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[01:34] <juxta> hi all
[01:35] <SpeedEvil> hi
[01:38] Action: juxta is still waiting on approval to launch :(
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[02:08] <juxta> has anybody used brands besides energizer for lithium batteries?
[02:44] <SpeedEvil> Any thoughts on why a camera might have - in dark conditions when the gain is wound right up - a dark 'hole' of clear imagery in the middle, and a smooth shading to a brighter outside round it, gaining in intensity as you move out radially
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[09:28] <MikeMc> morning all
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[13:51] <Laurenceb> http://forum.sparkfun.com/viewtopic.php?t=18510&start=0
[13:51] <Laurenceb> interesting stuff
[13:51] <Laurenceb> the same technique for accels as well would be handy
[13:52] <Laurenceb> bias and gain cal for accels and magno axes just by moving into 6 different random positions
[14:09] <SpeedEvil> hmm.
[14:10] <SpeedEvil> interesting
[14:10] <SpeedEvil> simple, stupid, and probably not-too bad
[14:10] <Laurenceb> Im not convinced by their soft iron explanation
[14:10] <Laurenceb> the way I see it you have to consider stuff thats fixed to the body frame
[14:10] <SpeedEvil> not read it
[14:11] <Laurenceb> and stuff thats in the "world" frame
[14:11] <SpeedEvil> having net problems
[14:11] <Laurenceb> world frame e.g. manhole cover
[14:11] <SpeedEvil> and assumes field homogeneity of course
[14:11] <Laurenceb> body frame e.h. iron next to IMU
[14:11] <Laurenceb> it rotates with the IMU so isnt a simple rotation of the field
[14:12] <SpeedEvil> I know.
[14:12] <Laurenceb> basically the smart bit is fitting a spheroid to your 6 sensor output vectors
[14:12] <Laurenceb> then that gives you bias and sensitivty for each axis
[14:13] <SpeedEvil> sounds sensible.
[14:13] <SpeedEvil> The accels in the n900 aren't great, and are quite far off.
[14:13] <SpeedEvil> lis302dl
[14:13] <SpeedEvil> to the extent that a naive calculation can give results like never getting past 80 degrees rotation
[14:13] <Laurenceb> yeah the ST accels have quite a lot of bias drift
[14:13] <SpeedEvil> bias drift is OK
[14:13] <SpeedEvil> starting bias is bad though
[14:14] <Laurenceb> when I looked at it it seemed mostly aging and stuff
[14:14] <SpeedEvil> typ 40mG
[14:14] <Laurenceb> yeah
[14:14] <SpeedEvil> not to mention 16mG/bit
[14:14] <Laurenceb> it seems to be age related
[14:14] <SpeedEvil> I diddn't see that - it said they were largely stable over time
[14:14] <Laurenceb> and vcc
[14:14] <Laurenceb> hmm
[14:14] <Laurenceb> maybe I'm thinking of the wrong sensor
[14:15] <SpeedEvil> but it's definately an accel you only use as it's cheap
[14:15] <SpeedEvil> well - the tap recognition may be interesting
[14:16] <Laurenceb> http://www.rapidonline.com/Tools-Fasteners-Production-Equipment/Soldering-Equipment/Soldering-Stations/LF-369D-temperature-controlled-soldering-station/124633/kw/
[14:16] <Laurenceb> looks good value
[14:16] <Laurenceb> it is saying entire station for £48 right
[14:17] <Laurenceb> its not completely clear that everything is included, but looks like it is
[14:18] <SpeedEvil> yes.
[14:19] <SpeedEvil> Station is supplied complete with iron stand, tip cleaning sponge, fitted 13A plug and full instructions
[14:19] <SpeedEvil> or ... http://cgi.ebay.co.uk/KADA-852D-Rework-Digital-Station-SMT-SMD-Soldering-2in1_W0QQitemZ200406826828QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item2ea92d7f4c
[14:19] <SpeedEvil> For about 15-20 quid more
[14:21] <Laurenceb> the iron is temp controlled then?
[14:22] <SpeedEvil> the above?
[14:22] <SpeedEvil> the iron, and the hot air.
[14:22] <SpeedEvil> and flow control on the hot air
[14:22] <SpeedEvil> I've got one
[14:22] <Laurenceb> I see
[14:22] <SpeedEvil> though I've only used it for maybe 15h
[14:22] <Laurenceb> is the hot air any good?
[14:23] <Laurenceb> is that air gun combersome?
[14:26] <SpeedEvil> I find it to work OK
[14:26] <SpeedEvil> The gun is quite light
[14:26] <Laurenceb> is the hose pretty flexible?
[14:26] <SpeedEvil> It came with some useful tips for the gun too
[14:26] <SpeedEvil> yes - very
[14:26] <Laurenceb> ah thats handy
[14:27] <SpeedEvil> it could be longer - but...
[14:27] <Laurenceb> how long is that gun?
[14:27] <SpeedEvil> but it's about 80cm
[14:27] <SpeedEvil> the hose
[14:27] <SpeedEvil> err
[14:27] <SpeedEvil> 20cm?
[14:27] <Laurenceb> oh, pretty easy to handle
[14:27] <SpeedEvil> yeah - about that
[14:28] <Laurenceb> hmm you got from the same seller?
[14:28] <SpeedEvil> It's not a pencil - but it's by no means hard to hold or control
[14:28] <SpeedEvil> no
[14:28] <Laurenceb> how long for delivery?
[14:28] <SpeedEvil> I don't recall
[14:28] <SpeedEvil> it was about 2 weeks I think
[14:28] <SpeedEvil> there was an express ship - but...
[14:28] <Laurenceb> thats not bad
[14:29] <Laurenceb> do you have to keep solder paste refridgerated?
[14:31] <SpeedEvil> generally, yes
[14:31] <SpeedEvil> dx has some cheap paste - but I haven't used
[14:33] <Laurenceb> "Welcome to the Dragon Palace.I am Congling, the youngest girl-dragon. I am the Purple Dragon.I try to give you the best quality produc"
[14:33] <Laurenceb> the hell
[14:33] <Laurenceb> - feedback page for that ebay seller
[14:34] <Laurenceb> "I am cherry honored to serve you"
[14:35] <SpeedEvil> :)
[14:35] <SpeedEvil> The wonders of auto-translate
[14:39] <Laurenceb> can you get spare iron tips easily?
[14:45] <Laurenceb> http://www.justblair.co.uk/the-kada-852-smt-solderstation.html
[14:45] <Laurenceb> sounds good
[14:57] <Laurenceb> SpeedEvil: any idea on the bits?
[14:58] <Laurenceb> I saw some hits they may be compatible with HAKKO bits
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[16:02] <SpeedEvil> I got bits with it - lots of them - I asked at the time of purchas
[16:02] <SpeedEvil> first is fine after ~10h
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[19:48] <jcoxon> evening all
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[21:03] <bt42> http://www.diydrones.com/profiles/blogs/why-not-to-fly-near-airport
[21:04] <jcoxon> haha
[21:04] <jcoxon> naughty UAV
[21:04] <Randomskk> though it has to be said, getting video like that from a rc plane on autopilot is very cool
[21:05] <Randomskk> I like the hud
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[21:06] Action: jcoxon is running sims on his flight computer
[21:06] <jcoxon> fake gps :-D
[21:07] <jcoxon> currently we are at 9198m, ascentrate of 1.56m/s
[21:08] <Randomskk> hehe nice
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[21:09] <tonyb486> .
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[21:12] <jcoxon> oh wow - just realised that doug elison when he rx'd BH3 came 5th in >50Mhz rxing balloon records
[21:12] <jcoxon> oh poo, the records are in miles, we work in km
[21:12] <jcoxon> oops
[21:14] <jcoxon> right bbl
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[21:28] <RocketBoy> we should all be using god's units by now (SI)
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[21:31] <Laurenceb> RocketBoy: do you have any specs for the HF transmitter you made
[21:31] <Laurenceb> RF power out, heat dissipation, current consumption
[21:31] <Laurenceb> that sort of thing
[21:31] <Laurenceb> SpeedEvil: your N900 accels, its probably the "manufacturing" zero rate output variability
[21:32] <Laurenceb> Nokia probably didnt calibrate each one individually
[21:33] <RocketBoy> Laurenceb: I can do - but it all depends on how much it is used - i.e. how often and how long each message is
[21:34] <Laurenceb> yeah I was thinking in use and in "standby"
[21:34] <Laurenceb> we were thinking about battery sizing
[21:34] <Laurenceb> and insulation requirements
[21:34] <natrium42> hey jcoxon, sorry about missing the conference
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[21:35] <natrium42> have been quite busy with studies/work in the past weeks
[21:36] Nick change: DanielRichman -> Snomi
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[21:37] <Laurenceb> natrium42: do you have your 9DOF IMU yet?
[21:37] <natrium42> yes sir
[21:37] <natrium42> the next day after free day
[21:38] <natrium42> overnight shipping ftw
[21:38] <Laurenceb> any chance of recording some data?
[21:38] <natrium42> so you said i should modify it?
[21:38] <Laurenceb> oh yeah, remove the high pass caps
[21:39] <Laurenceb> http://ukhas.org.uk/general:code#imu_code
[21:39] <Laurenceb> if you stick the data there itd be perfect
[21:39] <natrium42> why does the sparkfun dude say that the next version will switch back to 8MHz?
[21:39] <Laurenceb> - bypass the high pass filters of all the gyros
[21:40] <natrium42> shall i switch the crystal also?
[21:40] <Laurenceb> as 16MHz is too high
[21:40] <Laurenceb> at 3.3v
[21:40] <Laurenceb> I'd go for 12mhz
[21:40] <natrium42> it's OC'd :P
[21:40] <Laurenceb> maximum poss is 13.33mhz at that voltage
[21:40] <natrium42> pfft, safety shmafety
[21:40] Action: natrium42 looks at schematic
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[21:43] <natrium42> Laurenceb, boo, they changed it
[21:43] <natrium42> http://www.sparkfun.com/commerce/product_info.php?products_id=9623
[21:43] <Randomskk> that's the new AHRS compatible version
[21:43] <Randomskk> w/ 8mhz and no HP
[21:44] <Randomskk> lol so also they removed the old version apparently
[21:44] <natrium42> :'(
[21:46] <natrium42> Laurenceb, according to schematic, high pass filter are resistors, not caps?
[21:47] <Randomskk> resistors don't make filters by themselves
[21:47] <natrium42> ah
[21:48] <natrium42> so short out the caps
[21:48] <Randomskk> yea, shorting the caps that are effectively in series with the signal will remove the hp
[21:49] <natrium42> that's super simple then
[21:50] <Randomskk> removing them and shorting the pads would be slightly better but it doesn't really make any difference
[21:50] <natrium42> yah, desoldering smt caps is easy
[21:50] <natrium42> just use a big blob of solder
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[22:10] <MikeMc> evening all
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[22:20] <jcoxon> hey natrium42
[22:21] <jcoxon> sorry was away from 'puter
[22:21] <jcoxon> yeah unfortunately no one was around for the 'conference'
[22:24] Action: MikeMc clears his throat
[22:25] <Randomskk> sounds like a nasty cough
[22:25] <MikeMc> yup
[22:25] <jcoxon> hey MikeMc
[22:28] <MikeMc> hey
[22:30] <jcoxon> hows it going? made it along to any more hackspace evenings?
[22:30] <MikeMc> no not for a while
[22:31] <MikeMc> i was hoping to go tonight but i have several thousand components to label and bag up ready for kits
[22:32] <jcoxon> i won't be able to attend for ages as am on placement
[22:34] <MikeMc> bummer
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[22:36] <jcoxon> we should put together a amateur balloon / arduino kit :-P
[22:36] <MikeMc> now that's not a bad idea
[22:37] <Randomskk> would require a name including "ardu"
[22:37] <Randomskk> balluino maybe
[22:37] <MikeMc> lol
[22:37] <Randomskk> arduoon?
[22:37] <jcoxon> perhaps avr + radiometrix+ temp sensor and exposed serial port
[22:37] <MikeMc> HASDuino
[22:37] <jcoxon> to attach a gps
[22:38] <Randomskk> HAduino - SD?
[22:38] <Randomskk> yea
[22:38] <Randomskk> or embed GPS
[22:38] <Randomskk> it's pretty essential
[22:38] <Randomskk> put on one of the venus chips or something
[22:38] <jcoxon> yeah but ups cost quite a bit
[22:38] <Randomskk> I guess people like to pick that themselves
[22:38] <Randomskk> well gps shield then
[22:38] <jcoxon> balloonuino
[22:39] <Randomskk> you could just make it as a shield for a normal arduino I guess
[22:39] <Randomskk> put the radiometrix and temp and a header for a gps
[22:39] <jcoxon> thats true
[22:39] <Randomskk> even cheaper and easier to make
[22:39] <Randomskk> perhaps some pyro controllers
[22:39] <Randomskk> just a transistor/mosfet and some pin headers'd suffice
[22:39] <jcoxon> yeah thats a good idea
[22:40] <jcoxon> Randomskk, 17718m, ascentrate 1.6m/s
[22:40] <jcoxon> :-p
[22:40] <Randomskk> hehe nice
[22:40] <Randomskk> sim code is fun
[22:40] <Randomskk> is it just feeding fake gps to your actual flight comp?
[22:40] <jcoxon> yeah
[22:40] <Randomskk> nice
[22:40] <Randomskk> do you listen on the radio? :P
[22:41] <jcoxon> nah it prints data back over the serial
[22:41] <jcoxon> but it is transmitting
[22:41] <jcoxon> just don't have my radio with me
[22:41] <Randomskk> ah fair enough
[22:42] <jcoxon> at the moment i'm running BH2, will also run BH1 and BH3
[22:42] <jcoxon> BH1 has no float, BH2 has a good float and BH3 is the wobbly float
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[22:47] <Laurenceb> heh ardutard names
[22:48] <Randomskk> hehe yup
[22:49] <Laurenceb> wow the new 9DOF IMU sold out already
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[23:02] <jcoxon> ping RocketBoy
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[23:02] <RocketBoy> jcoxon: yo
[23:05] <jcoxon> pm
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[23:29] <Laurenceb> http://www.thesiliconhorizon.com/cms/index.php?option=com_content&view=article&id=66&Itemid=57
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[00:00] --- Wed Jan 20 2010