highaltitude.log.20080110

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[00:29] <laurence> hi again all
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[08:31] <neontube> morning all
[09:02] <neontube> ping pong
[10:09] <neontube> wakey wakey rise and shine
[10:24] <Laurenceb> hello
[10:44] <neontube> hi
[10:44] <neontube> how r u
[10:47] <Laurenceb> working
[10:47] <Laurenceb> I've got a pressure sensor talking to an avr
[10:47] <Laurenceb> I've been trying to develop under linux
[10:47] <neontube> ooo nice
[10:47] <Laurenceb> avr-gcc isnt as nice under linux imo
[10:48] <Laurenceb> but there are some nice editors
[10:48] <neontube> not done any avr-gcc at all so....
[10:48] <Laurenceb> I need to find a makefile generator
[10:48] <Laurenceb> I've been trying to get flash and java to work
[10:48] <Laurenceb> but no luck, as its an amd64 system
[10:48] <Laurenceb> not sure if its even possible
[10:49] <neontube> :s
[10:50] <Laurenceb> its all designed for 32 bit systems, at least when it comes to linux
[10:50] <neontube> i'm looking at a list of fax data that is sent via shortwave
[10:50] <Laurenceb> and its closed source, so you can build it yourself
[10:51] <Laurenceb> I compiled all the avr tools from source :D
[10:51] <neontube> yer i have got a copy of suse 9 (i think)
[10:51] <neontube> and that came with a amd 64 bit version
[10:51] <Laurenceb> I'm going to look into linux RTTY
[10:52] <neontube> cool
[10:55] <neontube> managed to meet up with jimboc yesterday
[10:56] <Laurenceb> who?
[10:56] <Laurenceb> jcoxon?
[10:56] <neontube> yer :-P
[10:56] <Laurenceb> cool, get up to much?
[10:56] <neontube> nar, i didn't have much time, just nipped out the confrence thing i was at to give him one of the weather sat boxes i had kicking around
[11:29] <neontube> boards turned up yet ?
[12:19] <Laurenceb> no, not expecting them for a couple of days yet
[12:19] <Laurenceb> just been giving a presentation to the aerosol research group
[12:20] <Laurenceb> no we're going for a pub lunch :P
[12:21] <Laurenceb> now8
[12:21] <Laurenceb> bbl
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[12:30] <neontube_> sounds fun, what was presentation about
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[14:48] <Laurenceb> hi ed
[16:22] <Professor> g'morning all
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[16:37] <Professor> sup dude
[16:37] <jcoxon> hey Professor
[16:48] <Laurenceb> hey jcoxon
[16:48] <Laurenceb> did you post off the gps?
[16:49] <jcoxon> oh, sorry
[16:49] <jcoxon> no its sitting on my desk
[16:49] <jcoxon> tis an exam week so i've been a little distracted
[16:49] <jcoxon> will get it off asap
[17:15] <Laurenceb> thanx
[17:15] <Laurenceb> I'm trying to get typecasting to work
[17:16] <Laurenceb> myfloat=(float) myint;
[17:16] <Laurenceb> doesnt work
[17:16] <Laurenceb> printf gives me "?"
[17:21] <Laurenceb> just got my 5Kv power supply running
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[18:06] <Laurenceb> jcoxon: you about?
[18:08] <jcoxon> yup
[18:08] <Laurenceb> any good at c?
[18:09] <Laurenceb> myfloat=(float) myint; whats wrong with that?
[18:09] <jcoxon> i'm not great with c
[18:10] <jcoxon> what are you trying to achieve?
[18:10] <Laurenceb> turn an int into a float
[18:12] <Laurenceb> maybe its a problem with heap/stack collision
[18:12] <Laurenceb> I'll talk to some guys here about it...
[18:13] <Laurenceb> I need to do more work, spent all afternoon in the pub with the aerosol research group
[18:16] <jcoxon> haha
[18:18] <Laurenceb> they are obsessed with IDL and fortran
[18:18] <Laurenceb> but their world was in termoil as nobody had the right fortran compiler
[18:19] <Laurenceb> I suggested GCC but apparently thats not kosher
[18:19] <jcoxon> bless gcc
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[18:31] <Laurenceb> hey natrium42
[18:32] <Laurenceb> maybe you can help
[18:32] <natrium42> hi
[18:32] <Laurenceb> myfloat=(float) myint; whats wrong with that?
[18:32] <Laurenceb> when I try to printf myfloat I get "?"
[18:32] <natrium42> why? looks correct
[18:32] <Laurenceb> hmm
[18:32] <natrium42> what's your printf?
[18:32] <Laurenceb> maybe a heap stack collision?
[18:32] <Laurenceb> stdio.h
[18:33] <Laurenceb> and stdlib.h are included
[18:33] <natrium42> just paste your printf code
[18:34] <Laurenceb> its just the normal put_char get_char stuff
[18:35] <Laurenceb> works fine everywhere
[18:36] <Laurenceb> then I'm using the normal printf function
[18:37] <Laurenceb> could it be I'm using too much ram?
[18:40] <Laurenceb> I'll try and reduce ram use
[18:41] <jcoxon> Laurenceb, what are you using to compile?
[18:41] <jcoxon> gcc?
[18:41] <Laurenceb> yes
[18:41] <jcoxon> are you including any libs?
[18:41] <natrium42> Laurenceb, i can't tell you anything without seeing the relevant code...
[18:42] <Laurenceb> its on my other machine sorry
[18:42] <natrium42> okay, i see
[18:42] <Laurenceb> sum=(long int) a2dconvert10bit(5);
[18:43] <Laurenceb> sumfloat=(float)sum
[18:43] <Laurenceb> printf("%f\r\n",sumfloat);
[18:43] <Laurenceb> is basically my code
[18:44] <Laurenceb> if I printf sum, its correct
[18:44] <Laurenceb> but the sumfloat printf is not
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[18:46] <Laurenceb> how do I distinguish between float and double?
[18:46] <Laurenceb> %f is for double right?
[18:46] <Laurenceb> hey Rocketboy
[18:46] <RocketBoy> hi ya
[18:47] <natrium42> Laurenceb, try adding -lprintf_flt to the CC options
[18:47] <RocketBoy> %lf & %f
[18:47] <natrium42> err, LIBS= line
[18:47] <RocketBoy> long float = double
[18:48] <RocketBoy> depends if you are scanf ing of printf ing
[18:48] <Laurenceb> natrium42: already done
[18:48] <Laurenceb> printf
[18:48] <natrium42> did you try using a literal constant?
[18:48] <neontube> oh how i had forgotten all about c programming
[18:48] <Laurenceb> but I think its integer to float conversion thats going wrong
[18:48] <natrium42> printf("%f\r\n",1.2345);
[18:48] <RocketBoy> then its double by default I think
[18:48] <Laurenceb> yes, i'm getting a warning from gcc
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[18:49] <RocketBoy> float will be automatically promoted
[18:49] <Laurenceb> "expects double"
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[18:49] <Laurenceb> ok
[18:49] <Laurenceb> sum=sum/100.0;
[18:49] <RocketBoy> jut convert by casting to double as in (double)
[18:49] <Laurenceb> is that ok, if sum is a float?
[18:50] <RocketBoy> put the sum in brackets and cast - as in (double)(a + b)
[18:50] <Laurenceb> sum is a float
[18:51] <RocketBoy> oh ok the (double)sum
[18:51] <Laurenceb> ie x=x/100.0;
[18:51] <Laurenceb> will that work?
[18:52] <RocketBoy> yep or x /= 100.0
[18:53] <Laurenceb> ok thanx
[18:53] <Laurenceb> better yet some food
[18:53] <Laurenceb> cya all
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[18:55] <jcoxon> evening RocketBoy
[18:56] <RocketBoy> hiya
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[18:57] <jcoxon> i've signed to foundation licence course/exam
[18:57] <jcoxon> signed up to*
[18:58] <RocketBoy> excellent - whens the exam?
[18:58] <jcoxon> not sure yet,
[18:58] <jcoxon> they haven't decided when the course is, though in the next couple of months
[18:59] <jcoxon> i did an online mock test and passed :-)
[18:59] <RocketBoy> they used to be january/feb when I took it
[18:59] <RocketBoy> spot on whats the url?
[18:59] <jcoxon> i think they can now do the exam straight after the course
[19:00] <jcoxon> www.hamtests.co.uk
[19:00] <RocketBoy> i'll give it a go
[19:00] <jcoxon> i've also found an yaseu ft-790r on ebay
[19:01] <jcoxon> i only did hte 10 min test
[19:01] <RocketBoy> oh yeah you asked a Q - £90 to £150 depending on condition
[19:01] <jcoxon> the real one is 25mins
[19:01] <jcoxon> okay
[19:01] <jcoxon> its at 102
[19:02] <jcoxon> but still has 3 days
[19:03] <jcoxon> i have a feeling you'll pass the foundation test :-)
[19:06] <RocketBoy> seems I have to register 1st so CBA
[19:07] <jcoxon> yeah you do
[19:09] <RocketBoy> the ft790 seems in reasonable nick externally
[19:09] <RocketBoy> (i found it)
[19:09] <jcoxon> well its the only one on ebay right now
[19:10] <natrium42> jcoxon, so you get a cool callsign too then?
[19:10] <jcoxon> eventually
[19:10] <jcoxon> yup
[19:10] <jcoxon> got to actually do the course and pass the exam
[19:10] <natrium42> JXCONR1
[19:10] <natrium42> i guess you can't choose, right?
[19:11] <RocketBoy> you used to be able to wait for the one you wanted to come round
[19:11] <jcoxon> RocketBoy, apparently if you send in your pass you can request a call sign
[19:12] <jcoxon> and as long as no one else has it you can have it
[19:12] <RocketBoy> my mate bernard got G4BJA which where his initials
[19:12] <jcoxon> natrium42, mine will start with M3 i think
[19:12] <jcoxon> due to the level of the licence
[19:12] <natrium42> ah
[19:13] <RocketBoy> I had two callsignes G6AMF and G8KHW (which I still hold)
[19:13] <RocketBoy> in those days ham TV was licenced seperatly - that was what G6AMF was for
[19:16] <RocketBoy> jcoxon - what about http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&rd=1&item=250202632692&ssPageName=STRK:MEWA:IT&ih=015
[19:16] <RocketBoy> its SiRF IIe/LP
[19:17] <jcoxon> looks good
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[19:17] <jcoxon> did you bid on the other one?
[19:18] <RocketBoy> nah not yet - i'm a last minute man
[19:18] <jcoxon> okay
[19:19] <jcoxon> its funny the way we are looking for older technology
[19:19] <RocketBoy> yep - old is sometime better
[19:19] <natrium42> you should use commodore 64 to control the payload :)
[19:20] <RocketBoy> I was thinking of a ZX81 as being suitable the other day
[19:21] <jcoxon> we should build a victorian tech based payload
[19:21] <RocketBoy> clockwork
[19:21] <jcoxon> yeah
[19:21] <natrium42> haha
[19:21] <RocketBoy> thats what van allen used
[19:21] <natrium42> would be awesome
[19:21] <natrium42> bbl, lecture
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[19:22] <RocketBoy> http://cgi.ebay.co.uk/Sinclair-ZX81-Computer-Great-Condition_W0QQitemZ220189318818QQihZ012QQcategoryZ11994QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
[19:22] <jcoxon> use something like the sun to locate the payload
[19:22] <jcoxon> RocketBoy, before my time :-p
[19:23] <RocketBoy> yeah - they are probably older than u
[19:23] <RocketBoy> they would have been good though - just strip the case off - 8V I think
[19:24] <jcoxon> RocketBoy, in all seriousness, clockwork
[19:24] <jcoxon> tap out morsecode
[19:24] <jcoxon> old school camera to take pictures
[19:24] <RocketBoy> well it could be done
[19:25] <jcoxon> have to track the radio itself
[19:25] <jcoxon> not sure how to replace GPS
[19:25] <jcoxon> though i guess we should really get modern technology to properly work first
[19:25] <RocketBoy> yep
[19:26] <RocketBoy> ah well - better go and test HARVe
[19:26] <RocketBoy> bbl
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[20:15] <msweeney> evening
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[20:25] <msweeney> anyone around to advise on batteries for running Arduino + GM862 gps unit?
[20:44] <edmoore> anything would, I would have thought
[20:44] <edmoore> either the energizer lithiums in the AA packages (or AAA)
[20:45] <edmoore> or something rechargeable which can deal with low temps
[20:45] <edmoore> energizer lithiums are very very very good, but pricey
[20:46] <RocketBoy> they seem to have come down a lot recently they were 4 for 3.95 in tescos the other day
[20:47] <edmoore> rocketboy, further to your earlier convo about using vicorian tech, the scout rockets made orbit many times using a paper tape control system
[20:47] <edmoore> kind of humbling
[20:49] <RocketBoy> yep - the russians were king of that type of thing
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[20:50] <jcoxon> hey msweeney
[20:50] <RocketBoy> mind the 1st computer I used used paper tape
[20:50] <msweeney> hey
[20:50] <msweeney> brb
[20:50] <RocketBoy> and also punched cards
[20:50] <jcoxon> go for a lipo cell for the gm862
[20:50] <edmoore> debugging must have been fun
[20:50] <RocketBoy> yeah - you would write the program on punched tape and send it off
[20:51] <RocketBoy> next day it would come back with somthing like
[20:51] <RocketBoy> syntax error on line 7
[20:51] <RocketBoy> and you would have to fix it and send it off again
[20:52] <edmoore> There's a fun book in the room we have supervisions from an old supervisor and fellow who taught my current director of studies. It's called 'Signal Processing algorithms for the Digital Computer'
[20:52] <RocketBoy> it made you think very carefully about what you were writing
[20:52] <edmoore> and if you look at the date it was published and do some research, you see that he really really means *the* digital computer
[20:52] <RocketBoy> must have been leading edege
[20:53] <RocketBoy> on one of the 1st computers I used you had to load the papaer tape reading program in on switches on the front
[20:53] <RocketBoy> pdp8 I think
[20:54] <jcoxon> the first computer i have was an ibm ps2
[20:54] <RocketBoy> http://en.wikipedia.org/wiki/PDP-8
[20:54] <RocketBoy> luxury
[20:54] <edmoore> already there :)
[20:55] <RocketBoy> see that row of switches on the bottom
[20:55] <RocketBoy> well you set up the instruction code on them and pushes a button to load it
[20:55] <edmoore> as it happens our first microcontroller lab here had us entering instructions into a 6800 with switches. it was actually about the most valuable thing I think I've ever done
[20:55] <RocketBoy> micbug?
[20:56] <edmoore> I spent 2 hours designing the code on paper for a pwm shower heater
[20:56] <edmoore> i don't know - I think it was motorola so i guess it could have been
[20:57] <edmoore> but the datasheet (which I just found) is 20 pages
[20:58] <edmoore> marvellous :)
[20:58] <edmoore> the programmers module is a diagram of a few registers, and fits on one pag
[20:58] <edmoore> page*
[21:04] <RocketBoy> http://www.7dayshop.com/catalog/product_info.php?cPath=777_3&products_id=5345
[21:04] <edmoore> oh my god!
[21:04] <edmoore> stocking up time!
[21:05] <RocketBoy> tescos online seemed much higher than in the shop - perhaps they were on the wrong peg
[21:09] <RocketBoy> I'll take a deco tomorrow
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[00:00] --- Fri Jan 11 2008