To the GPS folks, there is an interesting event that will occur this week
starting in 15 minutes or so, and going on sporadically this week/weekend.
There is a planned GPS outage over a broad area detailed here:
https://www.faasafety.gov/files/notices/2015/Jun/NSAWC_15-01_GPS_Flight_Advisory.pdf
ick your sample frequency to be at least 2 x (IF freq + 1 sided bandwidth).
>
> Anyone have anything to say about this? I'd appreciate thoughts on this!
>
Another possibility... Just use the 2 "I" bits at twice the sample
frequency and do the I-Q split in software with t
odule?
>
> On 07/04/2013 10:23 PM, Nathan Bergey wrote:
> > There is no data from the launch (T-0 to apogee). The last logfile
> > starts *after* we're already on parachutes.
> >
> >
> > I suspect we rebooted on motor ignition.
>
>
> __
gt;
> The raw logs are all here:
>
> https://github.com/psas/flight_data-launch10/tree/master/fc/fc
>
>
> I finished writing a parser for the FCF logs tonight and found what I
> suspected based on the few packets that made it to the ground:
>
> There is no data from the launc
cate,Datasheet,Driver,Firmware,Manual,Online%20Training,Specification,Utility,FAQ,Installation,Software%20API,Software%20API%20Manual>"
then click Driver(3).
They have Linux (your OS) and QNX (my OS). I don't remember if I tested
them or not, but I'm sure they work. This card seems we
>"The open drain SPI option is not implemented in this design. When a
> device
>is set up to be a slave, its I/Os are only active when it is
> selected by the
>SSEL signal being active."
>
>Since we will run the ADIS with the LPC in master mode, I d
On Tue, Oct 25, 2011 at 1:06 PM, Naga Pinjala wrote:
> No, I meant for turning off that output latch.
>
Sorry, I'm lost.
What are you trying to do?
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On Tue, Oct 25, 2011 at 9:37 AM, Nagasrinivas Pinjala wrote:
> Dan's answer is bit cryptic and needs more explanation. I referred the
> manual but it only speaks about how setting the bits in GPIO registers sets
> or clears the corresponding pins.
>
> >>" The P
I don't think that's correct. Bit 25 *will* be cleared, but the |= won't
help. The 'SET' registers will only set the GPIO bits. I think they are
always read back as '0', or at least they revert to '0' as soon as they have
modified the output latch. Rea
A couple of questions from someone familiar with real-time,
distributed communication; but not with usb isoc...
When you say 'read', are you describing the process that 1) requests
information from a remote source, 2) waits for the reply, and then 3)
returns that information to an applicati
* bandwidth) as we
proved when considering actuator force would destroy the fins, yet I
think I can easily make the case that it must be faster than 10Hz
(which is a 0.25-0.50Hz *control* bandwidth) due to the fast roll axis
dynamics.
So, between 10 and 1000 loops per second. If I had to
at measure processor load (instant, min, max, running average) based
on idle time. As you build the control system, you watch the metrics.
I don't let systems into 1st production with more than 70% loading.
The last one I did shipped at less than 20% loading (fairly simple
system).
If the
unting and peripherals more manageable.
In general, it probably doesn't matter what we launch, as long as we
launch *something*. I think we could make any of these work, just some
may take years longer than others.
Wow, that *IS* a nice module. And yeah, we're kinda stuck with launchi
Thanks for the replies. I thought I would touch on all of them in one
email to keep the reading shorter.
It was suggested off the list that I consider a decimation filter to
downsample the sample rate. This sounds reasonable, but I implemented
the iir filter at a 100 Hz sample rate and
y calculation (float-doubles),
the DC offset is too big to make the filter useful when converted to
fixed point math.
4) The fixed point data sizes get kind-of big for such a simple filter
(long long) if I want to keep my resolution.
5) Filter coefficients for a 1000Hz sample rate and a 1Hz
Andrew and Tim,
I'm working up a schematic for an IMU and I have a couple of questions
you might be able to answer...
First, Analog devices finally came out with a 3 axis accelerometer
with decent range (8/2009). The ADXL326 has 3 axis +-16 g's. Noise
spec is comparable but a
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 sensors!
This AD
Just as an FYI, I checked the rules for the BALLS launch regarding the
use of a kerosene - nitrous oxide rocket motor after our discussion on
Tuesday:
"...Liquid Engines MUST request written approval from the Tripoli
Board of Directors."
They don't say they are illegal,
That was the motor chuffing, we think.
Yeah, I don't think it's possible to hear a sonic boom if you can
already hear the engine (though the chuff sound was impressive). My
understanding is that a sonic 'boom' comes from the fact that you hear
no sound, then all
/category/calculators/pcb/
look down the list. There are other handy calcs for power dissipation as well.
For the second one, Check with your PCB Fab house and see what they
are capable of doing. I generally add a little insurance by *not*
going all the way down to the minimum trace/space
Quoting Ken Zig :
I am currently working on the EAGLE node 5 front end schematic and
have a few questions. So far I have removed the portions of the SPS
that I do not want to use. I have inserted some of the new SPS
design, and I have inserted the new LPC2368 controller. I have not
Here's a handy document I found when digging around the NXP website:
http://www.nxp.com/acrobat_download/packages/footprint/FOOTPRINT-HTQFP-HLQFP-LQFP-REFLOW.pdf
It gives the layout as recommended by NXP. Note that the thermal pads
in the center of the layout are for the HTQ packages onl
I have an exam Wednesday, so I won't be available until Thursday. As
for times, the later the better, but 5:00 will likely work for me.
Let's just use my code and my board. It just "works", and that's what
we need. We need a way to get power into the chamber, and
solate the host controller
from the rest of the system.) Because CAN is a hard-wired
bus, there's no physical-layer isolation between nodes, so a
bus short means we're totally screwed, and a bus open means
we're pretty well screwed, and a transceiver electrical
failure could in principle
ssible, either are trivial.
It seemed to me like this particular feature was a pain when
we tried this before? I thought we ended up kludging a node
addressing scheme that borrowed bits that may or may not
have belonged to us in order to get enough node addresses,
and then had trouble getting thi
Here we go again...
if(OS != Linux)
CAN = Easy;
In one respect, I agree with Sarah's statement in that the only active
node in an FC failure is the recovery node. Nothing else really matters.
That said, if you *must* have some sort of non-usb back channel
communication, CAN is the w
hen a signal is
coming in? Collisions? Error checking?
Seriously, I can't imagine it would take Dave and I more than a day to
get CAN working on the TQM5200 once the toolchain is set up. Since
no-one has actually completed any of the other node designs, using the
LPC2368/78 has no aff
Quoting Bdale Garbee :
ARGH! Yes. Thank you for spotting that.
No problem...
About 2.2 nC at our operating point.
...
I don't think it's necessary. But after talking to Keith, we'll add
the footprints. We've got the space and I've got to rework that part
of
Quoting Andrew Greenberg :
Hey Keith!
Bdale and I spent the day reviewing chip foot prints and have quite a
few minor updates. Bdale stuck them all on his server:
http://www.gag.com/~bdale/tmp/telemetrum/
This directory has postscript versions of the schematic and the pc board
along with
I've tested both of the ATV transmitters and cameras, and both work
well. I have a couple of minutes of really cool video taken from an RC
helicopter using the system, but it's saved to a mini DV tape. Anyone
have a good way to get it off of the mini DV tape into an MPEG format?
I'll add my $0.02 here... I used Flash Magic (to get started) on the
LPC -2378 board. It uses the serial connection to the ISP at up to
115200 bps (reasonably fast). It's free at
http://www.flashmagictool.com (if you are running under windows).
Anyway, it's a simple way
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