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

[Meier Lorenz]

As I mentioned I didn't do the control design, but from what I understood there 
is a good level of the extensions you describe already in place. Else the quad 
would instantly crash on keypress or at least not put it down ;-). But there is 
of course always room for improvement..


Am 23.02.2011 um 00:17 schrieb 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<mailto: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<mailto: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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