ExpressLRS telemetry explained

Рет қаралды 14,887

Күн бұрын

Huge thanks to Simion for helping with this video!
www.expresslrs.org/3.0/info/t...
www.expresslrs.org/3.0/quick-...
Time codes:
0:00 Intro and scope of the video
2:15 ExpressLRS telemetry NORMAL, RACE, LINK and DATA explained
5:14 How ELRS Telemetry Ratio Works
8:11 How changing the telemetry radio changes the time you wait for a telemetry packet
10:00 Ardupilot setup tips for ELRS telemetry
11:21 LUA Telemetry Script setup tips (inc. experimental mode in Yaapu for ELRS)
13:33 Summary
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Пікірлер: 55

@litterbug4023 Жыл бұрын

Just jumped on ELRS and ran into this exact thing on my first use case with ArduPilot! As always, awesome job keeping us informed on all the latest!

@deadbyteDrones Жыл бұрын

Way to go, Simion! For most users, Std (Standard) Telemetry Ratio would suffice (it'll adjust depending on what RF Mode or Packet Rate you're using, to ensure you have sufficient update rate for your telemetry without sacrificing your RC Packet send rate) There's Race Telemetry mode for Racers, which stops Telemetry sending once you're armed, maximizing the entirety of the packets for control. Worst that could happen with insufficient Telemetry ratio: Sensor Lost. EdgeTX 2.8.0 with internal ELRS modules have eliminated the Telemetry Lost/Recovered call outs, for me at least.

@MCsCreations Жыл бұрын

Really fantastic information, Lee! Thanks a bunch!!! 😃 Stay safe there with your family! 🖖😊 Merry Christmas and happy new year!

@jwc4520 Жыл бұрын

Just a quick line to wish you and yours a Merry Christmas, and prosperity in the new year.

@pierholtrop5432 8 ай бұрын

Very informative channel !

@beefybeef1326 Жыл бұрын

Very interesting. Thanks for this video. I actually had this jerky issue while running the yaapu script on the RTF version of the xiake800. As soon as i tried to change to 100hz-full from the default 333hz-full there was alot of lag on yaapu.

@petrokey Жыл бұрын

Finally someone from ExpressLRS team! Can you please advise if there is any document on elrs phisics/protocol? How does it handle interferrence, packets structure, etc...

@Painless360 Жыл бұрын

If you want that level of detail I would strongly advise you to get involved with the project via Github as a lot of the detail is in the code. Best of luck

@petrokey Жыл бұрын

@@Painless360 You've gave me the same answer as Joshua ;) I've already posted few questions there, entered the discord etc... however I'm still looking for easyer way of getting info :)

@afterburnerrc6333 Жыл бұрын

Hey, first off Merry Christmas! This is a great video, I am curious, for the Telemetry Lost reporting couldn't you just set the Telem Ratio to Std (1:128) and let the system adjust itself or is that not correct?

@Painless360 Жыл бұрын

That would be step one. Issues arise with certain telemetry heavy applications.. Happy flying

@pav2k Жыл бұрын

Why does GPS data seems like it doesn't fit the ratio? It updates much slower than something like RSSI

@JaWizard 8 ай бұрын

So would I be safe with 333hz with 1/32 telem packet? Tx power 500 is a good middle ground?

@RCwithSohel Жыл бұрын

Is there any way of using the telemetry data received from ardupilot+elrs rx setup to use it on a pixhawk based DIY ardupilot antenna tracker on ground? Basically feeding the pixhawk of antenna tracker, the required telemetry data from a ardupilit+elrs rx to operate Is there any way of doing so?

@Painless360 Жыл бұрын

Check out github.com/ExpressLRS/ExpressLRS/discussions/1352

@carloujosephtorres2647 Жыл бұрын

Can we use an FrSky telemetry module like the FrSky LiPo battery sensor to an Express LRS Receiver. If yes, how will it be connected?

@Painless360 Жыл бұрын

Nope. Happy flying

@blooskyy7 4 ай бұрын

Great topic. I'm currently having an issue with one of my ELRD RX where only 10 telemetry sensors are received on the TX (TX16S MII),. Do you possibly know why this may be? I've tried two different rx with the same result. FYI the FC is a Speedybee F405 mini v3, running Rotorflight v2 (latest version).

@Painless360 4 ай бұрын

I'm not familiar with Rotorflight yet, so I'd assume it's something to do with it... Happy flying

@natlozzz Жыл бұрын

Hello there, question: Will there be a 868 MHz and/or a 900 MHz version of these transmitters for European / US users?

@Painless360 Жыл бұрын

Of enough ask RadioMaster, maybe..

@richardamiss7000 10 күн бұрын

Wondering if you might do an update now that Mavlink-RC is a feature?

@Painless360 10 күн бұрын

Thanks for the idea, I'll add it to the list!

@Rcfishingagadir Жыл бұрын

Hi which packet rate and telemetry ratio is best for rc long range fishing boat thanks. Im using jumper t pro...and matek pwm receiver..thanks

@Painless360 Жыл бұрын

Not sure for boats. I'd guess you don't need super fast resposes so a low packet rate would be the place to start. 100 maybe? Best of luck

@Rcfishingagadir Жыл бұрын

Ok thanks a lot . what about ratio....should i put std.

@Painless360 Жыл бұрын

I'd start there and follow the advice in the video... best of luck

@nestwolfsteiner2292 Жыл бұрын

is it planned to have a MAVLink connection via ExpressLRS?

@Painless360 Жыл бұрын

Looks like it. See github.com/ExpressLRS/ExpressLRS/discussions/1352

@nestwolfsteiner2292 Жыл бұрын

@@Painless360 "full MAVLink" over ExpressLRS will be a game changer for many applications, e.g. camera drones or autonomous VTOL applications

@Painless360 Жыл бұрын

So would SBUS ;) happy flying!

@maixechrys6264 6 ай бұрын

Hello community! Is it possible to get the battery data from an Frsky x9slim+ receiver using a Mlvss Mini Lipo Voltage Sensor connected to the smartport? Is the function lost when transitioning to Elrs?

@Painless360 6 ай бұрын

ExpressLRS recievers have something similar in the way... Stay tuned

@maixechrys6264 6 ай бұрын

@@Painless360 Well Lee, thing is that im currently switching to Elrs using the r9 tx and r9slim rx. Trying to set it up using sbus but the telemetry from s port is lost and the voltage sensor no longer provides telemetry. Am i doing something wrong or the sport sensors loose functionality when using Elrs? Pixhawk is receiving sbus fine through the rc port, and the receiver is supposed to transmit s port data right?

@Painless360 6 ай бұрын

If you are talking about when you flash an R9M receiver with ExpressLRS, then I don't know. I'm not aware that using Smartport sensors will work. Telemetry from the flight controller via CRSF should work fine so I'd use that.

@maixechrys6264 6 ай бұрын

Yes exactly im talking about r9 slim+ flashed with elrs, its quite a pitty as I have not found any other reliable way to measure total as well as individual cell voltage to prevent any bad battery misshaps. Is there any other way to measure individual cells? It was convinient having many spare MLVSS laying around.. @@Painless360

@Painless360 5 ай бұрын

Telemetry from the flight controller via CRSF should work fine so I'd use that

@gm743633 Ай бұрын

I cannot find a consistent answer for the radiomaster rp1 tx power (Telemetry back to the controller). Some places say 10mw and others 100mw. What is it?

@Painless360 Ай бұрын

10mW on RadioMaster website... Happy flying

@gm743633 Ай бұрын

. I found there are different power levels for receivers. The radiomaster rp1 is a nano size and therefore power is low. I found a diversity elrs iflite receiver that tx's up to 250 mw. Thanks for the fast reply.

@Painless360 Ай бұрын

Yep, Tx power for telemetry varies hugely on the receivers out there... Pays to check the specs before you buy.

@gm743633 Ай бұрын

@@Painless360 I don't understand why receivers would not match the rc tx power. But then I can always choose something different. As a new guy to the fpv hobby I understand that 10 and 100mw rx's work great for normal distances. I would like to have the same range for both rc txcvr and plane telemetry txcvr. I'm finding it difficult to find a 250mw telemetry txcvr. The rp3 says its 100mw, still looking though.

@Painless360 Ай бұрын

Not everyone wants to fly the same distance from the radio. Also, not all powers are legal in all places.. Happy flying!

@neilfpv Жыл бұрын

I was unlucky switching to ExpressLRS Happy Model. I encountered failsafes less than 100ft. HappyModel helped and tried their best to troubleshoot the issue but they can't figure it out. Inside the house, I am able to arm it. However once I am outside the house(temps below 15-20f), I am unable to arm it. They wouldn't connect. Sometimes I am able to arm it and fly but it will failsafe within 100ft. The ELRS developers also helped me debugged the issue and they think the issue is on hardware specifically the clock. It is documented very well in 2 or 3 of my youtube videos. I just restored back my TBS crossfire hardware.

@Shauny_D Жыл бұрын

me too

@JustinHunnicutt Жыл бұрын

There's a big section about that on the ELRS website and it shows which combinations need to be avoided and also in a move to try and mitigate that a lot of happy models new stuff have temperature controlled oscillators. But I've seen essentially that same comment multiple times that someone would switch over to elRS have problems and go back to crossfire. It seems like if you value simplicity or reliability untested ELRS setups and especially anything happy model is probably never going to be able to compare to things like TBS crossfire or TBS anything.

@christhorney Жыл бұрын

I have a happymodel ep1 and ep2 and have had no issues with a jumper t pro internal elrs, I went out to 1.5km today at 250mw I was at between -85 and -94bdm when I did a circle to check antenna placement, on the ep2 ceramic thing I went out to 1.2km and was touching -100dbm and it's really not well placed

@neilfpv Жыл бұрын

@@christhorney Nice! The Happy Model engineers and ELRS Engineers worked with me and they can't figure out for a week why I was having issues. The only last thing they can think that's a possible culprit is the crystal chip and the very cold weather. They said it could be from a bad batch.

@christhorney Жыл бұрын

@@neilfpv is that in the receiver or like the transmitter module? i went out to 2.5km today its truly amazing whats possible i feel like im just scratching the surface lol. if you already have crossfire gear then its not like thats terrible lol i just had the emax d8 before this so you can imagine how amazed i am lol, its terrible your having issues thats the problem when you have great software and technical but manufacturing seperatly, hopefully your crossfire works flawless?