The DJI O4 Pinout Looks Simple. The Voltage Trap Is Not

Quick Answer

The DJI O4 family has three air units. Choose the O4 Pro for 3-inch and larger builds, the 8.2g O4 Air Unit for micros, or the 13.3g O4 Wide for a 159° view.

O4 Pro vs O4 Lite vs O4 Wide

DJI calls the smallest model “DJI O4 Air Unit”; shops often call it O4 Lite. Buy Pro for 3-inch and larger builds, Lite for low mass, or Wide specifically for its 159° view.

Specification	O4 Pro	O4 Air Unit (Lite)	O4 Wide
Weight with camera	Approx. 32g	Approx. 8.2g, or 9.2g with lens mount	Approx. 13.3g
Image sensor	1/1.3-inch CMOS	1/2-inch CMOS	1/2-inch CMOS
Camera FOV	155°	117.6°	159°
Maximum recording	4K/120fps, 10-bit D-Log M	4K/60fps	4K/60fps
Built-in storage	4GB plus microSD up to 512GB	23GB, no microSD slot	23GB, no microSD slot
Input voltage	7.4-26.4V	3.7-13.2V	3.7-13.2V
Antennas	Two, 2T2R	One, 1T1R	One, 1T1R
DJI maximum range with Goggles 3/N3	15km FCC / 8km CE	10km FCC / 6km CE	10km / 6km CE
Best fit	3-inch and larger	2-inch and smaller	Small freestyle builds needing wider FOV

Those are controlled, unobstructed DJI measurements, not practical UK range. Pro’s real advantages are its larger sensor, 4K/120 recording and dual antennas.

DJI O4 Pinout: Wire Power Before the UART

The search term “O4 Lite pinout” hides the expensive part of this job: Pro and Lite do not share the same safe supply range. Identify the air unit first, check the flight controller’s BEC label and power rating, then solder. Never choose a pad just because its plug fits.

Model	Input voltage	Minimum BEC output in DJI’s manual	Practical connection
O4 Air Unit (“Lite”) / O4 Wide	3.7-13.2V	10W; DJI gives 5V/2A as its example	Use a verified 5V/2A-or-better rail, or another regulated supply inside the stated range. On 1S, keep power wiring short and confirm the voltage stays above 3.7V under load.
O4 Air Unit Pro	7.4-26.4V	13.5W; DJI gives 9V/1.5A as its example	Use a verified 9V/1.5A-or-better rail or another supply inside the stated range. A 5V pad is below specification.

DJI’s six-wire cable order is red, black, white, grey, brown, yellow. Follow the wire colours and the labels on your own flight controller rather than copying a connector drawing from another board: manufacturers do not use one universal plug orientation.

O4 wire	DJI signal	Connect to the flight controller	Needed when
Red	VCC	Verified power rail for the exact O4 model	Always
Black	Power GND	GND beside the power pad	Always
White	O4 UART RX	FC UART TX used for Canvas Mode	Betaflight OSD
Grey	O4 UART TX	FC UART RX on the same UART	Normally connect with white for the full serial link
Brown	Signal GND	GND	Serial/control connection
Yellow	S.Bus / DJI HDL	FC S.Bus pad	Only when using the matching DJI FPV Remote Controller; leave it unused with a separate ELRS receiver

The UART crosses: O4 RX goes to FC TX, and O4 TX goes to FC RX. That single detail answers most “video works but OSD does not” wiring checks. A GOKU F405 HD 1S 12A AIO or regulated HGLRC O4 BEC can simplify power, but verify the selected output against the model and total load rather than treating an “O4” label as proof.

Activation and Betaflight OSD Setup

1. Remove the propellers. Power the air unit and connect its USB-C port to DJI Assistant 2 (Consumer Drones Series).
2. Activate the unit and update the air unit and goggles to compatible firmware. An unactivated O4 is limited to 20mW or less and restricts goggle menu access.
3. Link the goggles and air unit using their link buttons.
4. In Betaflight Configurator 4.4 or later, open Ports and set the wired UART’s Peripherals option to VTX (MSP + DisplayPort), then save and reboot.
5. Arrange the Canvas Mode elements in the OSD tab and confirm they appear in the goggles before refitting props.

O4 is not detected automatically. If video works but OSD does not, check the crossed RX/TX wiring and UART setting first.

Which Goggles Work with DJI O4?

Goggles	O4 support	Matching DJI controller	Racing Mode
DJI Goggles 3	Yes	FPV Remote Controller 3	Yes
DJI Goggles N3	Yes	FPV Remote Controller 3	Yes
DJI Goggles 2	Yes	FPV Remote Controller 2	No
DJI Goggles Integra	Yes	FPV Remote Controller 2	No
DJI FPV Goggles V1 or V2	No	Not applicable	No

Goggles 2 and Integra work with O4, but Racing Mode requires Goggles 3 or N3. ELRS also works as a separate control link. See our Goggles 3 vs N3 comparison.

Troubleshooting O4 Wiring and Setup

Symptom	Check first	Why
No power	Measure the selected BEC pad with a multimeter, then compare its voltage and power rating with the model-specific table above	A labelled 5V rail is below the O4 Pro input range, while an overloaded rail can collapse under load
Video works but no Betaflight OSD	Confirm white O4 RX goes to FC TX, grey O4 TX goes to FC RX, and that exact UART is set to MSP + DisplayPort	Power and video linking do not prove that the serial path is correct
Will not activate or update over USB-C	Power the transmission module from the aircraft or a correctly rated supply as well as connecting the USB-C data cable	DJI specifies that the air unit must be powered for activation
Will not link	Activate the devices, update compatible firmware, then repeat the link-button sequence	An unactivated unit has restricted functions, and mismatched firmware can block setup
Dropouts after installation	Inspect the U.FL connections and keep each antenna clear of carbon, metal, camera and transmission module	DJI specifies at least 5cm separation from the video transmission and camera modules

Our video troubleshooting guide covers link faults; our analogue vs digital comparison covers system choice. Replacement O4 Pro antennas are available separately.

Also browse VTX and camera combos, FPV goggles, the Flywoo 155° camera and O4 FOV extender kit.

FAQ

Does DJI Goggles 2 work with the O4 Air Unit?

Yes. DJI Goggles 2 and Goggles Integra support the O4 family when compatible firmware is installed. They pair with DJI FPV Remote Controller 2, but they do not enable O4 Racing Mode.

Can DJI O4 Pro run from a 5V pad?

No. DJI specifies 7.4-26.4V for O4 Pro. Use a supply inside that range; a suitable 9V BEC rated for at least 1.5A is a practical choice.

Why do I have video but no Betaflight OSD?

The usual cause is the UART, not the camera. Cross O4 RX to FC TX and O4 TX to FC RX, then set that UART to VTX (MSP + DisplayPort) in Betaflight Configurator.