How to Setup DJI FPV System (Air Unit, Goggles, Remote and Betaflight)

by Oscar
Published: Last Updated on

I will show you how to setup and use DJI FPV system with Betaflight. This tutorial will cover activation, wiring and installation in an FPV drone, pairing between FPV goggles, Air Unit and Remote controller, finally the basic operations.

Still wondering if you should get the DJI FPV system? Check out my review. You can get the DJI FPV system from these vendors:

Turning on FPV Goggles

  • Install the four stub antennas, make sure they are well tightened
  • Power on the goggles with a 3S or 4S LiPo battery using the provided cable (I am using a 4S 1500mAh LiPo for my drone)
  • Put on the goggles, and adjust IPD sliders at the bottom to ensure clear view
  • If you want to record video in goggles, you need to insert a Micro SD card (what SD card do I need?)

Activation

Visit https://www.dji.com/uk/fpv, click Downloads, Under Software, download the latest version of DJI Assistant 2. Install the program on your computer.

Make sure you download the FPV version of DJI Assistant! The wrong version will not detect your FPV goggles and Air Unit.

Power on the DJI FPV Goggles first before connecting it to your computer via the provided USB-C cable.

Launch DJI Assistant 2 and login with your DJI account (Sign up if you haven’t already).

You should see the “DJI FPV goggles” icon. If you don’t see it, reconnect the USB cable. Note that it could take a minute or two for the computer to install the driver when you connect it for the first time.

Click the icon, and you will be prompted to activate your device. Make sure you have internet connection!

You will have to activate each component separately, but the steps are the same. Repeat these steps for the Air Unit (and remote controller).

Installing Air Unit In the Drone

If you are building a drone from scratch with the DJI FPV system, it’s best to get a frame that is designed for the DJI Air Unit. Usually it comes with 3D printed parts to fit the Air Unit and Antenna.

Here is a list of frames made for the DJI Air Unit.

If you are upgrading your existing FPV drone, and don’t want to invest in a new frame, check on “thingiverse.com” and see if there are custom designs for your frame that you can 3D print. I am still using the Martian II frame from 2015, and there are already some really nice designs available.

Connecting Air Unit to FC

Full Size Air Unit

If you get a flight controller designed for the DJI Air Unit, you can simply connect them with a ribbon cable, and forget about all the confusing wiring diagrams :) But if you don’t want to spend extra on a new flight controller, I will show you how to connect the Air Unit to your FC.

The DJI Air Unit takes 7.4V to 17.6V voltage, you can power it directly from a 3S or 4S LiPo battery.

However, I’d recommend powering it from an external voltage regulator, or a BEC on the FC. That’s because voltage spikes from motors and ESC could damage the Air Unit (same way it could damage your analogue VTX). Installing extra capacitor might mitigate this problem.

Caddx Vista

The Caddx Vista Air Unit even supports higher voltage up to 6S, and therefore you might get away with powering the Air Unit directly from 4S LiPo Battery. But if you want to play safe, use a voltage regulator or BEC on the FC.

With the Vista however, there is no JST connector, you have to solder your own wires to the pads.

* SBUS connection to the flight controller is optional

BEC Requirement

If you are using a BEC / voltage regulator to power the Air Unit, make sure it can supply enough current. Max power consumption is 8W for the Air Unit, the current requirement changes under different input voltage:

  • 9V => 0.9A
  • 12V => 0.7A
  • 16V=> 0.5A

If the BEC on your FC doesn’t meet the voltage or current requirement, you could use an external voltage regulator. I used this little voltage-adjustable regulator with good result.

Before Powering Up

Before powering on Air Unit, make sure the antennas are attached and the wiring to FC is correct, otherwise it could cause irreversible damage.

With the Caddx Vista, don’t forget to install the antenna connector holder properly!

Pairing FPV Goggles and Air Unit

In order to get image on your goggles from the camera, you have to first pair/link your DJI FPV goggles with the Air Unit.

Power on both FPV Goggles and Air Unit.

Use a small pin or needle to press the link button on the goggles that is located next to the power connector. After that you should hear a continuous beeping, which indicates the goggles are ready to be linked.

Wait until the LED on the Air Unit becomes solid green, then press the link button on the Air Unit which is located under the SD card slot.

The link button on the Caddx Vista is located near the USB port (it’s a push button).

Pairing should complete within a few seconds. Once they are paired, the beeping should stop and you should see an image in the goggles from the camera.

Using DJI Remote Controller

It’s NOT compulsory to use DJI’s remote to control your drone, you can use whatever RC link you prefer, such as Frsky and Crossfire. But there is already receiver capability built into the DJI Air Unit, so you could save an additional receiver :) Totally up to you!

Here is my review of the DJI Remote.

To turn the radio on or off, simply press the power button once, then hold it for 2 seconds.

Pairing Remote to Air Unit

If you are using the remote, then you need to pair it with the Air Unit.

Note: you should bind the FPV goggles to the Air Unit first before binding the remote.  otherwise you could lose the bind to the goggles and you have to do it again. It’s a weird bug.

First, pair the Air Unit to the FPV Goggles first before the radio, otherwise you’d have to repeat this process.

Power on the Air Unit and Remote Controller, but turn off the FPV goggles.

Wait until the LED on the Air Unit becomes solid green, then press the Link Button on the Air Unit.

Press the record button, C button and the right dial at the same time. The Radio should now beep continuously.

The linking will take a few seconds, once paired, the beeping should stop and the status LED on both devices should turn solid green.

Note to Japanese users: If you bind your goggles to the air unit, then bind the controller, your goggles might stop working and shows a message on the screen “Image transmission stopped”. This could be due to the Japan firmware restriction. To work around this, I’ve been told you could try performing FCC hack on the Air Unit, after you bind it to the goggles, then unplug everything and bind the radio.

Radio Settings

You can configure radio settings through the OSD menu in the Goggles, “Settings” => “Remote Controller”.

Here you have Servo Setup, Function Mode, Stick Mode (mode 1 and mode 2) and Calibration.

The First thing you should do is to calibrate your sticks in the “Calibration” menu.

Then go to “Servo Setup” to make sure all your channels are sending out 1000 – 2000 when you move your sticks to its maximum position. These are called “End Points”. It’s okay to have your end points slightly beyond the 1000-2000 range. For example, your lowest end point can be around 995 to 1000, and your highest end point can be around 2000 to 2005.

The switches on the radio are pre-configured and take up channel 5 to channel 8:

  • CH5 = SA
  • CH6 = SB
  • CH7 = SC
  • CH8 = SD

Now go to Betaflight’s Ports tab, enable “Serial RX” for the UART which you’ve connected the SBUS wire to on your FC.

Under Receiver in Configuration tab, select SBUS in “Serial Receiver Provider”.

Go to the Receiver’s tab and check if the “bars” are responding to your stick movement. If channel outputs are responding to the wrong stick, here is how to fix channel map.

If everything looks right, you are now ready to use your radio to fly your drone :) Oh don’t forget to setup switches for arming first :)

Gimbal Tension Adjustment

Finding the sticks too loose or too tight? You can adjust gimbal tension by turning the screws on the back of the radio.

You can access these screws by pulling back the rubber plates.

Stick ends are M3 threads ( in case you want to get some custom stick ends).

Lock Mode

There are only two buttons on this radio, a power button and a “C Button”. Power button is self-explanatory, the C button is for “locking” all the sticks and switches so no RC signal will be sent out. This is a safety feature to avoid accidentally arming your drone.

Simply hold down the C button, and the status LED will flash purple to indicate it’s in lock mode

Remote Antenna Placement

For maximum performance you should have them both pointing up when transmitting.

Removing Battery

If you ever need to remove the battery, open the cover, hold down the battery release button and push the battery downward.

Remote Status LED / Beeping Explained

  • Solid RED – Powered on, but not connected to receiver
  • Solid Green – Working, connected to receiver
  • Blinking Blue and beeping at medium speed – Binding
  • Blinking Purple – Locked mode (Hold down C Button to lock/unlock sticks and switches)
  • Beeping alternate sounds and vibrating – Requires calibration (do this in FPV goggles)
  • Beeping and vibrating – Low battery <10%
  • Beeping at low speed – throttle stick is not at its lowest position

Betaflight OSD Setup

In order to get OSD working, you must connect the TX and RX pins on the Air Unit to a spare UART on the flight controller, as shown in the wiring diagrams above.

Depends on which UART you connected the DJI Air Unit to, enable “Configuration/MSP” in the Ports tab in Betaflight Configurator for that UART (and keep all other options disabled).

In the Configuration tab, under “Other Features”, enable OSD, and TELEMETRY.

Finally, in your DJI FPV goggles, turn on Custom OSD under Settings, Display.

Now you can select the elements you want to display in the Betaflight OSD tab. Not all the elements are supported yet, but DJI has been making some progress to support full Betaflight OSD.

For now the following elements are supported as on Mar 2021.

You can drag the elements around on the preview screen to change their locations, same as the normal Betaflight OSD, it will get updated in real time in your DJI goggles. You can also set and save element position using CLI.

Video Feed Quality

You can adjust video feed quality under “Settings”, “Transmission” in the OSD menu.

Best Image Quality Settings

  • Preference: High Quality
  • Focus Mode: Auto (or OFF)
  • Bitrate: 50Mbps

If you don’t have the Bitrate option, you should update your DJI firmware to the latest. If it’s greyed out, it means you are on CE mode, 50Mbps only available in FCC mode. How to switch to FCC mode.

Lowest Latency Settings

  • Preference: Low Latency
  • Focus Mode: Auto
  • Bitrate: 50Mbps

Using 50Mbps bitrate doesn’t seem to affect latency (similar latency to 25Mbps), but you will only have 3 channels available instead of 8.

With Focus Mode enabled (set to on), you will constantly get blurry edges in order to reduce the amount of data when signal gets weaker, this can be quite distracting. By setting it to auto minimizes blurry edges.

Example of focus mode (blurry edges)

  • Focus Mode – optimizes the center of the view, makes it smoother and clearer when signal becomes weak. I recommend leaving this setting at AUTO.
  • LED Mode increases color saturation on the LED racing track in low light, making it easier for the pilot to fly in any direction.
  • Racing Mode increases the display contrast, which makes obstacles more distinguishable in day light.
  • Standard Mode is suitable for most environments – use this mode if you are not sure what is best.

How to Record Video?

Insert micro SD card in the FPV Goggles and Air Unit (except the Vista which doesn’t have a SD card slot). Here are my SD card recommendations.

And format the SD card inside the goggles using the menu, this will avoid many issues later on.

Set your recording preference in the FPV Goggles settings. You can change resolution if you are recording in the full size air unit, between 720p 60fps and 1080p 30fps. However you cannot change resolution for the FPV goggles recording (DVR), as it’s fixed at 720p 60fps.

By default, the recording starts when you arm the drone, and it automatically stops and saves the video when you disarm. You can also start recording by pressing a button by changing the setting in the goggles.

OSD data is saved in a “.srt” file (subtitle format), these are just plain texts, you can overlay it on top of your video when you play it, or edit it.

By default the SRT file is quite a mess with possibly a lot of unwanted data in there. You can clean that up using a tool I made.

Uploading FPV Footage to Youtube

I’ve found the best way to upload DJI FPV footage to Youtube is to “upscale” them to 2K, or even better 4K. This is because Youtube retains higher playback bitrate for videos with higher resolution.

You can learn more about this in this post.

Other DJI FPV System Tutorials

Official Manuals

Edit History

  • Mar 2020 – guide created
  • May 2020 – updated OSD setup
  • Jun 2020 – updated instructions for the DJI Remote
  • July 2020 – added “Video Feed Quality” and “How to record video”
  • Aug 2020 – added links to “enable 50Mbps” and “how to upload to Youtube”

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50 comments

Mana 20th June 2021 - 7:01 pm

Hi Oscar, can you confirm that the right antenna from rear of Air Unit is using only the TX to DJI remote controller ?
Cause in the JohnyFPV hack video we could see that he used only one antenna : youtu.be/zVB7yFvCDyQ?t=33

Reply
Oscar 20th June 2021 - 8:26 pm

Nah, he’s using both antennas, pause it and look closer, one antenna is pointing up while the other is ziptied to the arm.

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Mana 19th July 2021 - 2:37 pm

Oh yes correct !
But I unddrstood that one of the antenna from air unit is used for the DJI remote controler.
Could you confirm this information ?

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Oscar 20th July 2021 - 11:24 am

No it’s diversity.
If the DJI remote needs a dedicated antenna, then you’d assume the Vista wouldn’t support the remote right? But the Vista also works with the Remote for having just one antenna :)

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David Canole 7th June 2021 - 5:58 pm

I still can’t get BF OSD in my goggles using CaddxFPV vista. I have done everything said here and what others suggest with no luck. Done the power hacks … I’m in fcc… 50 mbps…. 1200 mph hack… everything in BF is set … turned on… or off rssi adds or whatever it is …still stuck with just Default OSD….HELP PLEASE…could it be something in cli?….

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Oscar 7th June 2021 - 6:40 pm

There’s a possibility that one of the diodes have gone bad in your Vista, it’s a common issue that causes OSD to fail to appear.
Check out this thread, they show you where that diode is and you can try to bypass: https://intofpv.com/t-caddx-vista-bad

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Phillip Adams 14th April 2021 - 5:53 am

Oscar, i have the DJI FPV II system. I also have the EMAX BabyHawk HD. Any chance my DJI goggles will sync with the BabyHawk?

Thanks
Phillip

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Oscar 14th April 2021 - 12:19 pm

You mean You have the DJI FPV Goggles V2? In that case they should work just fine with DJI Air Unit and Caddx Vista.

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yannick Colin 5th April 2021 - 10:14 am

hello Oscar!!! what is your frame please?

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Oscar 6th April 2021 - 1:24 am

Martian

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Joe 31st March 2021 - 2:55 pm

Hey Oscar,

Incredible write-up! It’s greatly appreciated. I recently purchased the DJI FPV controller 2 version. It’s very different than the one shown in this article. Are you familiar with whether I should expect a similar syncing process and set up with the latest remote?

Thanks!

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Oscar 31st March 2021 - 4:38 pm

The FPV Controller V2 is only compatible with the DJI FPV Drone. You can’t use it with custom built FPV drones.

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Dee Bee 24th March 2021 - 8:03 pm

Sorry a noob question. if i use 1200MW hack on the dji radio. Will that mean that it will have a better range than my Tango 2 ?
I watched some videos and i thought the main reason for Tango 2 is a better range? doesnt Tango 2 have max 500MW?

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Oscar 24th March 2021 - 10:14 pm

Without getting too technical, your Tango 2 on 500mW will still outperform the DJI radio on 1200mW, by a lot.

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Jony Deltoso 8th March 2021 - 10:12 pm

Hello my friend. Nice post!

I have a frame like this. do you have the 3D design of the part to hold the air unit and the camera?

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Oscar 9th March 2021 - 2:45 pm

They are on Thingiverse, not my designs. Just search for “DJI Martian frame”

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Byron Plant 30th December 2020 - 2:10 pm

I wondered if you could help me? I have BetaFPV 95x V2 running – F405 Flight Controller & 16A BLHeli_32 ESC. Im using TBS and it has Caddex Vista DJI. I’ve been trying for a week or so to get the Betaflight OSD information to show in the DJI google, but all i see is the standard DJI OSD info. I have enabled custom display in the DJI googles. And followed JB’s video on how to enable things but with no luck. I also checked all the DJI forums but can’t seem to find any information or things that work. Any help much appreciated!

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Oscar 11th January 2021 - 3:43 pm

Make sure you updated DJI goggles and Air unit to latest firmware too.
And update your Betaflight to latest version.

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Jiří Vancl 17th November 2020 - 9:06 am

Hello your tutorials are very cool. I should beg I really like your tpu holder for airunit for Martian 2. You wouldn’t be so kind and didn’t send me a stl file for printing. thank you very much

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André Linzmaier 12th November 2020 - 11:43 am

HI Oscar, hoping you can help.
I purchased the iFlight Titan DC2 HD RTF bundle kit, which came with DC2 quad, dji goggles + transmitter, charger +batts. Great bundle. Everything updated fine and binded without hassle.
Problem lies with my DJI FPV Transmitter – after updating and binding, I wanted to test it in Liftoff simulator, and realized the right roll has a dead spot. Rolling left, pitching forward + backward is consistent, smooth, accurate and precise, even when doing micro movements. Rolling right is very jumpy, especially the first few millimeters of input. Tried it out on the DC 2, just arming the motors, and moving the pitch/roll stick, same as in Liftoff sim, rolling right spikes and looks like drone is gonna flip. done multiple calibrations, even stiffen the gimbal a bit, but no luck. Betaflight also show that ‘right roll’ input jumps from 1500 to 1750’s the first few mm’s of movement/input

Could this be a gimbal defect? Or could it be software/firmware related?

I’m finding no solution online, hope you can help. This DJI controller is brand new out of the box.

Thanks in advance

Have not tried a different firmware.

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alessandro 9th November 2020 - 10:42 pm

Hi Oscar, thank you for all your content that you share on the web and that solves many problems for us. I mounted a T-Motor Mini F45A hd stack on my frame HD. The Dji viewer works perfectly but the dji radio does not. I activated the right serial rx and set the SBUS receiver in betaflight. Everything looks good but the radio doesn’t connect. However, it binds perfectly with the Vista caddx, I also see the signal in the viewer, but in “reciver” on betaflight it does not activate. I tried to connect the radio to other free uarts but it doesn’t work. I tried to connect a 9r mini receiver as well but that doesn’t work either. So there seems to be a problem with the RX ports. Could you advise me what else I can check? thanks a lot

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ro 5th October 2020 - 10:44 am

And also some of the other parts, like the camera bracket?

tnx
Ro

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ro 5th October 2020 - 10:41 am

Hi Oscar,

i habe a question:
Where or how do i get the mouns for the air unit and antennas, you’ve used on this martian frame?

tnx in advance,
refgards
ro

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Oscar 8th January 2021 - 7:54 pm

It’s a 3D printed part, design file can be found on thingiverse (search term DJI mount for Martian)

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martin 28th August 2020 - 7:29 am

Hello Oscar, can you recommend a descent 9V step up converter for Vista? I want to use Caddx Vista on my Tinyhawk 2 Freestyle like in this video youtube.com/watch?v=suwdTj06pXo . And Vista supports only voltages higher than 7.4V.

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Oscar 4th September 2020 - 4:06 pm

I’ve been using this one, working like a charm.

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Evagoras 24th August 2020 - 12:47 pm

Dear Oscar,

Would it be possible to use a different camera with the air-unit? For example a commercially available camera with an HDMI output or with an output which could be compatible with the air-unit.

Thanks in advance,
Evagoras

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Oscar 4th September 2020 - 3:50 pm

No.
At the moment only the Nebula can be used with the DJI Air Uni.

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Devin f 20th August 2020 - 5:11 pm

Is it possible to just only record footage with dji air unit ?
In other words use the ” dji air unit like a go pro.
I want to buy a drone with Dji air unit but use my analog goggles and Tango 2 remote….
Thanks.

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Oscar 4th September 2020 - 3:20 pm

no, the Air unit has to be paired with the Goggles and they have to be on at the same time to work.

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Damian 11th August 2020 - 4:05 am

I think I found it:
thingiverse.com/thing:4169691

I do have a question related to the antenna mounts, are you using the factory supplied ones? there is a ‘square slot’ for them to fit into on the side panels but I can’t figure out the best way to mount them as its a 90 degree angle on the plugs?

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Damian 10th August 2020 - 1:54 pm

Hi Oscar, what is the thingiverse code for that alien Dji frame mod you are using on the first picture?

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Oscar 17th August 2020 - 7:01 pm

4169691

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Shilo Mccoy 1st August 2020 - 7:39 pm

I got my colors incorrect the first comment. I mean when connecting a vista to a dys f4 pro v2 would yellow go to video out and white go to video in? Or should I use a different rx/tx solder pad on the board somewhere? Thanks.

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Shilo Mccoy 1st August 2020 - 7:36 pm

When connecting a vista to a dys f4 pro v2 would the white wire go to video in and the grey wire go to video out? Or should I just use a different rx/tx solder tabs somewhere else? Thanks!

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Emilio G Masforroll 26th July 2020 - 2:44 am

Hi Oscar great info you have. Am still learning question I have bnf iflight A85 with dji caddx Vista nano , dji remote and goggles .when I fly with the goggles like 30% of the time my quad motors stop in flight and falls to grass camera is still on and I can see video they goggles very strange and my batt r over 50% when it happens and I fly close not far. If I fly without the goggles quad never fails. Is this a problem with goggles

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Edward Robison 23rd July 2020 - 10:57 pm

Thanks for all of the info you post! I had been using the frsky x-lite remote with an rxsr receiver, but I just purchased the dji fpv remote and wanted to use it. I paired it with the vista unit on my one quad and the air unit on my other quad and it shows them Both being bound to the dji remote, but when I move the switches or sticks no Inputs read out in betaflight. So i unsoldered the rxsr receiver on my quad with the vista unit and then I was getting stick and switch input in betaflight and was able to set it up and fly. Can you not have a bound frsky receiver and the air unit bound on the flight controller on the same quad-even if you only have one of the transmitters powered on. Say I want to have the option of using my x-lite remote sometimes, and the dji remote sometimes?

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Oscar 31st July 2020 - 3:31 pm

I don’t recommend doing this. Not unless you have a way to power off the unused RX, otherwise when both RX are powered on, they will be sending signal to the FC at the same time and might confuse your FC.

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Ron Rush 3rd July 2020 - 1:33 am

Got my system about Three weeks ago and I love it never seen anything like it before it’s got the analog beat So far my only complaint is the power plug in the goggles can fall out real easy and then you lose all your video and I haven’t heard anybody talk about that anything can I do to keep it in tighter thank you

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Oscar 4th July 2020 - 3:54 pm

There is a 3D printed power cable holder you can make :)
Works great! scroll down in this article: https://oscarliang.com/dji-fpv-system-upgrade-accessory/

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Daniel Jiménez 2nd July 2020 - 3:41 pm

Oscar, is it possible to connect a VCR to the Caddx unit to get recording like the complete DJI unit does?
Would there be any lag or something similar?

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Oscar 4th July 2020 - 3:52 pm

I don’t think you can connect a VCR to the DJI system.

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ori 16th June 2020 - 1:27 pm

Hello i have a problem when i bind the transmitter the googles says “vidéo transmition stopped “i downgraded and upgraded firmwares on all the components nothing works ….

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Oscar 22nd June 2020 - 1:03 pm

(Tried to help via email, he’s sending his kit back to DJI for repair)

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James Aiello 3rd June 2020 - 9:27 pm

Hi,
Just got off a ‘help chat’ session on DJI.com. Having just purchased the Mavic Air 2, I was interested in the new fpv goggles and wanted to make sure they would work with the Air 2.

Surprisingly, the tech ‘Verge’ told me that the fpv goggles do not work with DJI drones. Please tell me he’s full of it and they do work with the Air 2?

Any help would be appreciated.

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Oscar 6th June 2020 - 1:05 am

No, the DJI FPV Goggles do not work with the Air 2, or any DJI drones. This is for the FPV Air Units only, which you mount on those racing drones.

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TweakRacer 18th May 2020 - 3:14 am

Oscar, your Zeus35 diagram is wrong. Vista needs to go to TX1 and RX1, because SBUS is using UART2. Had to rebuild because of this. Ugh

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jules 16th May 2020 - 9:06 pm

Is there a way to get the Air unit feed onto the FC and then transmit it through an analog VTX?
Id like to get the best of both world, by having digital for short range and 2.4ghz when going long distance with the same frame. Independant of any interference risk there might be.

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Oscar 3rd June 2020 - 12:40 am

Nope.

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Suzukijim 28th March 2020 - 10:09 am

Hi Oscar, Just want to thank you for your Pairing Remote Controller with Air Unit section here. I have just installed the vista on my diatone R349 which as you know is analogue. Linked goggles ,vista and DJI radio Wired it up to the fc , connected to Betaflight went into receiver settings, all controls working. Set sbus etc. Anyway could not arm with radio. Funny, all receiver sliders in betaflight working.tested motors on motors tab,all working, checked 1000/1500/200, modes tab arming etc. Totally stumped. Anyway after researching for hours I came Across your section here about pairing remote to air unit for Caddx Vista. After reading this article it dawned on me that I was trying to pair air unit receiver to radio not waiting for the air unit light to go green. THEN DO THE PAIRING!
It worked. It goes to show that although even if receiver sliders in betaflight show it’s working doesn’t mean the the radio and receiver are bound. If I had not read your article I woul still be scratching my head THANKS AGAIN!

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