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Re: [Paparazzi-devel] Choice of Autopilot hardware surprisingly dificult

From: Simon Wilks
Subject: Re: [Paparazzi-devel] Choice of Autopilot hardware surprisingly dificult
Date: Fri, 6 Jan 2012 09:15:24 +0100

Hi Tilman,

If you want to go the Lisa path then you can get a Lisa/M at I just received mine a few days ago from them and have it up and running. I am not using it for fixedwings though. For that I have TWOG and Yapa which I can thoroughly recommend, especially the later. Both of these you can pick up from, though almost everything seems to be out of stock at the moment.  

Some people have reported using, or at least preparing, Lisa for fixedwing use but if you want to be on the safe side you might just want to start out with the cheaper and proven TWOG/Yapa type platform. Everything you use with this (XBee, GPS, etc. and even the majority of your airframe config which will need to be tuned to your aircraft independent of the platform you will choose) can be moved across to the Lisa/L (should it ever become available again) or the Lisa/M.

Regarding the Overo, if weight or space isn't too much of an issue then you probably could get a tobi board (or another smaller expansion board for the overo) and connect it to the Lisa/M via SPI etc. and it might work the same way. A little messier but should go and gives you access to more of the overo ports depending on what you want to do.

An alternative solution for your Spektrum/UART/Telemetry concerns would be to use the standard receiver module and go via the PPM decoder board.


On Thu, Jan 5, 2012 at 11:37 PM, Tilman Baumann <address@hidden> wrote:
It's winter and hobby and tinkering time. And now after some life changes which kept me from going ahead with paparazzi I would like to get my gear up ready for spring.

I always wanted to build a Lisa/L based system. I liked the system design and extensibility.
Especially the idea of piggybacking a Linux system in the air and possibly UDP/Wifi telemetry as well...

But I thought I should change my mind about that due to the dubious Lisa supply situation and the fact that Lisa/L is clearly not what I need to start with.
The first limitation seems to be the number of UARTs. Seems like I loose two right away for the Spektrum satellites. (Can GPS or Telemery be connected via
And I'm not sure if Spektrum limits me to the STM32 platform anyway. The code is in the STM arch area, but I have not really investigated that.

I seem to be coming back to Lisa. Or Lisa/M actually since the form factor is much more beneficial for a fixed wing which I like to build.
Lisa would be my dream platform. But what use is it if I can't buy it.
I would rather buy something now, but really I'm lost. Perhaps I'm too focused on detail. Can someone give me some hints about what I could consider for a IMU and Spektrum-RC based solution based on hardware that I can actually buy?

Sorry, lot's of talking. But the more I clicked through the wiki I got confused and concerned today. And I thought it would be easy to just buy something else then Lisa and get going.

Thanks and sorry for the ramblings

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