So, as I have bought a few RTF sets, I now have couple IR transmitters, an FM transmitter, and two 2.4GHz transmitters.
I also have a TGY9X with the internal DIY FrSky module.
It would be great if I could ditch all the crappy TXs and use my TGY9X to control everything, but as most of the models are micro or mini in size with integrated RXs, changing the RX to for example the V8R4 is not possible.
With some models it might be possible to use the SuperMicro 2.4GHz module and RXs, but that is an expensive solution I really don't want to do.
So the only feasible way is to keep the model intact, and control the original RX with my TGY9X.
Of course, one could just rig a bunch of servos to move the transmitter sticks, but I'm kinda thinking about a more sophisticated way
I'm sacrificing my Syma S110's IR RX first, as the model itself is crap, but the TXs PCB is tiny (S107G for the win!):
3CH mode 4 - Throttle on Left Y, Elevator on right Y, Rudder on right X.
Power: 6xAA = 7.2v to 9v, fed to a 5V regulator
All of the controls are 4.7K potentiometers, with throttle being from 0 to 4.7k, Ele and Rud are 0 Left/Backwards, 2,3k middle, 4.7k Right/Forward.
So, this here is the first idea:
TGY9X ))) V8R4--[x]--TX ))) RX
The [x] here is simple in idea, a circuit that takes the servo PWM data and changes that to a "simulated potentiometer", a DC signal between 0 and 5v.
This is then fed straight in to the pins the TX had its potentiometer.
Pretty easy to do with an Arduino, but I'm not sure how fast it would be.
Using the FrSky RX will make it simpler, as it has dedicated channels, so I don't have to play with the PPM signal from the transmitter.
It could be possible to go through the trainer port, read the PPM data and convert that straight to the IR controls, but the IR data isn't the worlds simplest thing to replicate, so maybe someday.
Now, this is what I thought up one sleepless night.
Someone might have, and probably has, done this much better, if so, information would be nice