
Overview
The KISS ULTRA v3 is a flight controller built around the STM32H743 processor and a 30.5 x 30.5 mm mounting pattern. It combines an IIM-42652 SPI gyro, BMP390 barometer, USB-C connectivity, integrated graphical OSD, current sensing, and support for up to 8 motors using DSHOT2400/1wire.
The board uses an 8-pin ESC connector with backward compatibility for KISS systems and includes additional solder pads for motors M5-M8. It is not compatible with FETTEC systems. Separate power paths are provided for LiPo and USB, with 5 V and 12 V BEC outputs.
Key Features
- STM32H743 processor running at 480 MHz with 2 MB FLASH and 1.28 MB RAM
- IIM-42652 gyro connected through SPI and integrated BMP390 barometer
- 30.5 x 30.5 mm mounting pattern in the KISS H form factor
- 8-pin KISS-compatible ESC connector with current sensor pin
- Additional solder pads for motors M5-M8
- Overcurrent protection on data lines and ESD protection on USB
- USB-C connection with separate LiPo and USB power paths
- BLHELI Passthrough, IRC Ghost, TBS CSRFv3, and DSHOT router support
- Up to 8 motor outputs with DSHOT2400/1wire
- GPS support using the UBX protocol and improved return-to-home support with barometer data
- Support for DJI MSP, DJI WTF, DJI O3, Walksnail, and HD0 video systems
- Analog camera control using a DAC
- Battery capacity monitoring and alerts
- No soft serial ports; 7 serial ports are exposed, including dedicated serials for SA and RC telemetry
- Integrated graphical OSD with 50 fps refresh rate and no serial port requirement
- OSD adjustment for black level, white level, and transparency
- Full KISS configuration and ESC configuration through the OSD
- Crossfire tools, AM32 setup tools, and hardware test tools for RC, GPS, video, and motors
- Web GUI available without installation and native Apple Silicon support
- Smart configuration storage and optimized hardware interface and adaptive filter code
Specifications
| Product type | Flight controller |
|---|---|
| Model | KISS ULTRA v3 / FCFC ULTRA v3.0 |
| Processor | STM32H743, 480 MHz |
| Memory | 2 MB FLASH; 1.28 MB RAM |
| Gyro | IIM-42652, SPI |
| Barometer | BMP390 |
| Mounting | 30.5 x 30.5 mm |
| ESC connector | 8-pin, backward compatible with KISS; not compatible with FETTEC |
| Serial connectors | 2 x 6-pin connectors: SER1 and SER3 |
| Serial ports exposed | 7 |
| Motor outputs | Up to 8 motors; DSHOT2400/1wire |
| BEC outputs | 5 V and 12 V, 2 A |
| Battery input marking | Maximum 6S |
| USB | USB-C with ESD protection |
| OSD refresh rate | 50 fps |
| Current sensing | Dedicated current sensor pad and ESC connector current sensor pin |
Applications
The flight controller is intended for KISS-compatible multirotor builds requiring configurable serial connectivity, ESC telemetry, current sensing, GPS functions, analog video control, OSD configuration, and support for the listed HD video systems.
What's Included
- KISS FCFC Ultra v3 flight controller
- 8-8 cable
- 8-6 cable for legacy connections
For product support, contact RCDrone customer service.
Abbreviations
- KISS: Keep It Super Simple
- FCFC: Fedor Commander Flight Controller
Details

Connector and pad labels map the board's power, serial, video, telemetry, and motor interfaces for installation.


Dedicated pads identify the ESC, current sensor, telemetry, and M1-M8 motor connections for wiring.