Re: [Paparazzi-devel] Radio module: Lairdtech LT2581 vs XBee Pro (pin compatible)

[Christophe De Wagter]

good enough sensors + good enough model + good enough control + good enough adaptation ...

I think there still exists a set of steering command to send to the acending tech motor controllers such that the quad would play the same song a bit faster... Using a little more intelligence for instance (model [incl key bouncing] + more feedforward terms) and some good learning sessions... I wonder what you will be playing next year at FMA!

-Christophe 

On Tue, Feb 22, 2011 at 8:05 PM, Felix Ruess <address@hidden> wrote:

Hi Lorenz,

nice video! Now we "just" need good enough sensors and estimation to do that without a Vicon System ;-)

I didn't know the Lairdtech modems before, but that sounds promising... Where did you buy them, I only found the dev kit at digikey and mouser...

Cheers, Felix

On Fri, Feb 18, 2011 at 9:34 PM, Meier Lorenz <address@hidden> wrote:

Hi all,

I was wondering if anyone has used the Lairdtech LT2581 outdoors. I've used them indoors extensively, also in Wifi and XBee cluttered environment.

Turns out the Lairdtech modules still get something to the target when XBee and Wifi drop dramatically large packet numbers.

I did the control link for some autonomous quads with them (only the link, the credit for the control design is with the group of Prof. d'Andrea):

http://www.youtube.com/watch?v=ToACDIXTzo0
http://www.idsc.ethz.ch/Research_DAndrea/FMA

I'm asking all of this because the Lairdtech modules are pin-compatible and a drop-in replacement for XBee and we're considering them as outdoor modules instead of using XBee (currently our main module for telemetry, whereas Lairdtech is used for control signals):

http://pixhawk.ethz.ch/wiki/electronics/communication#radio_modems

-Lorenz
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