I want to make RC "jet" with working landing gear and landing gear door, jet in question is Soko J-22 Orao. I have most of ideas on mechanism, but idfk how to do electronics.
And id like to use this controller, from this tutorial:
So id like landing gear and its door to extend/open and Ive tought of using 180 degre servos for the job, something like this:
Now the tricky part is that, the above seen controller has only 6 channels. And even if it had more, contolling all servos would still be still headache.
So my question is - Is there module, board, device, ANYTHING literally that can control more electronc devices from single channel/input.
It needs to, on receive signal, open landing gear doors, extend landing gear and then wait for next (same) input to do reverse of that.
And is something like that even possible?
Thanks in advance!
Um, yes, an Arduino, of course! You send the PWM signal FROM the RC Transmitter channel of your choosing into the RC Receiver, pass that signal INTO an Arduino, manipulate the signal as needed in your Arduino sketch, and send the modified signal (or even the same signal) OUT of the Arduino on multiple channels to your servos.
You will need to supply power externally on some voltage regulator (buck converters work well) to the servos, just the yellow/orange signal wire will go from the Arduino to the signal in on the servos. Don't forget to connect ground from your power distribution (buck converter, voltage regulator, whatever) to the Arduino as well or it won't work.
I’m building RC plane, and I’d like to add retractable landing gear.
The receiver I’m using has 6 out(put) channels. Most of them are reserved for control surfaces such as ailerons, rudder and elevator; and with motor that only leaves one out, an two position switch.
I’d like to make landing gear doors open and gear go down, and reverse of that.
So my question is:
Is there a way to control multiple servo motors independently from each other from the same board/device, and make them perform timed actions/tasks?
I’ve heard you can use arduino for this but I’d like to know if there’s any other way. Thanks!
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Sure, there are lots of ways, but an Arduino can mimic any of those solutions for less cash and/or less complexity. For example, you could buy a radio set with more channels. Six isn't a lot in RC planes if you want more than basic functions. I had a Spektrum DX6i and I ended up with the same issue as you. So I bought a DX8 TX/RX set and it had enough for my purposes. I recently acquired an RC Humvee that comes with 18 channels.
You could buy a device from the hobby shop that does that, I used to run the now obsolete Arducopter for my hexacopter drone which was a purpose made Arduino Mega to allow various flight behaviors to occur based on the barometer, gyro and compass and different setpoints on the Spektrum radio switches and dials. In your previous post, you showed a video of a radio and device and the device looked like an Arduino Nano to me. I recommended the Arduino Nano Every to you as any off the shelf solution is just a microcontroller of some sort anyway, might as well use Arduino since they're awesome.
Last RC project I used a Nano Every was just as I described to you previously, take the raw RC signal and manipulate it to your needs. Adding delays to the various channels isn't too difficult even for beginners, just a few lines of code.
That hexacopter was recently disassembled for my GI Joe airboat, custom control courtesy of Arduino.
So in summary, yes there are ways apart from Arduino but keep in mind that Arduino was invented specifically for folks like you and I to get our ideas up and running relatively quickly as compared to anything available prior.
Thanks man, that was incredibly useful!
I think of using that one channel as a two-way switch control (so basically on/off), then connecting that channel/sending that signal to either Arduino Nano or Uno, and then using the PCA9685-II2C Servo Driver to control servos. It shouldn't be that hard to add a bunch of delays and make it wait for the next input. And I guess that should solve my problem! I'm new to this, but it doesn't look too hard to do!
Thanks man, really really thank you!
These stuff is sold as "servo sequencer", you can google and see what others make use of it. Most off-the-shelf have a simple configuration language built in, so you might want to consider that, too, when you implement your own thingie.
Have a look at some RC projects - mechanically the doors are often linked to the undercarriage links so one servo can open the doors and drop the legs .
The linkage needs to go “ over centre “ as a servo with not support the landing forces trying to close the under carriage .
You can buy pneumatic legs that can work off a single servo
