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The "9 DOF" unit can easily be your low-power, small IMU.<br>
<br>
<br>
<div class="moz-cite-prefix">On 07/16/2014 08:49 PM, Stephan Henning
wrote:<br>
</div>
<blockquote
cite="mid:CACu1UD4AU94==OihtQ+Rd3HPce5U+QQita0G42aXdGN1roWaew@mail.gmail.com"
type="cite">
<div dir="ltr">David is correct, unless you are using a very very
high end GPS module (which most likely would have an internal
IMU at this point), do not rely on its data for altitude unless
you have to. There are sensors out there with better resolution,
, update rate. and are nice and cheap that would work just as
well. GPS can be very finicky, redundant data sources is a very
good thing to have.
<div>
<br>
</div>
<div>I haven't been paying very close attention to this
conversation thread, but if the sensor package can be built
cheap enough, it may not be a bad idea to have two. I would be
worth spending some time to make sure all the sensor data
timing is well understood and synchronized. You never know
what you might be able to learn from a successful (or failed)
flight if you have accurate time data attached to the sensor
measurements. </div>
<div><br>
</div>
<div>It might be worth investigating having a redundant memory
storage device, maybe back it up on a 'rugged' usb drive that
might have a chance of surviving a flight failure. </div>
<div><br>
</div>
<div>
-stephan</div>
</div>
<div class="gmail_extra"><br>
<br>
<div class="gmail_quote">On Wed, Jul 16, 2014 at 7:28 PM, david
<span dir="ltr"><<a moz-do-not-send="true"
href="mailto:ainut@knology.net" target="_blank">ainut@knology.net</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000"> There are 9+
(so-called) DOF sensors on the market now in a single
package (some under $40), obviating the need for a
separate accelerometer. It would definitely be
interesting to see the G-forces as applied all along the
track.<br>
Unless someone in the project is married to the RPi, the
BeagleBone Black (BBB) has a lot more compute power and
functionality.<br>
<br>
Don't count on the accuracy of GPS altitude unless you
have a confirmed WAAS (or equivalent) signal all during
the flight. GPS antenna is a major concern in this type
of environment. Some GPS modules can use signals besides
just the ones from the US, but the other countries'
WAAS-equivalents are even more flaky than ours! :) The
MTK3339 GPS (like used in Adafruit's Ultimate GPS
products) seems to be robust. I'm just beginning to
program it now. Very low power and can be had for under
$16 in small quantities, or with circuit board and glue
for about $40 from Adafruit.<br>
<br>
For recording video and metadata, again, the BBB is a good
choice as I have confirmed it works with a 32 Gb SD card.
By the weekend, I'll know it if works with the newer 64 Gb
SD cards.<br>
<br>
David M.
<div>
<div class="h5"><br>
<br>
<br>
<div>On 07/16/2014 05:49 PM, Ethan Chew wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">Cool!
<div><br>
</div>
<div> So we are talking about the following
things we want to do:</div>
<div>
<ul>
<li>In-Flight Automated Photography</li>
<ul>
<li>Overlay in-flight metadata from on-board
sensors; <span
style="font-family:arial,sans-serif;font-size:13px">GPS
coordinates, altitude, temperature, air
pressure, CO2, speed, and time from
launch (T+).</span></li>
<li><span
style="font-family:arial,sans-serif;font-size:13px">Can
be done either in-flight or as
post-processing (encode flight data as
exif, add overlay in post).</span></li>
</ul>
<li>Record flight data for post-flight
modelling and visualization opportunities.</li>
<ul>
<li>Record 6-dof, acceleration and skin
temperature data in-flight.</li>
<li>Calculate ballistic coefficient to add
to visualization opportunities.</li>
</ul>
</ul>
</div>
<div> And that would mean the following
sensors:</div>
<div>
<ul>
<li>Video/Photo Camera</li>
<li>GPS (speed & altitude can be derived
from GPS data.)</li>
<li>Altimeter</li>
<li>Thermometer (setup for ambient and skin
temperature readings)</li>
<li>Barometer</li>
<li>CO2 Gas Sensor</li>
<li>Clock (can be done by the Raspberry Pi.)</li>
<li>6-dof sensing</li>
<li>Accelerometers</li>
</ul>
</div>
<div>Made a wiki: <a moz-do-not-send="true"
href="https://256.makerslocal.org/wiki/Flight_Code_Project"
target="_blank">https://256.makerslocal.org/wiki/Flight_Code_Project</a></div>
<div><br>
</div>
<div> - Ethan</div>
<div><br>
</div>
<div>P.S. Of administrative note; I got a
clarification from Masten about educational
institutions flying for free. At this point in
time, the Prometheus Project is open only to
educational institutions as Masten is seeking to
encourage high school and college students to
get into engineering. Therefore, the project
would have to involve students in <span
style="color:rgb(0,0,0);font-family:sans-serif;font-size:13px;line-height:19.049999237060547px">designing,
building, and programming the flight
experiments. The project could either be run
as a class and teaches UAH and other
Huntsville high school students or the makers
involved would academically advise a student
team. </span></div>
<div><span
style="color:rgb(0,0,0);font-family:sans-serif;font-size:13px;line-height:19.049999237060547px"><br>
</span></div>
<div><span
style="color:rgb(0,0,0);font-family:sans-serif;font-size:13px;line-height:19.049999237060547px">Kix,
taking a page out of your book, how did you
run your program with FIRST Robotics when you
were in the Makers Local 256 shop?</span></div>
<div><br>
</div>
</div>
<div class="gmail_extra"><br>
<br>
<div class="gmail_quote">On Wed, Jul 16, 2014 at
8:05 AM, Phillip Showers <span dir="ltr"><<a
moz-do-not-send="true"
href="mailto:phillip.showers@gmail.com"
target="_blank">phillip.showers@gmail.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0
0 0 .8ex;border-left:1px #ccc
solid;padding-left:1ex">
<div dir="ltr">
<div>you definitely want 6-dof for post
flight modelling as well. tie in a common
variable like time and pump in stuff like
6-dof, acceleration and skin temp. You can
probably just calculate the ballistic
coefficient from cad but that gets you
started on some really fun visualization
opportunities.<br>
</div>
<br>
Phil<br>
</div>
<div>
<div>
<div class="gmail_extra"><br>
<br>
<div class="gmail_quote">On Wed, Jul 16,
2014 at 8:34 AM, Satyam Nayak <span
dir="ltr"><<a
moz-do-not-send="true"
href="mailto:nayaksatyam@gmail.com"
target="_blank">nayaksatyam@gmail.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote"
style="margin:0 0 0
.8ex;border-left:1px #ccc
solid;padding-left:1ex">
<div dir="ltr">I ++1 Josh's
suggestion about adding metadata
to the picture. </div>
<div>
<div>
<div class="gmail_extra"><br>
<br>
<div class="gmail_quote">On
Wed, Jul 16, 2014 at 8:57
AM, WebDawg <span dir="ltr"><<a
moz-do-not-send="true"
href="mailto:webdawg@gmail.com"
target="_blank">webdawg@gmail.com</a>></span>
wrote:<br>
<blockquote
class="gmail_quote"
style="margin:0 0 0
.8ex;border-left:1px #ccc
solid;padding-left:1ex">
<div dir="ltr">Even better
to have it upload that
data somewhere after the
launch for viewing
after.<br>
</div>
<div>
<div>
<div
class="gmail_extra"><br>
<br>
<div
class="gmail_quote">On
Wed, Jul 16, 2014
at 8:51 AM, Joshua
Pritt <span
dir="ltr"><<a
moz-do-not-send="true" href="mailto:ramgarden@gmail.com" target="_blank">ramgarden@gmail.com</a>></span>
wrote:<br>
<blockquote
class="gmail_quote"
style="margin:0
0 0
.8ex;border-left:1px
#ccc
solid;padding-left:1ex">
<div dir="ltr">It
would be neat
to overlay
some data on
each photo
like GPS
coords,
altitude,
temperature,
air pressure,
CO2, speed,
and time from
launch (T+).</div>
<div>
<div>
<div
class="gmail_extra"><br>
<br>
<div
class="gmail_quote">
On Wed, Jul
16, 2014 at
8:38 AM, Ethan
Chew <span
dir="ltr"><<a
moz-do-not-send="true" href="mailto:spacefelix@gmail.com"
target="_blank">spacefelix@gmail.com</a>></span>
wrote:<br>
<blockquote
class="gmail_quote"
style="margin:0
0 0
.8ex;border-left:1px
#ccc
solid;padding-left:1ex">
<p>Just
suggested to
Masten that
they add a
picture/video
camera (of the
size and
quality level
of the one in
your cell
phone) to the
sensor suite.
;)</p>
<div>
<div>
<div
class="gmail_quote">On
Jul 16, 2014
5:08 AM,
"Satyam Nayak"
<<a
moz-do-not-send="true"
href="mailto:nayaksatyam@gmail.com" target="_blank">nayaksatyam@gmail.com</a>>
wrote:<br
type="attribution">
<blockquote
class="gmail_quote"
style="margin:0
0 0
.8ex;border-left:1px
#ccc
solid;padding-left:1ex">
<div dir="ltr">I
was thinking
of doing
something
similar to
HSIS where we
put a camera
on auto
trigger and
took a bunch
of pictures of
the flight.</div>
<div
class="gmail_extra"><br>
<br>
<div
class="gmail_quote">On
Wed, Jul 16,
2014 at 6:40
AM, WebDawg <span
dir="ltr"><<a
moz-do-not-send="true" href="mailto:webdawg@gmail.com" target="_blank">webdawg@gmail.com</a>></span>
wrote:<br>
<blockquote
class="gmail_quote"
style="margin:0
0 0
.8ex;border-left:1px
#ccc
solid;padding-left:1ex">
<div dir="ltr">Anyone
plan to put
any effort
into this?<br>
</div>
<div>
<div>
<div
class="gmail_extra">
<br>
<br>
<div
class="gmail_quote">On
Wed, Jul 16,
2014 at 4:37
AM, Ethan Chew
<span
dir="ltr"><<a
moz-do-not-send="true" href="mailto:spacefelix@gmail.com"
target="_blank">spacefelix@gmail.com</a>></span>
wrote:<br>
<blockquote
class="gmail_quote"
style="margin:0
0 0
.8ex;border-left:1px
#ccc
solid;padding-left:1ex">
<div dir="ltr">P.S.
Note on the
sensor suite;
the hardware
in the suite
will be
determined by
Masten.
However, at
this point in
time of
Project
Prometheus,
Masten is open
to input on
what sensor
hardware to
install.
Please send
sensor
hardware
suggestions
to <font
style="font-family:arial,sans-serif;font-size:13px"
face="arial,
sans-serif"><a
moz-do-not-send="true" href="mailto:prometheus@masten.aero"
target="_blank">prometheus@masten.aero</a>.</font></div>
<div
class="gmail_extra">
<div>
<div><br>
<br>
<div
class="gmail_quote">On
Tue, Jul 15,
2014 at 6:42
AM, Ethan Chew
<span
dir="ltr"><<a
moz-do-not-send="true" href="mailto:spacefelix@gmail.com"
target="_blank">spacefelix@gmail.com</a>></span>
wrote:<br>
<blockquote
class="gmail_quote"
style="margin:0
0 0
.8ex;border-left:1px
#ccc
solid;padding-left:1ex">
<p>Hello!</p>
<div>
<p>On Jul 15,
2014 6:34 AM,
"Jeff Cotten"
<<a
moz-do-not-send="true"
href="mailto:omegix@gmail.com" target="_blank">omegix@gmail.com</a>>
wrote:<br>
><br>
><br>
> Hey
Ethan, will
the raspberry
pi be
connected to
the internet
during the
test?</p>
</div>
<p>Sorry, no.
To avoid
interfering
with Xombie's
control
system, the
crew has told
me no
transmitters
are allowed.</p>
<div>
<p>><br>
> If I
wrote a piece
of code that
logged into
#makerslocal
and reported
back the
altitude,
would it it be
able to reach
the freenode
server?</p>
</div>
<p>You'd need
to make an
isolated
flight data
recorder. Due
to the
restriction on
transmitters,
you can only
download your
data off a
shore
connection
when the
vehicle is
back on the
ground.</p>
<span><font
color="#888888">
<p> -
Ethan</p>
</font></span>
<div>
<div>
<p>><br>
><br>
> On Tue,
Jul 15, 2014
at 12:08 AM,
Ethan Chew
<<a
moz-do-not-send="true"
href="mailto:spacefelix@gmail.com" target="_blank">spacefelix@gmail.com</a>>
wrote:<br>
>><br>
>>
Hello,<br>
>><br>
>>
Take note, it
is my current
understanding
that
educational
institutions
get to fly for
free.<br>
>><br>
>>
From Masten
Space Systems
in Mojave, CA
(<a
moz-do-not-send="true"
href="http://masten.aero/" target="_blank">http://masten.aero/</a>), an
opportunity to
fly code on a
vertical
takeoff and
landing rocket
(such as
Xombie: <a
moz-do-not-send="true"
href="http://youtu.be/A5b9LnzjGgU" target="_blank">http://youtu.be/A5b9LnzjGgU</a>)
on Project
Prometheus:<br>
>> <br>
>> <a
moz-do-not-send="true"
href="http://masten.aero/2014/05/project-prometheus/" target="_blank">http://masten.aero/2014/05/project-prometheus/</a><br>
>><br>
>>
In summary;
there is a
Raspberry Pi
on board that
is connected
to a sensor
suite. Send
Masten some
code you want
to run during
a flight that
processes
inputs from
the sensors
during the
flight. The
project is for
the rapid,
streamlined
development of
tools relating
to; visual
navigation,
landing
detection,
mass
estimation
and position/attitude
estimation.
You can reach
them at <a
moz-do-not-send="true"
href="mailto:prometheus@masten.aero" target="_blank">prometheus@masten.aero</a> with
input and
questions
about the
program. <br>
>><br>
>>
Quote:<br>
>><br>
>>>>
the Masten
Team has also
been thinking
about ways we
could engage
the broader
community and
increase
accessibility
to our VTVL
vehicles. One
of the largest
barriers to
entry for any
technology
developer
seeking to
conduct
aerospace
flight testing
is access to a
vehicle.
Limited access
to an
integrated
GPS/IMU
navigation
system,
flight-rated
computing
platforms, and
sensors
present
additional
challenges to
innovators. In
the spirit of
broadening
access to
aerospace
resources, we
have had a
project
cooking in the
background
called
Prometheus.<br>
>>>><br>
>>>><br>
>>>>
Project
Prometheus is
a Masten
program
designed to
foster the
development of
flight-test
ready
technologies
by innovators
in academic
and research
settings. By
implementing a
standardized
interface
between Masten
vehicles and
experimental
software and
hardware
tools,
Prometheus
will provide a
streamlined,
efficient path
for technology
maturation
throughout the
course of tool
conception,
development
and flight
test. Access
to uniform,
flight-tested
hardware and
software
development
framework for
innovators
will
ultimately
reduce
integration,
development
and other
flight test
costs.<br>
>><br>
>><br>
>><br>
>>
-
Ethan/spacefelix<br>
>><br>
>>
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clear="all">
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</div>
</div>
</div>
<div>-- <br>
<div dir="ltr">
<p>
V/r Ethan</p>
<p>Working
E-mail: <a
moz-do-not-send="true"
href="mailto:spacefelix@gmail.com" style="color:rgb(17,85,204)"
target="_blank">spacefelix@gmail.com</a><br>
Business
E-mail: <a
moz-do-not-send="true"
href="mailto:shinen.chew@gmail.com" style="color:rgb(17,85,204)"
target="_blank">shinen.chew@gmail.com</a><br>
LinkedIn: <a
moz-do-not-send="true"
href="http://www.linkedin.com/in/ethanchew" style="color:rgb(17,85,204)"
target="_blank">www.linkedin.com/in/ethanchew</a><br>
US Cell: <a
moz-do-not-send="true"
value="+12177222103" style="color:rgb(17,85,204)">+12177222103</a><br>
Skype:
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-- <br>
<div dir="ltr">
<p> V/r Ethan</p>
<p>Working E-mail: <a moz-do-not-send="true"
href="mailto:spacefelix@gmail.com"
style="color:rgb(17,85,204)" target="_blank">spacefelix@gmail.com</a><br>
Business E-mail: <a moz-do-not-send="true"
href="mailto:shinen.chew@gmail.com"
style="color:rgb(17,85,204)" target="_blank">shinen.chew@gmail.com</a><br>
LinkedIn: <a moz-do-not-send="true"
href="http://www.linkedin.com/in/ethanchew"
style="color:rgb(17,85,204)" target="_blank">www.linkedin.com/in/ethanchew</a><br>
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value="+12177222103"
style="color:rgb(17,85,204)">+12177222103</a><br>
Skype: flyingfelix2</p>
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<pre wrap="">_______________________________________________
General mailing list
<a class="moz-txt-link-abbreviated" href="mailto:General@lists.makerslocal.org">General@lists.makerslocal.org</a>
<a class="moz-txt-link-freetext" href="http://lists.makerslocal.org/mailman/listinfo/general">http://lists.makerslocal.org/mailman/listinfo/general</a></pre>
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