I think this is a fair assessment:
http://en.wikipedia.org/wiki/Gain_scheduling:
"It is one of the simplest and intuitive forms of adaptive
control."
Note, this doesn't imply gain scheduling isn't completely fine when
properly applied.
[EMAIL PROTECTED] wrote:
> ... http://en.wikipedia.
Hey,
I think you're looking for the SCP1000.
--
I'm not sure where any of our pressure transducers are. According to my
inventory we should have these items:
IDG300 IDG-300 dual axis rate gyro on breakout board
IC-IDG300IDG-300 dual axis rate gy
Shoot. Maybe i do have it. I'll look around.
[EMAIL PROTECTED] wrote:
> > I can't find any of the above items at my house. Possibly these parts
> > were listed for an order that was never sent. I am pretty sure we did
> > have an SCP1000 though. Andrew?
>
> Really? I thought you bought one o
[EMAIL PROTECTED] wrote:
> when you purchased the Motorola MPX7100A, which vendor did you use?
> Anybody remember?
I think the 7100 is obsolete? Try the MPXM2102A. There is also a
ported version (AS). Both are available from DigiKey, about 10$.
> Do we still need these items?
> http://ps
Hey all, (forgive the re-ordered snip-snip editing)
Top down design:
[EMAIL PROTECTED]:
> Today we can start asking questions like:
> If we can only have low pass filtered data for x/y acceleration using a
> 32 sample filter (i.e. a control loop cycle time of at least 0.0128 sec)
> and we ass
[EMAIL PROTECTED]:
> > [..]
> > The road map we've been implicitly following is this:
> >
> > . LV2 demonstrates telemetry and orienteering
> >
> > . LV2+ demonstrates trajectory following
> >
> > . LV3 design phase low cost amateur launch vehicle
> >
> > . Motor shopping
>
Hey all,
What i told Dave on Wed. was wrong. (Thinking of the AVR.)
Might be better off anyway with the 32-bit timer capture function. I
think these will do what you want, and you get 8 of them. (Two timers
four each.)
[EMAIL PROTECTED]:
> Note: see page 20 of the manual (
> http://www.keil.c
Hey all,
Last meeting Jason, who has been by before, stopped by to see if we
wanted to do some work on the magnetometer.
I think this would be a good idea, and we should work on some of the
other avionics as well.
I think Maria has also expressed interest in doing some work on the
magnetometer,
It turned out the 1st available time slot to sew is Wednesday. I'd
rather sew than anything else because it feels like the right thing to
do to maintain momentum.
If you want 1 standard deviation, parachutes are 2 weeks out. Then
testing on top of that.
(2008.09.30) [EMAIL PROTECTED]:
> Isn't thi
(2008.10.01) [EMAIL PROTECTED]:
> Are we still considering the Honeywell HMC1043 as our core component?
> Jason and I were looking over the datasheet, but I couldn't be sure
> that it was the right one.
I think so.
I'm not aware of anything better. If we could find something that would
be fin
(2008.10.02) [EMAIL PROTECTED]:
> Which A/D were you thinking about using?
I like the ADS1158 from Texas Instruments. This is the same unit
proposed for the Openahrms robot navigation project coming out of the
Portland area Robotics Society.
Features:
Not too expensive for us (~20$ in small qua
Per discussion at the last meeting, here is a simple model for the slew
rate: /
/ \ /\
/ (theta)||
/ \ ||
(antenna) <--- (distance) ---> /\ (rocket)
(My mail is failing, so this will arrive very late, but i'm sending it anyway
because, well, i've already written it ;-) It's nice to see other people have
already covered the important points.
Congratulations! (It looks like you used every single pin on the
microcontroller ;)
(2008.12.2
Hmm,
CandU (CAN and USB)?
(2009.01.18) kirk...@pdx.edu:
> AWWWIOR Bus...
>
> My concern is with the use of a serial bus topology that normally has
> RTS, CTS, DSR, and CD pins; but we aren't going to use them? Will that
> require special driver hacking to make the endpoints *not* require the
Hey all,
We've been working on a design for the new pyrotechnic node in
connection with the 2009 PSAS capstone group.
Here is a possible accelerometer with sufficient signal range:
http://www.analog.com/static/imported-files/data_sheets/ADXL001.pdf
It is on the expensive side (~35$ in 1k quan
Sorry, don't quite understand 'unplugged "leakage"'.
Battery self discharge may be specified. For modern LiPo it should be
at least months to 50%.
(2009.02.01) da...@cecs.pdx.edu:
> hey, got a question related to batteries. is the unplugged "leakage"
> something that should be listed on a data
This is my understanding CAN vs USB,
USB wins for bulk and high speed data transfer.
USB wins for compatibility w/ standard hard/soft ware
USB as a control bus
Minuses
Complex driver developed for a different application suite
Driver is often tweaked
Millisecond latencies
Hard l
Sorry for the delay on this, it's been busy here.
(2009.02.04) scott.schue...@gmail.com:
> Hi all,
> I'm researching candidates to replace the current power switch controllers
> on the APS and I've got a couple questions.
>
> First: Is there such a thing as too small? I'm looking at a 3mm x 3mm
(2009.02.19) scott.schue...@gmail.com:
> Hey all,
> I have a couple of questions for power switches which I believe Tim and I
> kind of touched on last meeting, but I'm still a little unclear about.
>
> The controller chips allow you to set a limit to the power dissipated in the
> N-channel FET, a
Hey all,
We have a set of requirements for the current capstone
http://psas.pdx.edu/capstone2009/requirements/
Ignoring the ambiguity and imperfection of these, i'd like to say
something about what they mean and what they're for.
What follows is abstract, somewhat hard to read, and slightly f
The old CAD drawings in SVN were too inconvenient to get at, so i have
copied them to git and linked them off this page
http://psas.pdx.edu/oldcad/
If you're looking for old Eagle files, etc.
This page would be a good bet.
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I confirm. Can someone w/admin please look into this? Thanks.
(2009.02.26) da...@cecs.pdx.edu:
> hey
> having trouble loading the psas webpages, will this be an issue all day.
> I have had no issues viewing the pages in the past.
___
psas-avionics mai
(2009.03.12) scott.schue...@gmail.com:
> Hey guys,
> i have some questions about teh considerations when making a package in
> eagle. I'm working on the TPS2490.
>
> First:
> the datasheet shows the dimension tolerances for this part in a max/min
> format, for instance: width of the chip without
Welcome to the wonderful world of PCB design ;)
Ordinarily you'd have to read the datasheet, discover that the package
is a narrow ssop24 and then find that in a manufacturer drawing, or
possibly an IPC document, verify that the package you found was actually
the right package, and go from there.
Very good questions.
The PSAS library has evolved over time, but it has not been consistently
maintained. One result of this is that most of the packages don't
follow current best practices.
Of course we want new packages to be more up-to-date.
I looked around a bit for a decent example, i found
I think it's a good chip. I'm ok with switching.
If we do, please do the layout for the adjustable voltage version. I
think the fixed voltage versions can be accommodated in the same layout
by only placing a single zero-ohm in the feedback divider.
(2009.04.03) kenz...@yahoo.com:
> I was preparin
Since i didn't notice your message until now we'll have to go over this
at the Friday meeting, but in case you want to try it, assuming you have
access to the avionics-cad git repository somewhere:
In Eagle library editor:
"script libraries/psas_eagle_library.scr"
Should start the process. (Yo
Make them all the same size.
Wave soldering pads are sometimes done with larger corners. In my
opinion reflow pads should be equal throughout.
(2009.04.11) kenz...@yahoo.com:
>
> I'm doing the IC layout for the LPC2368 and I have a small discrepancy
> in land layouts that I would like clarificat
It's worth reading the background material on the psas website.
Specifically
http://psas.pdx.edu/AvionicsPowerSystemLv2/APS_BAT-Components.pdf
See RT100.
Also possibly
http://psas.pdx.edu/RocketScience/Thermistors.pdf
---
The basic idea is that charging should not occur when the battery
I didn't go back and look, but iirc, psas flight data has the same
pressure glitch at motor burn-out. Previously we have attributed the
glitch to changes in the pressure field over the vehicle surface due to
the presence or absence of motor plume.
This explanation may be wrong. In particular at su
Hey,
I tried to think about this a little bit.
One easy point, for us it's ok to charge the battery to 4.2 V. We
shouldn't be storing our batteries for long at elevated temperature.
AFAIK a day on the pad in the hot sun at 4.1 V vs 4.2 V is negligible in
terms of capacity change. Although it's tr
(2009.05.16) kenz...@yahoo.com:
>
> I'm sure this was mentioned at some point, but I can't find it at the moment.
>
> How do I shutoff airwires that connect to ground?? I don't want to see them
> right now, they make everything messy (hard to follow).
>
> Looks Like I need to designate a $GND l
(2009.05.19) scott.schue...@gmail.com:
> I'm working on the the APS board and I was just wondering what the min.
> trace width should be. One of the ICs I'm using is a 3mm x 3mm MSOP-10
> (TPS2490 hotswap controller) and the lands are narrow and close together
> meaning if I use the default 0.016'
(2009.05.23) kenz...@yahoo.com:
> [..] How do I un-hide hidden airwires?? Rats tells me that they are
> hidden, but I don't see how to see them.
Ordinarily there is at least one routed trace for a given hidden
signal. In that case just use the info command on that trace and
un-check "Airwires hidd
(2009.05.23) kenz...@yahoo.com:
> Ok, so I have made some progress today on the layout for the front end.
> I still haven't added any polygons for ground or power planes yet,
> everything is still coming together somewhat.? At least I finally have
> all the components on the board.If any of you ha
(2009.05.25) kenz...@yahoo.com:
> [..]
> I've fixed the issue with the ground return paths on the TPS63000 (I think).?
Yep, that's what i had in mind.
> As for the 0kaz?library, I have added it to git so you can review any
> of the packages I have made so far if you like.
Great, thanks.
> The S
(2009.07.30) kirk...@pdx.edu:
> While investigating some analog to digital converters for an IMU
> project I'm working on, I settled on a TI ADS1278. One reason for
> using this ADC is that it has such fine resolution that I may be
> able to eliminate the amplifiers on the input for most inertial
>
I don't know much about this sort of thing.
I'm guessing that a different implementation could have better numeric
stability properties.
Your key-phrase seems to be, "Series of first order difference
equations." Is that different than MAC-ing a polynomial equation?
I've done similar type things
Hey all,
Looks good :)
I don't see any errors.
--
There are several reset sources. I think they're ok, but not sure.
--
The USB connector is marked 'miniUSB'. Not sure which connector you're
using. I recommend micro-B (i.e. H11610CT-ND), following the cell-phone
charging standard
http://e
(2010.08.30) jboo...@gmail.com:
> Ok, I've looked over what I understand to be the latest GFE layout a few
> times. This would be node5-frontend.*
>
> Question Barrage Commencing:
Great, let's see if i still remember anything ;)
> Is there an assumed ground plane a-la "polygon", and if so, wou
The startups are in the ~/.eaglerc, there may be a setting for vias,
you'll have to check the pdf manual. However, once a via shape is
selected in a session, that shape should persist throughout the session
until you change it.
Try using the 'via' command in the command box and selecting the via
s
Hey,
Cool on getting it going :)
If the LPC exposed it's 1.8 V supply then you could just use a 'LV163 at
1.8 V. (Had to say it.)
For the cost of ~milliamp currents you could make your own 1.8 V supply
with a resistive divider. An 'LV163 should draw sub-milliamp at 1.5 MHz.
Maybe you could capa
Hey,
To get the ball rolling, here is a potential Atom board.
http://www.eurotech-inc.com/single-board-computer-atom-pc104-isis.asp
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http://lists.psas.pdx.edu/mailman/listinfo/psas-avion
Hey,
At some point i'd appreciate administrative assistance in getting the
amsmath environment working on the psas wiki. In particular i'd expect
something like this to work:
[[!teximg code="\begin{equation}\
F = m a\
\end{equation}"]]
It's my understanding that ikiwiki, at least in some versi
Hey,
Yep, that's a version 6.2 file.
I guess we're officially now moving to Eagle v6.2.
The version in debian/ubuntu is still 5.12 :(
Direct link:
http://www.cadsoftusa.com/download-eagle/
(2012.07.27) kwilson...@gmail.com:
>
> I tried to open imu-adapter.sch to reference some external pu
Hey,
Very interesting.
Others may know more about the low level, but i think the main thing you
need is "monitor" mode. I think this allows capture of frames even if
they have errors, then in principle all you have to do is compare the
received frames to the known pattern of transmission.
I thin
The "import-bmp.ulp" script is sometimes helpful for this.
Google for usage.
http://www.cadsoftusa.com/downloads/file/import-bmp.zip
(2016.04.24) a...@ece.pdx.edu:
> It'd be nice to have a PSAS logo as an EAGLE library part. Anyone want
> to do this? It's probably a pain. Logos are here:
>
> h
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