Is the FS- iA6B (IBUS port) compatible with SpeedyBee f405 v3?

[agile hamlet]

I keep seeing mixed responses on if it is compatible or not. From what I’m seeing FlySky calls their sbus, ibus. Is this true? Can I connect my FS-iA6B receiver via the iBus Servo plug and then solder my 5v/ground/ sBus (on FC)?

[terse fjord]

it's technically probably compatible but it'll be just about the worst experience ever

[agile hamlet]

Thank you for your info. So it would be better to solder it to the PPM pads?

[boreal halo]

no, that would ACTUALLY be the worst experience ever

the "just about the worst experience" refers mostly to the fact that it's a Flysky and a huge receiver (albeit one of the more reliable ones)

there are many better radios nowadays...

but skipping that point

SBUS is the sPeCiAl one

On F4-based flight controllers, SBUS needs special handling, that's why it gets a dedicated pad.

IBUS can be wired up to the RX side of any free UART.

One thing you MUST keep in mind is the fact that Flysky IBUS receivers don't failsafe properly

I actually explained the solution to the failsafe issue a couple hours ago here in a different channel

the trick is to make the throttle channel drop outside of the normal throttle range when the receiver loses signal
and then teach BF that that out of range value means that it's dealing with a failsafe
It's a bit convoluted...
In Endpoints, adjust CH3 from 100 100 to 120 100
this will make it go much lower than usual
Then, in Failsafe, set the CH3 failsafe to -120 (before, it would only go to -100)
Then, go back to Endpoints and revert CH3 to 100 100

Then, rebind the receiver (it learns the failsafe values during binding)
This will make your throttle range -100 to 100, which is ~1000 to 2000 in BF
but when the receiver failsafes, the throttle will drop to something like 900 (aka -120 on the radio)
then you can tell BF, in Failsafe tab (needs Expert mode) that anything less than 950 = failsafe

Don't have a flyaway like I did.

[terse fjord]

@boreal halo you need to write this up and put it in the faq

[agile hamlet]

I appreciate your detailed response. I’m extremely new. I believe I understand. Currently all the red pads are being used and the green one’s are would want to connect with the iBus servo?

[agile hamlet]

Or should I just buy a new receiver

[terse fjord]

How much are you willing to spend?

because for not too much money you can get an expresslrs transmitter and receiver with all the software everyone uses

and it won't fall out of the air

[agile hamlet]

Do you mean like the radio master pocket ELRS and a compatible ELRS receiver?

[terse fjord]

yeah or rm boxer

[boreal halo]

Not RS, R2