highaltitude.log.20080309

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[00:38] <Laurenceb_> I'm using some recovery software to try and find the lost files, but no luck so far :(
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[00:48] <akawaka> laurenceb_: what happened?
[00:49] <akawaka> what filesystem?
[00:49] <Laurenceb_> fat32 partition
[00:49] <Laurenceb_> on my hdd
[00:50] <Laurenceb_> theres a windows installation on there, and I was working on work in there from linux
[00:50] <Laurenceb_> and its all gone
[00:50] <Laurenceb_> (not the whole partition, just my work)
[00:58] <Laurenceb_> I think its completely lots
[00:59] <Laurenceb_> seems to have been deleted and overwritten :( And it needed to be ready by monday am... I'm not sure if I can redo everything by then
[00:59] <Laurenceb_> it was about 4 days work
[01:04] <akawaka> yuck
[01:05] <akawaka> what recovery software are you using?
[01:08] <Laurenceb_> sleuthkit
[01:09] <Laurenceb_> my life's a disaster :(
[01:11] <Laurenceb_> its like sods law + 1
[01:13] <Laurenceb_> it would prob be more efficient to give up and redo it, but I only have 36 hours... and I cant stay up that long without sleeping
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[01:55] <Laurenceb_> nope its lost :(
[01:55] <Laurenceb_> only the windows recycle bin to look in I guess....
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[03:50] <natrium42> Laurenceb_, watching ATV launch?
[03:50] <Laurenceb_> oh
[03:50] <Laurenceb_> something fun
[03:50] <natrium42> http://www.nasa.gov/55644main_NASATV_Windows.asx
[03:50] <Laurenceb_> where ?
[03:50] <natrium42> nasa tv
[03:50] <Laurenceb_> cool
[03:50] <natrium42> 13 mins left
[03:50] <Laurenceb_> sweet
[03:51] <Laurenceb_> hope it works
[03:51] <natrium42> yeah :)
[03:51] <Laurenceb_> maybe I will jinx it :s
[03:51] <natrium42> lol
[03:51] <Laurenceb_> seems to be happening a lot at the moment
[03:52] <Laurenceb_> their files will start disappearing off their hdd
[03:52] <Laurenceb_> i like the musac
[03:53] <natrium42> hehe
[03:53] <natrium42> are you that powerful? :P
[03:53] <Laurenceb_> everyone at the department is complaining about it, their satellite datalink will go down
[03:54] <Laurenceb_> so no weather data
[03:55] <Laurenceb_> they r'e constructing a 100TB raid array to store data at the moment, for weather satellite work
[03:55] <natrium42> quite some storage
[03:56] <Laurenceb_> but I'd better stay away from it
[03:56] <natrium42> perhaps you have a magnetic field around you :P
[03:56] <natrium42> "Unlike most Ariane launches that feature launch windows that can extend as much as a couple hours, this ATV mission has just one second for the rocket to blast off."
[03:56] <natrium42> small window...
[03:57] <Laurenceb_> wow
[04:00] <Laurenceb_> hmm i want to launch my own microsat
[04:00] <Laurenceb_> Its not impossible, a few grand
[04:00] <Laurenceb_> for a hundered gram sat on a russian launcher
[04:03] <Laurenceb_> here we go....
[04:21] <Laurenceb_> why is altitude increasing when the booster is off ?
[04:21] <Laurenceb_> oh... the earth is curved duh
[04:22] <natrium42> good stuff
[04:22] <Laurenceb_> it looks good
[04:22] <natrium42> yeah, elliptical orbit :P
[04:22] Action: Laurenceb_ ducks
[04:23] <Laurenceb_> its coming over europe
[04:25] <natrium42> neat
[04:25] <natrium42> once the shuttle launches, it will be possible to see 3 dots in the sky
[04:26] <natrium42> following the same path
[04:38] <Laurenceb_> I've changed /dev/hda2 from async to sync in fstab
[04:38] <Laurenceb_> might help
[05:13] <Laurenceb_> looks like it worked :P
[05:14] <natrium42> what did?
[05:17] <Laurenceb_> the lanuch
[05:17] <natrium42> yeah
[05:17] <Laurenceb_> not my document recovery
[05:17] <natrium42> now waiting for solar array deployment
[05:17] <Laurenceb_> I'm rewriting it all
[05:42] <natrium42> solar arrays deployed
[05:50] <Laurenceb_> I want to launch my own sat
[06:25] <Laurenceb_> ha I have pretty much got to the point I was at befor elosing work
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[10:37] <Hiena> Good morning!
[10:38] <Hiena> Anybody for some C bughunting?
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[11:04] <Hiena> Gran....
[11:04] <Hiena> +o
[11:05] <Hiena> I want to kill any random guy whom wrote the damned pointer specification.
[11:06] <Hiena> How the hell i could create the damned dynamic array of pointers?
[11:06] <Hiena> int *i; <=pointer, isn't?
[11:07] <Hiena> int **i; <=pointer of pointer, isn't?
[11:08] <Hiena> i = malloc (n * sizeof(int)); <=allocating n byte memory and the pointer will point to it, isn't?
[11:10] <Hiena> *i = malloc (n * sizeof(int *)); <=allocating n pointer space in the memory and will point to the first pointer, isn't?
[11:11] <Hiena> But no...This #&@ wont work on this way...
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[13:02] <laurence_> http://www.youtube.com/watch?v=1P3Wc-37pC4
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[14:03] Nick change: laurence_ -> Laurenceb_
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[15:47] <Laurenceb_> hey edmoore
[15:47] <Laurenceb_> I'm still at work
[15:49] <edmoore> oh?
[15:50] <Laurenceb_> havent been away from my desk :P
[15:51] <edmoore> lol
[15:51] <Laurenceb_> I'm on the verge of being finished
[15:51] <edmoore> since when?
[15:51] <Laurenceb_> about 24 hours ago
[15:52] <Laurenceb_> think I'm about to hit the page limit :S
[15:52] Action: Laurenceb_ gets more coffee
[15:55] <edmoore> lol
[15:55] <edmoore> sleep laurence
[15:55] <edmoore> when is launch>?
[15:55] <Laurenceb_> hmm
[15:55] <Laurenceb_> maybe a week
[15:55] <Laurenceb_> need to get this draft report done
[15:56] <edmoore> sure
[15:56] <Laurenceb_> its in for monday, then I have to fix the temp sensor, check the phone out again, and test out the new radio firmware
[15:57] <Laurenceb_> we also have to do a flow test where I dont screw up half way through, hopefully monday afternoon
[15:58] <Laurenceb_> apparently if we dont launch I can get paid to do a launch over summer
[16:00] <Laurenceb_> I've been working on a mark 2 design with sampler heads mounted on a rotating alu disk, fixed to a geared motor, and using an optocoupler to swap them around
[16:02] <Laurenceb_> have you seem the imu code on sparkfuns forum?
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[18:58] <edmoore> hi jcoxon
[19:00] <laurence_> hey ed
[19:00] Nick change: laurence_ -> Laurenceb_
[19:00] <Laurenceb_> edmoore: have you seem the rough IMU code on the sparkfun forum?
[19:01] <edmoore> new or old?
[19:01] <jcoxon> hey edmoore
[19:01] <Laurenceb_> new or old forum?
[19:01] <edmoore> new or old code?
[19:01] <edmoore> basically, whose code?
[19:01] <Laurenceb_> its quite old
[19:01] <edmoore> I've seen lots of code on the sparkfun forum
[19:01] <edmoore> ghint?
[19:02] <Laurenceb_> http://forum.sparkfun.com/viewtopic.php?t=6186
[19:03] <Laurenceb_> anyway, its very basic, just accels -> roll and pitch -> kalman with gyros
[19:03] <Laurenceb_> its only two axis
[19:03] <Laurenceb_> and will go mad if your spinning about the third, but I think thats solvable
[19:03] <Laurenceb_> with athird gyro
[19:03] <edmoore> yeah seen that
[19:03] <edmoore> as you mention, quite basic
[19:04] <Laurenceb_> its very interesting, I think it would work for a rocket with a bit more work, thermopiles for the accels, and a third gyro
[19:05] <Laurenceb_> then you incorporate a kalman filter based on the third gyro into the propogation matrix
[19:05] <Laurenceb_> and it "twists it"
[19:05] <Laurenceb_> to accomodate for a spin screwing up the thermopile outputs
[19:06] <Laurenceb_> hard to describe in works... i'll write it down if I have time
[19:06] <edmoore> there are various ways to model that
[19:06] <Laurenceb_> I just like it as its quick and dirty
[19:06] <Laurenceb_> not really the proper way, but fast
[19:07] <edmoore> well that's always the balance
[19:08] <edmoore> there are ways of doing it better and fast
[19:08] <Laurenceb_> if your rocket is off vertical and spinning about its axis, the thermos will give a signal, but the gyros wont
[19:08] <Laurenceb_> really you want to "despin" the thermos
[19:08] <Laurenceb_> and have a P term that "rotates"
[19:09] <Laurenceb_> thats what you do with the third gyro
[19:09] <Laurenceb_> gyros --> the D term
[19:10] <Laurenceb_> oddly if you had no kalman filter this wouldnt be needed
[19:10] <Laurenceb_> but the kalman will filter out the effect of the spin, leaving your rocket to corkscrew into oblivion
[19:11] <Laurenceb_> this 3D stuff messes my head up :s
[19:14] <edmoore> it's good for focussing the brain
[19:14] <Laurenceb_> to put in nicely you transform the old roll and pitch into a new frame with each propogation, using the third gyro
[19:14] <edmoore> deriving the kalman gain matrix from first principles just to convince myself was interesting, to say the least
[19:14] <Laurenceb_> then you kalman filter doesnt filter out the rotation
[19:15] <Laurenceb_> I have to know that :P
[19:15] <edmoore> right, out time
[19:15] <edmoore> cya later
[19:15] <Laurenceb_> cya
[19:15] <Laurenceb_> have fun
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[20:47] <Laurenceb_> is there an app under linuc to spell check textfiles?
[20:50] <natrium42> aspell
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[21:40] <Laurenceb_> thanx, spellchecked :P
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[23:27] <jcoxon> hmmmmmm
[23:28] <jcoxon> it seems that most of gm862 (non-gps) modules don't have the python processor
[23:29] <Laurenceb_> ngw100 :P
[23:30] <Laurenceb_> edmoore: could you solder an AVR32 with your hot sir kit?
[23:30] <jcoxon> Laurenceb_, not really the point as it doesn't have a GSM module!
[23:30] <Laurenceb_> sir=air*
[23:30] <Laurenceb_> its BGA
[23:30] <edmoore> lqfp?
[23:30] <edmoore> oh
[23:30] <edmoore> maybe
[23:31] <edmoore> oven would be much better
[23:31] <Laurenceb_> I'm thinking you could make a mini NGW100 using the schematics
[23:31] <edmoore> i'd def build an oven over attempting to hot-air
[23:31] <Laurenceb_> ok
[23:31] <jcoxon> the gm862-gps is only ?10 more expensive
[23:31] <Laurenceb_> I was someone mounted a 6" TFT on one and got it playing doom :D
[23:33] <Laurenceb_> I guess you could use the same technique to make a rather large linux phone/pda
[23:41] <jcoxon> night all
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[23:51] <Laurenceb_> edmoore: the cool thing is that I think you can use a linear approximation for the third gyro integration I was talking about earlier
[23:52] <Laurenceb_> so nice and fast... I'm playing with the 3d trig in gnuplot, and for < 45 degree coning angle, the errors are a few %
[23:53] Action: Laurenceb_ gets back to his work
[00:00] --- Mon Mar 10 2008