actual" cell voltage? Is 3.6V the value you can see on the FLVSS, the value you see on the Taranis or what you are measuring on a separate instrument, e.g. DVM?

Graham

[zeratul]

Hi Graham. The voltage that the FLVSS is telling me and what is being displayed on the Telemetry screen in Cells/Cell. I would have thought that the taranis would be speaking the information it was receiving from this info, but its a lot lower. If not - where is it getting the voltage from?

[gb0wers]

Can';t fault your logic zeratul. I,m going to tell you how it works on my setup with a Taranis plus running the as supplied firmware opentx-x9dp-v2.0.9.2

The Special Function makes the annunciation, but the annunciation is initiated by a  Logical Switch. They say a picture tells a thousand words, here';s hoping the attachments work.

[attach=1]
Logical Switch L1 detects when a Cell is less than 3.7V.


Special Functions SF 3 and SF4 are initiated by L1, and play the "Siren" and "Low Batt" sounds. This is what I usually fly.
I just added SF10. it too is initiated by L1 and correctly plays the Value, Cell.

Hope this helps. If not, I suggest you post images that show how you have it set up. So far my taranis has always done what I';ve told it to, but I have had difficulty in giving it meaningful instructions............

Graham

[zeratul]

Appreciate your time on this bg0wers :)


Here are my Logical Switches:
[attach=1]
Just looking at L1 here...


Here are my Special Functions:
[attach=2]
I did have SF7 for the L2 Switch but deleted that until I get this sorted!


Now... I posted on the Taranis Facebook page and it seems that the voltage is still taken from the FC (Flip32) even though the FLVSS is not connected to it... the FLVSS was the only way I could get the cell voltage to show on the Taranis screen using the X4RSB.


If that is the case I just need to change the config tab under vbat voltage scale. I can';t see why the taranis is reading from this as I couldn';t get telemetry from it at all without the FLVSS!

[annikk.exe]

I don';t think "Cell" is the voltage you should be reading.. that is just a guesstimate made by the Taranis based on the total voltage it';s seeing, plus some other factors.  I tried to use "Cell" on my Taranis initially but I just couldn';t get it to accurately report the voltage.  I tried "Cels" too, with similar results.
What worked for me in the end was using "VFAS" instead.

I would suggest trying to switch to VFAS and see if this works better.



On a related sidenote, a cool trick to combat the effects of voltage sag is to add a timer to your logical switches.  The right-most column is the "delay" - the conditions of the switch must be fulfilled for the duration of the delay before the switch becomes True.

If you add a 5 second delay to the "voltage low" switches, it stops the radio from nagging you if you briefly sag below the threshold while gunning the throttle.

I find this helps to stop the radio nagging me until the battery really is low. :>

[kilby]

I don';t think "Cell" is the voltage you should be reading.. that is just a guesstimate made by the Taranis based on the total voltage it';s seeing, plus some other factors.  I tried to use "Cell" on my Taranis initially but I just couldn';t get it to accurately report the voltage.  I tried "Cels" too, with similar results.
What worked for me in the end was using "VFAS" instead.

I would suggest trying to switch to VFAS and see if this works better.

From memory VFAS Vs Cels is dependant on the OpenTX revision (which is hugely irritating)

[gb0wers]

Well zeratul, it doesn';t make sense to me. I';ve just joined the Taranis group and whilst I understand all of the words in the replies, I don';t understand the message.............
I';m using a KK2.1.5 board so have no knowledge of the Flip32.

I have a couple more suggestions that may yield some clues.

First, add another SpecialFunction that does not depend on any logical switches, but uses a physical switch instead, I usually use the momentary switch SH for this.
SFx  SH (downarrow) Play Value  Cell

Then see if the Cell value spoken makes sense.

The only other thought I had was that when a Logic Switch is tripped, its name (e.g. L1) goes bold in the SF screen, like Switch F in the pic in your post. That would give you an indication, or otherwise, that the spoken value you are hearing is an fact an outcome of what you have set up.

Graham

[zeratul]

Thanks Graham - I';ll have a play this evening.

[zeratul]

I don';t think "Cell" is the voltage you should be reading.. that is just a guesstimate made by the Taranis based on the total voltage it';s seeing, plus some other factors.  I tried to use "Cell" on my Taranis initially but I just couldn';t get it to accurately report the voltage.  I tried "Cels" too, with similar results.
What worked for me in the end was using "VFAS" instead.

I would suggest trying to switch to VFAS and see if this works better.

[/size]OK - I tried using the VFAS setting but it just shows 0:[size=78%]
[attach=1]


Am I missing something - or should I be setting some VFAS elsewhere?

[annikk.exe]

Hrm... nope, it looks like "Cells" is the one you need on that particular setup.

Looking at your other screenshots, I note you have it set up to play the value for "Cell", which is different from "Cells".  Perhaps try changing the target of the Logical Switch?

[zeratul]

Hrm... nope, it looks like "Cells" is the one you need on that particular setup.

Looking at your other screenshots, I note you have it set up to play the value for "Cell", which is different from "Cells".  Perhaps try changing the target of the Logical Switch?

This was with the Logical switch from Cell to vfas, but hadn';t shown a image of that.


On a side note: The only leads going to the FC is the sbus lead from the X4RSB into channel 1... so can';t see if there should be anything to setup in cleanflight.

[annikk.exe]

This was with the Logical switch from Cell to vfas, but hadn';t shown a image of that.


On a side note: The only leads going to the FC is the sbus lead from the X4RSB into channel 1... so can';t see if there should be anything to setup in cleanflight.

You';re seeing the correct voltage on your radio';s display, so it';s clearly something misconfigured on the Taranis that is causing it to read out the incorrect thing.

I';m not sure what you mean by your first statement.  I meant to try changing "Cell" to "Cels" on the Logical Switch target.

[zeratul]

I';m not sure what you mean by your first statement.  I meant to try changing "Cell" to "Cels" on the Logical Switch target.

Sorry - I meant I had also changed the logical switch to vfas from cell (i.e. a<x  vfas  3.6v)

I know if I change the cell to cels it will just give a voltage of .5 less too (i.e. 11.1v when the screen read 11.6v).

[annikk.exe]

Okay, just had a look on my own Taranis and there is a "Cell", a "Cells" and a "Cels"

Have you tried all these of these?  One would think "Cells" would be correct, since this is what you have selected on the telemetry screen (and seems to be reading it correctly)

[zeratul]

I had a look and the only Cels i could find on the Logical switch or telemetry pages is ';Cels-'; which seems to give the same results as Cells.

Only think I can think of is its getting the telemetry via the SBUS lead and not the FRSKY Telemetry FLVSS - so will need to mess with the vbat voltage scale.

[kilby]

You do realise that you need to calibrate the transmitter to display the Cels value correctly

[zeratul]

No. I guess I';m asking how i would calibrate the Taranis to read the correct voltage.

[Elmattbo]

Trying to figure out this exact same issue so I';m watching with interest!

[quadfather]

What version of OpenTX are you running on your Taraniseses?

[zeratul]

Resolved :)

OK - I updated the OpenTX firmware to 2.1.1

Theres a load of extra tweeking that can be done for all the types of telemetry including creating a ';cell'; version that can be adjusted to match your voltmeter.

I appreciate everyones help and suggestions and must apologies as I wasn';t aware it was simply becuase I wasn';t using the latest FW.

[quadfather]

Resolved :)

OK - I updated the OpenTX firmware to 2.1.1

Theres a load of extra tweeking that can be done for all the types of telemetry including creating a ';cell'; version that can be adjusted to match your voltmeter.

I appreciate everyones help and suggestions and must apologies as I wasn';t aware it was simply becuase I wasn';t using the latest FW.

Good man, I was going to suggest just that!  It';s a lot easier to set up telemetry with v2.1.1 now, although different than before.

You can manually add sensors to get more information out of the FLVSS, such as lowest cell voltage, delta and individual cell voltages.

If you';re interested in that I did a quick post how to do it here http://www.multi-rotor.co.uk/index.php?topic=14768.msg132130#msg132130

Glad you got it sorted.

[Elmattbo]

I';m glad you got it sorted too! Thanks QF, I will also check that post.