highaltitude.log.20080302

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[00:15] <edmoore> hi jcoxon
[00:15] <edmoore> ty for the email
[00:16] <jcoxon> :-)
[00:16] <edmoore> are you coming up here anytime soon?
[00:18] <jcoxon> well
[00:18] <jcoxon> maybe
[00:18] <jcoxon> might be up tomorrow
[00:19] <jcoxon> as i'm going home for mothers day and there is yukky trains home, might be quicker to go to cambridge
[00:19] <jcoxon> would you be around?
[00:34] <edmoore> we're at ears tomorrow
[00:35] <edmoore> but i'll be in town briefly from about 5-6 i guess
[00:35] <edmoore> ish
[00:35] <edmoore> maybe
[00:35] <jcoxon> okay
[00:35] <edmoore> is that any use?
[00:35] <jcoxon> well if i do end up being in cambridge i'll give you a call
[00:43] <jcoxon> you launching tomorrow?
[00:55] <edmoore> yes
[00:55] <edmoore> jcoxon: sorry, had my sound turned off
[00:55] <edmoore> we're going for level 1 rocket
[00:55] <edmoore> rather thyan balloon
[00:55] <edmoore> from ears
[00:55] <edmoore> am with fnoble, just getting a mac version of a serial bootloader working for arm
[01:02] <jcoxon> cool cool
[01:03] <jcoxon> right i'm off to bed
[01:03] <jcoxon> edmoore, thanks for all the stuff with firefly
[01:03] <jcoxon> might see you tomorrow
[01:03] <jcoxon> night
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[07:54] <jcoxon> morning all
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[08:01] <jcoxon> morning edmoore
[08:01] <edmoore> yo
[08:01] <edmoore> sup?
[08:02] <jcoxon> not much
[08:02] <jcoxon> just updating ukhas
[08:03] <jcoxon> now that i've got my ads on my site - trying to drive as much traffic as possible :-p
[08:07] <Laurenceb> morning
[08:07] <Laurenceb> you capitalists
[08:07] Action: Laurenceb shakes his head
[08:07] <jcoxon> Laurenceb, got to pay for my hosting
[08:07] <Laurenceb> hehe only joking
[08:07] <Laurenceb> good plan
[08:08] <jcoxon> actually i got sent some money a couple of months ago
[08:08] <jcoxon> if only i had had it for pegasus I
[08:08] <edmoore> lol
[08:08] <edmoore> so this is why you want to be one make :p
[08:09] <Laurenceb> I'm probably going to have to help my mum out with her car :S
[08:09] <Laurenceb> if only I was stinking rich :(
[08:09] <jcoxon> edmoore, hehe, i don't think firefly warrents Make
[08:10] <edmoore> one day!
[08:10] <Laurenceb> I saw Make was getting panned recently
[08:10] <jcoxon> when it works :-p
[08:10] <jcoxon> i miss their project weekends - without Bre its a little boring
[08:10] <Laurenceb> due to someone posting "breasts in a box".... I wont go any further
[08:11] <Laurenceb> it involves boxes and rc servos
[08:11] <jcoxon> haha
[08:11] <Laurenceb> but there is some good stuff on there
[08:11] <Laurenceb> like the environmental testing chamber
[08:12] <jcoxon> oh i think the blog is a great collection of projects
[08:12] <Laurenceb> I've built mine now btw
[08:12] <jcoxon> its better then hackaday as it gets more projects (though hackaday does have quality control)
[08:15] <Laurenceb> I like the shopping trolley jammer
[08:24] <jcoxon> urgh, i hate the way the postman just gives up if he can't fit things through my letter box
[08:25] <Laurenceb> missed something?
[08:26] <jcoxon> when ever i get a package i'm never home so have to get it redelivered
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[08:26] <jcoxon> i've got a nice CF GPS unit on its way
[08:27] <jcoxon> which is going to make a very cheap TTL SIRF II GPS
[08:27] Action: jcoxon is yet to test this theory but he thinks its just a Cf-serial adapter + a GPS
[08:28] <Laurenceb> right cool
[08:28] <Laurenceb> how cheap?
[08:31] <jcoxon> ?16
[08:31] <jcoxon> but is off ebay so you probably could get cheaper
[08:36] <Laurenceb> nice
[08:36] <Laurenceb> http://www.b3tards.com/u/a609ede35986cfd048a1/28-days-later-mail.jpg
[08:37] <jcoxon> hehe
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[08:44] <Laurenceb> http://wiki.ukhas.org.uk/projects:aerosol_code
[08:45] <Laurenceb> hopefully a little closer to working...
[08:53] <jcoxon> edmoore, you around?
[08:53] <edmoore> yes, but not for too much longer
[08:53] <edmoore> shoot
[08:53] <jcoxon> i might be able to come to cambridge this afternoon
[08:56] <Laurenceb> jcoxon: any idea why "finally:" gives me an error in python?
[08:58] <jcoxon> nope
[08:58] <Laurenceb> it works from with python
[09:03] <Laurenceb> hmm you can use ! right?
[09:04] <Laurenceb> ie if !myfunction():
[09:04] <jcoxon> yeah i think so
[09:04] <jcoxon> hmm i'm confusing languages
[09:04] <jcoxon> i'm in ruby mode right now
[09:04] <jcoxon> google is your friend
[09:04] <Laurenceb> oh I think you use not
[09:11] <jcoxon> right i better be off
[09:18] <Laurenceb> cya
[09:19] <Laurenceb> http://wiki.ukhas.org.uk/projects:aerosol_code
[09:20] <Laurenceb> seems to be free of typos, but I'll need the hardware to test it fully
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[09:44] <neontube> hi all
[09:44] <neontube> long time no see
[09:59] <Laurenceb> hey there
[10:05] <neontube> how goes it
[10:06] <neontube> do u remmember richard elliott ?
[10:20] <Laurenceb> yes
[10:20] <Laurenceb> what he up to these days?
[10:25] <neontube> hes working at the pool in ashbourne
[10:25] <neontube> also part time poliec
[10:25] <neontube> was getting the goss about you in kandersteg :P
[10:58] <Laurenceb> right
[10:59] <Laurenceb> I never went
[11:00] <Laurenceb> aerosol project is coming on - http://wiki.ukhas.org.uk/projects:aerosol
[11:00] <Laurenceb> right breakfast time
[11:45] <Laurenceb> back
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[12:28] <jatkins> hi all
[12:31] <Laurenceb> hello
[12:31] <Laurenceb> say do you want to make a camera unit for our upcoming launch?
[12:32] <jatkins> I was thinking about it, but I don't think it would be very useful
[12:32] <jatkins> just one still digital camera
[12:33] <jatkins> thanks though
[12:33] <Laurenceb> it'd be good for us to get some photos
[12:33] <jatkins> when's the launch?
[12:33] <jatkins> i.e. rough schedule
[12:33] <Laurenceb> 1 to 2 weeks
[12:34] <jatkins> I'm hoping to get up my payload in that time frame
[12:34] <jatkins> if I get mine done in a week or so, and you haven't launched yet, you can use it
[12:34] <jatkins> (the camera)
[12:35] <Laurenceb> thanx
[12:35] <jatkins> btw, did I show you the magnetic cutdown idea a while ago?
[12:41] Action: jatkins I've been thinking about using relays
[12:41] <jatkins> http://wiki.ukhas.org.uk/_detail/ideas:magnetic_cutdown_relays.png?id=ideas%3Amagnetic_cutdown&cache=cache
[12:58] <Laurenceb> interesting
[12:59] <Laurenceb> I'm not 100% convinced, looks heavy
[13:00] <Laurenceb> http://wiki.ukhas.org.uk/_media/projects:dscn1015.jpg?cache=cache
[13:01] <Laurenceb> thats what I'm using
[13:03] <jatkins> ok
[13:03] <jatkins> you don't think the idea of magnetic cutdown would work in general or the use of relays?
[13:03] <Laurenceb> hot resistor cutter, very light
[13:04] <Laurenceb> relays work well
[13:04] <jatkins> ok
[13:04] <jatkins> http://wiki.ukhas.org.uk/ideas:magnetic_cutdown
[13:04] <jatkins> that's a better description
[13:04] <Laurenceb> but mosfets are good for most things
[13:04] <jatkins> ok
[13:04] <Laurenceb> you need to think about the direction of the field
[13:05] <jatkins> ok
[13:05] <Laurenceb> it would be better to stick the magnet on the end
[13:05] <jatkins> of the magnetic field?
[13:05] <Laurenceb> yes, wikipedia it
[13:05] <jatkins> and sandwich it horizontally
[13:05] <jatkins> ?
[13:06] <Laurenceb> http://en.wikipedia.org/wiki/Amp%C3%A8re%27s_circuital_law
[13:06] <Laurenceb> yes, pretty much
[13:08] <jatkins> have you ever launched a balloon without cutdown? I'm just thinking it would help me launch quicker to leave it out
[13:08] <Laurenceb> not a good idea
[13:08] <Laurenceb> personally I've never done that
[13:09] <Laurenceb> you can make a resistor cutter in 30 minutes
[13:09] <jatkins> is it the law or just to prevent it getting blown out to sea?
[13:10] <Laurenceb> the latter
[13:10] <jatkins> ok
[13:10] <jatkins> a resistor cutter being hot-wire cutdown?
[13:10] <Laurenceb> but a couple of mosfets off rapid
[13:10] <jatkins> yeah
[13:10] <Laurenceb> resistor cutters are easier to make
[13:11] <jatkins> ok, I'll probably do that
[13:11] <Laurenceb> you can run the gate off a "gpio"
[13:11] <jatkins> ok
[13:11] <jatkins> what type of cord connecting the payload to the balloon is best?
[13:12] <Laurenceb> then emittor > gnd , and collector > ten ohm resistor > Vcc
[13:12] <jatkins> ok
[13:12] <Laurenceb> nylon kite line
[13:12] <jatkins> ok
[13:12] <jatkins> like rocketboy sells?
[13:12] <Laurenceb> but strip some insulation off solid code wire for the actual cutter
[13:12] <Laurenceb> any old kite will do :P
[13:12] <jatkins> ok
[13:13] <jatkins> thanks
[13:13] <Laurenceb> not wanting to take away rocketboys trade :P
[13:13] <jatkins> lol
[13:14] <Laurenceb> I have some dracon that was bought for part of some space mission, but you dont have to go that hi tech
[13:14] <jatkins> cool
[13:14] <Laurenceb> you'll need the really small 1/8 watt 10 ohm resistors, so it gets nice and hot
[13:15] <Laurenceb> how is your code progressing?
[13:16] <Laurenceb> what are you writing it in?
[13:16] <jatkins> just the arduino language
[13:16] <Laurenceb> ah right
[13:16] <jatkins> it's like wiring
[13:16] <Laurenceb> its basically c right?
[13:16] <jatkins> yeah, pretty much
[13:17] <jatkins> I've coded the camera shutter so far and nearly finished the gps
[13:17] <jatkins> rs-232
[13:17] <jatkins> it's great because you can just use any of the digital pins
[13:19] <Laurenceb> right
[13:19] <Laurenceb> but your not putting rs232 voltages in?
[13:20] <jatkins> no
[13:20] <Laurenceb> 0 to 5V? or 0 to 2.7V ?
[13:20] <jatkins> I'm meeting up with mc soon, he know's better than me
[13:20] <Laurenceb> cool
[13:20] <Laurenceb> in person?
[13:20] <jatkins> yep
[13:20] <Laurenceb> nice, pub lunch ?
[13:20] <Laurenceb> :P
[13:21] <jatkins> I'm 13 :)
[13:21] <Laurenceb> hehe only joking
[13:21] <jatkins> lol
[13:21] <jatkins> he said to wire a gpio to pin 4 of the serial port on the gps
[13:21] <Laurenceb> I see
[13:21] <jatkins> and have the gpio set to high, giving out 5 v
[13:21] <neontube> hi
[13:21] <jatkins> hi
[13:22] <jatkins> to equal the voltage from the rs-232
[13:22] <jatkins> or something :d
[13:22] <Laurenceb> sounds ok
[13:23] <jatkins> http://www.arduino.cc/en/Reference/SoftwareSerial
[13:23] <jatkins> it's a built-in library
[13:23] <jatkins> otherwise you can only use pins 0 and 1
[13:23] <jatkins> the library lets you use any pin
[13:23] Action: Laurenceb searches for a 64bit google earth binary
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[13:49] <Hiena> Good morning!
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[17:39] <Laurenceb> hey edmoore
[17:39] <edmoore> hi lb
[17:39] <edmoore> ]s'up?
[17:39] <Laurenceb> just been shopping
[17:39] <Laurenceb> is that your new phrase?
[17:40] <Laurenceb> do you hang out on 4chan or something now ?
[17:40] <Laurenceb> anyway, I got some pink flourescent paint
[17:40] <Laurenceb> for the payload
[17:41] <Laurenceb> been working on the python script... seems to be more or less ok, but I need to do a drop test with the chute to find the drag coefficient
[17:44] <Laurenceb> have you done any experiments to find the drag coefficient?
[17:44] <edmoore> yes
[17:44] <edmoore> i dropped it
[17:45] <Laurenceb> lol, but did you record it/collect data?
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[17:53] <mc-> edmoore, did you launch yesterday?
[17:54] <edmoore> we tried to launch today
[17:54] <edmoore> but too windy
[17:54] <edmoore> this was a level 1 rocket
[17:55] <mc-> did you pick up some bits from Malcolm at R+things? I forgot to say I payed for the bits
[17:55] <mc-> I can't spell paid
[17:55] <edmoore> nope?
[17:55] <mc-> doesn't matter
[17:55] <edmoore> john wasn't there either. it was gustic like heck so no one really showed up
[17:56] <mc-> makes sense
[17:57] <mc-> I was in Camb last Thurs, but forgot to bring the stepper motors+controller
[17:57] <mc-> when does term end?
[17:57] <Laurenceb> shame :(
[17:58] <edmoore> lectures end wednesday week
[17:58] <edmoore> then i'm about for a bit
[17:58] <mc-> when do you want to go to John B?
[17:59] <mc-> with a rattworks
[18:17] <edmoore> sorry, parents called
[18:17] <edmoore> I'll send him an email
[18:17] <edmoore> Might go to his place and test it statically as he has all the kit
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[18:57] Action: jcoxon charges firefly's battery so he can boot it up and get the log file
[19:36] <Laurenceb> any luck?
[19:40] <Laurenceb> what are you using? an RC charger?
[19:43] <jcoxon> no i have the sparkfun lipo charger
[19:44] <Laurenceb> cool
[19:44] <Laurenceb> I use an rc one off ebay
[19:45] <Laurenceb> grr my cutdown code doesnt work :(
[19:47] <Laurenceb> stupid jordan curve theorem
[19:50] Action: Laurenceb realises it doesnt help to use different definitions of x and y in different functions :P
[19:50] <Laurenceb> groan... time for some food
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[19:52] <Laurenceb> ha it works :D
[19:54] Action: Laurenceb now has landing prediction, polygon cutdown and reed-solomon encoding working
[19:58] <Hiena> Seems like, everything is together for an epic fail. ;)
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[20:48] <natrium42> haha @ Hiena
[20:48] <natrium42> "You design it, You build it; We point and laugh when it doesn't work."
[20:59] <Laurenceb> eh?
[21:05] <natrium42> [14:54] * Laurenceb now has landing prediction, polygon cutdown and reed-solomon encoding working
[21:05] <natrium42> [14:58] <Hiena> Seems like, everything is together for an epic fail. ;)
[21:06] <Laurenceb> lol
[21:06] <natrium42> XD
[21:06] <Laurenceb> its much easier to test things when its linux based
[21:06] <natrium42> are you going to have some redundancy?
[21:06] <Laurenceb> hmmm
[21:06] <Laurenceb> well it has phone and radio
[21:07] <Laurenceb> and multiple supply rails
[21:07] <natrium42> good idea
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[21:07] <natrium42> are you soldering all connections or using connectors?
[21:07] <Laurenceb> much more sophisticated than things I've made before
[21:07] Action: natrium42 would solder the power connections
[21:07] <Laurenceb> there are some molex connectors, but I used gold plated
[21:08] <Laurenceb> I might solder them pre flight
[21:09] <Laurenceb> http://wiki.ukhas.org.uk/_media/projects:dscn1017.jpg?cache=cache
[21:09] <natrium42> or you could use hot glue over the connectors
[21:09] <Laurenceb> you can see the various connectors at the top
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[21:09] <natrium42> i did that with the flimsy gumstix connector on previous flight
[21:10] <Laurenceb> molex headers are pretty solid if you assemble them correctly
[21:10] <Laurenceb> hey RocketBoy
[21:10] <RocketBoy> hiya chaps
[21:10] <natrium42> well, i don't like that there's only one contact point
[21:10] <Laurenceb> RocketBoy: have you got the radio?
[21:10] <natrium42> hi RocketBoy
[21:10] <RocketBoy> yep - just got it on the bench now
[21:11] <Laurenceb> natrium42: I once had problems with molex, but that was a smashed connector that I bent into shape
[21:11] <Laurenceb> RocketBoy: cool
[21:11] <RocketBoy> sorry I have been up to my neck in other things
[21:11] <Laurenceb> powered it up yet?
[21:11] <RocketBoy> nope
[21:12] <RocketBoy> I'm just searching for your email as it happens
[21:12] <Laurenceb> make sure you've got it connected correctly :P
[21:12] <Laurenceb> ok
[21:12] <Laurenceb> red and black=obvious, 3 to 5v
[21:12] <RocketBoy> ok so thats +12v to the back wire and 0v to the red
[21:12] <Laurenceb> lol
[21:13] Action: Laurenceb searches for a photo so he can remember
[21:13] <RocketBoy> I like the groovy 50ohm track
[21:14] <Laurenceb> yes, took me a bit of working out
[21:15] <RocketBoy> does eagle not cover 50ohm then?
[21:15] <Laurenceb> I'm just looking for a mega168 pinout so I can be completely completely sure :D
[21:16] <Laurenceb> I did the calculation by hand
[21:16] <Laurenceb> then designed it accordingly
[21:16] <RocketBoy> how did you get the info on the PCB dilectric?
[21:17] <Laurenceb> google
[21:17] <Laurenceb> ok green = RX data, 0 to Vcc, 4800, 8n1
[21:18] <RocketBoy> so I can power it from 2 x 1.5v bats then?
[21:18] <Laurenceb> orange= inverted level CTS (low when RX buffer is almost full)
[21:18] <Laurenceb> should do, strickly speaking in needs >3.2V
[21:18] <Laurenceb> high when buffer almost full*
[21:19] <Laurenceb> ie orange is an OUTPUT
[21:19] <RocketBoy> ok - ill use photo lithiums
[21:20] <Laurenceb> what are you using for serial?
[21:20] <RocketBoy> I have a 3V RS232 converter (MAX 232 equivelent)
[21:21] <Laurenceb> nice
[21:21] <RocketBoy> anyone know where firefly FHALP-2 was found?
[21:22] <Laurenceb> fraid not
[21:23] <Laurenceb> RocketBoy: did you post some code on the wiki for kml --> NMEA conversion?
[21:24] <RocketBoy> yep
[21:24] <Laurenceb> cool, I might use it with the uni of wyoming code to test the aerosol project
[21:24] <Laurenceb> been running it with some simple handwritten nmea files this evening
[21:25] <Laurenceb> have you seen the latest photos?
[21:25] <Laurenceb> http://wiki.ukhas.org.uk/projects:aerosol
[21:26] <RocketBoy> its a good test harness - look out for the real time google earth output too - you can watch the progress on google earth while the NMEA is being sent to the payload
[21:26] <Laurenceb> nice :P
[21:27] <Laurenceb> if only there was a 64bit binary
[21:28] <RocketBoy> cool
[21:28] <RocketBoy> BBL - just going to wire up the TX
[21:28] <Laurenceb> :P
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[21:36] <Laurenceb> BBL
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[22:42] <Laurenceb> back
[22:42] <Laurenceb> Rocketboy: come back :(
[22:42] <kc0wys_> hey
[22:43] <Laurenceb> hello
[22:43] <Laurenceb> hmm hope the radio worked
[22:43] <kc0wys_> i havent been on here for a while...
[22:43] <kc0wys_> only just heared about the recent flight
[22:43] <kc0wys_> what happened?
[22:43] <Laurenceb> there should be another in a couple of weeks
[22:44] <Laurenceb> ask jcoxon :P
[22:44] <kc0wys_> ok
[22:45] <jcoxon> hey kc0wys_
[22:45] <jcoxon> yeah we launched, lost contact but its been recovered
[22:47] <Laurenceb> have you got the logfile off yet?
[22:48] <kc0wys_> o hey
[22:49] <kc0wys_> nice, was it based around a gumstix or different hardware?
[22:50] <jcoxon> it was based on the Telit GM862 module
[22:50] <Laurenceb> were you logging to flash?
[22:50] <jcoxon> www.pegasushabproject.org.uk/wiki/doku.php/missions:firefly:fhalp-2
[22:50] <jcoxon> Laurenceb, yeah
[22:51] <kc0wys_> i'll check it out sometime, swamped with work atm
[22:51] <kc0wys_> :(
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[23:17] <jcoxon> hey edmoore
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[23:30] <jcoxon> got all the log now
[23:30] <Laurenceb> sweet
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[23:33] <jcoxon> hmmmmm
[23:33] <jcoxon> its very interesting
[23:33] <jcoxon> the payload actually didn't go that high
[23:33] <Laurenceb> yes, thats what it looked like
[23:34] <jcoxon> but the cutdown fired
[23:35] <Laurenceb> right, was it logging on the way down
[23:35] <jcoxon> it logged for the next 12 hours!
[23:35] <Laurenceb> wow :P
[23:36] <Laurenceb> that 2000mah cells for you
[23:37] <Laurenceb> the AOPP project should last about that long
[23:37] <jcoxon> cool
[23:37] <jcoxon> so max alt was 11399.7m
[23:37] <Laurenceb> :( pity it wasnt higher
[23:37] <jcoxon> yeah
[23:38] <jcoxon> that cutdown defintly went bang
[23:38] <Laurenceb> odd that the radio failed
[23:38] <jcoxon> i think i've found why
[23:39] <Laurenceb> ?
[23:39] <jcoxon> the ground plane wires are intact but the antenna wire has come off
[23:39] <Laurenceb> lol how come?
[23:39] <jcoxon> not sure
[23:40] <Laurenceb> soldered?
[23:40] <jcoxon> it was soldered and heat shrinked
[23:40] <Laurenceb> right, leadfree?
[23:40] <jcoxon> perhaps it got tangled and ripped off (the camera was hanging below it
[23:40] <jcoxon> yeah
[23:40] <Laurenceb> leadfree can go quite brittle at those temperatures
[23:41] <jcoxon> yeah
[23:41] Action: Laurenceb has leaded
[23:46] <jcoxon> http://www.pegasushabproject.org.uk/wiki/doku.php/missions:firefly:fhalp-2:flightlog
[23:50] <jcoxon> right, night Laurenceb
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[00:00] --- Mon Mar 3 2008