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The FOXEERF405 described here:

This board use the STM32F405RGT6 microcontroller and have the following features:

  • 1024K bytes of flash memory,192K bytes RAM,168 MHz CPU/210 DMIPS
  • The 16M byte SPI flash for data logging
  • USB VCP and boot select button on board(for DFU)
  • Stable voltage regulation,9V/2A DCDC BEC for VTX/camera etc.And could select 5v/9v with pad
  • Serial LED interface(LED_STRIP)
  • VBAT/CURR/RSSI sensors input
  • Suppose IRC Tramp/SmartAudio/FPV Camera Control/FPORT/telemetry
  • Supports SBus, Spektrum1024/2048, PPM. No external inverters required (built-in).
  • Supports I2C device extend(baro/compass/OLED etc)
  • Supports GPS
  • Supports MPU6000 or ICM20689