An ST development board based on the STM32F405RGT6/STM32F405RG (Clock: 168MHz, Flash: 1024Kb, Ram:194Kb) MCU (LQFP-64) compatible with STM32Duino (Arduino).

• RBOARD_F405RGT6 it's the variant board for the STM32 Arduino Core.
• rSTM32F405RGT6_B it's the KiCAD 5.1.2 project.
• rSTM32F405RGT6.schematic.pdf the schematic.

• This requires the STM32 core for arduino, the ST original.
• I used this guide to add the board, you can check it or continue with my suggestions to install the new board.
• Copy the "RBOARD_F405RGT6" folder to the Arduino "variants" folder, in win7 is located at: c:\Users\<USERNAME>\AppData\Local\Arduino15\packages\STM32\hardware\stm32\1.8.0\variants
• Edit the "boards.txt" file, in win7 is located at a lever up than the "variants" folder, search for the Generic F4 board line and add the lines to leave it as I show you next:

# Adafruit Feather STM32F405 board
GenF4.menu.pnum.FEATHER_F405=Adafruit Feather STM32F405
GenF4.menu.pnum.FEATHER_F405.upload.maximum_size=1048576
GenF4.menu.pnum.FEATHER_F405.upload.maximum_data_size=131072
GenF4.menu.pnum.FEATHER_F405.build.board=FEATHER_F405
GenF4.menu.pnum.FEATHER_F405.build.product_line=STM32F405xx
GenF4.menu.pnum.FEATHER_F405.build.variant=FEATHER_F405


# STM32F405RGT6 STUnoPlus board
GenF4.menu.pnum.RBOARD_F405RGT6=STM32F405RGT6 STUnoPlus
GenF4.menu.pnum.RBOARD_F405RGT6.upload.maximum_size=1048576
GenF4.menu.pnum.RBOARD_F405RGT6.upload.maximum_data_size=131072
GenF4.menu.pnum.RBOARD_F405RGT6.build.board=RBOARD_F405RGT6
GenF4.menu.pnum.RBOARD_F405RGT6.build.product_line=STM32F405xx
GenF4.menu.pnum.RBOARD_F405RGT6.build.variant=RBOARD_F405RGT6

(add after the "# Adafruit Feather STM32F405 board" section).

That's all.

So on the arduino IDE, on the boards menu pick the option "Generic STM32F4 series" and the board part number: suboption pick the "STM32F405RGT6 STUnoPlus" option.

Note: while adafruit board and mine use the same MCU there are not compatible variants: adafruit uses a 12mhz external crystal, mine uses an 8mhz.

Front

*I submerge the boards on a painters solvent bath to clean the flux residue which I haven't any problem until the DC jack came, as you see, didn't took the solvent bath kindly :P

Back

*The footprint for the second crystal (Y2) was wrong on this board but it's already corrected on the KiCAD files.

The STUno+ running the Adafruit ILI9341 library over hardware SPI.

Video in progress...