highaltitude.log.20111225

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[00:04] <daveake_> Well, happy crimbo to all on GMT :)
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[00:06] <Lunar_Lander> yea xD
[00:06] <daveake_> and GMT+n :)
[00:07] <Lunar_Lander> :)
[00:07] <Upu> aye I am going to official start Christmas by going to bed
[00:07] <Upu> nn
[00:08] <daveake_> nnupu
[00:09] <Lunar_Lander> good night Upu
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[04:23] <setpixel> hi
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[08:23] <daveake_> Just love the shot from the ISS (2nd to last in the sequence) from here - http://www.bbc.co.uk/news/science-environment-15546570
[08:30] <SamSilver_> daveake_: morning ... the pic of Atlantis, it is moving right to left?
[08:32] <SpeedEvil> Hmm.
[08:32] <SpeedEvil> At that point, the delta-v will be around 2km/s
[08:32] <SpeedEvil> I think
[08:32] <SpeedEvil> I guess that's actually a moonlit shot?
[08:33] <SamSilver_> morning SpeedEvil and is the light reflection or re-entry burn?
[08:33] <SpeedEvil> If it was a reflection, it wouldn't be moving in a curved path
[08:33] <SpeedEvil> As it would be quite close to ISS, and it doesn't move at high G, which would be implied by that
[08:34] <SamSilver_> ahh soo it is the headlights :p
[08:34] <SpeedEvil> the path is in reality straight I think, with a 2-3s frame time.
[08:35] <SpeedEvil> hmm
[08:35] <SpeedEvil> If I was feeling energetic enough, there are plenty of stars to work out the exact pointing during that shot.
[08:36] <SpeedEvil> The moon is clearly off to the right
[08:36] <daveake_> I was assuming it's an ionisation trail. The stars are spots so it's a short shutter time
[08:36] <SpeedEvil> yeah
[08:38] <SpeedEvil> Straight = a reentry path - I mean - it's not as grossly curved as the foreshortning makes it look
[08:38] <SpeedEvil> And there is a lot of zoom on that shot too
[08:38] <SamSilver_> I was thinking the curve is it decending
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[08:39] <SamSilver_> thus it is was moving right to left
[08:39] <SpeedEvil> It's decending slightly, but it's mainly - at that point - I think - maintaining altitude mosly, scrubbing off speed in the upper atmosphere.
[08:39] <SpeedEvil> but yes, it's going right-left.
[08:40] <daveake_> I wish I could aim my payloads this accirately - http://www.bbc.co.uk/news/world-europe-16326942 :)
[08:40] <daveake_> (Or spell better lol)
[08:40] <SamSilver_> a week at the ISS would have been a great xmass prezzie for me
[08:40] <daveake_> yep :)
[08:40] <SpeedEvil> I'd love the opportunity to make a few microsats.
[08:41] <SpeedEvil> You can make capable imaging sats in 10g
[08:41] <SpeedEvil> Admittedly not very capable.
[08:41] Nick change: soafee-chan -> spacekitteh
[08:59] Nick change: daveake_ -> daveake
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[09:23] <nosebleedKT> well, those 5v stepup actually dont spend to much energy. At first I was thinking ( as a noob always ) that those devices can eat your power sources
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[10:08] <fsphil> what a windy christmas morning!
[10:18] <fsphil> apollo 8, on christmas eve, took this pic: http://history.nasa.gov/ap08fj/photos/e/as08-13-2329.jpg
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[10:22] <Upu> ah the real one
[10:23] <Upu> talking of which I finally located my Full Moon book
[10:23] <Upu> http://www.amazon.co.uk/Full-Moon-Michael-Light/dp/0224063049/ref=sr_1_2?ie=UTF8&qid=1324808564&sr=8-2
[10:23] <Upu> collection of super hires photos
[10:23] <Upu> from apollo
[10:31] <daveake> nice
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[10:47] <fsphil> I loved those books full of pics from voyager and the like
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[11:10] <cuddykid> ditto
[11:18] <daveake> A similar shot to the one I posted earlier. Might be my new desktop b/g :-). http://nssphoenix.files.wordpress.com/2011/07/atlantis-reentry-from-iss.jpg
[11:19] <fsphil> ah, yea that was cool
[11:19] <fsphil> or indeed hot
[11:19] <daveake> :)
[11:20] <joph> this light over europe, was this a meteorite or space trash?
[11:20] <fsphil> booster stage of a russian launch
[11:21] Action: SpeedEvil wonders about tethered ariel wind-turbines again
[11:26] <nosebleedKT> I left the payload on the roof from last night, and now i went up to take and found it smashed. it fell of from the wind
[11:27] <nosebleedKT> antenna got a bad shape but the tronics in the payload where in position
[11:27] <SpeedEvil> Ooops.
[11:27] <nosebleedKT> we can say that a crashland test was also done :)
[11:41] <daveake> lol
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[11:44] <Darkside> woo my igate is running
[11:44] <Darkside> http://aprs.fi/info/VK5NEX-5
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[12:35] <fsphil> receiving anything?
[12:35] <fsphil> I don't think mine has in a few days
[12:36] <Darkside> oh yeah
[12:36] <Darkside> lots of local traffic
[12:41] <fsphil> I'm going to have to generate some of my own :)
[12:42] <Darkside> lol
[12:59] <fsphil> I'm still not sure how it works .. is it possible for a packet transmitted their to be repeated here?
[13:00] <Darkside> dunno
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[13:38] <Laurenceb_> http://www.osti.gov/bridge/purl.cover.jsp?purl=/105687-agW8wd/webviewable/
[13:39] <Laurenceb_> http://www.geekonfire.com/wiki/index.php?title=GPRS_Shield
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[13:59] <fsphil> for some reason I've ended up with a US cent. looks like a 1p coin
[14:02] <daveake> Don't spend it all at once
[14:03] <fsphil> tried to, no machine takes it ;)
[14:04] <Darkside> nn
[14:04] <fsphil> night!
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[16:31] <cuddykid> did Santa bring anyone any HAB stuff?!
[16:37] <SpeedEvil> I got some wind
[16:38] <SpeedEvil> Also possibly a windows phone.
[16:38] <SpeedEvil> In principle, I got it to dev on.
[16:38] <SpeedEvil> But the agreement is such that I can in fact if I choose sell it on ebay.
[16:38] <SpeedEvil> Or drop it ballistically from 100000 feet.
[16:39] <cuddykid> awesome
[16:39] <SpeedEvil> I have wondered how much speed you can get with a weighted streamlined dart from 30km
[16:39] <cuddykid> lol - enough to make a decent sized crater!
[16:50] <daveake> A Windows phone? Obviously Santa hasn't a clue about technology :)
[16:52] <cuddykid> haha daveake
[17:19] <SpeedEvil> David-g7waw: Fresh from nokia.
[17:35] <jonsowman> :P
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[17:58] <daveake> I did get a HAB-related gift - Richard Branson's "Reach For The Skies" book
[18:00] <SpeedEvil> I love his pickles.
[18:00] <daveake> LOL
[18:00] <daveake> Just reading about a manned balloon launched in 1785, with a hydrogen-filled outer section for the main lift, and a hot-air inner section for control, fed by a fire below. What could possibly go wrong ....
[18:01] <daveake> And it did. They died
[18:21] <fsphil> you'd wonder if they thought too much about it before
[18:21] <fsphil> or at all
[18:29] <daveake> indeed
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[18:48] <Laurenceb_> the Ti forum is epic
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[19:34] <FusionX> hi
[19:34] <SpeedEvil> It is
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[20:28] <nosebleedKT> epic ISS christmas: http://www.nasa.gov/multimedia/isslivestream.asx
[20:35] <SpeedEvil> Hat is awesome
[20:36] <SpeedEvil> Precession in a hat.
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[20:59] <Laurenceb_> 'solved' the tmp006 spikes issue
[20:59] <Laurenceb_> its reflected 630nm light heating the sensor
[20:59] <Laurenceb_> it heats the die unevenly and spikes the data
[21:00] <nosebleedKT> Laurenceb: cool but i wish i could understand u
[21:01] <fsphil> lol
[21:06] <FusionX> Doesn't feel good to ask this but I need a quick favor, anyone?
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[21:28] Nick change: UpuHome -> Upu
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[21:54] <SpeedEvil> Laurenceb: neat - I was right. :) The sensor normally has differential corrections for that, but the assymetry beats it?
[21:54] <FusionX> so, is that a no?
[21:54] <SpeedEvil> Hard to fix though
[21:54] <SpeedEvil> Well - I dunno.
[21:54] <SpeedEvil> If it's to eat a mince pie in your honor, then sure.
[21:55] <FusionX> Well, I don't have my CC and borderlands sale on steam is going to end in less than 2 hours, can anyone buy it for me?
[21:57] <SpeedEvil> Sorry, nope. No steam.
[21:58] <SpeedEvil> Laurenceb: I wonder if various green polythene would work
[21:58] <FusionX> SpeedEvil: *okay*
[22:06] <SpeedEvil> Actually - germanium windows are quite cheapish Laurenceb
[22:07] <SpeedEvil> And Ge seems to block visible entirely
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[22:14] <Lunar_Lander> what sensor exactly SpeedEvil?
[22:15] <Laurenceb_> interesting
[22:15] <Laurenceb_> yeah i was going to use some mylar to sheild it
[22:15] <Laurenceb_> Lunar_Lander: TMP006
[22:15] <SpeedEvil> TI's I2C IR
[22:15] <Laurenceb_> http://e2e.ti.com/support/other_analog/temperature_sensors/f/243/t/154826.aspx#561122
[22:15] <Lunar_Lander> ah
[22:15] <Lunar_Lander> what do you want to do with it?
[22:16] <Laurenceb_> read ze forum XD
[22:16] <Laurenceb_> currently trying to write interpolator
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[22:16] <Laurenceb_> which is confusing me a lot
[22:17] <Laurenceb_> http://pastebin.com/gafV43RR
[22:17] <Laurenceb_> it fails to find changepoints below the current index
[22:18] <SpeedEvil> Umm...
[22:18] <Laurenceb_> find the gradient by looking for the nearest ADC changepoints
[22:19] <SpeedEvil> Excite with a smoothly modulated sinewave, look at the magnitude of the second harmonic to pick of conductivity?
[22:19] <Lunar_Lander> will read it Laurenceb_, thanks
[22:19] <Laurenceb_> thats really slow
[22:19] <Laurenceb_> i tried that in simulation
[22:19] <SpeedEvil> Ah
[22:19] <Laurenceb_> i think sheild+better interpolator will help massively
[22:19] <Laurenceb_> but atm my brain fails at interpolator code
[22:20] <SpeedEvil> Ge window kills essentially all of the visible
[22:20] <SpeedEvil> and lets IR through
[22:20] <Laurenceb_> offset by one... somewhere
[22:21] <Laurenceb_> slp=quantest([0,0,1,1,1,2,2,2,3,5,4,4,4,4,4,4,2]')
[22:21] <Laurenceb_> 2 2 3
[22:21] <Laurenceb_> warning: division by zero
[22:21] <Laurenceb_> 3 2 6
[22:21] <Laurenceb_> 4 2 6
[22:21] <Laurenceb_> 5 5 6
[22:21] <Laurenceb_> warning: division by zero
[22:21] <Laurenceb_> 6 5 9
[22:21] <Laurenceb_> 7 5 9
[22:21] <Laurenceb_> 8 8 9
[22:21] <Laurenceb_> warning: division by zero
[22:21] <Laurenceb_> 9 9 10
[22:21] <Laurenceb_> warning: division by zero
[22:21] <Laurenceb_> 10 10 11
[22:21] <Laurenceb_> warning: division by zero
[22:21] <Laurenceb_> 11 10 17
[22:21] <Laurenceb_> 12 10 17
[22:21] <Laurenceb_> 13 10 17
[22:21] <Laurenceb_> 14 10 17
[22:21] <Laurenceb_> 15 10 17
[22:21] <Laurenceb_> 16 16 17
[22:21] <Laurenceb_> warning: division by zero
[22:21] <Laurenceb_> slp =
[22:21] <Laurenceb_> Columns 1 through 8:
[22:21] <Laurenceb_> 0.00000 0.00000 NaN 1.33333 1.00000 NaN 1.33333 1.00000
[22:21] <Laurenceb_> Columns 9 through 16:
[22:21] <Laurenceb_> NaN NaN NaN -1.33333 -0.90000 -0.83333 -0.91667 -1.20000
[22:21] <Laurenceb_> Columns 17 and 18:
[22:21] <Laurenceb_> NaN 0.00000
[22:21] <Laurenceb_> oops
[22:21] <Laurenceb_> sorry lol
[22:22] <SpeedEvil> :)
[22:22] <Laurenceb_> i meant to paste the pastebin of that
[22:22] <SpeedEvil> Is this pointing at one point, or scanning?
[22:25] <Laurenceb_> one point
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[22:26] <SpeedEvil> Ok - so geometric blocking won't work
[22:29] <Laurenceb_> but the active area on the sensor front is ~1mm^2
[22:29] <Laurenceb_> so mylar will work
[22:29] <SpeedEvil> How?
[22:29] <SpeedEvil> hmm
[22:29] <SpeedEvil> you're just thinking aluminised mylar across the front will kill visible?
[22:31] <Laurenceb_> itll kill visible from hitting the pcb and sides of the ic
[22:31] <SpeedEvil> ah
[22:31] <Laurenceb_> so the thermal mass of the unhit stuff will stabilise it
[22:31] <SpeedEvil> black paint?
[22:32] <Laurenceb_> huh? thatd make things worse
[22:34] <SpeedEvil> I mean to block the bottom of the sensor from visible
[22:35] <SpeedEvil> Oh - the mylar doesn't cover teh apature - I see
[22:35] <Laurenceb_> oh
[22:35] <Laurenceb_> yeah
[22:35] <Laurenceb_> ok i kind of got the interpolator to work - off by one error on negatives
[22:35] <Laurenceb_> but its still not optimal, theres got to be a way to do this
[22:36] <Laurenceb_> i can find the guassian noise on ambient by slowly changing the temperature until its between two bits
[22:36] <Laurenceb_> its about 0.1lsb
[22:36] <Lunar_Lander> so the sensor looks at a laser and you want to measure the flow passing by?
[22:37] <Laurenceb_> then theres rounding by the adc
[22:37] <Laurenceb_> if you treat that mathematically and use something like a kalman filter...
[22:37] <Laurenceb_> Lunar_Lander: yes
[22:38] <Lunar_Lander> what flows?
[22:38] <Laurenceb_> blood
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[22:38] <Lunar_Lander> oh
[22:39] Action: SpeedEvil wonders if you can use a finely pointed beam, and pick up the reflection from bloodcells.
[22:40] <SpeedEvil> Naah - only work for tiny surface capillaries if at all
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[22:47] <Lunar_Lander> hi and merry christmas daveake
[22:48] <daveake> Hiya
[22:48] <daveake> Seasons Greetings to you too :)
[22:49] <fsphil> hohoho!
[22:49] <Lunar_Lander> thanks :)
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[23:06] <number10> did you do the stats jcoxon, or eat Turkey?
[23:07] <jcoxon> happy christmas
[23:07] <jcoxon> no stats yet
[23:07] <jcoxon> quick write up on the wiki though
[23:09] <number10> just looking
[23:09] <number10> was fun
[23:10] <jcoxon> i'm keen to repeat it
[23:10] <jcoxon> though lighter payload so higher
[23:10] <jcoxon> thoughts/suggestions very welcome
[23:10] <daveake> with the single AAA?
[23:10] <jcoxon> yeah
[23:10] <daveake> good stuff
[23:11] <Lunar_Lander> hi jcoxon
[23:11] <Lunar_Lander> merry christmas
[23:13] <jcoxon> hey Lunar_Lander
[23:14] <number10> I will be happy to do the slow Hell... being a little slow myself
[23:14] <jcoxon> number10, got some good ranges
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[23:15] <jcoxon> number10, far further then with rtty, worth the effort
[23:16] <number10> I think so... I was wondering about doing a PSK31
[23:16] <jcoxon> thats not simple at all
[23:16] <jcoxon> :-)
[23:17] <number10> yes. most processors dont have a D/A
[23:19] <number10> but there are a couple of PSK31 beacon articles on the web
[23:19] <Lunar_Lander> is the NTX2 unable to work with 3.3V?
[23:19] <fsphil-laptop> works fine
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[23:36] <jcoxon> so what are peoples thoughts on my altitude graph
[23:38] <Lunar_Lander> thanks fsphil
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[23:49] <Lunar_Lander> damn
[23:49] <Lunar_Lander> I just tried to make an external thermometer by hooking two female-to-male wires in line
[23:50] <hibby> sounds kinky
[23:50] <Lunar_Lander> and then a DS18B20 at the top, the other end into the breadboard, where the 4.7k Ohm was
[23:50] <Lunar_Lander> and from there to the arduino
[23:50] <Lunar_Lander> and then the ON lamp went dim
[23:50] <Lunar_Lander> and a smell of something heating up was there
[23:50] <Lunar_Lander> I ripped the USB cable out
[23:50] <Lunar_Lander> then I put the sensor alone into the board
[23:51] <Lunar_Lander> and that works normally
[23:54] <Lunar_Lander> any idea what happened?
[23:54] <Lunar_Lander> arduino seems to have survived
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[00:00] --- Mon Dec 26 2011