Comment by David Hamm on August 16, 2012 at 5:59am

That's outstanding!!!  Good work! What OS are you using on the PC?  

Comment by Charly0188 on August 16, 2012 at 10:54am

currently it is running on linux, but as it uses the SDL library which is also available on windows, it should work.

The only thing to modify is the system calls to send the serial command to the arduino. But I guess it could be done using a library in order to be portable.  

Comment by David Hamm on August 16, 2012 at 6:01pm

Let's see... If you sent the commands to a library you could also send them via TCP. Then if there was an app to send an FPV video stream back to the joystick user one could FPV across the Internet, on the other side of the world.

Just a thought....

Comment by Les LaZar on August 16, 2012 at 6:47pm

One problem with trying to do closed-loop control of an R/C device through a computer, specifically with a video image telling the operator what the plane/copter/robot is doing is the signal lag.  I have attempted this with standard utilities (cYoucMe, videoLAN) and experience delays of 300ms to 800ms in the video return link.  It is difficult to impossible to control something that requires real-time reactions with such delays in the loop.  If you are just observing, that is fine...who cares if the image you see happened a second ago?  But if you are in control of a moving device, in that second, it ran off the cliff or into the wall.  Bummer!

 

Comment by David Hamm on August 16, 2012 at 6:58pm

Yup, while reading your response I remembered rc tx every 20ms. If it takes 30ms to ping google then the commands to avoid a crash will come in just after impact.

Comment by Charly0188 on August 16, 2012 at 11:04pm

@ Les LaZar

Actually if you use vlc to stream from your video receiver you can tune the buffer. By default it is at 300ms but you can turn it down to 5ms so it looks real time for you. Moreover I an not flying manual while in FPV, I made a small autopilot based on a standalone arduimu. here is the video of it: http://diydrones.com/video/arduimu-based-fpv-system

It has a low pas filter on the pilot input while the control loop is running at 20Hz, so I think that is perfect for fpv!

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