No GPS fix when battery is connected? This is why!
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- Опубликовано: 8 сен 2024
- Support my work / pawelspychalski
One of the major problems of the new class of 4-inch long-range quadcopters (Flywoo Explorer LR 4, Diatone Roma F4 LR, and similar) is weak GPS performance. Some people suggest twisting wires, some to power up GPS before VTX, but deep down, we all know that this kind of magic solution only masks a problem. You need a better GPS module.
Diatone Roma F4 LR bit.ly/38CB10a
Matek M8Q-5883 bit.ly/3ZVtPEd
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Yes. This is a proper conclusion. The connection between FC and the GPS has nothing to do with it. The only thing that matters is the RF/EM noise around the GPS. So moving the GPS or getting a better "shielded/filtered" unit is the solution.
However, I had a similar problem on my flywoo and I had a simple fix. Just move the GPS above the camera (further from the VTX) and it works like a charm now.
Think I mentioned previously I repositioned the GPS to the front of the quad on a small GPS stalk mount and it works perfectly, when I tried it in the garden I got 18 sats and when I plugged in the battery it didn't loose the lock (I also moved the GPS positive to the 3.3v rail and use a USB power bank to initially power the quad on until I get a lock).
I installed my first GPS on the quad I just built (in a Bee35 Pro frame). I went with the HGLRC M100 Mini GPS, which is a pretty dirt cheap, tiny GPS. I added a ViFly GPS-Mate, too. I start the GPS fix process using the button on the GPS-Mate on my way to fly. It tends to be ready when I'm ready to start flying (a couple minutes later) and while I'm flying I tend to see 20+ satellites. I've considered myself lucky from the start :)
Funny, I have the same frame and I use my old iFlight M8 GPS (it was perfectly fixing sats before on a 6" drone) and If I power the drone with the 6s lipo, it needs 10 minutes to get 6 sats :/
So now, I'm using a power bank 2 minutes before plugging the 6s and got 15 sats.
I know the GPS mate, I'm using one on a ATOMRC Dolphin it's very nice to keep O3 off before lunching the plane ! Good solution too !
I had no luck with 2 of the Diatone GPS modules, then I tried the TBS module and still no luck, bought the Matek M8Q and I have working GPS.
Oh. Other guy bought tbs and worked great. I bought hglrc and flywoo v2 to test
great explanation as always! :) Im using the matek gps module and I can say that its well worth its price.
another nice trick im using is powering the gps module from a 4.5v pad - and "warming it up" with a powerbank to usb connection that will power the 4.5v pad without powering the vtx.
Do same thing. (Is it 4.5v? I think it's 3.3)
@@aemarkov I believe the matek requires at least 4.0v to work - I didn't try it with a 3.3v pad.
@@aemarkov bn-180 is working with 3.3v but , its still a bn-180 😆
My Matek is why I’m here looking for a solution.
Just had a thought.......it would be great if betaflight was able to detect the bitrate of the dji system so that for example if the bit rate hits 0 mbps for more than a pre set time then the gps failsafe would kick in.
So a failsafe for Rx loss and also video loss!
The TBS M8-2 works great for me, quick to lock on, less then 20 seconds on a cold start
I can second this the tbs m8 is the best I’ve used of all gps units less than 30$
Great to know! Thanks! 😊
Because it's GLONASS only. I noticed the same and now only use this GPS. I get a lock in 30 seconds or so every time.
Great tips....btw when I have problem to get satellite, I connect FC to power bank/handphone in order to turn-on FC. Then after get some satellites/3D TRUE (check using BF on android app), I disconnect power bank then connect battery and fly with GPS locked. As you mentioned, the GPS module getting issue because of VTX signal, that's happen in my drone also.
Before I know that way, at least I need more than 5 mins to get sats & causing Core Temp overheat
Perfect timing because I am struggling with this right now. GPS reception is okay now, but I still get some toiletbowling so the mag is still getting interference. My 3D printed mounts are getting longer and longer... lol
if you use lion batteries than problems in it.
Thanks for your video! I shielded wire with fosil in my Roma F4, it helped, GPS can work somehow, but it's very unreliable and inaccurate, especially, height. I'll try you approach.
I have an M8Q-CAN on my Roma F4 frame. It works great. I moved it above the top plate.
Hello pawel, your diagnosis is correct but the only solution is to move the gps as far as possible from the vtx antenna, no change in the gps will help or a better gps if the field where it is located is saturated by radiation and harmonics from the vtx , kind regards
Recently, I saw a drone channel recommending powering up the GPS with a BEC without using the FC 5V supply. So, I will test it as soon as possible to see if the GPS works better.
might but also might not work. Sure, good external BEC might have better filtering than FC BEC, but the problem might be coming from somewhere else or still be not enough
I just print a different mount for the original GPS to move it a little to the back (around 1.5 cm)
In the space added between the GPS and the frame I put also a small buzzer with the battery
I used the serial 4 instead of the 5 to use the original wires and I connected the GPS power to the 3.3 instead of 5v
Now acquires the fix in less than 1 minute with the cold start :)
Would happen if tried to placed GPS above the front camera?
Realize it would interfere with mounting HD camera above; but curious if issue is more interference with VTX, or ESC/FC radio noise.
Another option, mounting GPS on top of battery.
Again, realize not the most pragmatic solutions; but worth noting/experimenting to collect real life data .. as to source of noise and its radius of influence. ;)
I built flywoo explorer lr, with matek GPS+compass, matek FC with baro. And most importantly flashed INAV. Just to keep my mind in peace that the quad can go home and land properly at will or on failsafe.
Those cheaper small GPS got huge interference from Flight controller. My cheap GPS - 3d fix is lost if i move my powered quad closer than 2.5 - 3 cm closer to rear of my quad.
Right now im trying to upgrade gps chip firmware, but i think i need just new longer GPS mount.
That's really interesting! Thank you, Pawel! 😃
Stay safe there with your family! 🖖😊
Maybe the VTX antenna which is sending the signal and is over the GPS antenna interferes with its working speed? Why not put a GPS mount above the VTX mount and have clearance for the GPS antenna to the sky so it can work without any obstacles?? All GSP drone manufacturers seem to stubbornly keep mounting the GPS below the VTX antenna - and this does not help in anything.
GPS at the front of the quad and vtx at the rear.
or use proper shielded cables
😁i was looking at this video thinking that you had discover the magic, but yeah, I will just throw the flywoo gps to the garbage....😀
Tried buying and installing expensive matek gps. No result, still no fix on battery, can't deal with the problem.
Good man!i love it when reviwers use words like sucks crappy disguid or even dont buy .
its the motors shielding on longer arms the magnetic fields wont affect the gps antenna.
yep noticed the same on my fixed wings and DJI fpv, when GPS and VTX antenna are to close GPS takes a freaking long time.....
Mam dokladnie ten sam problem. Dzieki za podpowiedz.
To problem większości tanich GPSów
It is possible to turn off compass signal from gps module and use magnetometer on fc? Some CLI commands? My compass in gps module shows always different inaccurate values.
Hi @Pavel - many thanks for the video. Got a quick question sir. With the better GPS units (like the Matek or the better beitian), is mast mounting the GPS still required in iNav, or will this type of 'hanging off the back' mount work as well?
have you tried assist now with ublox software ? I2C pull up resistors when using inav ? it is possible with those cheap gps modules But youre totally right using the matek m8q. Use it on all my quads and get a rocksolid fix within a minute !
flywoo exlorer not have this problem . on this kwad other problem , in stock gps works on 9600 baudrate and betaflight have glitches with gps rescue... to fix you need to set 57600 baudrate , than all works perfect.
I crashed my eachine novice iv and the bn 180 came loose and a piece broke off the board. Bought a new 1, and still get as many gps as with broke 1... zero. When replacing the bn 180 do I need to do something in betaflight? Or can I just omit that setting all together?
Hi. Thanks for your time and test! On my geprc baby crocodile, GPS is above vtx antenna. Maybe it is little bit better? You could try :).
It is a bn220 maybe better than bn180 on some other 4" lr?
And for me the first fix take 2-4 minutes. And some time I get fix inside my house.
Bn220 is enough good or I should upgrade to a more reliable one?
the bn 220 has flash memory and you can use assist now with it
@@puntenpol Assist should be loaded from computer? Or juste enable it into betaflight is enough? How many time value are valid? thanks.
@@J2_P it's an option in the ublox software, you have to make a free account and it basically flashes the satellite positions from your area into the GPS memory. Yes it's from pc
@@J2_P type in RUclips gps fix tmac. You'll see a tutorial
I use BN-180 for 4", 5" and BN-220 for LR 7" and LR Capricana v2 LR Wing and a 880 for my 2200mm Wing
How does the BN-180 match up against the GPS-module you're using in this build. I'm planning on sticking one on a 5" and a LR 7" and my BN-220 on my Caipirahna
Nice video ta. Coincidentally this is exactly what I'm doing this minute. Matek GPS going in. What's your thought of installing inline filter capacitor, either across battery or the GPS power feed ?
Hi Pawel
I have bought an iflight gps and set it up on my quad. But whenever I turn my drone on, it takes 3-4 minutes to find satellite in outdoors! However my friends find satellite in less than 15 seconds in the same place!
Could you help me how to resolve this problem?
Best regards.
I've gone 2 days no fix. Leaving drone on for hrs. Tried even vtx antenna moved away from above it.. phone far from the drone.
Then other times I get sats in couple of minutes lol . I tried shielding cables now
Good honest info, thanks Pawel. My Chimera4 GPS works okay except for altitude, which is radically incorrect and all over the place. I got a new FC with a barometer to replace stock...will Betaflight GPS rescue use barometric altitude or GPS? GPS altitude seems problematic even in more general use (besides quads).
Good afternoon friend, can you help me? I have vibration problems on the drone what will it be? 🤔
Hmmm, we have not come to the bottom of this problem yet.
I have a crappy HGLRC M80 GPS on a crappy (inaccurately cut) Rekon 5 frame. I got an expensive GPS, but I don't have a TPU piece to mount it in. In my desperation, I replaced my crappy HGLRC VTX instead with a Rush Tank Mini I already had. Believe it or not, problem solved. Happy as can be. It quickly finds 11 sats.
Thanks for all you done for rc hobby, but no one electronic engineer will do not know value of period for frequency of 50 Hz . You are thinking about electrical noise around gps searching of reason do not correctly working gps. You shold know that any electrical or magnetical traces of any equipment of drone cannot has any significant value in band of gps frequencies. One of the reason can be only the signals on power supply lines. Why you dont use the oscilloscope ?
My Matek connects after a while via USB but not well with Battery
i wanna share with you what is just happened to me . I've build a new quad on Diatone Roma v2 frame , speedybee stack, mamba ultra vtx , t-motors pacer 2305 and some GPS antennaa (Beitan 180 , beitan 220, tbs 22mm , sorry but i forgot model about tbs) . Speedybee for rx and gps dedicated uart have a dedicated 5V pin , you can power uarts by USB. Well on GPS uart tension was 4.31V , i've tried quad and no way to have GPS fix . I tried all GPS module here and no way , no fix. Two days ago i tried to connect GPS module to "normal 5V" and yesterday i've got fix in 3 minutes. 8 Sats and then increase to 12 / 15 sats during flight. I don't understand why it works now. I do not really know. Electronics mystery. By the way i will follow your advice and i'll buy a better GPS. I wish you ah happy New Year!
I have 3 of these type quads that i built not prebuilt and every one of my gps work fine so its in the way they are being built from manufacturers all 3 are analog with tbs pro32 vtx nanos one diatone one flywoo and one hexplorer mwaybe just the way im runing wires and differant components but they all work i have an hglrc in 1 a flywoo in another and an i flight gps units
Off topic, but any thoughts on getting proximity sensors in OSD? Does inav support this?
Or just buy the GEPRC Crocodile Baby instead. Mine gets locks quickly without having to modify anything.
Same for me, see my comments just below :).
Crocodile? Really? Get a GEPRC 7" LR
GEPRC Crocodile Baby gps is BN220?
@@seesea9614 According to the specs on banggood it's a BN-228.
I have the same problem with my 4" using HGLRC gps. Still not working. I will try a different gps. On my 5 inch quad I changed to an expensive BRAINfpv GPS and it works magnificently now. But the BrainGPS is way too big and heavy for a 4 incher. I will order Matek. thanks
Smaller list of gps options, if you’re going to run iNav. You need that magnetometer.
last update betafl 7.5" 18gps no 3d fix(
@Paweł Spychalski
Would Matek SAM-M8Q be any worse than Matek M8Q-5883 in terms of sensitivity to noise?
I have tried SAM-M8Q on Eachine Novice IV and it also struggles to get GPS fix.
Maybe Matek M8Q-5883 would work better...
They should be on-pair
Pawel. Could show how to program a pitpal vtx power on off switch in 2.5. similar to beta flight PINIO settings...please
Curious to see what you do with inav on this, I have not run across any directly supported 16x16 flight controllers. :)
Changed 5$ GPS module to way pricier Matek and situation is still the same - after connecting LiPo GPS satellite count goes from 10+ to 4-5 no matter how weather is or how i place my drone. Very big bummer. Everything was working great with old VTX (AKK Race Ranger). After changing it to Rush Tank i have GPS issues.
Then maybe it's a VTX issue? Take a look at this ruclips.net/video/QfwV7NP5BI8/видео.html data shows that better GPS is just better
Matek make the best products.
Agreed.
Mine works moved vtx antenna to the side of the quad and changed it to a bn220
Not sure it’s the size...my GTR349 gets 11 sats with a bn180
This bug with inav only. Same setup work fine in betaflight and with other software in FC gps fixed fine. GPS FIX bug - this is inav bug
what the heck is wrong with people putting GPS antennae under the VTX feeders? Why most of the quads are designed so? If you add the GPS function - make sure it works, otherwise - do not add it at all.
I found that putting gps on a race quad is problematic. I don’t know why ? Ended up removing it.
well, GPS on a racing quad is useless. It's also useless on a freestyle one :)
Mam taki problem, że GPS po USB w BF chodzi a z lipo nie :/ Wcześniej wszystko normalnie chodziło :/ Dron HGLRC Rekon 7.
No to właśnie to. VTX lub kamera HD sieje
mine was taking 20 mins to latch on sats got a new puk all sorted turns out it was the battery on the gps was dead
That also does not help :) But 20 minutes is max interval. Even if cold start takes longer than 5 minutes, something is wrong
Use cat 6 shielded Ethernet cable terminate both ends !
The small 18a bt from RDQ works great for me but i wish it locked a little faster on cold start. First time in new location takes a minute or 2
Is this why Mataksys is so much more expensive?
quality can be expensive
please go to manual focus for the camera next time 👍🏼
Need tpu mounts for these slightly bigger gps's
or change VTX to fully shielded? in my free time I will check the noise level on ~ 1.2GHz (GPS) using HackRF from my VTX
Those things are not really shielded. Or rather the fact that there is an alu enclosure does not means it's connected to ground and acts like a shield at all
@@FPVUniversity its not need to conect to ground. i use about 3 years this type of shildig ( wihout grounding) for gps and it WORKS!! this type of shield reflect radiowaves.
@@FPVUniversity without filters or a badly designed VTX, the screens will not do anything because the noise will come from the antenna. But maybe we can find beter and worse models :)
Wrap all the wires in copper tape and it will be perfect
I tego szukałem 😁
answer at 5:00
I have a number of bn880 gps without issues from 2.5 to 5 inch quads
u willing to sell one? Use a BN-180 for quads up to 5". 7" LR can also use the Beitan 180, but a BN-220 is ideal for LR quads, 7" and 15" and LR Wings
Putting the GPS reciever directly under and next to a VTX...stupid... TBF, BF Satallite support is crap anyway, so it's a combination of things..On my iNAV Quads, the GPS is at the front of the quad, VTX at the rear...Lipo is underslung giving antennas an easier time. Not having underslung Lipos, another design blunder...🤔🙄🙄🙄🇬🇧
or just put Gps module on the arm near motor, and problem will be solved
and do you want to have a GPS that costs a measureable amount of gold coins right below the rotating propeller that might bend and hit it with all the force?
One idea is turning off telemetry. I wouldn’t want to but if it came to it I would do it