TINYBEE

This repository contains the hardware design of tinybeef405 flight controller, It supports the latest betaflight firmware currently, you can build your own firmware with the configuration files in the configs directory, see the details below.

I personally use this flight controller board as a hardware platform to learn betafight source code and stm32 microcontrollers, related videos were posted on my Bilibili account.

Hardware and Features

• MCU: STM32F405
• IMU: ICM42688-P
• BARO: BMP280
• OSD: BetaFlight OSD, AT7456E
• Blackbox: 128MiB onboard flash, W25Q128JVSIQ
• UARTS: UART2/UART4/UART5
• SWD: Yes
• Digital VTX: Yes
• LEDs: LED0/LED1
• LED Strip: Yes
• Beeper: Yes
• Boot button: For easy entry into DFU mode

Firmware build and flash

1. Get the latest betaflight source code

$ git clone https://github.com/betaflight/betaflight.git
$ cd betaflight
$ git submodule init && git submodule update --recursive

2. Copy config files

# download tinybee first, and then...
$ cp -r tinybee/configs/TNBF405 betaflight/src/config/configs

3. Build firmware

$ cd betaflight
$ make arm_sdk_install
$ make TNBF405
# wait until make completes its job, you will get:
$ ls obj
betaflight_2025.12.0-beta_STM32F405_TNBF405.hex  main
# "betaflight_2025.12.0-beta_STM32F405_TNBF405.hex" is what you need

4. Flash firmware

   • With Betaflight Configurator properly installed and opened

   • Connect tinybee flight controlelr via usb

   • Enter DFU mode, press and hold the BOOT button, then press the RESET button

   • Go to the Firmware Flasher tab

     

   • Load local firmware then flash firmware

     

5. Basic configurations

   You need to do at least the following setups so that your drone works.

   • Ports: select the right ports for RX and VTX
   • Motors: make sure the order and direction are both ok
   • Modes: how to arm your drone and switch to other modes
   • VTX: analog or digital
   • OSD: analog or digital

   For more information see the betalfight wiki.

   If everything goes well, the final result will be like this:

   

   

Special Thanks

• The original AcciF405 FC Design
• Betaflight Project