Hey

Just like that and I won't do it

Can I put two protocols in one flight controller?

Flysky and ELRS ?

Yes, you can connect two receiver to an FC at the same time, BUT, you can't have them both operational at the same time/ The only exception to that is if you are using something like FrSky R-XSR receivers which have a redundancy feature built in whereby you can daisy-chain receivers together so that if one fails the other one will take over control of the aircraft.

Regarding the scenario you are describing, you can connect an ELRS receiver to one UART and the Flysky receiver to another UART, then switch on "Serial RX" for the UART that the receiver you want to use is connected to, making sure that "Serial RX" is switched OFF for all other UARTs. Then make sure the receiver protocol is set correctly for the receiver you have enabled. With this setup you have two receivers connected but only one of them will be operational at any one time and requires you to physically make configuration changes in Betaflight to swap between them.

(28-Apr-2024, 12:20 AM)SnowLeopardFPV Wrote: Yes, you can connect two receiver to an FC at the same time, BUT, you can't have them both operational at the same time/ The only exception to that is if you are using something like FrSky R-XSR receivers which have a redundancy feature built in whereby you can daisy-chain receivers together so that if one fails the other one will take over control of the aircraft.

Regarding the scenario you are describing, you can connect an ELRS receiver to one UART and the Flysky receiver to another UART, then switch on "Serial RX" for the UART that the receiver you want to use is connected to, making sure that "Serial RX" is switched OFF for all other UARTs. Then make sure the receiver protocol is set correctly for the receiver you have enabled. With this setup you have two receivers connected but only one of them will be operational at any one time and requires you to physically make configuration changes in Betaflight to swap between them.

great > thank you prof

Hi Snow,

What about using two UARTS, setting the Serial RX on both, but only powering one 
at a time by using a "switch" (mosfet maybe?) on each one's power lead that could 
be controlled by a switch on the receiver? Would that work?

Although I can't not visualize why one would need this type of set up, I think that
it might actually work. Maybe?

Thanks

Later, iFly  

Maybe one person controls throttle/yaw and the other one controls pitch and roll? Some sort of duality experiment. Sounds like a Star Trek type situation. But could be an interesting thing to do after a couple of beers.

If it was a failover for LR, you'd be better using a 2/3/4G cellular system and sending coordinates to your flight software to navigate. Or setup preset flight routes prior to flying as the failover scenario for Rx Loss instead of GPS Rescue.

And yes, Eyes, you can connect more than one quad to a single transmitter, since that question is likely next. Highly illegal and it doesn't work all that well.

(28-Apr-2024, 01:17 PM)iFly4rotors Wrote: What about using two UARTS, setting the Serial RX on both, but only powering one 
at a time by using a "switch" (mosfet maybe?) on each one's power lead that could 
be controlled by a switch on the receiver? Would that work?

Although I can't not visualize why one would need this type of set up, I think that
it might actually work. Maybe?

Doesn't work. Betaflight only takes notice of the first UART it comes across with "Serial RX" switched on, so if you were to enable "Serial RX" on both UART1 and UART2, Betaflight would only ever look for a receiver on UART1 even if you had a powered on receiver connected to UART2.

(28-Apr-2024, 02:32 PM)Pathfinder075 Wrote: Maybe one person controls throttle/yaw and the other one controls pitch and roll? Some sort of duality experiment. Sounds like a Star Trek type situation. But could be an interesting thing to do after a couple of beers.

If it was a failover for LR, you'd be better using a 2/3/4G cellular system and sending coordinates to your flight software to navigate. Or setup preset flight routes prior to flying as the failover scenario for Rx Loss instead of GPS Rescue.

And yes, Eyes, you can connect more than one quad to a single transmitter, since that question is likely next. Highly illegal and it doesn't work all that well.

Yes, I watched it, thanks for sharing. But the question was: If I have two protocol on one drone, can I do that?

(28-Apr-2024, 02:43 PM)SnowLeopardFPV Wrote: Doesn't work. Betaflight only takes notice of the first UART it comes across with "Serial RX" switched on, so if you were to enable "Serial RX" on both UART1 and UART2, Betaflight would only ever look for a receiver on UART1 even if you had a powered on receiver connected to UART2.

What if you wired two receivers on to the same pads?  So connect say 5V, GND, R1, T1 for both receivers.

(28-Apr-2024, 06:18 PM)Pathfinder075 Wrote: What if you wired two receivers on to the same pads?  So connect say 5V, GND, R1, T1 for both receivers.

That might work, but you might need to make sure the receiver you want to use is powered on before the flight controller tries to initiate communications with it. I don't know without trying, but I'm not really sure what the point of having two different types of receiver installed would be, and you're not going to be able to power one off and then power the other one up to switch between them mid-flight because doing that would trigger a failsafe condition. Just install ExpressLRS and be done with it

FrSky do have their Tandem system which operates simultaneously on the 2.4GHz and 900MHz frequencies where the system will dynamically switch back and forth to using the frequency it determines to be the best during flight so you always have the most reliable connection. It is rumoured that the ExpressLRS team are working on something similar.

(28-Apr-2024, 06:52 PM)SnowLeopardFPV Wrote: but I'm not really sure what the point of having two different types of receiver installed would be

Me neither.  Seems a pointless question tbh.  But it got asked.  But it's one of those questions where it's almost easier to get a soldering iron out and solder two receivers to an FC and see what happens.  Like when you mix two random chemicals together and see what happens (and if you are lucky, survive the experience).

ELRS has Gemini (no idea if that's just BetaFPV's name for the diversity transmitter/receiver system). But GiantAntCowboy mentioned it the other week and he reckoned it made his flights a bit more rock solid on the ELRS side. Guessing you could then mix that with a diversity receiver. Overkill for 99% of pilots.