highaltitude.log.20091204

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[05:48] <juxta> hmm, it is generally accepted that a bearing would be in relation to true north, or magnetic north?
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[07:09] <juxta> hi rjharrison_
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[15:11] <edmoore> hi jcoxon
[15:11] <jcoxon> hey edmoore
[15:12] <edmoore> how's it going?
[15:12] <jcoxon> good thanks
[15:12] <jcoxon> still working on the payload
[15:13] <edmoore> exciting stuff
[15:13] <jcoxon> you?
[15:13] <edmoore> did I mention that we saw nova16 come down yesterday?
[15:13] <edmoore> we were really pretty close
[15:14] <jcoxon> yeah i saw the picture
[15:14] <jcoxon> shame you didn't reach your cutdown alt
[15:15] <edmoore> yes, that was a bit odd
[15:15] <edmoore> we're thinking it was rain
[15:15] <edmoore> it was raining pretty hard at launch
[15:15] <edmoore> ]
[15:15] <edmoore> water was streaming down the balloon and down its neck, onto my hands
[15:15] <edmoore> so there would have been a lot of ice building up in places i expect
[15:15] <jcoxon> yeah perhaps some icing of the water it carried up
[15:15] Action: SpeedEvil is surprised at t-mobile.
[15:16] <SpeedEvil> 20 quid gets you 6 months internet at 1G/mo
[15:16] <edmoore> it was duwe to pop at 30 according to sims, and we got the actaul ascent rate pretty much right
[15:16] <SpeedEvil> and I get 120K/s to kernel.org as a test
[15:16] <SpeedEvil> I wonder how much icing actually happens.
[15:16] <SpeedEvil> the balloon stretches a lot
[15:17] Action: SpeedEvil will be doing some OSM stuff with it.
[15:17] <jcoxon> SpeedEvil, we should fly some downward facing pics to add to OSM
[15:17] <jcoxon> pics -> cameras*
[15:18] <SpeedEvil> yeah
[15:19] <SpeedEvil> With consumer cameras, the sideways facing ones seem almost useless for that.
[15:20] <SpeedEvil> Though yahoo is usable in many areas
[15:20] <SpeedEvil> in that it has ~10-20cm resolution - and you can explicitly trace
[15:22] <jcoxon> http://ve9qrp.blogspot.com/2009/12/make-blog-posting.html#more
[15:22] <jcoxon> :-p
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[15:32] <edmoore> have a kmz from yesterday if anyone's interested
[15:32] <jcoxon> yes please
[15:32] <edmoore> rjw57: yo
[15:33] <jcoxon> edmoore, did you see the link i just posted?
[15:33] <jcoxon> a 817 controlled with an arduino shifting for sat doppler
[15:34] <edmoore> neat
[15:42] <edmoore> jcoxon: http://www.srcf.ucam.org/~cuspaceflight/wiki/doku.php?id=start#flights
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[15:50] <Laurenceb> hi
[15:56] <jcoxon> edmoore, did the launch yesterday follow the predicted path?
[16:07] <Laurenceb> Randomskk: http://ukhas.org.uk/code:4_state_extended_kalman_filter_in_matlab#component_state_vector_attitude_quaternion_code
[16:07] <Laurenceb> I rewrote it so its a bit easier to follow
[16:08] Nick change: \mct -> mct
[16:12] Action: Laurenceb needs some data with a magnetometer
[16:20] <jcoxon> its weird the way that if you listen to rtty too much you can hear it everywhere you go
[16:23] Action: SpeedEvil waits for jcoxon to start jumping out of the path of bullets.
[16:23] <jcoxon> hehe
[16:27] Action: Laurenceb is tempted to get one of the "razor" IMUs from sparkfun and hook it up to a laptop together with a ublox5 - then put it on a bike
[16:28] <Laurenceb> pointless but would be interesting
[16:35] <jcoxon> hehe
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[16:58] <Randomskk> Laurenceb: thanks! can't wait to get started with it
[16:58] <Randomskk> motor controller nearly done
[16:58] <Randomskk> then it will not be long at all until I can really get stuck into control code rather than just pcb routing
[16:58] <Randomskk> edmoore: getting the ic7000, yayay
[17:12] <Laurenceb> Randomskk: if you can cobble together 3 axes of gyro + accel + magno and record some data I'll have a go at doing bias estimation
[17:13] <Randomskk> okay, thanks. will get that hooked up some time shortly
[17:13] <Randomskk> going home tuesday so can probably do it then
[17:13] <Randomskk> I might load the data into matlab and have a play too, be interesting to see what it looks like
[17:13] <Randomskk> brb
[17:13] <Laurenceb> I'm not sure how practical invertic a 7x7 matrix is
[17:13] <Randomskk> I believe there are good ways of doing it?
[17:13] <Randomskk> that don't scale with n!
[17:14] <Laurenceb> good news, they dont scale with n
[17:14] <Laurenceb> bad news, they scale with n^3
[17:17] <Laurenceb> http://users.erols.com/mdinolfo/matrix.htm
[17:21] <Laurenceb> http://imgurl.filetac.com/img/99472500.png
[17:21] <Laurenceb> thats the end of the z axis and y axis
[17:43] <Laurenceb> - thats thye IMU just being held and tilted on different axes then placed back on the table
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[17:57] <jcoxon> Laurenceb, http://www.seeedstudio.com/depot/gps-bee-50-channel-ublox-5-p-560.html
[17:58] <Laurenceb> not as good as the falcom
[18:04] <Laurenceb> http://www.seeedstudio.com/depot/uart-camera-module-with-jpeg-compression-c328-p-209.html
[18:04] <Laurenceb> that on the other hand...
[18:05] <jcoxon> :-)
[18:05] <jcoxon> seeedstudio is a good pcb manufactuer
[18:05] <jcoxon> if you are happy for slow postage
[18:07] <Randomskk> :( they took almost all the silkscreen off my PCBs despite telling me they were fine and passed drc
[18:07] <jcoxon> mine was okay
[18:07] Action: Laurenceb uses batchpcb
[18:07] <Randomskk> also they shipped them via EMS instead of UPS despite paying for UPS?
[18:07] <Randomskk> and so they took like a month
[18:07] <Randomskk> so yea, that wasn't too great
[18:07] <jcoxon> yeah i went for cheapest possible
[18:07] <Randomskk> evidently the way to go :P
[18:07] <jcoxon> so mine cost $18 for 5 boards
[18:08] <Randomskk> I'll need to order some PCBs for my motor controller board
[18:08] <jcoxon> after my $12 discount
[18:08] <Randomskk> dunno who I'll use for that yet
[18:08] <Randomskk> need to finish designing them first :P
[18:08] <Randomskk> http://www.evilmadscientist.com/article.php/bulbdialkit
[18:08] <Randomskk> pretty snazzy
[18:09] <Laurenceb> Randomskk: batchpcb take about a month
[18:09] <Randomskk> Laurenceb: yea, I've used them twice now
[18:09] <Laurenceb> and the quality is pretty good
[18:09] <Randomskk> usually takes more like a month and half for me
[18:09] <Laurenceb> ok
[18:09] <Randomskk> also their online system is much much better than seeed's
[18:09] <Randomskk> the timing does depend on when you order and how many orders they get
[18:09] <Randomskk> though now they have a panel status thing telling you how full up it is
[18:09] <Laurenceb> yeah the system is nice
[18:09] <Laurenceb> yeah
[18:09] <Laurenceb> http://teamprometheus.org/movies/Blog.html
[18:10] <Laurenceb> interesting spin system, looks similar to my idea
[18:10] <Laurenceb> but very heavy and overengineered
[18:10] <Randomskk> battery does not look very well held in place in their final prototype :P
[18:11] <Laurenceb> heh
[18:11] <jcoxon> that team are powering along
[18:11] <Laurenceb> they are using a chipcon IC as I understand it
[18:11] <Laurenceb> yeah their plan looks good, but much more work than my design
[18:12] <Laurenceb> the animation is almost exactly what I had in mind
[18:13] <Laurenceb> very impressive polythene balloon construction as well
[18:14] <Laurenceb> Randomskk: I suspect they just chucked the battery on the scales as a weight reference
[18:15] <Randomskk> guess so
[18:15] <jcoxon> hehe, my old ibook that i reserected is so broken that the fan doesn't work
[18:15] <jcoxon> so it just managed to reach 82degC
[18:15] <jcoxon> better stop compiling stuff :-p
[18:16] <Laurenceb> my laptop reaches that if its running full out :-/
[18:17] <Laurenceb> temperature varies between 33C and 81 or so
[18:17] <jcoxon> apparently powerpc is capable of running hotter then intel so i'm not too worried
[18:18] Action: Laurenceb has AMD
[18:18] <jcoxon> okay x86
[18:18] <Laurenceb> its odd above 67C the fan powers down on my machine
[18:18] <Laurenceb> so it gets really hot
[18:18] <jcoxon> thats suicide mode :-p
[18:19] <Laurenceb> you have to kill some processes to get it stable again
[18:19] <jcoxon> "oh well i might as well go all out..."
[18:19] <jcoxon> Laurenceb, your laptop is crazy
[18:19] <Laurenceb> I'm not 100% convinced I trust the temperature sensor
[18:20] <jcoxon> right have got it down to 52
[18:21] Action: Laurenceb also has a dodgy USB stick :-/
[18:22] <Laurenceb> its only recognised adout 20% of the time when you plug it in
[18:22] Nick change: sbasuita__ -> sbasuita
[18:22] <jcoxon> weird
[18:22] <jcoxon> right cya all
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[18:22] <Laurenceb> well it was from tesco
[18:25] <Laurenceb> those promethius guys dont appear to realise the problem of getting the rocket horizontal for staging
[18:26] <Laurenceb> also they claim they can get 290 seconds ISP with solid
[18:26] <Laurenceb> not very sensible
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[18:52] <Laurenceb> still they could easily hit 100Km with that setup
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[20:03] <AlexBreton> sbasuita, see skype
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[22:47] <MikeMc68> evening
[22:50] <edmoore> hi MikeMc68
[22:52] <MikeMc68> hey
[22:58] <MikeMc68> anything happening this weekend?
[22:59] <edmoore> not as far as I know
[22:59] <edmoore> weather looks a bit grim
[22:59] <edmoore> http://www.srcf.ucam.org/~cuspaceflight/hourly-predictions/
[22:59] <MikeMc68> yeah
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[00:00] --- Sat Dec 5 2009