highaltitude.log.20080112

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[00:27] <Laurenceb> hi all
[00:27] Action: Laurenceb has been to maplins
[00:28] <Laurenceb> they actually sell something useful, a 3v rs232 ic
[00:28] <Laurenceb> is it worth paying £30 for a very good multimeter?
[00:30] <Laurenceb> they have a very small autoranging one with a backlight, memory settings and various other stuff for that
[00:30] <edmoore> do you need it?
[00:30] <Laurenceb> probably not :P
[00:30] <Laurenceb> its just very dinky
[00:31] <edmoore> if (need) then buy() else walkaway()
[00:31] <Laurenceb> I might look on ebay
[00:31] <Laurenceb> lol
[00:31] <Laurenceb> that was annoying losing a load of work :(
[00:31] <Laurenceb> have to remember to sync
[00:31] <edmoore> yeah I can imagine
[00:32] <Laurenceb> I've rewritten all the files now
[00:32] <Laurenceb> it was all the c code for the slave avr on the particle hab
[00:32] <Laurenceb> the linux boards will probably use python
[00:33] <Laurenceb> board*
[00:34] <Laurenceb> the guys at the departments have been converted to linux boards and ordered a load
[00:35] <Laurenceb> is there a python eqivalent to system() in c?
[00:39] <Laurenceb> I've just got wobbly windows working :D ha more bling than mac
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[11:02] Action: jcoxon has just got back from B & Q with some piping to make his QFH antenna
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[11:57] <neontube> hey all
[11:58] <neontube> what cable have u got for the antenna
[12:00] <jcoxon> neontube, haven't got that yet
[12:00] <neontube> fair enough
[12:00] <neontube> u got te unit powered up etc yet ?
[12:01] <jcoxon> yeah
[12:01] <jcoxon> i'm going to use RG58 cable
[12:01] <jcoxon> from maplins
[12:01] <jcoxon> neontube, i've rewired the power socket, it now makes a noise :-)
[12:01] <jcoxon> but its just noise
[12:02] <neontube> lol
[12:02] <jcoxon> going to maplins this afternoon
[12:02] <neontube> for some reason that box had a different power socket to te others
[12:02] <jcoxon> yeah it was weird but i just opened the box and soldered on a new one
[12:02] <neontube> the 'frame store' out is basicaly an old tape recorder din out
[12:02] <jcoxon> so i just need to get a din plug
[12:04] <jcoxon> and wire that to a 3 1/2 " jack?
[12:04] <neontube> yer, or solder in a jack
[12:04] <neontube> yer thats what i id
[12:04] <neontube> did
[12:04] <neontube> i should solder it rather than tiwst wire it
[12:04] <neontube> might get less noise tehn
[12:05] <jcoxon> http://www.maplin.co.uk/Module.aspx?ModuleNo=1095&C=GKW&Criteria=DIN%20JACK&U=DIN%20JACK&T=2002134&gclid=CIjNs_jT8JACFQqwQwodT2ik0w
[12:06] <neontube> should do it
[12:06] <neontube> but i would get one u can solder just in case its not the correct wireing
[12:06] <jcoxon> yup
[12:06] <neontube> i just did trial and error to find the pin with the noise on it
[12:07] <neontube> right off out shopping tme
[12:07] <jcoxon> cool
[12:07] <jcoxon> oh have you got an image yet?
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[17:18] <edmoore> hi everyone
[17:18] <edmoore> neontube, how was BETT?
[17:30] <neontube> bett was ok
[17:30] <neontube> will be back for a chat later, wife has got me cleaning the kitchen
[17:30] <edmoore> lol
[17:30] <edmoore> ok
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[17:48] <edmoore> hi jcoxon
[17:48] <edmoore> quick question - do you have any experience with qnx?
[17:53] <jcoxon> hey edmoore
[17:53] <jcoxon> sadly no
[17:53] <jcoxon> pour quoi?
[17:53] <edmoore> well it's designed for real time embedded control, and it's *nixy
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[17:54] <jcoxon> indeed
[17:54] <edmoore> and I know an awful lot of industrial embedded stuff runs off it
[17:54] <jcoxon> if its *nixy
[17:54] <jcoxon> it shouldn't be too difficult
[17:54] <edmoore> I was just wondering if you knew about it's use at the lower end
[17:54] <jcoxon> stick it in an emulater and have a play
[17:54] <jcoxon> qemu i'm sure will work
[17:54] <edmoore> ok cool, will have a play
[18:04] Nick change: malgar2 -> malgar
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[19:47] <Laurenceb_> hey all
[19:48] <Laurenceb_> hows it going?
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[20:33] <Laurenceb> hi all
[20:33] <Laurenceb> anyone used octave?
[20:35] <Laurenceb> I cant get it to run a simple "hello world" script :(
[20:36] <Laurenceb> its in the search path
[20:36] <Laurenceb> "too few arguments"
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[20:50] <fnoble> hey
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[21:03] <neontube> ello all
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[21:19] <jcoxon> hey all
[21:20] <Laurenceb> hey jcoxon
[21:21] <Laurenceb> fnoble: have you used octave?
[21:21] <fnoble> no, not tried it yet
[21:21] <fnoble> i think ed has, he was telling me about it
[21:22] <Laurenceb> my simple hello world code wont work
[21:22] <fnoble> its supposed to be compatible with matlab almost entirely isnt it?
[21:22] <Laurenceb> yes
[21:23] <fnoble> does it work in interactive mode
[21:23] <fnoble> ?
[21:23] <Laurenceb> think so
[21:23] <Laurenceb> if I save log.m in the search path
[21:23] <Laurenceb> then enter log
[21:24] <Laurenceb> error: log: too few arguments
[21:24] <fnoble> maybe its cos log is a keyword
[21:24] <fnoble> tried using a different file name?
[21:24] <Laurenceb> ah
[21:24] <Laurenceb> will do
[21:26] <fnoble> how do you work out limits where you are subtracting one inf quantity from another?
[21:26] <fnoble> mathematica says the answer is 1/2 but it dont know why
[21:26] <Laurenceb> differentiate?
[21:27] <Laurenceb> so examine differential as variable --> infinity
[21:27] <Laurenceb> try with a calculator and very large numbers :P
[21:27] <fnoble> 1/(1 - \e^-x) - (x e^-x)/(1 - \
[21:27] <fnoble> e^-x)^2
[21:27] <fnoble> is the function
[21:28] <Laurenceb> hmmm, there are "proper" ways to do it
[21:28] <fnoble> if you use l'hopital on the first bit, the 1 differentiates to 0
[21:28] <fnoble> so it doesnt help you
[21:28] <Laurenceb> I cant remember any others sorry
[21:28] <fnoble> i think :)
[21:28] <Laurenceb> have a search online/in books
[21:29] <Laurenceb> theres no "way to do this"
[21:29] <Laurenceb> but there are quite a few techniques that help
[21:29] <fnoble> yeah, i didnt know if there was a common technique for this type of problem
[21:31] <Laurenceb> it works :D
[21:31] <Laurenceb> thanx
[21:33] <jcoxon> aaarrgghhhh
[21:34] <jcoxon> this antenna is tough to make
[21:34] <jcoxon> i've already made a mistake
[21:44] <Laurenceb> lpr: Error - no default destination available.
[21:44] <Laurenceb> whats that about?
[21:49] <jcoxon> lpr?
[21:49] <jcoxon> what program? what os?
[21:49] <Laurenceb> its from octave
[21:49] <jcoxon> oh right
[21:49] <Laurenceb> running on ubuntu
[21:49] <jcoxon> i'll be quiet then
[21:50] <jcoxon> lpr is sometimes a printer driver
[21:50] <Laurenceb> yes
[22:04] <Laurenceb> ah I seem to have screwed up octave somehow
[22:05] <Laurenceb> restarting it and it works :D
[22:07] <Laurenceb> bbl
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[22:49] <Laurenceb> hi again guys
[22:50] <Laurenceb> jcoxon: what are you trying to do with antenna?
[22:54] <Laurenceb> make a 433MHz ant ?
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[22:55] <Laurenceb> hey mc-
[22:55] <mc-> hey lb
[22:57] <mc-> I see zeusbot is alive, where's it logging to?
[22:57] <mc-> playing with stepper motors at the moment
[23:00] <Laurenceb> check the topic
[23:01] <mc-> aha, thanks
[23:01] <Laurenceb> I'm playing with octave, you any good with it/
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[23:02] <mc-> I've forgotten matlab now
[23:03] <mc-> what you doing?
[23:06] <Laurenceb> I'm writing something fairly basic to help debug avr control systems
[23:06] <mc-> makes sense, you can do a lot in octave/matlab
[23:08] <Laurenceb> yes, i'll use gnuplot to plot data
[23:08] <mc-> I once did a frequency plot for a digital filter, the filter didn't use any multiplies
[23:08] <mc-> just shift and adds, so it was really fast
[23:11] <mc-> cya
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[23:55] <jcoxon> antenna complete :-D
[00:00] --- Sun Jan 13 2008