highaltitude.log.20070213

[00:05] jcoxon (n=jcoxon@jac208.caths.cam.ac.uk) joined #highaltitude.
[00:13] edwardmoore (n=edwardmo@pomegranate.chu.cam.ac.uk) left irc:
[00:18] jcoxon (n=jcoxon@jac208.caths.cam.ac.uk) left irc: "Leaving"
[00:31] defy (n=defy@60-234-174-220.bitstream.orcon.net.nz) joined #highaltitude.
[06:58] icez (n=icez@ip68-3-56-121.ph.ph.cox.net) left irc: Remote closed the connection
[07:07] edwardmoore (n=edwardmo@pomegranate.chu.cam.ac.uk) joined #highaltitude.
[09:42] jcoxon (n=jcoxon@jac208.caths.cam.ac.uk) joined #highaltitude.
[11:50] Ebola (n=Ebola@host86-142-178-37.range86-142.btcentralplus.com) joined #highaltitude.
[14:07] icez (n=icez@ip68-3-56-121.ph.ph.cox.net) joined #highaltitude.
[14:57] icez (n=icez@ip68-3-56-121.ph.ph.cox.net) left irc: Remote closed the connection
[15:05] edwardmoore (n=edwardmo@pomegranate.chu.cam.ac.uk) left irc: Read error: 113 (No route to host)
[16:10] edwardmoore (n=edwardmo@pomegranate.chu.cam.ac.uk) joined #highaltitude.
[19:03] rocketboy (n=steve@217.47.75.148) joined #highaltitude.
[19:11] <jcoxon> evening all
[19:16] <rocketboy> hiya jc
[19:16] <edwardmoore> hi
[19:16] <jcoxon> hows everything going?
[19:17] <rocketboy> I found that bug in my code - it was a typical "C" problem
[19:17] <jcoxon> :-)
[19:17] <jcoxon> well at least you found it
[19:18] <rocketboy> yeah - it was obvious after I found it
[19:18] <rocketboy> always the way
[19:18] <jcoxon> yup
[19:19] <jcoxon> edwardmoore have you delivered those connectors to henry yet?
[19:19] <jcoxon> i'm waiting to steal them for Peg V
[19:19] <edwardmoore> what was the c problem?
[19:19] <edwardmoore> the wretched lab is always locked
[19:19] <jcoxon> :-0
[19:19] <rocketboy> if was if(i = CONSTANT) rather than if(i == CONSTANT)
[19:20] <rocketboy> the thing is that although its valid C the compior should really warn about it
[19:20] <rocketboy> compiler
[19:21] <edwardmoore> sorry was on phone
[19:22] <edwardmoore> yes that's the standard bug
[19:22] <rocketboy> in C = is assignment and == is test of equivelence
[19:22] <edwardmoore> and it real;ly should sort itself out on that one
[19:22] <edwardmoore> same in c++
[19:23] <edwardmoore> we use the gcc compiler which lets anything pass so long as it's not in chinese charcters
[19:23] <rocketboy> yeah - a warning at least - actually if(i = j) is OK but if(i = CONSTANT) is a giverway bug
[19:23] <edwardmoore> it's a bit unix-ey and unhelpful
[19:24] <jcoxon> rocketboy, i've written a morse code generator for my gumstix
[19:24] <jcoxon> it uses the memory register or something like that to toggle a GPIO far quicker
[19:26] <edwardmoore> how did you do it previously?
[19:27] <jcoxon> using a system call to change a proc entry
[19:27] <jcoxon> but with that you could only use sleep in seconds
[19:27] <jcoxon> i can now use usecs
[19:27] <edwardmoore> so is the memory register the actual port pin?
[19:27] <edwardmoore> like how most uControllers have all their ports as special function registers?
[19:28] <jcoxon> no idea - i copied an example :-p
[19:28] <edwardmoore> lol
[19:28] <jcoxon> i'm sure the wiki explains it
[19:28] <edwardmoore> will have a looksee
[19:28] <edwardmoore> right i need to dash out for a drink. will be back later.
[19:29] <jcoxon> cya
[19:29] <rocketboy> jc - did you ever test open cell and closed cell polystyrene in a vacuum?
[19:29] <rocketboy> any difference?
[19:29] <jcoxon> sort of
[19:29] <jcoxon> in africa we got the lab in the UK to wack some in
[19:29] <jcoxon> basically we found it blistered on the surface and also wasn't as strong
[19:29] <jcoxon> thats closed cell
[19:30] <jcoxon> which is pretty much what yours did
[19:30] <rocketboy> yeah
[19:30] <jcoxon> i could do more tests i guess - when i get a spare moment
[19:30] <jcoxon> just take an email to get some time with the vacuum tank
[19:30] <rocketboy> - closed cell is wheer there are no gaps between the cells - right?
[19:31] <jcoxon> i actually though that closed cells had actually pockets
[19:31] <jcoxon> and so low pressure causes forces and such to break them
[19:31] <rocketboy> ah - I see
[19:32] <jcoxon> thats what i assume it is
[19:32] <rocketboy> I have a small homebrew vacuum chamber here - I'll give it a go when I get some time
[19:34] <rocketboy> I was looking for some sheet EPS today - I found B&Q doo some (closed cell) 25mm and 50mm sheets - I'm really looking for somthing in-between - any suggestions?
[19:35] <jcoxon> hmmmm - sorry
[19:35] <jcoxon> material is actually my biggest issue
[19:35] <jcoxon> i usually end up using scrap stuff
[19:35] <jcoxon> which is pretty rubbish
[19:37] <rocketboy> yeah - I was looking for somthing a bit more re-producable
[19:37] <rocketboy> I can always get odds and ends - but if you want to make a few identical payloads your stuck
[19:38] <jcoxon> my main issues is not having something to cut with
[19:38] <jcoxon> got a glue gun now
[19:38] <jcoxon> but need to make a cutter
[19:38] <jcoxon> then i can get some sheets
[19:39] <rocketboy> I made a hot-wire cutter from some resistance wire from maplins (echh spit0
[19:39] <jcoxon> hehe
[19:39] <jcoxon> something for me to do during the holidays i reckon
[19:40] <jcoxon> not sure college would be to happy :-p
[19:40] <rocketboy> I got loads - if you want a few meters i can pop some in the post
[19:40] <jcoxon> :-)
[19:40] <jcoxon> i'll take you up on the offer but not yet
[19:40] <jcoxon> once i get home for hte easter holidays
[19:41] <rocketboy> Its very strong - I have done a lot of cutting and it hasn't broken yet
[19:41] <jcoxon> thats good
[19:41] <rocketboy> no probs
[19:42] <rocketboy> Its quite low resistance - I had to make a low voltage (3V) transformer up (using an old torroidal transformer)
[19:42] <rocketboy> I should put it up on the wiki
[19:42] <jcoxon> oooo that would be amazing
[19:42] <jcoxon> the wiki is really comming along now
[20:43] <rocketboy> I added my hot wire cutter to the wiki
[21:00] <rocketboy> BBL - watching life on Mars
[22:18] edwardmoore (n=edwardmo@pomegranate.chu.cam.ac.uk) left irc:
[22:22] mc- (n=mfcastle@cpc2-glfd1-0-0-cust995.glfd.cable.ntl.com) joined #highaltitude.
[22:38] jcoxon (n=jcoxon@jac208.caths.cam.ac.uk) left irc: Read error: 110 (Connection timed out)
[22:59] rocketboy (n=steve@217.47.75.148) left irc: "Leaving"
[23:04] Ebola (n=Ebola@host86-142-178-37.range86-142.btcentralplus.com) left irc: "BED"
[23:10] mc- (n=mfcastle@cpc2-glfd1-0-0-cust995.glfd.cable.ntl.com) left irc:
[23:44] icez (n=icez@ip68-3-56-121.ph.ph.cox.net) joined #highaltitude.
[00:00] --- Wed Feb 14 2007