BrainFPV RADIX LI F4 3-6S Flight Controller Graphical OSD 20x20mm

  • $82.00

BrainFPV RADIX LI F4 3-6S Flight Controller Graphical OSD 20x20mm 

The BrainFPV team have squeezed your favorite flight controller down to 20x20. Everything you love about RADIX just got smaller and cuter.


  • On top of the normal Betaflight OSD, RADIX LI on-screen-display gives you extra features you can't get anywhere else. Proudly show off your pilot and team logo using the BrainFPV logo customizer with just a click of a button. Extra features also include a graphical barometer scale, artificial horizon, gyro spectograph, RC stick display, 3D OSD support and more!
  • RADIX LI can be used with any 4-in-1 ESC on the market. It comes with cables and connectors to easily make your own wiring harness. 
  • Smaller! (duh): 20mm hole spacing, 26.5mm x 26.5mm outside dimensions
  • Has 5V Reg! Can be powered directly from a 3S - 6S LiPo battery (500mA BEC built-in)
  • No Baro! You can attach a GPS to it if you want to know how high you are
  • No Micro SD Slot! Who needs blackbox if you can use the custom BrainFPV OSD spectrograph for tuning?
  • No Analog RSSI Input! Using RSSI or LQ over an RC channel is more common and more accurate anyways.
  • So Ridiculously Cute! It is just cuter. Nothing more to say.


BrainFPV RADIX LI 20x20 Flight Controller w/ Graphical OSD for Sale


  • Processor: STM32F446RET6, Coretx-M4, 32bit, 180MHz, 128kB RAM, 512kB Flash.
  • IMU: Bosch Sensortec BMI160 running at 3.2kHz, connected using SPI.
  • OSD: Full-graphic, PAL/NTSC auto detect, adjustable black and white levels. Full Betaflight OSD support with extra graphical features. Support for side-by-side 3D when used with a 3D FPV camera.
  • Motor Outputs: 6 outputs with full DSHOT (150/300/600/1200) and OneShot support.
  • Receiver Support: PPM, S.Bus (inverter built-in), DSM, HoTT,  SRXL, CSRF, FPort ready. 5V or 3.3V supply for receiver. Receiver is powered from USB for easy and safe setup.
  • Telemetry Support: FrSKY Smart Port, FrSKY Sensor Hub, HoTT Telemetry, SRXL, CSRF, FPort ready. Built-in inverter for FrSKY telemetry.
  • Serial Ports: 4 full serial ports (UARTs). UART3 and UART6 have inverters for S.Bus and SmartPort telemetry. Inverters are automatically enabled/disabled for maximum flexibility. 
  • RGB LEDs: Dedicated RGB LED output.
  • Buzzer Port: Dedicated port for 5V (100mA max) buzzers.
  • Analog Inputs: Voltage sensing  (VBAT), current input (3.3V max).
  • Power: 3S - 6S (7.5V - 26V), 500mA BEC
  • Dimensions: 26.5mm x 26.5mm, 20mm hole spacing. 4.1mm holes for Anti-vibration grommets for M3 screws.
  • Weight: 4g
  • Gluten free, Non GMO, Free Range Anorganic Gyro



  • 1x RADIX LI 20x20 Flight Controller
  • 4x Silicone Anti-Vibration Grommets
  • 1x BrainFPV 4-in-1 ESC Cable Kit (cables and connectors to make a cable that works with any 4-in-1 ESC with a JST-SH 7 pin, 8 pin, or 10 pin connector)