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Omnibus F4 Flight Controller Guide

Right now many agree that the Omnibus F4 series is one of the best F4 flight controllers you can buy for the money. There where a few issues with the first few versions, but since V4, they now work flawlessly and this is the flight controller I recommencement to everyone. Unless you are a seasoned veteran of FPV racing scene, using an omnibus can be daunting as there is not much documentation. This guide will try to clarify everything.

This article is currently written for the omnibus F4 V5 flight controller, but a lot of the information is still applicable to some of the older boards, but don't waste your time buying any of the older (or clone) boards as anything before V4 has some hardware issues that will ultimately result in the board breaking.

Omnibus-F4-V4

What is in the guide

Omnibus F4 V5 Pinout

omnibus-f4-v5-pinout2

Powering your Omnibus F4

The omnibus F4 V5 can be powered directly from your flight battery (2s-6s) since the built-in regulator will convert the voltage down to 5V. However, if you prefer you can also power it via a cleaner direct 5V power supply. This is helpful if you have particularly noisy motors that cause a lot of interference on the circuit.

Powering directly from battery

The most common method to power the omnibus is direct via the battery supply. The board (version 5) can handle up to 6S Lipo voltage directly on the Vbat pin on J5 as shown below.

Wiring-F4-v5-power-1

Here we have used a PDB, as most of us will be using this FC on a quadcopter.

Don't get confused with the Vbat (video battery) pin on J3, as if you connect your battery voltage to this you can fry your board or FPV gear. See RAM Power section below.

Powering from typhoon 4in1 ESC

If you are using the Typhoon 4in1 ESC you can directly connect this to the JST-JH connector (J10) as shown below. The only thing you should take note of is the solder jumper to choose between the current sensor or ESC telemetry. More on the solder jumpers later in this guide.

Powering from 4in1 ESC using current sensor

This configuration lets you use the built-in current sensor on the typhoon 4in1 ESC (or any other 4in1 ESC that has a current sensor).

OMnibus-F4-Typhoon32-ESC-1

Powering from 4in1 ESC using ESC Telemetry

The typhoon 4in1 ESC supports ESC telemetry (BLheli32), so if you want to use this you need to change the solder jumper

OMnibus-F4-Typhoon32-ESC-telemetry-1

Connecting your receiver

Connecting your receiver to the omnibus is not much different from any other flight controller. You connect your serial receivers (SBUS, IBUS) and PPM receivers to the pin on J7 which corresponds to UART6. To connect a Spektrum receiver this connects to the dedicated Spektrum satellite connector on J8 (corresponds to UART1)

omnibus-f4-receiver-connection-1

SBUS-Receiver-Config-1

With the latest version of the omnibus, the software will automatically change the SBUS/PPM pin depending on what receiver type you select within betaflight. You don't need to remove any resistors or change any solder jumpers (like you did on the older versions of the omnibus).

Inverted and non-inverted SBUS

SBUS J7 on omnibus

  • SBUS/PPM (J7) header (uart6) This is for inverted signal receivers; has fixed inverter that cannot be turned off (by CLI command sbus_inverter=on/off)
    RX1 (on J2) (uart1), These are for non-inverted signal receivers.

Spektrum DSM
All of the omnibus boards have a dedicated Spektrumconnector which has the signal, 3v supply and ground as needed for your Spektrum satellite receiver.
DSM connector (on J8). This is for non-inverted signal receivers and is equivalent to RX1.

Omnibus Solder Jumpers (J16 and J20)

The omnibus has some solder jumpers, the jumpers on J16 and J20 allow you to select between the current sensor, or ESC telemetry or to output 5V on the servo rail.

Power source Selection Jumper J20

J20 allows you to enable 5V output or ESC telemetry on the servo rail. This is ideal if you are flying a fixed-wing plane and want to power your servos from the omnibus. If you are flying a quadcopter using BLheli32 ESC, then you will want to enable telemetry on the servo rail.

J20-solder-jumper-omnibus-F4

ESC Telemetry Selection Jumper J16

J16 is used when you have a 4in1 ESC connected to your omnibus. This solder jumper lets you select between ESC telemetry or current sensor input to the omnibus for a 4in1 ESC.

J16-solder-jumper-omnibus-F4.png

Connecting your FPV Gear

The most important thing to consider when connecting your FPV gear to the omnibus is that the video line from the FPV camera goes to the Vin, and Vout form the omnibus goes to the VTX.

An example of how to connect your FPV gear is shown in the diagram below. If you are using a PDB with a regulator (or LC filter) built in. Then it is best to power your FPV gear directly from there to ensure it has the cleanest power supply.

Wiring-F4-v5-FPV

RAM solder jumper J4

This solder jumper allows you to choose what voltage to supply to your FPV gear on the RAM pins. These are used if you are powering your FPV gear directly from your omnibus (or if you don't have a PDB with a regulator).

RAM-solder-jumper-omnibus-f4-v5

Using Smart Audio / BFCMS / Tramp VTX

Since the omnibus has a built-in betaflight OSD, then it makes sense to use a VTX that supports telemetry. This lets you easily change the channel or power level directly via your R/C controller.

The VTX will simply connect to the spare UART1 TX port and you need to enable the appropriate telemetry protocol on the ports tab within betaflight. For more information check out our VTX telemetry guide.

Any questions?

I have not covered everything in this guide, so if something is not clear, or you want me to explain anything specific (like connecting an RGB LED) just ask and I can get that added.

Thanks for reading, if this guide helped you please share it with your friends or consider buying something from the links on our blog as we get a small commision to help fund this site!

Alex

Alex

I started this blog to share tips, and my thoughts about this exciting hobby for multirotors and UAV's. I also run Unmanned Tech UK. To visit click the shop button on the top of the page :-)

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