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Custom designed flight controller for quadcopters and more.
Cobalt F405 flight controller has the following features:
The flight controller was tested with the Betaflight firmware.
KiCad was used for designing the schematic and the PCB.
Although the STM32F405 is still a good choice for flight controllers today, other more powerful microcontrollers also exist. Betaflight guidlines suggest not using more than 4 motor outputs for STM32F4 or STM32F7 type microcontrollers.
Two layer PCB is fine, however going to a four layer PCB with ground planes inside would reduce electrical noise, which would benefit the microcontroller and the on-board sensors.
Some external peripherals require higher voltage than 5 volts, however cannot accept 25 volts straight from a 6S battery. A 9 volt regulator can be added to solve this issue.
More pads on the PCB would make it more flexible and easier to use in application. Camera and VTx connectors can be moved to more suitable locations and a connector for the radio receiver could be added.
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