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Today's Topics:
1. Antenna tracking updates? (Tom Apker)
2. Tracker for antennas (Rui Costa)
3. Re: FBW and AP... (Alexis Lussier Desbiens)
4. Re: FBW and AP... (Pascal Brisset)
5. Re: Paparazzi-devel Digest, Vol 43, Issue 5 (David Conger)
6. RE: Re: Paparazzi-devel Digest, Vol 43, Issue 5
(address@hidden)
7. AW: [Paparazzi-devel] Re: Paparazzi-devel Digest, Vol 43,
Issue 5 (Ethan Arnold)
----------------------------------------------------------------------
Message: 1
Date: Thu, 11 Oct 2007 14:09:52 -0400
From: "Tom Apker" <address@hidden>
Subject: [Paparazzi-devel] Antenna tracking updates?
To: address@hidden
Message-ID:
<address@hidden>
Content-Type: text/plain; charset=ISO-8859-1
Group,
Has there been any progress on Jeremie Vacher's antenna tracking
project? My lab has recently started collaborating on a much more
ambitious project that will, hopefully, involve multiple aircraft
flying semi-random paths. While we could use teams of undergraduates
with yagi's, it would be nice to automate the process. Plus, we
wouldn't want to give the local duck hunters any ideas.
I have a little antenna-pointing experience myself if the project
needs some help, although I don't want to promise much.
Thanks,
-Tom
------------------------------
Message: 2
Date: Thu, 11 Oct 2007 20:05:36 +0000
From: "Rui Costa" <address@hidden>
Subject: [Paparazzi-devel] Tracker for antennas
To: address@hidden
Message-ID:
<address@hidden>
Content-Type: text/plain; charset="iso-8859-1"
Where can I find the contact of Jeremie Vacher, a student at ENAC? I
need
informations about his tracker for antennas. I would like to develop
one.
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Message: 3
Date: Thu, 11 Oct 2007 16:50:19 -0700
From: "Alexis Lussier Desbiens" <address@hidden>
Subject: Re: [Paparazzi-devel] FBW and AP...
To: address@hidden
Message-ID:
<address@hidden>
Content-Type: text/plain; charset=ISO-8859-1
Ok... I found that I have issue much sooner than that! I tried to
enable the "debug" mode on the FBW by adding the line <define
name="TELEMETRY_MODE_FBW" value="1"/> in my airframe file. But I think
I don't put it in the right section because it is not doing
anything...
Anyway, I added the PPM signal to the "default" mode and I only get
0,0,0,0,0... Can someone tell me which file I should look at to make
it work? Because right now... it doesn't seem to do much!
Thanks!
Alexis
On 10/6/07, Pascal Brisset <address@hidden> wrote:
Hi Alexis,
Alexis Lussier Desbiens wrote:
Hey,
I got a really stupid question... how do you switch between FBW mode
and AP mode in paparazzi? Is it over the serial link? With the RC
controller?
Terminology: FBW and AP are processes, not modes. FBW handles the RC
reception and the servo commands while AP handles ... the rest. On a
dual processor board, these processes are distributed over the two
CPUs.
On a single processor board (e.g. the Tiny), these processes are only
logically splitted.
The current implemented "modes" are MANUAL, AUTO1, AUTO2, HOME and
NOGPS. The MANUAL mode is implemented in the FBW process. All the
other
modes require FBW and AP.
--Pascal
Alexis
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--
http://mecano.gme.usherb.ca/~alussierdesbiens
"De' remi facemmo ali"
------------------------------
Message: 4
Date: Fri, 12 Oct 2007 07:26:52 +0200
From: Pascal Brisset <address@hidden>
Subject: Re: [Paparazzi-devel] FBW and AP...
To: address@hidden
Message-ID: <address@hidden>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Alexis Lussier Desbiens wrote:
Anyway, I added the PPM signal to the "default" mode and I only get
0,0,0,0,0... Can someone tell me which file I should look at to make
it work? Because right now... it doesn't seem to do much!
1) Check the PPM signal on the appropriate pin (PPM_In, c.f.
http://www.recherche.enac.fr/paparazzi/wiki/index.php/Tiny)
2) Check that your configuration includes the appropriate RC
configuration file. The file name must appear in the conf.xml file
(c.f.
http://www.recherche.enac.fr/paparazzi/wiki/index.php/Conf.xml).
The contents of this file is described in
http://www.recherche.enac.fr/paparazzi/wiki/index.php/Radio_Control :
- wrong attributes of the "radio" element will prevent the decoder
to
recognize any PPM frame;
- same for a wrong number or channels.
A oscilloscope may help !
--Pascal
------------------------------
Message: 5
Date: Thu, 11 Oct 2007 23:25:30 -0700
From: "David Conger" <address@hidden>
Subject: [Paparazzi-devel] Re: Paparazzi-devel Digest, Vol 43, Issue 5
To: address@hidden
Message-ID:
<address@hidden>
Content-Type: text/plain; charset="iso-8859-1"
Greetings again,
I realize even after building the tiny to "fly" the plane I will
need some
way for the autopilot to know the attitude and pitch/yaw/roll that
is going
on and correct...IR sensors to me seem super crude.
Has anyone seen these:
http://www.analog.com/UploadedFiles/Data_Sheets/ADIS16350_16355.pdf
Seems to have everything necessary in one place. Would this work
with a
Tiny? Anyone willing to hint me to the right resource to learn how I
would
do that? I'm assuming tiny would just need to "read" the outputs
from this
and simply apply the same PID logic correct?
I'm guessing in short time these parts will come down in price
considerably.
Also, I have been lucky. Someone I work with has offered to build me 2
Tiny's. I work for a large company that has labs with all the
equipment. So,
he's an awesome resource for me. Seems he found several issues with
either
the Mouser Parts and the Circuit Board I'll share when he debriefs
me on
completion of the first board. I also hear there is a company nearby
that
will build/fabricate circuit boards for me from designs. I will ask
him
about the tiny 2.1. So, a big leap forward on my end. Is the Eagletree
design ready for fabrication that's in CVS?
Best Regards,
David Conger
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Message: 6
Date: Fri, 12 Oct 2007 06:29:08 -0700
From: address@hidden
Subject: RE: [Paparazzi-devel] Re: Paparazzi-devel Digest, Vol 43,
Issue 5
To: address@hidden
Message-ID:
<address@hidden
>
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Message: 7
Date: Fri, 12 Oct 2007 15:34:32 +0200
From: "Ethan Arnold" <address@hidden>
Subject: AW: [Paparazzi-devel] Re: Paparazzi-devel Digest, Vol 43,
Issue 5
To: <address@hidden>
Message-ID: <address@hidden>
Content-Type: text/plain; charset="us-ascii"
Hehehe, good answer Anton :-)
Yes, sometimes the simplest solutions are the best...
Ethan
________________________________
Von: address@hidden
[mailto:address@hidden Im
Auftrag von
address@hidden
Gesendet: Freitag, 12. Oktober 2007 15:29
An: address@hidden
Betreff: RE: [Paparazzi-devel] Re: Paparazzi-devel Digest, Vol 43,
Issue 5
David,
In short, no this sensor is not all you need. The reason for this
is that
it is an inertial based sensor. It will output both rates and
accelerations, but give you no information on attitude. Without
attitude
the aircraft wont know which way is up as we like to say. People
who use
these sensors apply various filters, the most common of which is a
kalman
filter to take the data from these noisy and drifting sensors, and
try to
get an accurate attitude model. They are prone to getting confused
simply
because the new position is always based on the previous one, so
care must
be taken when writing the filter, and to put limits and bounds on
the inputs
from the sensors.
In the case of hte IR, although "Crude" as you say, they output an
angle.
This absolute attitude means the plane can not get confused of 1
blip of
data is bad, because it will just use the next. These sensors have
proved
they work over water, in deep cold, and even in snow I think(iceland
team
chime in here). So although crude, the proof is in the demonstration
success. Look at the record of MAV competitions the last 3 years
and you
will see its a IR based airplane on top almost every time. Not bad
for some
FMA hobby crap huh?
Anton
-------- Original Message --------
From: "David Conger" <address@hidden>
Date: Thu, October 11, 2007 11:25 pm
To: address@hidden
Greetings again,
I realize even after building the tiny to "fly" the plane I will
need some way for the autopilot to know the attitude and pitch/yaw/
roll that
is going on and correct...IR sensors to me seem super crude.
Has anyone seen these:
http://www.analog.com/UploadedFiles/Data_Sheets/ADIS16350_16355.pdf
Seems to have everything necessary in one place. Would this work
with a Tiny? Anyone willing to hint me to the right resource to
learn how I
would do that? I'm assuming tiny would just need to "read" the
outputs from
this and simply apply the same PID logic correct?
I'm guessing in short time these parts will come down in price
considerably.
Also, I have been lucky. Someone I work with has offered to build
me
2 Tiny's. I work for a large company that has labs with all the
equipment.
So, he's an awesome resource for me. Seems he found several issues
with
either the Mouser Parts and the Circuit Board I'll share when he
debriefs me
on completion of the first board. I also hear there is a company
nearby that
will build/fabricate circuit boards for me from designs. I will ask
him
about the tiny 2.1. So, a big leap forward on my end. Is the Eagletree
design ready for fabrication that's in CVS?
Best Regards,
David Conger
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End of Paparazzi-devel Digest, Vol 43, Issue 6
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