Learn how to Setup DJI Distant Controller 3 and O4 Air Unit in Betaflight FPV Drones

For Betaflight FPV drones outfitted with the DJI O4 and O4 Professional Air Models, you may conveniently use the DJI Distant Controller 3 (RC3) with no need a further receiver or radio. On this tutorial, I’ll present you the best way to configure Betaflight to work with the RC3, together with radio-related settings you may alter utilizing DJI Goggles 3 and Goggles N3.

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New to DJI O4? Try my full setup information: https://oscarliang.com/how-to-setup-dji-o4-lite/

Can You Use DJI Distant Controller 3 with Betaflight FPV Drones?

Sure, the DJI Distant Controller 3 (RC3) is absolutely suitable with Betaflight FPV drones when paired with DJI Goggles 3 or Goggles N3. Please notice that RC3 doesn’t work with DJI Goggles 2 and Integra. The RC3 helps DJI O4, O4 Professional, and O3 Air Models.

You should purchase the DJI Distant Controller 3 from:

The RC3 eliminates the necessity for a separate receiver as a result of DJI’s O3, O4, and O4 Professional Air Models function built-in receiver performance by way of an SBUS wire on to the flight controller.

Execs and Cons of DJI Distant Controller 3

You is perhaps questioning in regards to the benefits and drawbacks of utilizing the DJI RC3 in comparison with an ExpressLRS radio:

Execs:

• The RC3 is very compact and transportable—one of many smallest FPV radios obtainable.
• Simplifies your drone construct and lowers total price, as no additional receiver is required.
• Preferrred for micro drones: reduces weight and house necessities, making small builds simpler and lighter.

Cons:

• ExpressLRS sometimes provides higher vary than DJI’s system. DJI’s radio management shares the video hyperlink, that means in case you lose video sign, you additionally lose radio management.
• The minimalist design of the DJI RC3 would possibly really feel restricted for some pilots, particularly these wanting superior options or exact management. ExpressLRS provides a broader vary of radio decisions which are extra highly effective and feature-rich.
• No telemetry obtainable: SBUS is a one-way protocol, that means you received’t get RSSI, hyperlink high quality, or different telemetry data. This isn’t often a dealbraker, as video bitrate on the bottom-right nook of your goggles’ display screen provides a sensible indication of sign high quality. You may also show many telemetry data on by way of Betaflight OSD.

General, for FPV drones that don’t require a number of vary or penetration, the DJI Distant Controller 3 is a wonderful selection—particularly for micro drones benefiting from less complicated, lighter setups.

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Step 1: Backup Betaflight Configuration

Earlier than making massive modifications in Betaflight, at all times again up your present configuration. This ensures you may restore your settings simply if one thing goes improper.

Right here’s an in depth information on the best way to backup and restore your Betaflight settings: https://oscarliang.com/backup-restore-betaflight-config/

Step 2: Confirm If SBUS is Working

1. In Betaflight Configurator, go to the Receiver tab.
2. Beneath “Serial Receiver Supplier,” choose SBUS.
3. Click on Save and Reboot.

Now, return to the Receiver tab and if the web page seems like this, you’re able to proceed to the following step.

Nevertheless, if the channels are clean/empty, this implies SBUS may not be included in your present firmware construct. You’ll then must flash Betaflight once more with SBUS chosen because the Receiver Protocol. To substantiate if that is certainly the case, comply with this information to examine your Betaflight construct choices: https://oscarliang.com/check-betaflight-build-options/

Vital: Be sure to again up your Betaflight configuration earlier than flashing firmware, which generally resets all settings to default. To simplify restoration, think about flashing the identical firmware model presently put in in your FC. Restoring configurations throughout completely different Betaflight variations could not at all times work reliably. Right here’s my full information on flashing Betaflight firmware: https://oscarliang.com/backup-restore-betaflight-config/

Right here’s my tutorial on the best way to flash Betaflight: https://oscarliang.com/flash-update-betaflight/

Step 3: Configure UART Port for SBUS

Decide which UART port in your flight controller is linked to the SBUS wire from the DJI O4 Air Unit. Check with your flight controller’s wiring diagram offered by the producer. It’s easy, if the SBUS wire is linked to RX1, it’s UART1; If the SBUS wire is linked to RX2, it’s UART2, and so forth.

In Betaflight:

1. Navigate to the Ports tab.
2. Beneath the column labeled Serial RX, allow the UART port that your SBUS wire connects to.
3. Disable Serial RX on all different UART ports.
4. Click on Save and Reboot.

Step 4: Configuring the Receiver

In Betaflight Configurator:

1. Go to the Receiver tab.
2. Beneath “Serial Receiver Supplier,” choose SBUS.
3. Click on Save and Reboot.

Step 5: Updating DJI Distant Controller 3

Earlier than continuing, guarantee your DJI Distant Controller 3 (RC3) firmware is up-to-date so it helps the DJI O3 and O4 Air Models, by connecting your DJI RC3 to both the DJI Fly App in your cellphone or the DJI Assistant (Client Drone Sequence) software program in your laptop.

Step 6: Binding the DJI RC3, Goggles, and O4 Air Unit

In contrast to conventional radios that bind on to the drone, the DJI RC3 binds first to your goggles, which act as a bridge to the drone. You should bind within the following order:

1. Bind radio with the Goggles,
2. Then bind goggles with the drone.

First, bind the RC3 to your goggles:

1. Flip in your DJI Goggles 3/N3 and DJI RC3.
2. In your goggles, press and maintain the facility button till it begins beeping (bind mode).
3. In your RC3, press and maintain the facility button till it additionally begins beeping (bind mode).
4. After just a few seconds, the LEDs on each the goggles and RC3 ought to cease blinking and grow to be stable, indicating a profitable bind.

Subsequent, bind your goggles to the DJI O4 Air Unit:

1. Energy in your drone by connecting a battery, you would possibly wish to use a fan to stop the air unit from overheating.
2. Wait till the LED on the O4 Air Unit turns purple. Press the bind button on the air unit; the LED will begin flashing, indicating it’s in bind mode.
3. Place your goggles into bind mode once more by urgent and holding the facility button till steady beeping begins.
4. After just a few seconds, the goggles will cease beeping, and the LED on the air unit will flip inexperienced, confirming a profitable bind.

Step 7: Setting sbus_baud_fast Mode

The DJI O4 system helps a quicker SBUS referred to as “SBUS Baud Quick.” To allow it:

• In your goggles, navigate to Settings → Management → Protocol and choose “SBUS Baud Quick”.
• In Betaflight CLI, kind: set sbus_baud_fast = ON, hit enter, after which enter save.

To disable SBUS Baud Quick:

• Set the goggles’ Management → Protocol again to Normal.
• In Betaflight CLI, kind: set sbus_baud_fast = OFF, hit enter then enter save.

Step 8: Confirm the RC3 Is Working

Test that your DJI RC3 is correctly speaking with Betaflight:

• Go to the Receiver tab in Betaflight Configurator.
• Transfer the sticks in your RC3 controller and make sure that the corresponding channels reply appropriately.

Step 9: DJI RC3 Switches Mapping

At the moment, the DJI RC3 doesn’t permit customized button mapping. Right here’s how every button/change corresponds to Betaflight AUX channels by default:

• AUX1 – M/S/N Mode change (top-left 3-position toggle)
• AUX2 – Prime-right 3-position toggle
• AUX3 – Return-to-Dwelling button (top-left push button)
• AUX4 – Begin/Cease button (top-right push button)
• AUX5 – C1 button (subsequent to neck strap attachment)

Troubleshooting: RC3 Doesn’t Work in Betaflight?

If you happen to’re having hassle getting the DJI RC3 to work along with your Betaflight drone, think about the next points:

• Firmware Replace: Be sure that your RC3 firmware is up to date by way of the DJI Fly app or DJI Assistant to make sure compatibility with the O4 Air Unit.
• Incorrect UART settings: Confirm you’ve chosen the right UART port in Betaflight’s Ports tab.
• Receiver Configuration: Make sure you’ve appropriately chosen SBUS because the receiver protocol in Betaflight,
• SBUS isn’t included within the construct choices: Flash Betaflight once more with SBUS chosen within the Receiver Protocol if unsure.
• Incorrect SBUS Baud: Attempt toggling the sbus_baud_fast setting each ON and OFF in Betaflight and goggles.

Remaining Ideas

That’s the way you arrange the DJI Distant Controller 3 (RC3) with any Betaflight FPV drones outfitted with the DJI O4 Air Unit (Lite and Professional). Frequent binding points sometimes relate to outdated RC3 firmware or misconfigured settings in Betaflight, similar to incorrect UART choice or SBUS baud charge settings. In some circumstances, you would possibly must re-flash Betaflight to put in SBUS receiver protocol as a result of cloud construct choices. Joyful flying.