highaltitude.log.20090303

[00:03] <SpeedEvil> why 35V?
[00:04] <natrium42> they said to have higher rating for input
[00:04] <SpeedEvil> they said if using solid tant
[00:04] <SpeedEvil> so what's the 'real' input volts?
[00:05] <natrium42> 14V
[00:05] <natrium42> max
[00:05] <SpeedEvil> what's the in;put current?
[00:06] <SpeedEvil> http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=565-3150-1-ND ?
[00:06] <SpeedEvil> still pricy
[00:06] <natrium42> hmm, 2.4A max
[00:08] <SpeedEvil> err
[00:08] <SpeedEvil> not pricy
[00:08] Action: SpeedEvil was reading the 5's column
[00:08] <natrium42> not tantalum
[00:08] <natrium42> they recommend tantalum for low temp
[00:08] <SpeedEvil> or polymer ESR
[00:09] <SpeedEvil> solid polymer aluminium
[00:09] <natrium42> hmm
[00:09] <SpeedEvil> like that one
[00:09] <natrium42> do i still need the 100uF electrolyte?
[00:09] <SpeedEvil> they say 'max impedence ratio' 1.15 at -55C
[00:10] <SpeedEvil> that takes you to ~70mR
[00:10] <Laurenceb> where is php.ini located?
[00:10] <SpeedEvil> http://www.chemi-con.com/files/PXH.pdf
[00:10] <Laurenceb> sorry slightly offtopic
[00:10] <Laurenceb> trying to make php work...
[00:11] <SpeedEvil> natrium42: I was assuming this was the input cap
[00:11] <natrium42> i also had 100uF electrolyte in parallel
[00:12] <SpeedEvil> natrium42: ah
[00:12] <natrium42> and 47uF and another 47uF
[00:12] <natrium42> one on input one on output
[00:12] <natrium42> overkill?
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[00:14] <SpeedEvil> http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=565-3077-1-ND
[00:14] <SpeedEvil> maybe even
[00:14] <natrium42> 16V?
[00:15] <SpeedEvil> low ESR, cheap, well over the required ripple
[00:15] <SpeedEvil> It's what - 8*AA?
[00:15] <natrium42> yep
[00:16] <natrium42> but output still needs to have a tantalum, correct?
[00:16] <SpeedEvil> I don't think so.
[00:16] <SpeedEvil> These have lots better ESR than tantalym
[00:16] <natrium42> "Tantalum type capacitors may only used on the output bus, and are recommended for applications where the
[00:16] <natrium42> ambient operating temperature is less than 0°C"
[00:17] <natrium42> why do they recommend them for below 0C?
[00:17] <SpeedEvil> 'when the operating temperature is below 0C.....'for these applications, OS-CON, poly-aluminium, ...'
[00:17] <SpeedEvil> halfway up page 9
[00:18] <natrium42> that's for input
[00:18] <SpeedEvil> the above cap is specced at 1.1* its (low) ESR at -55C
[00:18] <SpeedEvil> 'output capacitor information'
[00:18] <SpeedEvil> 3rd para
[00:20] <natrium42> so do we trust page 8 or page 9?
[00:20] <SpeedEvil> Also
[00:20] <SpeedEvil> I think that the cap I just linked to is 4th on the table of recommended input/ouptu capacitors
[00:21] <SpeedEvil> 'tantalum capacitors may only be used on the output bus'
[00:21] <SpeedEvil> = you can't use them ont he input bus
[00:21] <SpeedEvil> it's not saying you can't use other technologies on the output bus
[00:22] <SpeedEvil> or it'd be 'only tantalum capacitors may be used on the output bus'
[00:23] <natrium42> 16V is too low, no?
[00:24] <SpeedEvil> The reason for doubling up when using tantalum is they have this pesky habit of exploding.
[00:24] <SpeedEvil> Especially when subjected to repeated inrush currents
[00:25] <SpeedEvil> page 8 para 5
[00:25] <SpeedEvil> the 2* is only for tantalum
[00:26] <SpeedEvil> For other usages, it's only really needed to push the voltage up if you're using them for a long time at high current at high temps and near the max volts
[00:26] <SpeedEvil> to improve reliability
[00:27] <natrium42> hmm, ok
[00:27] <natrium42> so one 150uF you linked to on input and one on output should do the trick?
[00:28] <SpeedEvil> I think so - I'm unsure why it says 'quantity <=4 on the output bus for that cap on table 3.
[00:28] <SpeedEvil> ah
[00:28] <SpeedEvil> output current
[00:28] <SpeedEvil> what output current are you using?
[00:30] Action: Laurenceb has to recompine apache
[00:30] <natrium42> i don't think i will ever exceed about 2.5A
[00:30] <Laurenceb> wonderful fun
[00:30] <SpeedEvil> Ah. I think the reason for specifying multiple caps is HF load-step performance, which we don't really care about.
[00:31] <SpeedEvil> one 150uF on input and output should do just fine.
[00:31] <SpeedEvil> (apply a 5A load in a nanosecond)
[00:31] <SpeedEvil> how much is this PSU module?
[00:32] <natrium42> cool, thanks!
[00:32] <natrium42> about CAD22
[00:32] <natrium42> too bad my PCB is for through hole caps
[00:32] <SpeedEvil> not bad.
[00:32] <SpeedEvil> :/
[00:32] <natrium42> but they are easy enough to hack into it
[00:38] <Laurenceb> can anyone help me with horrible php installation?
[00:38] <Laurenceb> http://www.softwareprojects.com/resources/programming/t-how-to-recompile-php-with-gd-support-on-a-live-serv-1572.html
[00:38] <Laurenceb> I'm following those instructions
[00:38] <Laurenceb> I got stuck at the libpng stage as ./configure would fail
[00:39] <Laurenceb> but reversing the order witht eh next instruction so I had zlib installed allowed configure to complete
[00:39] <Laurenceb> however how when I try to compile libpng it wont
[00:39] <SpeedEvil> the make is a lie
[00:40] <Laurenceb> /usr/local/lib/libz.a(crc32.o): relocation R_X86_64_32 against `a local symbol' can not be used when making a shared object; recompile with -fPIC
[00:40] <Laurenceb> /usr/local/lib/libz.a: could not read symbols: Bad value
[00:40] <Laurenceb> collect2: ld returned 1 exit status
[00:40] <Laurenceb> make: *** [libpng12.la] Error 1
[00:40] <Laurenceb> I havent got a clue :-/
[00:42] <Laurenceb> maybe I should apt-get install libpng?
[00:49] <natrium42> compiling is serious business.
[00:50] <Laurenceb> arg step 4 isnt working either
[00:50] <Laurenceb> ./libtool not found when I try to make
[00:50] <Laurenceb> I tried installing libtool and there is something of that name
[00:51] <Laurenceb> but it didnt help :(
[00:51] <Laurenceb> I installed libpng from the repository
[00:51] <Laurenceb> and scipped that step
[00:51] <natrium42> are you crosscompiling?
[00:52] <Laurenceb> hmm I'm on AMD64
[00:53] <Laurenceb> ./libtool --mode=compile gcc -O2 -I. -c ./jcapimin.c
[00:53] <Laurenceb> make: ./libtool: Command not found
[00:53] <Laurenceb> make: *** [jcapimin.lo] Error 127
[00:53] <Laurenceb> hang on that means its expecting libtool to be present
[00:54] <Laurenceb> hmm maybe I should read the install instructions that came with libjpeg
[00:56] <natrium42> why is it "./libtool" ?
[00:56] <natrium42> try "autoreconf --install"
[00:57] <natrium42> then ./configure
[00:57] <Laurenceb> command not found
[00:59] <Laurenceb> apt-get install libjpeg?
[00:59] <natrium42> sure
[00:59] <Laurenceb> oh hang on
[00:59] <Laurenceb> it needs special ./configure switches
[01:00] <Laurenceb> how do I get autoreconf?
[01:01] <natrium42> you don't need it, sorry
[01:02] <natrium42> just need to run configure
[01:03] <Laurenceb> already tried that :P
[01:04] <Laurenceb> just tried again and same thing
[01:04] <natrium42> why are you compiling php?
[01:04] <Laurenceb> dunno
[01:04] <natrium42> isn't there a binary?
[01:04] <Laurenceb> apparently I need to to be able to use libpng and libjpeg
[01:05] <Laurenceb> so I'm just following these instructions
[01:05] <Laurenceb> - so I can use pChart
[01:05] <Laurenceb> to do the graphics
[01:30] <Laurenceb> wow got it working
[01:30] <Laurenceb> #ubuntu helped me out :P
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[01:34] <SpeedEvil> :)
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[04:27] <natrium42> SpeedEvil, i traced the initial message to the STX2 portion of SPOT
[04:27] <natrium42> it does just use a STX2 interface
[04:27] <natrium42> need to go outside and trace the rest
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[07:58] <natrium42> hi edmoore
[07:58] <edmoore> yo
[08:00] <natrium42> sup?
[08:00] <edmoore> sleepy
[08:00] <edmoore> you?
[08:00] <edmoore> how're the PCBs?
[08:00] <natrium42> well, it's 3am
[08:00] <natrium42> good, just sent off digikey order
[08:01] <natrium42> did some more reverse engineering on the SPOT, it's going to be damn easy to hack
[08:01] <edmoore> awesome
[08:01] <edmoore> 3am = sleepy time soon surely?
[08:01] <natrium42> yep :)
[08:02] <natrium42> how is the rockoon project?
[08:03] <edmoore> sunday launch was fun and useful
[08:03] <edmoore> full steam ahead... after exams
[08:03] <natrium42> excellent
[08:03] <natrium42> how high did it go?
[08:05] <edmoore> just shy of 10,000ft
[08:05] <edmoore> 10,000ft being the allowable limit for that sight
[08:05] <edmoore> so a smaller motor and very much lighter than is optimal for max altitude
[08:05] <edmoore> right, need to bust a groove
[08:05] <edmoore> bbl
[08:06] <natrium42> k, later
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[08:10] <jcoxon> morning all
[08:10] <natrium42> hi
[08:11] <jcoxon> hey natrium42
[08:11] <jcoxon> cool about SPOT
[08:11] <natrium42> :)
[08:11] <natrium42> it's easy to put your own mcu too, just desolder theirs and the two switches
[08:12] <natrium42> just sent off the digikey order, $335 :S
[08:13] <natrium42> but it's enough for 3 flight computers
[08:13] <jcoxon> excellent
[08:13] <jcoxon> we are making great progress - with steve nearly done on the code for the radio
[08:14] <jcoxon> you with the flight 'puter
[08:16] <natrium42> yep
[08:17] <jcoxon> will pay for the valves hopefully today
[08:18] <jcoxon> then shall i send them over or keep then have work on the ballast tanks?
[08:19] <natrium42> are you going to assemble the tanks too?
[08:19] <natrium42> if yes, then it's a good idea to keep them
[08:22] <jcoxon> i'll have a play around with the valves and a mock up of the tanks
[08:22] <natrium42> k
[08:22] <jcoxon> might be easier if we found a generic tank type which you could get hold of as well
[08:22] <jcoxon> to save on shipping an empty tank
[08:22] <natrium42> yep
[08:24] <natrium42> lol --> http://i39.tinypic.com/291mahf.gif
[08:26] <jcoxon> hehe
[08:47] <jcoxon> natrium42, i'm just fixing up my radio altitude dial to report the altitude of the flight when we sort out the tracker
[08:48] <jcoxon> think i might add a nixie tube display for old schoolness
[08:50] <natrium42> hehe, would be awesome
[08:51] <natrium42> g'nite
[08:51] <jcoxon> night
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[10:54] <gordonjcp> natrium42: lol, sauce plx
[11:06] <SpeedEvil> No! A sequence of analog meters, stretching off into the distance, each indicating a more significant number.
[11:31] Action: SpeedEvil can't remember the name of that film.
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[12:40] <jcoxon> afternoon G8KHW_
[12:41] Action: jcoxon has just got hold of 2 valves for the ballast tanks
[12:51] <SpeedEvil> :)
[12:51] <SpeedEvil> the ones earlier discussed?
[12:52] <jcoxon> yeah
[12:52] <jcoxon> sensortechnicx X-valves
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[13:10] <jcoxon> hey natrium42
[13:11] <jcoxon> oh wait its quite early the other side of the pond
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[15:20] <Laurenceb> hello
[15:20] Action: Laurenceb has pCharts working
[15:20] <Laurenceb> really cool stuff
[15:24] <SpeedEvil> :)
[15:25] Action: SpeedEvil has http://allrecipes.com/Recipe-Tools/Print/Recipe.aspx?RecipeID=159370&servings=4&metric=true working
[15:25] Action: SpeedEvil will find if it's realy cool ina bit.
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[15:36] <SpeedEvil> http://www.nasa.gov/multimedia/imagegallery/image_feature_1295.html
[15:37] <SpeedEvil> 'Substantially larger than yours'
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[16:00] <shellevil> Ow.
[16:01] <shellevil> My balloon just fell on my head.
[16:01] <shellevil> (still rolled up
[16:01] <shellevil> Found some film in the attic
[16:02] <shellevil> Think it's ~25um HDPE
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[16:25] <SpeedEvil> Hmm. Nice. (above recipie)
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[16:46] <Laurenceb> natrium42: about?
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[17:35] <Laurenceb> hi jcoxon
[17:35] <Laurenceb> I have a php tracker page working
[17:36] <jcoxon> hey Laurenceb
[17:36] <Laurenceb> just trying to work out how to make it viewable online...
[17:36] <jcoxon> ooo a link?
[17:36] <Laurenceb> its behind the firewall
[17:36] <jcoxon> screenshot?
[17:36] <Laurenceb> if I could have a HTML page somewhere, and post the images to it...
[17:37] <Laurenceb> fraid not, at the research park atm
[17:37] <Laurenceb> where could I stick a HTML page?
[17:37] <gordonjcp> Laurenceb: want an account on my server?
[17:37] <jcoxon> hmmmm i could give you access to my laptop webserver
[17:37] <gordonjcp> caveat - have you got scp?
[17:38] <Laurenceb> think so
[17:38] <Laurenceb> just need a way to get the pngs to your server from my php page
[17:38] <Laurenceb> ie logfile ->php page on my machine ->pngs -> server -> viewable page
[17:39] <gordonjcp> Laurenceb: pm
[17:39] <Laurenceb> I'm not too hot with this sort of stuff
[17:41] <jcoxon> Laurenceb, surely more efficient would be to run the php page on a server with web access
[17:41] <Laurenceb> then Its run each time...
[17:42] <Laurenceb> - I'd have to copy over the logfile
[17:42] <jcoxon> a lot less bandwidth then sending pngs
[17:42] <gordonjcp> set yourself up an rsa key and then use scp?
[17:43] <gordonjcp> means you don't have to log in
[17:43] <Laurenceb> hmm the logfile will get quite big...
[17:44] <jcoxon> Laurenceb, tail the last line and send that
[17:44] <Laurenceb> yeah...
[17:45] <jcoxon> Laurenceb, i'm intrigued about this tracker page - wondering whether a version could be used for Atlantic Halo
[17:46] <Laurenceb> probably
[17:46] <Laurenceb> I'm not very good with css
[17:46] <Laurenceb> but if you created some container to match the graphs well it would be really professional
[17:46] <jcoxon> does it just generate a single image or does it update itself?
[17:47] <Laurenceb> single image
[17:47] <Laurenceb> but its easy to automate in a script
[17:48] <Laurenceb> really simple just set the page to refresh
[17:48] <Laurenceb> on gordonjcps server I'll set it up to run every few seconds
[17:48] <jcoxon> yeah
[17:49] <jcoxon> Laurenceb, the best setup possible i reckon would be:
[17:49] <Laurenceb> then the HTML pages will be seperate
[17:49] <jcoxon> radio-laptop-webserver on laptop serving up logfile ---- retrieved by big webserver which parses and generates graphs for internet
[17:51] <Laurenceb> yeah
[17:52] <Laurenceb> but that requires my laptrop to act as a server
[17:52] <Laurenceb> cant be tested on uni network
[17:52] <jcoxon> true
[17:52] <Laurenceb> I'll have to strip the last line, see if its changed then send it
[17:52] <Laurenceb> maybe a python script?
[17:53] <jcoxon> yeah, very similar to my client for hte distributed listener
[17:53] <Laurenceb> and then how do I stick it on then end of the servers file... ?
[17:53] <jcoxon> some rubbish code could probably be extracted from there
[17:53] <Laurenceb> oh actually thats simple
[17:53] <jcoxon> oooo you could POST it to the server
[17:53] <Laurenceb> right...
[17:54] <jcoxon> look at my python code
[17:54] <jcoxon> and how it interacts with rjharrison's server
[17:54] <Laurenceb> thing is I want an independant tracker at localhost
[17:54] <Laurenceb> uncase I lose internet
[17:54] <jcoxon> sure, then also have it locally
[17:54] <Laurenceb> so I'll have a php page running
[17:54] <Laurenceb> that could post things?
[17:55] <Laurenceb> you can use POST from php right?
[17:55] <jcoxon> yeah
[17:55] <Laurenceb> ok so I'll have a lastline session variable
[17:55] <jcoxon> how about a independent thingy tracker that directly reads your log file
[17:55] <Laurenceb> and see if its changed
[17:55] <jcoxon> and a python script to dump the last line via POST to a server
[17:55] <Laurenceb> hmm maybe
[17:56] <jcoxon> whith a timeout so if internet goes down it doesn't get upset
[17:56] <Laurenceb> nice to have it all in one pice of code at the groundstation
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[17:56] <jcoxon> or just use our python code and you'll have you data sent directly to the tracker
[17:56] <Laurenceb> if I POST the last line to the server, how does it appear at the server?
[17:57] <Laurenceb> yeah but it doesnt have much info
[17:57] <Laurenceb> I'll send to that as well of course :P
[18:01] <jcoxon> give us time, well add more features
[18:02] <jcoxon> the system is designed to accept as much data as you send after teh first few key bits and bobs
[18:02] <Laurenceb> hmm I'll try and get something working
[18:03] <jcoxon> cool cool
[18:03] <Laurenceb> if I use post to send text to a server, how does it appear at the server end?
[18:04] <jcoxon> right now?
[18:04] <jcoxon> as in POST to rjharrison's server?
[18:04] <Laurenceb> any server
[18:04] <Laurenceb> just trying to understand the mechanism
[18:04] <jcoxon> its sent as a string so raw it'll be a string
[18:04] <Laurenceb> then how do you retreive it at the server?
[18:05] <jcoxon> well the server will be expecting data to be sent to it
[18:05] <jcoxon> so you depends how you set it up
[18:05] <jcoxon> you are sending the data to a php script on the server
[18:05] <Laurenceb> so say I run a php file
[18:05] <Laurenceb> yeah
[18:05] <jcoxon> its an extension of forms with php
[18:05] <Laurenceb> oh so you use the POST data thingy in php ?
[18:06] <jcoxon> yes
[18:06] <Laurenceb> http://www.w3schools.com/php/php_post.asp
[18:06] <Laurenceb> like so
[18:06] <jcoxon> yeah
[18:06] <Laurenceb> so POST causes the server to run the php file as well?
[18:06] <Laurenceb> neat
[18:06] <jcoxon> so you are basically running the script remotely with the variables you give it
[18:06] <jcoxon> via a webbrowser
[18:06] <Laurenceb> yeah neat
[18:06] <jcoxon> then the server can play with it
[18:07] <jcoxon> rjharrison's server parses it and sticks into a mysql database
[18:07] <jcoxon> the raw stuff is here:
[18:07] <jcoxon> http://www.robertharrison.org/listen/view.php
[18:07] <jcoxon> then it gets put onto the tracker
[18:07] <Laurenceb> ok so I just need something at my end...
[18:08] <Laurenceb> my end could process things and just send through new packets
[18:08] <jcoxon> yeah
[18:08] <Laurenceb> that would make more sense
[18:08] <jcoxon> thats what my python code does
[18:08] <Laurenceb> ok cool
[18:08] <jcoxon> but feel free to adapt, or rewrite
[18:08] <jcoxon> it is a little bit of a hack
[18:08] <Laurenceb> right... I'd do it with my php file running at localhost
[18:08] <jcoxon> it just reads teh log file, checks a few things and then sends it to hte server via POST
[18:08] <Laurenceb> as that processing the logfile anyway
[18:09] <jcoxon> cool
[18:09] <Laurenceb> ok cool I get it
[18:09] <jcoxon> right bbl
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[18:09] <Laurenceb> ruight time to head off... Im going out but I'll have a look at this later
[18:09] <Laurenceb> thanks gordonjcp
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[18:45] <Laurenceb> hi
[18:45] <Laurenceb> I can only talk for 15 mins
[18:45] <Laurenceb> gordonjcp: you there?
[18:46] <gordonjcp> yup
[18:46] <Laurenceb> ok just firing up my machine...
[18:47] <Laurenceb> p8122www ?
[19:31] <natrium42> hi
[19:34] <Laurenceb> me off
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[19:56] <edmoore> fergusnoble: ping
[19:56] <fergusnoble> edmoore: hi
[19:57] <fergusnoble> henry and i are meeting at 9 to work on the talk
[19:57] <fergusnoble> chez moi
[19:57] <edmoore> cool, that's what i came on to ascertain
[19:57] <edmoore> just got the email
[19:59] <edmoore> i will try and park at the ifm
[19:59] <edmoore> I like the ofm, it's a good venue
[19:59] <edmoore> ifm*
[19:59] <edmoore> could probably be quite producting on the long bench down there
[19:59] <edmoore> productive*
[20:00] <edmoore> i was in the same virused toilet as iain today, and he came and got in contact with me straight after he got exposed. I will be fecked off if I start chucking up
[20:01] <fergusnoble> oh dear, maybe we should just skype you
[20:01] <edmoore> well if we do ifm, i can sit at one end of the work bench and you two at the other :)
[20:02] <fergusnoble> edmoore: would prefer my room, its nicer to work in
[20:02] <edmoore> fair do's
[20:02] <edmoore> i'll be there at 9 then
[20:02] <fergusnoble> anyway, got to make diner, see you around 9
[20:02] <edmoore> remind me which one it is? X something
[20:02] <fergusnoble> X12
[20:02] <fergusnoble> your sure your not virused?
[20:03] <edmoore> it's improbable
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[20:38] <jcoxon> evening all
[20:41] <edmoore> hi jcoxon
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[20:54] <natrium42> hey jcoxon
[21:04] <jcoxon> hey natrium42
[21:04] <jcoxon> paid for the valves
[21:04] <natrium42> cool
[21:05] <natrium42> digikey order shipped --> http://wwwapps.ups.com/tracking/tracking.cgi?tracknum=1Z78R8470400651536
[21:05] <natrium42> should get tomorrow
[21:05] <natrium42> and start soldering flight computer
[21:06] <natrium42> bbl
[21:09] <jcoxon> great
[21:14] <fergusnoble> natrium42: tis ed in fergus's room. do you have pictures of the pcbs?
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[22:07] <natrium42> edmoore, pics?
[22:07] <natrium42> i can make some
[22:07] <edmoore> that would be grad
[22:07] <edmoore> grand*
[22:08] <natrium42> alright
[22:12] Action: jcoxon has found some old aircraft gauges on ebay
[22:12] <natrium42> enough to build a cockpit?
[22:16] <jcoxon> enough to build a balloon dashboard
[22:16] <jcoxon> :-D
[22:33] <natrium42> edmoore, http://www.natrium42.com/gallery2/v/balloon/transatlantic/atlantic-halo-pcbs.jpg.html
[22:34] <edmoore> natrium42: awesome
[22:34] <edmoore> ferg and i want to know what we're looking at - what's the central chip?
[22:34] <natrium42> going to take pics of the spot hacking too
[22:34] <natrium42> atmega2560
[22:35] <natrium42> there are three DC/DC converters at the top
[22:35] <natrium42> bottom-left has microsd slot
[22:35] <natrium42> going to switch miscrosd between camera and mcu
[22:36] <edmoore> ah neat
[22:36] <edmoore> how?
[22:36] <natrium42> and downlink pictures using satellite phone that way
[22:36] <natrium42> just by sharing microsd lines
[22:36] <natrium42> and power cycling it after camera is turned off
[22:37] <edmoore> natrium42: where did you get the pcb's made?
[22:37] <edmoore> gf?
[22:37] <natrium42> goldphoenix
[22:38] <edmoore> they've done a nice job
[22:38] <edmoore> how many sq inches?
[22:38] <natrium42> yeah, they always do
[22:38] <natrium42> 155
[22:38] <natrium42> way too many copies, i don't need that many
[22:38] <natrium42> and they did it within 48hours as promised
[22:39] <edmoore> not bad]
[22:39] <jcoxon> natrium42, i'll have one ;-D
[22:39] <natrium42> :)
[22:39] <jcoxon> though i'm crap at soldering
[22:40] <natrium42> could always go the solder paste + skillet route
[22:40] <natrium42> though only for SMDs, of course
[22:41] <natrium42> bbl food
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[22:52] <Laurenceb> hi
[22:52] <jcoxon> hey Laurenceb
[22:54] <Laurenceb> G8KHW: can you put the MFSK code on the wiki?
[22:55] <Laurenceb> jcoxon: http://www.gjcp.net/~laurenceb/minirog.php
[22:56] <jcoxon> good work
[23:00] <shellevil> nat
[23:00] <shellevil> no reason you can
[23:01] <shellevil> t wave solder in a skillet too :)
[23:03] <natrium42> haha
[23:05] <Laurenceb> afk
[23:21] <jcoxon> night
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[23:26] <natrium42> edmoore, also http://natrium42.com/temp/gpsbee-a.jpg
[23:30] <Laurenceb> omg
[23:31] <Laurenceb> wow, hotplate?
[23:31] <shellevil> lau
[23:31] <shellevil> it's been done. I've got a pizza oven for that though
[23:31] <shellevil> A bit more controllable
[23:32] <Laurenceb> got a lock
[23:32] <natrium42> yep, electric skillet http://www.natrium42.com/gallery2/v/misc/IMG_2608.JPG.html
[23:32] <natrium42> shellevil, can you see the PCBs well though?
[23:35] <Laurenceb> natrium42: got a lock yet?
[23:36] <natrium42> nope, i think this antenna is mismatched
[23:37] <natrium42> got another one, but my 2nd venus chip is faulty
[23:42] <Laurenceb> :-/
[23:43] <natrium42> going to wait for more venus chips
[23:43] <natrium42> shellevil, http://www.natrium42.com/gallery2/v/balloon/transatlantic/spot-hacking.jpg.html
[23:45] <Laurenceb> why 2 convertors?
[23:46] <natrium42> i need to receive both lines: tx and rx
[23:46] <natrium42> to capture bidirectional communication
[23:48] <Laurenceb> ok
[23:48] <Laurenceb> remember mu FUGE ida?
[23:48] <natrium42> yeah?
[23:48] <Laurenceb> *idea
[23:49] <Laurenceb> yeah I took a bit more of a look
[23:49] <Laurenceb> I think its possible with a sparkfun 5DOF IMU and a melexis gyro
[23:49] <Laurenceb> then atmega324p for flight computer
[23:50] <Laurenceb> I counted all the clock cycles, 16ms for a kalman filter iteration at 20MHz
[23:50] <Laurenceb> so just possible
[23:50] <natrium42> neat
[23:51] <natrium42> might be easier to use a more powerful micro
[23:51] <Laurenceb> you'd need to temperature compensate the sensors, I think glueing them to copper plate with thermal epoxy would be good
[23:51] <Laurenceb> yeah
[23:51] <Laurenceb> then you know they are all at the same temperature
[23:52] <Laurenceb> looking at the datasheets, error should be <1 degree
[23:52] <Laurenceb> over +-20C
[23:52] <natrium42> so you could do a temperature profile?
[23:53] <Laurenceb> yeah
[23:53] <natrium42> hmm
[23:53] <natrium42> i always wanted to do a high altitude glider
[23:53] <natrium42> not sure what the legalities are
[23:54] <Laurenceb> its been done in canada before
[23:54] <Laurenceb> so I guess its legal there
[23:54] <natrium42> i hope so :D
[23:54] <natrium42> or that guy may have gotten a slap on the wrist
[23:55] <shellevil> natrium42: I've got it instrumented, and can do a controlled ramp
[23:56] <natrium42> coolz
[00:00] --- Wed Mar 4 2009