Re: [Paparazzi-devel] AoA sensor

Actually I am employing a Mentor Multiplex, and I found the same hall effect sensor, but I am worried about

the size of your sensor and how it affects to the airfoil.

I have though in 2 dynamic pressure sensors attached plus/minus 15º, with 0º at the mean airfoil reference. Hoping that the pressure difference is proportional to AoA (small angles approximation, minor than plus/minus20º AoA actually).

What do you think, have you tested this kind of idea before? It seems mechanically simpler, but I do not know about what performance I will obtain.

By the way, have you any documentation about your experiences with Mentor? I can upload my master thesis applied to it as well. Right now, I am sectioning the airfoil, and horizontal and vertical tails, for applying them a CFD. Do you have experience with this in Mentor?

pd: you can check out this video with my navigation algorithm running in a Mentor, it only shows attitude estimation http://www.youtube.com/watch?v=TRR4Jzz3ZjE&feature=related). My HW is pretty similar to paparazzi classic, but employing atmel at91sam7s256 instead LPC (DMA is a must for me), and I added a SD card as well. Now I have changed to Lisa/L to start with navigation algorithms based on camera vision, but it needs some modifications for fitting my requirements.

On Wed, Jun 8, 2011 at 4:16 PM, Leandro Chelini <address@hidden> wrote:

We've built a AoA Sensor and attached it to a Mentor.
Sensor: US DIGITAL MA3-A10-236-N
It seems like it works. We've only tested it with airy conditions.
The AOA_adc Module you can find at
https://github.com/Bruzzlee/paparazzi/tree/master/sw/airborne/modules/sensors

We've written a documentation, witch includes this theme. But it's in German.
The documentation will being published in the next two weeks.

In your case we use the AoA-Data to control the Pitch-Loop of the Inner-Loop

All modifications and more you can find in:
address@hidden:Bruzzlee/paparazzi.git

Bruzzlee

Am 07.06.11 15:22, schrieb Hector Garcia de Marina:
Hello guys,

I was looking to upgrade my UAV instrumentation and I was thinking to add an Angle Of Attack sensor.

I've found this schematic http://www.charlesriverrc.org/articles/asfwpp/lelke_launch.htm , and it looks interesting but really

I don't know its performance, calibration, etc

Anyone of you are using a "home-made" AoA sensor? , on the other hand, are there cheap ones and light enough for an UAV such as TwinStarII or Mentor?

Thanks in advance,

Cheers

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Héctor
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Héctor

From:	Hector Garcia de Marina
Subject:	Re: [Paparazzi-devel] AoA sensor
Date:	Wed, 8 Jun 2011 17:22:28 +0200