highaltitude.log.20080223

[00:00] <natrium42> very cool
[00:03] <Laurenceb> its all being installed on the instruments arm thats also being made in the lab :P
[00:28] jcoxon (n=jcoxon@host86-129-61-253.range86-129.btcentralplus.com) left irc: "Leaving"
[01:23] flowolf (n=flowolf@host254-234-dynamic.3-79-r.retail.telecomitalia.it) left irc: "Leaving"
[01:33] edmoore_ (n=edmoore@pomegranate.chu.cam.ac.uk) left irc:
[02:15] <Laurenceb> http://wiki.ukhas.org.uk/projects:daughterboard_code
[02:16] <Laurenceb> new code (its had a bit of tweaking so it actually works now)
[04:24] Laurenceb (n=laurence@dhcp37-235.sthughs.ox.ac.uk) left #highaltitude ("Leaving").
[06:28] Laurenceb (n=laurence@dhcp37-235.sthughs.ox.ac.uk) joined #highaltitude.
[06:38] Laurenceb (n=laurence@dhcp37-235.sthughs.ox.ac.uk) left irc: Remote closed the connection
[07:45] natrium42 (n=alexei@CPE000625d867e2-CM0014045885be.cpe.net.cable.rogers.com) left irc: "pwned!"
[08:33] Simon-MPFH (n=simon@phantom.mpfh.co.uk) joined #highaltitude.
[08:58] edmoore (n=edmoore@pomegranate.chu.cam.ac.uk) joined #highaltitude.
[09:13] jcoxon (n=jcoxon@host86-129-61-253.range86-129.btcentralplus.com) joined #highaltitude.
[09:13] <jcoxon> hey edmoore
[09:14] <edmoore> morning!
[09:14] <edmoore> how're you?
[09:14] <jcoxon> good thanks
[09:14] <jcoxon> hows the car?
[09:19] edmoore (n=edmoore@pomegranate.chu.cam.ac.uk) left irc:
[09:19] <jcoxon> oops ;-(
[09:42] edmoore (n=edmoore@pomegranate.chu.cam.ac.uk) joined #highaltitude.
[09:44] edmoore (n=edmoore@pomegranate.chu.cam.ac.uk) left irc: Client Quit
[10:19] flowolf (n=flowolf@host254-234-dynamic.3-79-r.retail.telecomitalia.it) joined #highaltitude.
[11:43] MetaMorfoziS (n=khmhm@dsl51B6AB22.pool.t-online.hu) joined #highaltitude.
[11:52] flowolf (n=flowolf@host254-234-dynamic.3-79-r.retail.telecomitalia.it) left irc: Read error: 60 (Operation timed out)
[12:01] flowolf (n=flowolf@host254-234-dynamic.3-79-r.retail.telecomitalia.it) joined #highaltitude.
[13:47] MetaMorfoziS (n=khmhm@dsl51B6AB22.pool.t-online.hu) left irc: "Most akkor mit csinalt aki miert lepett ki?"
[13:47] edmoore (n=edmoore@pomegranate.chu.cam.ac.uk) joined #highaltitude.
[13:51] edmoore_ (n=edmoore@pomegranate.chu.cam.ac.uk) joined #highaltitude.
[13:51] edmoore (n=edmoore@pomegranate.chu.cam.ac.uk) left irc: Read error: 104 (Connection reset by peer)
[14:24] edmoore_ (n=edmoore@pomegranate.chu.cam.ac.uk) left irc:
[14:45] Hiena (n=Hiena@81.93.195.181.datatrans.hu) joined #highaltitude.
[14:45] <Hiena> .
[14:45] <Hiena> Good evening!
[15:11] borism_ (n=boris@88-196-196-27-dsl.krw.estpak.ee) joined #highaltitude.
[15:15] borism (n=boris@195-50-200-97-dsl.krw.estpak.ee) left irc: Read error: 145 (Connection timed out)
[15:40] Hiena (n=Hiena@81.93.195.181.datatrans.hu) left irc: "-=Alkoholmentes-sör és repülõgép-szimulátor, biztos út a guminõ felé=-"
[16:13] MetaMorfoziS (n=khmhm@dsl51B6AB22.pool.t-online.hu) joined #highaltitude.
[16:14] yansa (n=yans@host-89-167-37-237.pronet.lublin.pl) joined #highaltitude.
[16:55] flowolf (n=flowolf@host254-234-dynamic.3-79-r.retail.telecomitalia.it) left irc: "Leaving"
[17:15] borism (n=boris@84-50-200-52-dsl.est.estpak.ee) joined #highaltitude.
[17:20] borism_ (n=boris@88-196-196-27-dsl.krw.estpak.ee) left irc: Read error: 145 (Connection timed out)
[18:24] yansa (n=yans@host-89-167-37-237.pronet.lublin.pl) left irc: Read error: 113 (No route to host)
[18:27] yansa (n=yans@host-89-167-37-237.pronet.lublin.pl) joined #highaltitude.
[18:58] MetaMorfoziS (n=khmhm@dsl51B6AB22.pool.t-online.hu) left irc: Read error: 104 (Connection reset by peer)
[19:19] flowolf (n=flowolf@host254-234-dynamic.3-79-r.retail.telecomitalia.it) joined #highaltitude.
[19:26] MetaMorfoziS (n=khmhm@dsl51B6AB22.pool.t-online.hu) joined #highaltitude.
[19:27] <MetaMorfoziS> Hi all
[19:27] <MetaMorfoziS> does anybody uses kicad from you?
[19:38] natrium42 (n=alexei@CPE000625d867e2-CM0014045885be.cpe.net.cable.rogers.com) joined #highaltitude.
[19:54] flowolf (n=flowolf@host254-234-dynamic.3-79-r.retail.telecomitalia.it) left irc: Read error: 113 (No route to host)
[19:56] flowolf (n=flowolf@host254-234-dynamic.3-79-r.retail.telecomitalia.it) joined #highaltitude.
[20:15] MetaMorfoziS (n=khmhm@dsl51B6AB22.pool.t-online.hu) left irc: Read error: 104 (Connection reset by peer)
[20:38] borism (n=boris@84-50-200-52-dsl.est.estpak.ee) left irc: Client Quit
[20:55] Simon-MPFH (n=simon@phantom.mpfh.co.uk) left irc: "Leaving"
[21:17] Laurenceb (n=laurence@dhcp37-235.sthughs.ox.ac.uk) joined #highaltitude.
[21:18] <Laurenceb> hey jcoxon
[21:18] borism (n=boris@84-50-200-52-dsl.est.estpak.ee) joined #highaltitude.
[21:19] edmoore (n=edmoore@pomegranate.chu.cam.ac.uk) joined #highaltitude.
[21:21] <Laurenceb> hey edmoore
[21:21] <edmoore> yo
[21:21] <Laurenceb> the aerosol project is coming on, hopefully we'll launch in two weeks :P
[21:21] <Laurenceb> I'm just working on the python code
[21:22] <Laurenceb> http://wiki.ukhas.org.uk/projects:aerosol_code
[21:24] <edmoore> nice
[21:24] <Laurenceb> we're going to make an environmental testing chamber next week :D using dry ice
[21:24] <edmoore> inspired by make?
[21:24] <Laurenceb> yes, I'll follow their design, but we needed to anyway
[21:25] <Laurenceb> we can get dry ice from chemistry, usually they just have LN2 in the AOPP dept
[21:25] <edmoore> why not use that?
[21:25] <edmoore> much quicker
[21:25] <Laurenceb> the temperature is more controllable
[21:26] <edmoore> a cup of ln2 at t'bottom
[21:26] <Laurenceb> it could easily get way too cold
[21:27] <Laurenceb> edmoore: have you seen the construction photos?
[21:27] <edmoore> nope
[21:27] <Laurenceb> http://wiki.ukhas.org.uk/projects:aerosol
[21:29] <Laurenceb> I've fixed in the battery holders on the middle shelf since that, we're just waiting for a phone now
[21:29] <edmoore> cool
[21:29] <Laurenceb> think my supervisor has got one off ebay, but he's at home working on his car, and refuses to show up
[21:29] <Laurenceb> :(
[22:00] <Laurenceb> hows the rocket going?
[22:02] <Laurenceb> edmoore: any rocket progress?
[22:02] <edmoore> yup
[22:02] <edmoore> lots
[22:03] <edmoore> launching the hpr certificate-gainer next weekend too hopefully
[22:03] <jcoxon> hey all
[22:03] <edmoore> yo
[22:05] <Laurenceb> hpr certificate?
[22:05] <Laurenceb> ah high power rocketry?
[22:05] <edmoore> yeah
[22:05] <Laurenceb> so thats a rocket?
[22:05] <Laurenceb> at ears?
[22:05] <edmoore> yep
[22:06] <Laurenceb> i see
[22:06] <Laurenceb> interesting, didnt realise it worked like that
[22:06] <edmoore> that you launch rockets at ears?
[22:07] <Laurenceb> no, that you launch something to get certification
[22:07] <Laurenceb> yes it shows you know what your doing :P
[22:07] <Laurenceb> guess*
[22:08] <edmoore> well we need these things so we can buy and play with motors and so on
[22:08] <Laurenceb> yes
[22:08] <Laurenceb> I might have a go at writing some IMU code when I've got more time
[22:08] <edmoore> uhuh
[22:08] <Laurenceb> have you tried anything?
[22:09] <Laurenceb> IMU code wise
[22:09] <edmoore> yes, I've had a go at some stuff
[22:11] <Laurenceb> I've been playing with octave and gnuplot, its a nice way of doing things
[22:12] <edmoore> it is indeed. one of my favourite OS tools
[22:12] <Laurenceb> annoyingly my FFT deconvolution code wouldnt work
[22:13] <edmoore> what FFT algorithm did you use?
[22:13] <Laurenceb> but I could have predicted that, as it would have broken the shannon limit if it had
[22:14] <Laurenceb> FFT deconvolution, you have to use FFT correlation instead
[22:14] <edmoore> So you designed mathematically impossible code...
[22:14] <edmoore> that's my favourite kind
[22:14] <Laurenceb> which requires the autocorrelation of your chip code to be a delta function
[22:15] <Laurenceb> hence limiting your number of orthonormal chip codes to the code length, and keeping you within the shannon limit
[22:16] <Laurenceb> but deconvolution is pretty cool :P
[22:17] <Laurenceb> intuitively it looks impossible
[22:18] <edmoore> well no it seems fair enough
[22:18] <edmoore> how are you estimating the signal you convolved with?
[22:19] <Laurenceb> its the chip code
[22:19] <Laurenceb> or was... in my dodgy code
[22:19] <Laurenceb> or rather the chip code at a waterfall display "image"
[22:20] <edmoore> h'ok, but say a*b=c, and you which to deconvolve a from c, how are you estimating b?
[22:20] <Laurenceb> then you do a 2D deconvolution on a waterfall display
[22:20] <edmoore> or have a missed what you're doing
[22:20] <Laurenceb> rx----> waterfall, deconvolve waterfall using knowledge of the tx chip code
[22:20] <edmoore> h'ok I'm with you
[22:21] <Laurenceb> but its only works in an ideal case, its very vulnerable to noise, keeping you within the shannon limit
[22:22] <Laurenceb> one thing you could do with it is make a longwave IR camera with a thermopile
[22:23] <Laurenceb> scan with two servos, and have a heatsunk shroud, so you are in effect zero padded
[22:23] <Laurenceb> then deconvolve --> high resolution image
[22:25] <Laurenceb> a bit slow, but good if your poor and cant afford a proper thermal imaging camera
[22:27] <Laurenceb> I'm still trying to work out this annoying pressure sensor issue...
[22:28] <Laurenceb> edmoore: can you offer any suggestions? the pump causes the pressure to oscillate all over the place
[22:28] <Laurenceb> I'm low pass filtering, but it doesnt help too much
[22:29] <edmoore> so you want a value for the pressure
[22:29] <Laurenceb> yes
[22:29] <edmoore> what kind of LPF are you doing?
[22:29] <Laurenceb> its a cap across the feedback loop of the op amp
[22:29] <Laurenceb> I'm thinking maybe a two pole filter
[22:30] <edmoore> have you been able to characterize the crap the pump is giving out?
[22:30] <Laurenceb> yes, its a sine wave
[22:30] <Laurenceb> practically 0 to P
[22:30] <Laurenceb> I want to know 1/2P
[22:30] <Laurenceb> ie the average
[22:31] <Laurenceb> around 40Hz or so
[22:31] <edmoore> oh right
[22:31] <edmoore> yeah, or just try and filter a bit more agressively
[22:31] <Laurenceb> the problem is I want to do it with one opamp, and I have to "rescale" the voltage levels
[22:32] <Laurenceb> ie take 0.5 to 6.5V and output 0 to 5v
[22:33] <edmoore> maybe do it in software?
[22:34] <Laurenceb> I dont think I can sample fast enough
[22:34] <Laurenceb> with the other interrupts on the avr...
[22:34] <Laurenceb> I'll probably try a Sallen key filter
[22:35] <Laurenceb> http://en.wikipedia.org/wiki/Sallen_Key_filter "not all Sallen and Key filters have a gain of 1 in the passband. Non-unity-gain buffers can also be used (e.g., by adding additional resistors"
[22:36] <Laurenceb> think some fiddling with resistors is required
[22:37] <Laurenceb> but not like this ... http://data1.blog.de/blog/m/mein-blog-dein/img/resistor-pr0n.jpg
[22:46] jcoxon (n=jcoxon@host86-129-61-253.range86-129.btcentralplus.com) left irc: "Leaving"
[22:47] Quai (i=kaysb@babylonia.underworld.no) left irc: "Changing server"
[23:25] edmoore (n=edmoore@pomegranate.chu.cam.ac.uk) left irc:
[00:00] --- Sun Feb 24 2008