highaltitude.log.20080517

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[09:59] <jcoxon> morning all
[10:01] <edmoore> hi jcoxon
[10:03] <jcoxon> hey edmoore
[10:03] <jcoxon> so all working?
[10:03] <edmoore> how's it going this morn?
[10:03] <jcoxon> tired :-)
[10:03] <jcoxon> was out last night
[10:03] <edmoore> lol
[10:04] <edmoore> well it's working so far as i know
[10:04] <edmoore> the test program worked first time
[10:04] <edmoore> that's never happened to me before!
[10:04] <edmoore> about 30k of untested code on completely untested hardware
[10:04] <edmoore> so we've used up a lot of karma
[10:04] <jcoxon> that s amazing
[10:04] <jcoxon> yeah take is slowly from now
[10:05] <jcoxon> it*
[10:05] <edmoore> gps is happy as far as I know
[10:05] <edmoore> then i stopped for peep show
[10:05] <jcoxon> hehe
[10:05] <jcoxon> sounds all good
[10:05] <edmoore> but we'll probably have to make a precision bodge adjustment on the telit
[10:05] <edmoore> that pin we neglected to tie up that forces it into AT mode
[10:06] <jcoxon> DTR
[10:06] <edmoore> that's the one
[10:06] <jcoxon> amateurs
[10:06] <jcoxon> :-p
[10:06] <edmoore> can't win 'em all!
[10:06] <edmoore> but yes
[10:06] <edmoore> we'll enjoy testing the telit to death when the SF eval board arrives
[10:06] <jcoxon> full serial onboard?
[10:06] <edmoore> yeah
[10:07] <jcoxon> good plan
[10:07] <jcoxon> its such a faff otherwise
[10:07] <edmoore> yeah
[10:07] <jcoxon> i've wired up my telit now for AT operations
[10:08] <jcoxon> now need to make a connector to attach it to the gumstix
[10:09] <edmoore> yeah i was ahving a look for a nice compact inline connector
[10:10] <edmoore> the world doesn't really seem to be overflowing with them, unfortunately
[10:10] <jcoxon> yeah, DB9s are suprisingly big especially if you add a rear guard cover thingy to them
[10:11] <jcoxon> i only need to connect 4 wires
[10:11] <jcoxon> perhaps something can be converted
[10:11] <jcoxon> miniusb
[10:11] <jcoxon> hmmm
[10:11] <edmoore> 4?
[10:11] <edmoore> which are they?
[10:12] <jcoxon> from the telit i'm running GND, RX, TX and ON/OFF
[10:12] <edmoore> hrmm
[10:13] <edmoore> if you could live with 3 then a 3.5mm audio jack might work
[10:13] <jcoxon> ?
[10:13] <jcoxon> i quite like the idea that the gumstix can turn the module on and off
[10:14] <edmoore> yeah I agree
[10:14] <edmoore> oh well
[10:14] <edmoore> inline usb could well be a grand idea
[10:14] <jcoxon> something like a miniature IDE power supply cable
[10:14] <jcoxon> connector
[10:15] <jcoxon> ooooo usb2 are 5 pin
[10:15] <edmoore> you could make a molex up
[10:15] <edmoore> and sort of inline-ify it
[10:15] <edmoore> with some heat-shrinlk
[10:16] <jcoxon> hmmmm, want it today so was going to brave maplin
[10:17] <jcoxon> but they don't sell miniusb sockets
[10:17] <jcoxon> just teh plugs
[10:18] <jcoxon> stupid maplin
[10:19] <edmoore> could buy and doctor a usb from anywhere
[10:20] <jcoxon> true
[10:20] <jcoxon> i'll go and have a look, i think usb could be a nice space saving idea
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[11:00] <jcoxon> oooooo thats soo cool
[11:01] <jcoxon> usb mass storage works out of the box
[11:08] <jcoxon> that was just too easy
[11:56] <Hiena> jcoxon, now, put it back to the box.
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[13:49] <edmoore> hi jcoxon
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[14:30] <jcoxon> hey edmoore
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[14:48] <edmoore> hi jcoxon,Laurenceb
[14:48] <Laurenceb> hi
[14:48] <jcoxon> hey
[14:49] <edmoore> where about to telit what to do by tiring up DTR
[14:49] <edmoore> geddit??????????
[14:49] <edmoore> tieing*
[14:49] <Laurenceb> :P
[14:50] <jcoxon> oh dear
[14:50] Action: Laurenceb prefers cheap phones off ebay
[14:51] <Laurenceb> the firmware is probably more stable as well
[14:52] <jcoxon> depends if I write it or not
[14:52] <Laurenceb> haha
[14:52] <jcoxon> if i wrote it then yeah its pretty rubbish :-p
[14:52] <Laurenceb> well you seem to have had lots of problems
[14:52] <edmoore> you can have much higher gain antennas with m2m modules
[14:52] <edmoore> which is useful if it's right on the deck
[14:52] <Laurenceb> true
[14:52] <Laurenceb> but that hasnt really been an issue I dont think
[14:53] <jcoxon> Laurenceb, its the fact you have to blind debug and that when i changed models it had a completely different firmware missing tons of features
[14:53] <edmoore> it will be for us
[14:53] <jcoxon> stupid telits
[14:53] <Laurenceb> blind debug?
[14:53] <jcoxon> as either it works of doesn't
[14:53] <jcoxon> or*
[14:54] <Laurenceb> cant you print variables?
[14:54] <jcoxon> the debug errors don't come through
[14:54] <jcoxon> it compiles the script first and fails then
[14:54] <jcoxon> if dumps them out the other serial port
[14:54] <Laurenceb> right
[14:54] <jcoxon> however if the gps is on that then you don't get the info
[14:54] <Laurenceb> sucks
[14:55] <edmoore> this is why we're just keeping it dumb, I think
[14:55] <edmoore> with AT commands
[14:55] <edmoore> rather than pandoras box of making it try and think for itself
[14:56] <Laurenceb> hmm
[14:56] <Laurenceb> AT commands are hard enough :P
[14:56] <edmoore> pfff
[14:56] <Laurenceb> theres a million different interpretations
[14:56] <Laurenceb> and no documentation for your phone
[14:56] <edmoore> they're pretty well documented with the telit
[14:56] <Laurenceb> ok
[14:56] <jcoxon> the telit are very well documented
[14:57] <jcoxon> including the weird ones
[14:57] <edmoore> I lov the lassens
[14:57] <edmoore> their binary protocal is so much nicer than nmea
[14:57] <Laurenceb> took me about 4 days work to get it running on an ericcssoc
[14:57] <edmoore> it really has been thought up by people with their heads screwed on
[14:57] <Laurenceb> edmoore: how do you switch to binary?
[14:58] <edmoore> it has two serial ports, a and b
[14:58] <Laurenceb> sure
[14:58] <edmoore> the default settings are binary on port a, 9600 *-odd-1
[14:58] <edmoore> 8-odd-1
[14:58] <Laurenceb> ah
[14:58] Action: Laurenceb makes note to read the datasheet
[14:58] <edmoore> you can change all of that if you want, but that's the default
[14:58] <edmoore> the datasheet is nicely written
[14:59] <Laurenceb> sure, I have solder jumpers on my pcb so you can use both ports
[14:59] <edmoore> and explains how gps works - basically it was as if it were written for keen experimenters who want to use gps in fun ways
[14:59] <edmoore> rather than some dodgy engrish translation telling you what voltage to put in
[15:00] <jcoxon> haha
[15:00] Action: Laurenceb gets back to work
[15:00] <Laurenceb> < 4 weeks till finals :-(
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[15:01] <jcoxon> edmoore, got my usb memory stick working
[15:01] <fergusnoble> hi
[15:01] <fergusnoble> edmoore, not left yet? :p
[15:02] <edmoore> fergusnoble: part d) perform QR factorisation on bob's data set
[15:02] <edmoore> half way through
[15:02] <edmoore> and I might be half talking on irc too :p
[15:02] <jcoxon> grrrr found some nice 1.25mm pitch headers
[15:03] <jcoxon> but you need a stupid crimping tool
[15:03] <fergusnoble> edmoore, we have 33R resistors with legs but only 30R in smt
[15:04] <fergusnoble> think its ok to mix and match for the usb?
[15:04] <edmoore> what's this for - usb?
[15:04] <fergusnoble> ideally want an smt one underneath
[15:04] <edmoore> hmm, it'd be better if they were the same
[15:04] <Laurenceb> alice and bob?
[15:04] <edmoore> but i don't think their value is particularly critical
[15:04] <edmoore> hold on, i have just finished
[15:04] <edmoore> don't touch the soldering uron
[15:04] <edmoore> will be with you in 5
[15:04] <fergusnoble> ok
[15:05] <edmoore> bbl...
[15:05] <fergusnoble> heh, dont rush
[15:05] <jcoxon> is the digikey.co.uk actually uk based
[15:05] <edmoore> no
[15:05] <edmoore> but
[15:05] <Laurenceb> jcoxon: you can get away without crimping tools
[15:05] <Laurenceb> if you solder carefully
[15:05] <edmoore> it arrives day after next
[15:05] <edmoore> i.e. our stuff was sent monday night
[15:05] <edmoore> and arrived after wednesday morning lectures
[15:05] <edmoore> and with the strength of the pound, it might actually be worth it
[15:05] <edmoore> but they are suspicious of non americans
[15:06] <edmoore> gah, hold that though, i'll be back on irc when i arrive in ferg's room
[15:06] <edmoore> if he lets me
[15:06] <fergusnoble> you'll be slaving over a hot soldering iron
[15:06] <fergusnoble> and nothing else
[15:06] <fergusnoble> :p
[15:07] <edmoore> i like hot soldering irons
[15:07] <edmoore> ok right, LEAVING
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[15:49] <jcoxon> changed collegiate alligience?
[15:49] <edmoore> ]yes
[15:54] <jcoxon> http://www.flickr.com/photos/vliegerfototerschelling/2492432231/
[15:54] <jcoxon> sooo cool
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[16:54] <Cooleo64> GAH! My pulsejet wont light :(
[16:58] <Cooleo64> The Meths wont catch.
[16:58] <Cooleo64> Pfft
[17:12] <Laurenceb> too humidity
[17:18] <Laurenceb> *humid
[17:21] <Cooleo64> Or not enough o2
[17:24] <Laurenceb> the oxygen content of air is not going to change very much
[17:25] <Laurenceb> actually.... it might just make enough difference... a few % might be enough to stop the pulsejet working
[17:26] <Cooleo64> I didn't mean in the air, I ment not enough Oxygen getting into the Jar, Maybe the hole is too small. It lights once for one very very short burst., but then it stops
[17:27] <Laurenceb> I see
[17:28] <Cooleo64> Ill tackle it later, the meths has given me a headache
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[17:32] <Laurenceb> haha
[17:32] <Cooleo64> Hate the smell of it
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[21:04] <edmoore> jcoxon: now comes with multicoloured keds
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[21:17] <Akadecca> 1.5watt transmitter running at 12v
[21:17] <Akadecca> can i make any assumptions about the max current drawn?
[21:23] <jcoxon> edmoore, oooo exciting
[21:28] Nick change: Akadecca -> akawaka
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[21:58] <Laurenceb> edmoore: hows the badger badger mushroom going?
[21:59] <Laurenceb> badgers badgers badgers badgers mushroom mushroom... arrrrgggg its a snake
[22:01] <edmoore> snake is infact our error message
[22:02] <edmoore> just faffing with USB
[22:02] <edmoore> there's a lot to it... not a great deal of fun
[22:02] <Laurenceb> oh god
[22:02] <Laurenceb> I read some of the NTKernel documentation
[22:02] <Laurenceb> the USB looks horrendous
[22:03] <edmoore> welcome to us right now :)
[22:03] <edmoore> though I might call it a night fairly soon
[22:03] <Laurenceb> serial for me :D
[22:03] <Laurenceb> or ethernet
[22:05] <edmoore> ok so here are some pics of the badger
[22:06] <edmoore> just under 3 megs each but you're on a uni connection so you can put up with it
[22:07] <edmoore> http://www.srcf.ucam.org/~eam52/DSCF0509.JPG
[22:07] <edmoore> http://www.srcf.ucam.org/~eam52/DSCF0511.JPG
[22:08] <Laurenceb> hey not bad
[22:09] <Laurenceb> your routing is more sensible than mine :P
[22:09] <Laurenceb> and gold plated?
[22:09] <edmoore> yup
[22:09] <edmoore> mmmmmm
[22:10] <edmoore> notice the fact that we got the usb signals the wrong way round
[22:10] <edmoore> minor fix required :)
[22:10] <Laurenceb> he
[22:10] <Laurenceb> the ARM7 is soldered well
[22:11] <Laurenceb> is it a two layer pcb?
[22:11] <edmoore> yeah I think the random solder i stole from school is quite good
[22:12] <edmoore> with a fin tip it just seems to workl minimal wicking needed
[22:14] <Laurenceb> did you use the sparkfun library?
[22:14] <Laurenceb> for eagle
[22:15] <edmoore> yep
[22:15] <edmoore> except the accelerometer footprint is wrong
[22:15] <edmoore> grrrr
[22:15] <Laurenceb> :-(
[22:15] <Laurenceb> that could be troublesome
[22:15] <edmoore> but we need to make a v2 anyway, this was just a prototype
[22:16] <Laurenceb> oh well its better than my flight computer board
[22:16] <edmoore> it's all about olimex's golod plating
[22:16] <edmoore> makes pcbs look good, even if they're not
[22:16] <Laurenceb> http://wiki.ukhas.org.uk/_media/projects:ukhas_glider_project:pict9945.jpg <-- the routing is all wacky
[22:16] <Laurenceb> :P
[22:17] <edmoore> got a pic of the other side?
[22:18] <Laurenceb> fraid not
[22:18] <Laurenceb> my camera is broke
[22:18] <Laurenceb> http://wiki.ukhas.org.uk/_media/projects:ukhas_glider_project:mega324p2.png?cache=cache
[22:18] <Laurenceb> *en
[22:19] <Laurenceb> basically lassen iq and mega324p
[22:19] <edmoore> what's the coin cell for?
[22:19] <edmoore> batt backup?
[22:20] <Laurenceb> yes, for the lassen
[22:20] <edmoore> yeah, we haven't put one on
[22:20] <edmoore> probably should for v2
[22:20] <Laurenceb> it should make it easier to test, much faster lock
[22:20] <edmoore> yeah
[22:20] <edmoore> though you can offload it and save it
[22:20] <edmoore> which is what we'll do
[22:20] <edmoore> whack it on the sd card
[22:21] <Laurenceb> I should have added pads around the v reg
[22:21] <Laurenceb> to help cool it
[22:21] <edmoore> it's always about v2!
[22:21] <Laurenceb> he
[22:22] <Laurenceb> theres always glued on heatsinks
[22:22] <jcoxon> edmoore, so when are you taking orders?
[22:22] <edmoore> right, need to head back
[22:22] <edmoore> izza time
[22:23] <Laurenceb> but appaerently a SOT-23 can dissipate a few 100mw
[22:23] <Laurenceb> so probably just ok
[22:23] <Laurenceb> cya
[22:23] <edmoore> jcoxon: better wait till it all works :)
[22:23] <jcoxon> hehe
[22:24] <edmoore> fergus has just thrown it on the floor
[22:24] <edmoore> poor guy, solder fumes getting to him
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[22:24] <edmoore> we've had an odd policy for soldering
[22:24] <Laurenceb> :(
[22:24] <edmoore> every complex thing, like lpc2148 and telit connector, we've done half each
[22:24] <edmoore> for equal blame/glory
[22:24] <edmoore> it's like extreme coding, but extreme soldering
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[22:26] <jcoxon> urgh my soldering has gone down hill
[22:27] <Laurenceb> its all about the iron
[22:27] <Laurenceb> and mine is pants :(
[22:28] <Laurenceb> yet another item on the shopping list...
[22:28] <Laurenceb> bbl
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[23:59] <edmoore> jcoxon: can you give me the url for the logs?
[00:00] --- Sun May 18 2008