I will show you how to setup and use the DJI FPV system for the first time. This tutorial will cover product activation, installation, wiring, pairing between FPV goggles, Air Unit and Remote controller, and 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:
- Banggood: http://bit.ly/2IEwZY2
- GetFPV: http://bit.ly/2IEZ6Gg
- RDQ: http://bit.ly/2M4L7fd
- Amazon: https://amzn.to/2Mr1KR8
Table of Content
- Turning on FPV Goggles
- Installing Air Unit
- Wiring between Air Unit and FC
- Linking FPV Goggles with Air Unit
- Pairing Remote Controller with Air Unit
- Setup Betaflight OSD
- How to Update Firmware
- How to use DJI FPV System
Turning on FPV Goggles for the First time
- 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 to power the Goggles)
- 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?)
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.
Power on the DJI FPV Goggles, then connect 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 Your 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 specifically. Usually it comes with 3D printed parts that would make installing the Air Unit and Antenna so much easier.
If you are upgrading your existing FPV drone, and don’t want to invest in a new frame, check on Thingiverse and see if there are custom designs for your frame. I still use the Martian II frame, and there are already some really nice designs available.
Connection Between FC and Air Unit
If you get a flight controller designed for the DJI Air Unit, you can simply connect them with a ribbon cable, and you can 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.
The Caddx Vista Air Unit 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. But you have to solder your own wires.
* SBUS connection to the flight controller is optional
Make sure your choice of voltage regulator or FC BEC can supply enough current to the Air Unit. The current requirement depends on the voltage as max power consumption is 8W.
- 9V => 0.9A
- 12V => 0.7A
- 16V=> 0.5A
If the BEC on your FC doesn’t meet the voltage or current rating, you could use an external voltage regulator. I use this little voltage-adjustable regulator with good result.
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!
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 are using, enable “Configuration/MSP” in the Ports tab in Betaflight Configurator.
In the Configuration tab, under “Other Features”, enable OSD.
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 made great progress on that. For now the following elements are supported as on Feb 2020.
You can drag the elements around on the preview screen to change their locations, same as the normal Betaflight OSD.
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.
Pairing Remote Controller with Air Unit
If you are using DJI’s remote controller to control the drone, then you need to pair it with the Air Unit first.
Power on the Air Unit and Remote Controller.
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.
How to Update Firmware
How to use the DJI FPV System?
I was going to cover more, but DJI recently published a really well written guide on the basic operations of their FPV system here: https://dl.djicdn.com/downloads/DJI_Digital_FPV_System/20191101/DJI_Digital_FPV_System_User_Manual_EN.pdf
- DJI FPV Goggles: https://dl.djicdn.com/downloads/DJI+Goggles/20181230/DJI_Goggles_User_Manual_EN.pdf
- Caddx Vista Air Unit: https://cdn.shopify.com/s/files/1/0036/3921/4169/files/Usermanual.pdf
Useful Accessories and Upgrades
- Mar 2020 – guide created
- May 2020 – updated OSD setup