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Taranis telemetry- what went wrong?

Discussion about Tx, Rx, Servo's, Batteries, Chargers, and all the other things we like to talk about..
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Nigel Argall
Posts: 152
Joined: 20 Mar 2015, 18:26
Location: Cornwall

Taranis telemetry- what went wrong?

Post by Nigel Argall »

Ok here is a sorry tale. I like to do quite long flights so recently flew my Grunau Baby for nearly an hour. Towards the end I had that horrible feeling we have all had where the model is suddenly not following instructions. To look on the bright side, the crash was on land, not sea so could have been worse. Post crash analysis shows a flat battery do here are the questions:
It was a Panasonic Enyloop 4.8v nmhi. After the crash it showed 4.1v but a mate with a decent battery checker put that on and it showed zero capacity. First question is what is the telemetry on the tx showing? I assumed (ha!) That 5 bars was good 4 ok but I'd have to worry at 1 or 2 bars. I am now wondering if 1 bar = 1 volt? So 5 is good, 4 is disaster? Can I actually get the voltage displayed
Second question is about electricity, my understanding of which is limited. I know v x a = watts which is the power. Analogous to a water pipe, volts is pressure and amps the capacity or charge, so a big wire (pipe) has less resistance and potentially more power. So... if capacity of battery is zero how do I still have 4 volts?
Finally, is it possible to get a battery checker to avoid this again? Any recommendations?? Any advice gladly received.
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Barry_Cole
Posts: 1473
Joined: 10 Mar 2015, 09:30
Location: Hampshire UK

Re: Taranis telemetry- what went wrong?

Post by Barry_Cole »

Nigel,
I doubt those bars mean anything much, but you can show the actual Rx battery voltage very simply and set warnings.

modelgliding@aol.com

get in touch and I can sort you out.

BC
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mjcp
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Location: A wind swept hill with no wind, in driving distance of Windsor, UK
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Re: Taranis telemetry- what went wrong?

Post by mjcp »

There is a process to calibrate the Taranis / battery telemetry.

https://www.youtube.com/watch?v=JTTqfgbWLPE
m̶j̶c̶p̶ Marc

Hanger -
Some (now) pristine models that are un-flown for a year.
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Barry_Cole
Posts: 1473
Joined: 10 Mar 2015, 09:30
Location: Hampshire UK

Re: Taranis telemetry- what went wrong?

Post by Barry_Cole »

mjcp wrote: 17 Aug 2021, 13:29 There is a process to calibrate the Taranis / battery telemetry.

https://www.youtube.com/watch?v=JTTqfgbWLPE
That's not too much help, as it is the Tx battery that he is setting, plus he has not measured the voltage under load.

:? :? :? :?

BC
John Mcnamara
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Joined: 19 Mar 2015, 15:43
Location: Leeds
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Re: Taranis telemetry- what went wrong?

Post by John Mcnamara »

Personally I would not rely on the telemetry to save your model. Start with a good battery supply system. I highly recommend NiMh technology...............
for TV remote controls. I do not recomend them for RC models. They have a high internal resistance and potentially they will let you down when you most need them. I do recommend LiFe and LiIon technologies, as well as using dual batteries. Carrying lead in the nose of your glider? How much current does it supply to your radio? So take out a chunk of church roof and repalce with a second battery!Remember to use diodes between the batteries. Now you have a suitable battery supply system for your model with battery redundancy. There is lots of how to information on this forum. When you have done that, figure out how to get a battery alarm on your Taranis.
John
Malcolm B
Posts: 18
Joined: 21 Nov 2017, 21:06
Location: Cornwall

Re: Taranis telemetry- what went wrong?

Post by Malcolm B »

Nigel sorry to hear of damage to your gorgeous Grunau.
Hopefully it will taste the St Agnes air again soon.
I vote for the Lithium battery suggestion as it seems easier to determine the available capacity remaining and the balancing nose weight may as well work for a living!
Malcolm
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