highaltitude.log.20080521

[00:01] fnoble_ (i=fn217@pip.srcf.societies.cam.ac.uk) joined #highaltitude.
[00:01] Nick change: fnoble_ -> fergusnoble
[00:02] <fergusnoble> hello
[00:18] <Laurenceb> hi
[00:18] <Laurenceb> question
[00:18] <Laurenceb> I have x^2+y^2+z^2+xy+yz+xz=1
[00:19] <Laurenceb> how do I introduce new x' y' z' so that it simplifies to x'^2+y'^2+z'^2=1 ?
[00:38] appletizer (n=oreos@82-32-121-130.cable.ubr04.hawk.blueyonder.co.uk) joined #highaltitude.
[00:52] fergusnoble (i=fn217@pip.srcf.societies.cam.ac.uk) left irc: Remote closed the connection
[01:18] MetaMorfoziS (n=avr@3e44b94c.adsl.enternet.hu) left irc: Remote closed the connection
[01:36] Laurenceb (n=laurence@dhcp37-133.sthughs.ox.ac.uk) left #highaltitude.
[01:53] Tigga (n=chatzill@pc-232-235-60.magd.cam.ac.uk) left irc: Read error: 110 (Connection timed out)
[02:47] appletizer (n=oreos@82-32-121-130.cable.ubr04.hawk.blueyonder.co.uk) left irc: Nick collision from services.
[02:49] peartizer (n=oreos@82-32-121-130.cable.ubr04.hawk.blueyonder.co.uk) joined #highaltitude.
[02:49] Nick change: peartizer -> appletizer
[03:03] appletizer (n=oreos@82-32-121-130.cable.ubr04.hawk.blueyonder.co.uk) left irc: Remote closed the connection
[06:30] akawaka (n=akawaka@external.treyarch.com) left irc: Read error: 110 (Connection timed out)
[06:50] akawaka (n=akawaka@cpe-76-173-152-142.socal.res.rr.com) joined #highaltitude.
[06:56] natrium42 (n=alexei@CPE000625d867e2-CM0014045885be.cpe.net.cable.rogers.com) left irc: "pwned!"
[10:26] flowolf (n=flowolf@unaffiliated/flowolf) joined #highaltitude.
[10:32] akawaka (n=akawaka@cpe-76-173-152-142.socal.res.rr.com) left irc: Read error: 110 (Connection timed out)
[13:03] MetaMorfoziS (n=avr@3e44b94c.adsl.enternet.hu) joined #highaltitude.
[13:35] edmoore (n=edmoore@pomegranate.chu.cam.ac.uk) joined #highaltitude.
[13:58] edmoore_ (n=edmoore@pomegranate.chu.cam.ac.uk) joined #highaltitude.
[14:11] edmoore (n=edmoore@pomegranate.chu.cam.ac.uk) left irc: Read error: 113 (No route to host)
[14:18] edmoore_ (n=edmoore@pomegranate.chu.cam.ac.uk) left irc: Read error: 113 (No route to host)
[17:15] natrium42 (n=alexei@CPE000625d867e2-CM0014045885be.cpe.net.cable.rogers.com) joined #highaltitude.
[17:23] Akadecca (n=akawaka@cpe-76-173-152-142.socal.res.rr.com) joined #highaltitude.
[17:47] jcoxon (n=jcoxon@80.88.222.59) joined #highaltitude.
[17:48] Akadecca (n=akawaka@cpe-76-173-152-142.socal.res.rr.com) left irc: Read error: 110 (Connection timed out)
[17:58] Hiena (n=Hiena@81.93.195.181.datatrans.hu) joined #highaltitude.
[17:59] jcoxon (n=jcoxon@80.88.222.59) left #highaltitude ("Leaving").
[17:59] jcoxon (n=jcoxon@80.88.222.59) joined #highaltitude.
[18:52] akawaka (n=akawaka@external.treyarch.com) joined #highaltitude.
[18:54] jcoxon (n=jcoxon@80.88.222.59) left irc: "This computer has gone to sleep"
[19:13] Hiena (n=Hiena@81.93.195.181.datatrans.hu) left irc: "-=Halt!=-"
[19:16] edmoore (n=edmoore@chu-gw.churchillcambridge.co.uk) joined #highaltitude.
[19:20] edmoore (n=edmoore@chu-gw.churchillcambridge.co.uk) left irc: Client Quit
[19:44] flowolf (n=flowolf@unaffiliated/flowolf) left irc: "Leaving"
[19:55] <akawaka> anyone have a part number for the power connector on a floppy drive?
[20:00] <natrium42> molex something :D
[20:01] <akawaka> molex appears to be the 5.25" drive connectors
[20:02] <natrium42> i think molex makes those too, check their catalogue
[20:02] edmoore (n=edmoore@chu-gw.churchillcambridge.co.uk) joined #highaltitude.
[20:02] <natrium42> oh, have you seen the balancing connectors on li-poly batteries meant for R/C?
[20:02] <natrium42> maybe those would be a good choice
[20:04] <natrium42> http://www.aircraft-world.com/shopdisplayproducts.asp?id=33&cat=battery+-+WIRE+and+CONNECTORS
[20:05] <natrium42> how many leads do you need?
[20:05] <natrium42> i'd look at connectors being used in R/C since those people already worked out which ones are the best
[20:06] <akawaka> 3 leads
[20:06] <akawaka> 12v, 5v and gnd
[20:08] <akawaka> figured it would be handy to be able to hook up directly the pc power supplies
[20:10] <natrium42> right
[20:13] <natrium42> heh, the second-last commend is weird: http://natrium42.com/halo/flight2/
[20:13] <natrium42> "omg do my work for me for free, kthxbai"
[20:18] <edmoore> Question asked by audience member after a talk by mars exploration rovers lead: "How do you balance re-using systems and techniques that have already been proven, versus cool new things that are really tempting to do?"
[20:18] <edmoore> answer: "I'm a project manager. Cool New Things are never tempting to do."
[20:19] <edmoore> An absolutely fascinating talk. http://www.youtube.com/watch?v=Y7ZBLklsUys
[20:19] <natrium42> haha
[20:20] <natrium42> thanks, i will watch it later
[20:55] edmoore (n=edmoore@chu-gw.churchillcambridge.co.uk) left irc:
[21:06] <akawaka> so i need to use some kind of transistor to key this transmitter
[21:06] <akawaka> a transistor and an r/c network
[21:06] <akawaka> no idea how to design that
[21:28] jcoxon (n=jcoxon@80.88.222.59) joined #highaltitude.
[21:29] <jcoxon> evening everyone
[21:31] <akawaka> i built a morse code transmitter for our next balloon last night
[21:34] edmoore (n=edmoore@pomegranate.chu.cam.ac.uk) joined #highaltitude.
[21:39] <jcoxon> evening edmoore
[21:40] <edmoore> yo
[21:40] <akawaka> afternoon edmoore
[21:40] <jcoxon> how are things?
[21:40] <edmoore> not bad
[21:40] <edmoore> general revisiony day
[21:41] <edmoore> thinking about badgerv2 a bit
[21:41] <jcoxon> cool cool
[21:41] <jcoxon> oh yeah?
[21:42] <edmoore> it's nothing major
[21:42] <edmoore> just fixing everything in v1 once we've tested the crap out of it
[21:43] <edmoore> I guess it'll be more of a v1.2
[21:43] <jcoxon> how much did badgerpcb cost to have made?
[21:43] <edmoore> but it'd gotte work and get lots of flights under its belt
[21:43] <edmoore> not much
[21:43] <akawaka> badger?
[21:43] <edmoore> we only got 2 so i guess 10
[21:43] <edmoore> £10*
[21:43] <edmoore> but far cheaper if we got them in any quantity
[21:43] <edmoore> akawaka: our new flight computer
[21:44] <jcoxon> who did you use?
[21:44] <edmoore> http://www.srcf.ucam.org/~eam52/DSCF0509.JPG
[21:44] <edmoore> http://www.srcf.ucam.org/~eam52/DSCF0511.JPG
[21:44] <edmoore> actually, they're big
[21:44] <edmoore> 3mb each
[21:44] <edmoore> can give you a flickr link if you want
[21:44] <edmoore> jcoxon: olimex
[21:44] <edmoore> tho might go elsewhere for v2
[21:45] <jcoxon> oh right, pourquoi?
[21:45] <edmoore> routed round edges and red soldermask might be quite nice :)
[21:45] <edmoore> neither of which olimex offer
[21:45] <edmoore> http://www.goldphoenixpcb.biz/special_price.php
[21:45] <edmoore> these guys ^
[21:46] <jcoxon> oh ive seen them
[21:51] <natrium42> goldphoenix is nice
[21:51] <natrium42> i have ordered from them many times
[21:51] <edmoore> I've heard good things - so it's as painles as it sounds?
[21:52] <natrium42> yeah
[21:52] <natrium42> and they can do it *fast* if you pay extra
[21:52] <natrium42> which came quite handy :)
[21:52] <edmoore> lol
[21:52] <natrium42> that badger board looks great btw
[21:54] <natrium42> goldphoenix also does assembly if you ever need it
[21:54] <natrium42> for quite reasonable price
[21:56] <edmoore> natrium42: I think we can neaten up the routing and do things a bit more logically for the next one - but I guess there's be something up if we didn't learn from v1! The board is about 90% capable of doing an entire mission with just a battery and some pyros, and I think it has a bit of an identity crisis because of that.
[21:57] <edmoore> I think we should either decide it needs a daughter board and offload a load of stuff, or try and get a radio and battery charging circuit all on the v2
[21:57] <edmoore> if we switch to 4 layers, I'm sure it'd be very possible, just at greater expense
[21:58] <jcoxon> have you seen pcb pool?
[21:58] <edmoore> yep
[21:58] <jcoxon> looks pretty much like the sparkfun outfit but in Ireland
[21:58] <natrium42> edmoore, could always leave unpopulated footprints
[21:58] <edmoore> yeah - may well give them a bash
[21:58] <edmoore> natrium42: my thoughts entirely
[21:59] <edmoore> we've populated it more since that photo was taken
[21:59] <natrium42> personally, i would cram everything possible on the smallest area possible :D
[21:59] <edmoore> I don't suppose we'll populate the second identical board
[21:59] <edmoore> natrium42: currently it fits in an altoids tin
[21:59] <natrium42> neat
[21:59] <edmoore> I reckon we could get everything, including batt, into an altoids tin, if we drank enough coffee
[21:59] <natrium42> haha
[22:00] <natrium42> what's the power draw?
[22:00] <edmoore> anyhoo, the priority now is to learn everything we can from this'n
[22:00] <edmoore> hrm
[22:00] <edmoore> well
[22:00] <edmoore> gps is 35mA const
[22:00] <edmoore> telit is, as you know, dependant on what it's doing
[22:00] <edmoore> arm is about 20mA
[22:00] <edmoore> that's about it
[22:01] <natrium42> right, just wondering how small a battery you could use
[22:01] <edmoore> yeah
[22:01] <edmoore> we could cut down a ,ot on the arm draw
[22:01] <edmoore> just doing the standard balloon flight control only keeps it busy 10% of the time
[22:01] <edmoore> if that
[22:02] <natrium42> the telit can also sleep most of the time
[22:02] <edmoore> yeah
[22:02] <edmoore> will probably turn it off above gsm altitudes
[22:03] <edmoore> we'll switch to microSD for sure
[22:03] <edmoore> that'll save a whole bunch of space
[22:03] <edmoore> do such things as surface mount terminals exist?
[22:04] <natrium42> for?
[22:04] <edmoore> i'd quite like some high current IO, but the telit takes up so much space that it rules out through-hole on the other side of it
[22:06] <natrium42> oh, you can just solder through hole connectors onto smt pads on the edge of the board
[22:06] <natrium42> just make them big so that it doesn't lift the pads...
[22:06] <edmoore> oh that's quite cunning
[22:06] <edmoore> good idea
[22:07] <natrium42> :)
[22:08] <edmoore> i'd love a row of pcb mount sma connectors. But that'd mean going to solder-on gps and telit. It'd save space but be a lot more complex
[22:10] <edmoore> keep telling myself KISS though
[22:10] <edmoore> fergus is a good voice of reason
[22:10] <edmoore> whenever i feel myself getting carried away I go and try and 'persuade' him my idea, but actually in the hope he'll dissuade me of it
[22:10] <edmoore> which he usually does
[22:11] <jcoxon> haha
[22:42] <edmoore> bbl
[23:09] MetaMorfoziS (n=avr@3e44b94c.adsl.enternet.hu) left irc: "Báj báj szása."
[23:13] jcoxon (n=jcoxon@80.88.222.59) left irc: "Leaving"
[23:33] Kornholijo (i=kornholi@c-f3f472d5.09-99-73746f40.cust.bredbandsbolaget.se) left irc: Remote closed the connection
[00:00] --- Thu May 22 2008