F3 flight controller as SBus decoder? - RC Groups
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Nov 05, 2017, 12:36 PM
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F3 flight controller as SBus decoder?


Hi there,

I can find three kinds of SBus-to-PWM decoders out there: Futaba ones with 3 channels that cost a fortune, FrSky ones with 4 channels that cost a fraction but still too much relative to most servos I use on planes up to about 1.5kg AUW, and DIY ones from China that give 16 channels for the price of the FrSky one.

What I'm after, however, is a 3-4 channel type that costs a quarter of the DIY ones and is a quarter of its size. I came across a bunch of F3-based flight controllers (for multirotors) that you can get for $6-7 each from China. Now these usually have at least 4 PWM outputs and take their input from SBus or CPPM. I guess you could set up their controller such that they simply pass selected channels from SBus to the PWM output pins, which is just the SBus-to-PWM converter I'm after: cheap and very small, yet including the microUSB connector for programming, so no channel changer required.

Has anyone tried this approach? Are you happy with it? What are the pitfalls?
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Nov 05, 2017, 06:15 PM
Quad Erat Demonstrandum
scousethief's Avatar
Im sure you can now remap resources inside Betaflight to control most things so 4-8 motors can become 2 motors and 6servos or anything inbetween.

Atm i am repurposing cheap brushed f3 controllers to control 2 brushed motors and 3 servos or 1 brushless motor and 3 servos , so far everything works fine and i can use any input method from a standard receiver with pins to a no pin 8ch ibus receiver the size of a postage stamp.

The upside with the brushed motors is that i get a Flight controller which can run 2 motors directly for differential thrust and 3 or 4 servos all from one small board or i can run brushless just by adding an esc.


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