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[08:32] <jcoxon> yup it works :-)
[08:37] <edmoore> i think yersterday a 'no result' broke it
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[09:27] <jcoxon_> damn wireless network
[09:27] <jcoxon_> keeps breaking
[09:31] <jcoxon_> back onto cable
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[13:31] <phatmonkey> list is down, sorry!
[13:31] <phatmonkey> be back soon
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[15:16] <Hiena> Good morning!
[15:17] <Laurenceb_> afternoon
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[16:24] <Laurenceb_> hi jcoxon
[16:24] <jcoxon> hey Laurenceb_
[16:26] <jcoxon> i broke my soldering iron :(
[16:26] <jcoxon> was changing the tip
[16:26] <jcoxon> and something inside must of shorted out (don't worry it was off and unplugged!)
[16:27] <jcoxon> but when i turned it on, it tripped the circuit breakers in my flat
[16:27] <Laurenceb_> woops
[16:27] <Laurenceb_> what make?
[16:28] <jcoxon> oh it was a cheap one
[16:28] <jcoxon> i thikn it was from maplin, got it ages ago
[16:28] <Laurenceb_> ah
[16:28] <Laurenceb_> I have an antex, it seems ok
[16:28] <jcoxon> i think its one of those
[16:28] <Laurenceb_> but I've gone through a few tips
[16:28] <jcoxon> oh well
[16:29] <Laurenceb_> they have antex in the labs at CUED
[16:30] <Laurenceb_> is there a maplin nearby?
[16:31] <jcoxon> sort of, i have to go to the library in waterloo tomorrow and there is one on the otherside of teh river
[16:31] <jcoxon> so i'll get a new one tomorrow
[16:31] <jcoxon> not been a great balloon weekend for me
[16:31] <jcoxon> my replacement GM862 doesn't work
[16:31] <Laurenceb_> are you sure?
[16:31] <jcoxon> but my GM862-GPS does - very strange as they claim backwards compatible
[16:32] <jcoxon> i literally swap them and don't get the same response
[16:32] <Laurenceb_> hmm odd
[16:32] <Laurenceb_> I'm not planning on going near it :P
[16:32] <jcoxon> was going to use my old breakout board and solder some of hte cables
[16:32] <jcoxon> yeah i'm a little disillusioned by them
[16:33] <Laurenceb_> I'd feel the same
[16:33] <jcoxon> the theory is good
[16:33] <jcoxon> and if it was a lassen iQ as the gps in the GM862-GPS then they would be incredible
[16:34] <Laurenceb_> I'm going to use the modules from mc-
[16:34] <Laurenceb_> he's persuaded me :P
[16:34] <jcoxon> haha
[16:35] <Laurenceb_> unfortunately it means a bodged pcb
[16:35] <jcoxon> good old mobile phones, they aren't light but they do work
[16:35] <jcoxon> might go back :-)
[16:35] <Laurenceb_> hehe
[16:35] <jcoxon> at the cost of the gm862 might as well use the gumstix + gpsstix + goliath
[16:35] Action: Laurenceb_ is revising atomic lattic compting
[16:35] <jcoxon> actually you don't need teh gps stix
[16:35] Action: Laurenceb_ still cant spell
[16:36] <jcoxon> got a GSM module and a ublox GPS on the goliath daughterboard + gumstix with usb and linux
[16:36] <Laurenceb_> NGW100
[16:36] <Laurenceb_> :P
[16:36] <Laurenceb_> I was thinking about making an experimental imu with an NGW100 actually
[16:36] <jcoxon> nah, while cheap still big
[16:37] <Laurenceb_> I cant work out how to have a process run at say 30hz
[16:37] <Laurenceb_> nanosleep would go some way to doing it...
[16:38] <Laurenceb_> how are interrupts handled in linux?
[16:38] <jcoxon> Laurenceb_, i'm not really sure
[16:38] <Laurenceb_> ok nvm :P
[16:38] <jcoxon> i guess if you wrote something for the kernel
[16:39] <Laurenceb_> hmm
[16:39] <jcoxon> kernel modules aren't too difficult
[16:39] <Laurenceb_> actually, I've compiled some
[16:39] <Laurenceb_> forgot about that :P
[16:39] <Laurenceb_> when I built the AVR32 kernel
[16:40] <jcoxon> i mean writing them
[16:40] <jcoxon> i've dabbled before in simple modules
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[16:40] <Laurenceb_> well... nanosleep might be good enough for simple tests
[16:41] <Laurenceb_> but I'll have a jitter of a few ms
[16:41] <Laurenceb_> however long one jiffy is
[17:06] <jcoxon> Laurenceb_, how import is an external oscilator on an AVR? for GPS comms?
[17:07] <Laurenceb_> for high altitude use, I'd recommend it
[17:07] <jcoxon> right
[17:07] <Laurenceb_> as your going to get temperature changes
[17:07] <jcoxon> which will effect the clock speed
[17:07] <Laurenceb_> yes
[17:08] <jcoxon> hmmmm maplin only do PICs
[17:08] <Laurenceb_> rapid, rs, or farnell do AVR
[17:08] <Laurenceb_> what are you planning? arduino based?
[17:08] <jcoxon> well, two things
[17:09] <jcoxon> firstly for my altiude dial i've got it wired up to my arduino right now
[17:09] <Laurenceb_> nice
[17:09] <jcoxon> and its connected via usb, reads off the Spirit of Knoxville website and displays teh altitude of SNOX V
[17:09] <jcoxon> (though its at 0 right now
[17:09] <jcoxon> )
[17:09] <Laurenceb_> haha high tech to low tech
[17:10] <Laurenceb_> neat
[17:10] <jcoxon> so i thought of doing a little embedded ATmega168
[17:10] <jcoxon> so you just plug in usb
[17:10] <Laurenceb_> cool
[17:10] <Laurenceb_> FTDI chip for the usb?
[17:10] <jcoxon> yeah
[17:10] <jcoxon> this is only early stages
[17:11] <Laurenceb_> wow its really hailing here
[17:11] <jcoxon> if i was going to do one i thought of getting a second (or more) to play with
[17:11] <Laurenceb_> about 7mm diameter
[17:11] <jcoxon> that said : http://www.arduino.cc/en/Main/ArduinoBoardLilyPad
[17:11] <Laurenceb_> you'll need a programmer
[17:12] <jcoxon> is an interesting idea
[17:13] <Laurenceb_> I've got a usb programmer that has ttl serial as well
[17:13] <Laurenceb_> are you going to do your own pcb design?
[17:14] <jcoxon> i've got a rs232 to ttl
[17:14] <Laurenceb_> aka transistors
[17:14] <jcoxon> Laurenceb_, i don't think so, i haven't really got the time/patience
[17:14] <Laurenceb_> its not too bad ;p
[17:14] <jcoxon> well its more an rs232 to any voltage you give it
[17:14] <Laurenceb_> waiting for it to arrive is a pain
[17:14] <Laurenceb_> so how do you control the altitude dial?
[17:14] <jcoxon> haha
[17:15] <jcoxon> PWM to vary the voltage through a resistor
[17:15] <Laurenceb_> and a capacitor :P
[17:15] <Laurenceb_> then its analogue?
[17:16] <jcoxon> yup
[17:16] <Laurenceb_> hmm
[17:16] <Laurenceb_> does that make it vulnerable to noise?
[17:16] <Laurenceb_> I mean, most of the altitude dials I've seen are multiturn
[17:16] <jcoxon> nah this isn't
[17:17] <Laurenceb_> cool, should work well then
[17:17] <jcoxon> yeah it works nicely
[17:17] <jcoxon> very smooth movement
[17:17] <Laurenceb_> with the arduino?
[17:18] <jcoxon> well the arduino just changes the voltage
[17:18] <jcoxon> and the dial moves
[17:18] <Laurenceb_> sounds groovy
[17:18] <jcoxon> and natrium's php script grabs the data
[17:18] <jcoxon> and just echos it down the usb to the arduino
[17:18] <Laurenceb_> its just a serial port right?
[17:19] <Laurenceb_> so you just have IO pin --> resistor --> coil ?
[17:19] <jcoxon> yeah
[17:19] <Laurenceb_> ooh nasty
[17:19] <Laurenceb_> you shouldnt really do that
[17:20] <Laurenceb_> the efm when you turn off could fry the avr
[17:20] <Laurenceb_> after the resistor, you should really put in a diode to gnd
[17:20] <jcoxon> probably a good idea
[17:20] <Laurenceb_> ie to allow current to flow from gnd to the line to the dial
[17:21] <jcoxon> when i was researching it was suggested to use a transistor
[17:21] <Laurenceb_> when you turn off the current, the inductance of the coil will mean it still wants to draw current
[17:22] <Laurenceb_> you can take up to 40ma from an avr pin, so that should be enough to drive a dial
[17:22] <jcoxon> yeah it doesn't need much
[17:22] <jcoxon> i should add a webcam and put it online
[17:22] <jcoxon> ahha
[17:22] <jcoxon> haha*
[17:22] <Laurenceb_> :P
[17:23] <Laurenceb_> excessively complex GUI
[17:23] <jcoxon> well it looks cool, i shall bring it along to launches
[17:23] <Laurenceb_> that reminds me, I should write a google earth script
[17:24] <Laurenceb_> but I cant run google earth on here :(
[17:26] <jcoxon> :-(
[17:26] <Laurenceb_> there is a way I think
[17:26] <Laurenceb_> just havent tried yet
[17:26] <Laurenceb_> the binary is for x86
[17:27] <jcoxon> yeah, makes sense
[17:27] <Laurenceb_> my system is AMD64
[17:27] <jcoxon> try nasa worldwind
[17:27] <Laurenceb_> eh?
[17:28] <Laurenceb_> ha cool
[17:28] <Laurenceb_> but does it take kml?
[17:29] <Laurenceb_> hmm its java based isnt it?
[17:30] <jcoxon> the new version is yeah
[17:30] <Laurenceb_> java isnt working properly on here either :/
[17:30] <Laurenceb_> altho thats certainly possible to fix
[17:31] <jcoxon> its not as detailed as google earth
[17:31] <jcoxon> but still does the job, and its a bit smoother i found
[17:31] <Laurenceb_> hmm I should really fix java
[17:33] <Laurenceb_> this is over my head... :-/
[17:33] <Laurenceb_> time to head to #ubuntu me thinks
[17:33] <jcoxon> hehe
[17:33] <jcoxon> i used to be on #ubuntu
[17:33] <jcoxon> in the early days
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[17:35] <Laurenceb_> well I'm attempting to reinstall
[17:35] <Laurenceb_> this is big
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[18:18] <Laurenceb_> hmm this is too hard :(
[18:19] <Laurenceb_> I value my sanity too highly
[18:19] <Laurenceb_> what a waste of time :(
[18:21] <Laurenceb_> looks like the only solution is to completely reinstall everything
[18:22] <Laurenceb_> the use icetea java
[18:22] <Laurenceb_> and it took me long enough to get flash working
[18:22] <Laurenceb_> I'm not redoing everything
[18:29] <Laurenceb_> it would require new sound drivers and everything
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[18:41] <edmoore> evening all
[18:44] <Laurenceb_> edmoore: greetings
[18:44] <Laurenceb_> http://amforth.sourceforge.net/
[18:44] <edmoore> nice :)
[18:45] <Laurenceb_> I cant see it being better than c
[18:45] <Laurenceb_> but its kind of cool
[18:45] <edmoore> ada is the thing to learn
[18:46] <Laurenceb_> yes
[18:46] <Laurenceb_> I'm bored :(
[18:46] <Laurenceb_> trying to revise....
[18:47] <edmoore> just did a ground test of a hybrid rocket
[18:47] <edmoore> loads of fun!
[18:47] <Laurenceb_> ?!?!122
[18:47] <Laurenceb_> sweeeetttt
[18:47] <Laurenceb_> I didnt realise you were ready to do that
[18:47] <Laurenceb_> what size?
[18:47] <Laurenceb_> where?
[18:48] <edmoore> I90 - not huge but pretty loud and fun
[18:48] <edmoore> in bucks
[18:48] <Laurenceb_> cool, is this for your rocketry certificate?
[18:48] <edmoore> going to form the basis of my parafoil tests - the parafoil pod will form the front of the rocket, which will take it on trips to ~1000ft
[18:48] <Laurenceb_> ah
[18:48] <edmoore> so we can do lots of fairly cheap drop tests with decent flight time
[18:49] <Laurenceb_> yes
[18:49] <edmoore> right, dinner
[18:49] <edmoore> ]bbl
[18:49] <Laurenceb_> who were you testing it with?
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[19:48] <Laurenceb_> hi edmoore
[19:48] <edmoore> hi
[19:48] <Laurenceb_> so, was this just a static test?
[19:48] <edmoore> yup
[19:48] <Laurenceb_> for fun?
[19:48] <natrium42> hi
[19:48] <natrium42> snox launch today, eh?
[19:48] <Laurenceb_> hi natrium42
[19:48] <edmoore> has it launched yet?
[19:49] <Laurenceb_> any sensors on it?
[19:49] <natrium42> 8PM EDT April 5. (0000 UTC 6 APRIL)
[19:49] <natrium42> dunno about sensors
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[19:49] <natrium42> but the irc chat room is getting fuller
[19:49] <Laurenceb_> I was asking edmoore
[19:49] <natrium42> oh
[19:49] <natrium42> nvm then :)
[19:50] <edmoore> remind me where the chat room is?
[19:51] <natrium42> oasis.liveharmony.org #SNOX
[19:52] <edmoore> ty!
[19:54] <edmoore> wooo
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[20:30] <Laurenceb_> ah the site is back up :P
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[20:46] <_johan_> Morning.
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[21:03] <Laurenceb> edmoore: msg
[21:03] <edmoore> monosodium glutamate?
[21:04] <Laurenceb> private message
[21:04] <Laurenceb> I sent you one
[21:04] <edmoore> yes
[21:04] <edmoore> sorry was CADing in windows
[21:04] <Laurenceb> got it?
[21:04] <Laurenceb> cool
[21:04] <edmoore> yes
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[21:50] <fnoble> hello
[21:50] <edmoore> hi
[21:50] <edmoore> SNOX launching soon
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[23:25] <jcoxon> evening edmoore
[23:25] <edmoore> yo
[23:25] <jcoxon> just set up my altitude dial
[23:25] <jcoxon> all ready for snox
[23:26] <edmoore> altitude dial?
[23:26] <jcoxon> the altitude meter thingy i've got
[23:27] <jcoxon> i borrowed natrium's php script to grab the altitude from SNOX V
[23:29] <edmoore> awesome
[23:31] <jcoxon> what time is the launch?
[23:33] <jcoxon> oh and do we know if ublox gps modules can exceed 18km?
[23:33] <edmoore> 1.00am our time
[23:33] <edmoore> not yet
[23:33] <edmoore> respectivaly
[23:34] <jcoxon> datasheet says the same as lassen
[23:34] <jcoxon> as in can exceed on of alt or velocity
[23:35] <edmoore> so does sirf III
[23:35] <jcoxon> oh really
[23:35] <edmoore> yeah
[23:35] <jcoxon> didn't know that
[23:35] <edmoore> but sirf has an unrelated software limit of 24km
[23:35] <jcoxon> right
[23:36] <edmoore> so I've contacted ublox to try and get a useful answer from someone technical
[23:48] <jcoxon> edmoore, http://www.inventeksys.com/shop/category.aspx?catid=2
[23:49] <jcoxon> check out the highaltitude custom firmware
[23:49] <jcoxon> though actually there isnt any more info on it
[23:50] <edmoore> min order required.... might be worth investigating
[23:54] <edmoore> oh my god Taxi Driver is on!
[23:54] <jcoxon> i just watched Sin City
[00:00] --- Sun Apr 6 2008