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[Sticky] FrSky R9 MM-FC ONMIBUS F4 V6 868MHz

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frsky x R9MM FC Firework f4 540x400

The FrSky 900MHz/868MHz R9 MM-FC (OMNIBUS F4 V6) uses the MPU6000 over SPI to produce stable flight performance. Integrated with the R9 MM receiver mounted on-board in a protection box. It also features a barometer and AB7456 OSD chip for the Betaflight integrated OSD.


  • R9 MM Receiver
  • STM32 F4 Processor
  • MPU6000 Gyro via SPI
  • BMP280 Barometer
  • Integrated Betaflight OSD
  • 5 UART Ports
  • Direct plugin 3-6S Lipo
  • Built in LC Filter
  • 5V 1000mA BEC
  • 8V 1000mA BEC
  • More caps to reduce gyro power noise


  • STM32 F405 MCU, Runs Betaflight firmware (supported from v3.2)
  • FrSky R9 MM receiver in protection box
  • MPU6000 over SPI Bus
  • 30.5×30.5 mm mounting holes
  • Supports Lipo direct plug-in (3-6S)
  • Supports 5V 1A BEC output (Buck)
  • Supports 8V 1A BEC with LC filter output for the camera and VTX (Buck)
  • STM32 controls OSD chip over SPI in DMA mode (Betaflight OSD)
  • The R9 MM-FC (OMNIBUS F4 V6) supports 3-6s Lipo direct input, and has 5 hardware UARTs

All files relating to the R9 MM-FC ONMIBUS F4 V6 including manuals and firmware updates can be found here:

Posted : 11/04/2019 12:49 pm