The scenario
A drone flight controller based on the STM32F722 MCU with OSD overlay, buzzer alarm, and addressable WS2812 LED outputs, powered from a 4S LiPo via 5V and 3.3V regulators.
What is in this drawing
Read the decisions behind it.
01
Used a 5V BEC and 3.3V LDO to supply the MCU, OSD, buzzer, and LED rails from the LiPo battery.
02
Connected OSD UART to the MCU for configuration and overlay data injection.
03
Drove the WS2812 LED directly from a 3.3V MCU GPIO and tied the open DOUT to a no-connect symbol.
When designing or documenting a Betaflight/STM32F722 flight controller schematic with peripheral power and signal connectivity for OSD, buzzer, and RGB LEDs.
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