highaltitude.log.20090606

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[09:07] <rjharrison> hi all
[09:07] <rjharrison> anyone up yet
[09:08] <rjharrison> ! gone to bed
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[09:40] <rjharrison> Yo
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[12:23] <trialex> Hi guys. Looking for some suggestions for some pressure sensors. Looking for a simple 3.3V linear sensor I can use with a micro A/D converter to measure ambient air pressure within a payload.
[12:35] <rjharrison> Humm most won't go to the very low pressure
[12:36] <rjharrison> See sparkfun for sensors
[12:36] <trialex> yeah their sensor is neither cheap nor easy to use!
[12:45] <fergusnoble> its not too bad to use if you get it on the breakout board, but its a pain to solder by hand
[12:45] <fergusnoble> anyone good with fscanf?
[12:46] <rjharrison> ish
[12:46] <rjharrison> fergusnoble ish
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[12:47] <fergusnoble> ok, i have a file with csv values in it e.g. 1, 300, 34524, ...
[12:47] <rjharrison> Yep
[12:47] <fergusnoble> i want to read just the first two fields into variables
[12:47] <fergusnoble> i can't work out what to give as the format string
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[12:48] <rjharrison> 2 fields per line or 2 fields at a time?
[12:48] <fergusnoble> there are many fields on one line but yeah, i just want the first two
[12:52] <rjharrison> Ok leve it with me for a sec and I'll get it for you
[12:52] <fergusnoble> actually, just got it
[12:53] <fergusnoble> it was the obvious thing, dont know why I didnt try it
[12:53] <fergusnoble> hehe
[12:53] <fergusnoble> "%d, %d, "
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[13:01] <rjharrison> Yep
[13:01] <rjharrison> fergusnoble: hehe just got there
[13:01] <fergusnoble> hehe, sorry
[13:10] <jcoxon> http://www.sparkfun.com/commerce/product_info.php?products_id=9257
[13:10] <jcoxon> quite cool
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[15:32] <rjharrison> fergusnoble: fixed the bloody bearing
[15:32] <fergusnoble> oh cool
[15:32] <fergusnoble> what was it in the end?
[15:33] <rjharrison> i had converted lat and lon to rad and then did deg2rad(lon2-lon1)
[15:33] <SpeedEvil> Woo!
[15:33] <SpeedEvil> :)
[15:33] <rjharrison> and they were already in rad
[15:33] <SpeedEvil> pebak
[15:33] <rjharrison> Hi SpeedEvil
[15:33] <SpeedEvil> or similar
[15:33] <SpeedEvil> hi
[15:34] Action: SpeedEvil has just fixed his sink, and yesterday, a rotavator gearbox.
[15:34] <rjharrison> do rdiff should have been just (lon2-lon1)
[15:34] <rjharrison> cool
[15:34] <SpeedEvil> Neither I think directly related to ha.
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[19:57] <edmoore> DONE
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[20:59] <rjharrison> yo edmoore: what's done?
[20:59] <edmoore> BA
[20:59] <rjharrison> Cool
[20:59] <rjharrison> Congrats
[21:00] <edmoore> ta
[21:00] <edmoore> now for some ballooning
[21:00] <rjharrison> I like the simple but clear message
[21:00] <natrium42> edmoore, hey, congrats
[21:00] <natrium42> when's the ceremony?
[21:00] <edmoore> oh, not until end of next year, along with MEng
[21:00] <rjharrison> On a less significant note of done
[21:00] <edmoore> it's a 4 years MEng course, but should i decide to drop out now, I'd be a BA
[21:01] <natrium42> aah, i see
[21:01] <rjharrison> http://www.robertharrison.org/mobile.php
[21:01] <rjharrison> I implemented your request
[21:01] <natrium42> rjharrison, is steve launching this weekend?
[21:01] <rjharrison> natrium42: No I don't think so
[21:01] <rjharrison> Though the js has improved
[21:01] <natrium42> bah :(
[21:01] <edmoore> rjharrison: 'kin awesome
[21:02] <rjharrison> I want to test the tracker out with XOR corection
[21:03] <natrium42> yeah, finally no buggy positions hopefully :)
[21:07] <rjharrison> Yep I think I have that craked with the small errors been picked up by the XOR and the large ones by the validation and probability checks!
[21:07] <rjharrison> Infact I'm pretty confident only good data will get throught
[21:10] <rjharrison> edmoore: natrium42: Been having some fun today making pyros and doing some tests
[21:10] <edmoore> rjharrison: ooi, technical term is Hamming Distance - number of bit flips between two strings
[21:11] <edmoore> rjharrison: cool - same technique as steve?
[21:11] <rjharrison> edmoore: Not quite
[21:12] <rjharrison> I have gon for drilling one end only and embedding the string in the epoxy for the other end.
[21:12] <edmoore> ah cool - nice idea
[21:12] <rjharrison> I don't fancy drilling with powder in the tubes
[21:14] <SpeedEvil> See Richard Nakka's site
[21:14] <SpeedEvil> For sugar rocket design
[21:14] <SpeedEvil> which may inspire
[21:14] <natrium42> "and boom goes the dynamite" ?
[21:16] <natrium42> http://www.youtube.com/watch?v=W45DRy7M1no
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[21:27] <rjharrison> natrium42: My little men at attention http://www.robertharrison.org/files/pyro/IMG_1840.JPG
[21:27] <natrium42> whoa, those look great
[21:27] <natrium42> do they work?
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[21:31] <SpeedEvil> They are certainly prettier than any other cutdown I've seen.
[21:31] <rjharrison> natrium42: Yep too good actually
[21:32] <SpeedEvil> You could mix glitter in with the resin :)
[21:32] <rjharrison> I blew a tupperware / pcv sandwich box to bits when I put it over the top
[21:32] <rjharrison> Just cleaning up the mess in the kitchen
[21:32] <rjharrison> SpeedEvil: lol
[21:32] <SpeedEvil> what's the case?
[21:33] <rjharrison> Acryllic tube 10mm with 2mm walls
[21:35] <rjharrison> http://www.robertharrison.org/files/pyro
[21:35] <rjharrison> A few more construction pics in here
[21:36] <rjharrison> Off to watch a film with teh wife
[21:36] <natrium42> Up?
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[21:46] <rjharrison> I'll post some video of bangs tomorrow
[21:46] <rjharrison> DanielRichman: http://www.robertharrison.org/files/pyro/IMG_1840.JPG
[21:46] <DanielRichman> :O
[21:46] <DanielRichman> nice!
[21:47] <rjharrison> natrium42: Smokeless powder
[21:50] <natrium42> dunno if i can get it here
[21:50] <rjharrison> Alliant Powder
[21:51] <rjharrison> http://www.alliantpowder.com/products/powder/reloder7.aspx
[21:51] <SpeedEvil> Some webcams will go to >50fps if you make the window small enough
[21:51] <SpeedEvil> and light them well enough
[21:53] <natrium42> Casio EXILIM Pro EX-F1 can do 1200 fps
[21:58] <rjharrison> natrium42: http://www.alliantpowder.com/products/powder/reloder7.aspx
[21:59] <natrium42> not sure where i can get it here
[21:59] <rjharrison> Off 2 watch fim with wife
[21:59] <natrium42> kk, have fun
[21:59] <rjharrison> Ok though it looks like it's popular across the border
[21:59] <rjharrison> Just don't fly with it :)
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[23:28] <RocketBoy> When the CUSF predictor says "ERROR in second grib timestamp 1244289600 and 1244289600 should be 3*60*60 seconds apart" is it just downloading the new GFS model?
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[00:00] --- Sun Jun 7 2009