highaltitude.log.20091025

[00:05] <jiffe99> well tested the parachute I got from spherachutes, seemed like the descent might have been a bit fast but it landed ok
[00:05] <jiffe99> I like those chutes, they seem pretty well designed
[00:05] <SpeedEvil> http://www.dansdata.com/goop.htm - :)
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[00:15] <jiffe99> so there parachutes don't really have a good way to attach to the top, common to make an attachment or let them hang?
[00:15] <jiffe99> these parachutes even
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[00:22] <Laurenceb> "since the whole concept of Vegemite as thermal goop is inherently grounds for committal to a special place where the staff are very calm and the dinner forks have corks on them, I don't think corrosion problems are the single factor that rules it out."
[00:22] <Laurenceb> lmao
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[00:40] <edmoore> jiffe99: we prefer to add an attachment so the parachute is in-line
[00:40] <edmoore> it seems a bit more reliable that way
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[09:41] <jcoxon> hey all
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[09:43] <rjharrison> Hey jasonb
[09:43] <rjharrison> Opps
[09:43] <rjharrison> Jco
[09:43] <MikeMc> morning all
[09:43] <rjharrison> Morning MikeMc
[09:43] <rjharrison> SpikeUK you callewd yesterday
[09:44] <SpikeUK> rjharrison Morning! Just to say hello and ask how's it going!
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[09:55] <rjharrison> SpikeUK Well I'm ready for launch
[09:55] <rjharrison> Are you interested in attending the launch?
[09:55] <rjharrison> You could bring the camera and take some pictures
[09:56] <rjharrison> Even come along for the chase would make the talks a bit more first hand :)
[09:58] <SpikeUK> Oh. When?
[09:58] <rjharrison> Not sure atm
[09:58] <SpikeUK> Today?
[09:58] <rjharrison> Weather is not good but as soon as it chnages to be good
[09:58] <rjharrison> SpikeUK no :(
[09:58] <rjharrison> It's bad this weekend may be getting better towards next
[09:59] <rjharrison> Anyhow if you want I'll give you as much notice as I can and you would be welcome to attend
[09:59] <rjharrison> Not sure where abouts in the country you are
[10:00] <SpikeUK> I'm in surrey, but can get to CAMB without any trouble
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[10:23] <jcoxon> wow airport cards in old apple laptops are cpu hogs
[10:24] <MikeMc> i'd like to attend if possible if it's a weekend launch
[10:24] <MikeMc> would be good to see a launch so i have an idea what goes on for my own
[10:27] <jcoxon> morning MikeMc
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[11:35] Action: jcoxon has started work on his cnc hot cutter
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[11:38] Action: SpeedEvil imagines CNC cut chocolate.
[11:38] <jcoxon> taken apart an old lexmark printer scanner
[11:38] <jcoxon> gives me 2 stepper motors and drive belts etc
[11:38] Action: SpeedEvil looks at his barrel of steppers.
[11:39] <jcoxon> and just found the data sheet for the chip that controls the motors
[11:39] <SpeedEvil> :)
[11:39] <jcoxon> mmmmm pwm control...
[11:39] <SpeedEvil> Older stuff is good that way
[11:39] <jcoxon> A3966SLB
[11:39] <SpeedEvil> I was just looking at a possibple project - a miniature RF modulator for the n900 phone to make it a wireless TV transmitter
[11:40] <SpeedEvil> But the first 10 modulator chips I found that'd be _ideal_ - all are EOL'd
[11:40] <SpeedEvil> As for obvious reasons, UHF TV modulator demand had declined somewhat
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[11:43] <jcoxon> SpeedEvil, where is the best place to search for datasheets or do you just use google?
[11:45] <SpeedEvil> google, pretty much.
[11:45] <SpeedEvil> I have some search engines setup
[11:45] <SpeedEvil> so I do d ne555
[11:45] <SpeedEvil> first - in the address bar to see if digikey has it
[11:46] <SpeedEvil> then maybe another couple of sites - or hit up the vendors site.
[11:46] <SpeedEvil> Then google, which usually leads to a datasheet site of some form that may not have it.
[11:47] <SpeedEvil> searching eetimes and stuff can be useful for keywords
[11:47] <jcoxon> struggling to find anything for this chip
[11:47] <jcoxon> realtek rts8852b-01
[11:48] <SpeedEvil> chop off the b-01 - and search for that
[11:50] <SpeedEvil> But I can't seem to find anything. I can find where you can buy them :)
[11:50] <jcoxon> same
[11:50] <SpeedEvil> what's it/
[11:50] <jcoxon> so this is a lexmark printer/scanner
[11:50] <jcoxon> i've identified one stepper motor controller
[11:50] <jcoxon> but trying to see if i can find the other
[11:51] <SpeedEvil> ah - right
[11:51] <SpeedEvil> does it have ethernet?
[11:51] <jcoxon> no
[11:51] <jcoxon> usb
[11:51] <jcoxon> ethernet cause its realtek?
[11:51] <SpeedEvil> yes, I was wondering
[11:51] <SpeedEvil> that'd be an easy solution
[11:52] <jcoxon> seems to be a known scanner chipset
[11:52] <jcoxon> wondering whether i could use SANE to control the motor
[11:54] <edmoore> that would be insane
[11:54] <edmoore> I'll get my coat.
[11:55] <jcoxon> hehe
[11:59] <jcoxon> SpeedEvil, i suspect that the rts8852 is a fully integrated chip
[12:00] <jcoxon> and does everything including controlling the motor
[12:03] <SpeedEvil> Iprobably
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[12:10] <jcoxon> SpeedEvil, http://www.flickr.com/photos/jcoxon77/sets/72157622657803326/
[12:13] <edmoore> jcoxon: probs can't make the thing tonight now, tess is coming up
[12:18] <jcoxon> oh okay
[12:18] <jcoxon> well i'll write minutes
[12:21] <edmoore> thanks. a bit annoying, but such is life
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[12:38] <MikeMc> jcoxon: Hi
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[12:39] <jcoxon> hey MikeMc
[12:40] <MikeMc> hey
[12:44] <edmoore> bbl lunch time
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[13:01] <SpeedEvil> http://bellard.org/tcc/tccboot.html ... insane
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[13:20] <Laurenceb> hi
[13:20] <Laurenceb> http://yro.slashdot.org/comments.pl?sid=1416293&cid=29852573 <- lol
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[13:35] <SpeedEvil> http://bellard.org/tcc/tccboot.html ... insane
[13:35] <SpeedEvil> yeah - saw that
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[16:02] <Laurenceb> http://www.newscientist.com/article/dn17963-virgin-galactic-adds-satellite-launches-to-space-tourism.html
[16:02] <Laurenceb> interesting
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[17:25] <rjharrison> Hi all
[17:27] <rjharrison> Just going to have a quicak bath
[17:27] <rjharrison> been laying bricks all day today
[17:29] <SpeedEvil> :)
[17:29] Action: SpeedEvil has been moving galvanised iron.
[17:29] <Laurenceb> http://www.youtube.com/watch?v=4qVuVix5kCE
[17:29] Action: Laurenceb has been on youtube
[17:31] <Laurenceb> they have got to be joking surely
[17:32] <SpeedEvil> umm
[17:32] <SpeedEvil> lol
[17:33] <SpeedEvil> It is a complely sane solution - given a supply of scrith wire.
[17:34] <SpeedEvil> I think you can also do it with rods out the side far enough - and a couple of wires
[17:35] <SpeedEvil> but - that does hideous things to the control and drag
[17:35] <SpeedEvil> Also the control laws on the first stage are going to be fucking scary
[17:36] <Laurenceb> basically that will attempt to steer it out of changes in velocity
[17:36] <Laurenceb> so if you are accelerating to either side it will try and steer back
[17:37] <Laurenceb> but any assymmetery in engine pointing and it will fly in an arc
[17:37] <Laurenceb> also wires burn through
[17:37] <Laurenceb> also how do you point it accurately for launch
[17:38] <Laurenceb> also it will have a ton of sunstable oscillatory modes
[17:38] <SpeedEvil> I think that's irrelevant - the control law issues can be solved.
[17:39] <SpeedEvil> They are hideous, but not insoluble.
[17:39] <SpeedEvil> But what the hell do you make the wires from.
[17:39] <SpeedEvil> And at that point a rational person gives up and stacks the stages.
[17:43] <Laurenceb> I vote for the two stage balloon launched micro spun rocket :P
[17:43] <Laurenceb> obviously
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[17:49] <Laurenceb> I did think it wasnt scalable but actually maybe it does get better as you increase the size
[17:49] <Laurenceb> it doesnt have to spin nearly as fast
[17:51] <Laurenceb> but it is going to spend longer in the atmosphere and suffer from anagle of attack more
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[17:53] <SpeedEvil> why ?
[17:53] <SpeedEvil> oh - regression rate barring complex geometries
[17:54] <Laurenceb> angle of attack at max Q is less than one degree with the n-prize scale launcher
[17:56] <jcoxon> SpeedEvil, got the first stepper motor working
[17:56] <jcoxon> so thats x
[17:56] <jcoxon> now onto y
[18:00] <SpeedEvil> :)
[18:01] <jcoxon> still haven't worked out how the board controls the 2nd stepper
[18:03] <jcoxon> SpeedEvil, could 3 2n700 mosfets do the job?
[18:04] <jcoxon> just identifying whats on the pcb board
[18:05] <SpeedEvil> you sure it's a stepper?
[18:05] <jcoxon> yup
[18:05] <jcoxon> mitsumi m42sp-6te stepper motor
[18:05] <SpeedEvil> what voltage?
[18:06] <SpeedEvil> and sure it's 3 not 4?
[18:06] <SpeedEvil> how many wires - 4 or 6?
[18:06] <jcoxon> 4 wires
[18:10] <jcoxon> and i can't find the 4th 2n700
[18:10] <jcoxon> (with 4 i guess you could make a dual hbridge
[18:11] <Laurenceb> http://www.smallbizcenter.info/magniwork.php?apid=A33M&apflag=1&v=1
[18:12] <SpeedEvil> oh dear.
[18:13] <Laurenceb> epic lulz
[18:16] <natrium42> "We finally succeeded in creating a web site which offers the Do-It-Yourself instructions for building such a device, and it is considered that this device will be able to solve the energy crisis."
[18:16] <natrium42> this sentence has so much fail.
[18:19] <Hiena> Ehehehehe...
[18:21] <Hiena> Such generators remembers me the classic levitateing magnet motor.
[18:21] <Laurenceb> dean drive?
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[18:23] <Hiena> Nope. Simple magnets placed to the base and a spinner placed same polarity magnets on the top of it.
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[18:24] <Hiena> The spinner's magnest interconnected with a coils into a short circuit.
[18:25] <Hiena> Due the magnets same polarity the spinner levitate over the base, and due the Lentz-law even the smallest disturbances start a current in the shorted coils.
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[18:37] <jcoxon> hmmm i suspect i'm going to have to control this stepper myself
[18:37] <jcoxon> rather than tapping something else
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[18:48] <jcoxon> ping Laurenceb
[18:48] <Laurenceb> yo
[18:52] <Laurenceb> http://www.woodwardeffect.org/ <- what the ...
[18:52] Action: Laurenceb doesnt know what to say
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[20:49] <Laurenceb> http://theflatearthsociety.org/forum/
[20:52] <Laurenceb> The Flat Earth Society also maintains that the Earth is accelerating upward at a rate of 9.8 m/s², thereby simulating gravity,[12] under the influence of a form of dark energy
[20:52] <natrium42> http://i.imgur.com/9nCeW.jpg
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[21:01] <gordonjcp> how long would it take to reach the speed of light, accelerating at 9.8m/s/s?
[21:02] <Randomskk> good point
[21:02] <Randomskk> about a year
[21:03] <Randomskk> http://www.google.com/search?q=c%2F9.81m%2Fs^2
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[21:04] <Randomskk> but relativity means light particles would continue to move at the speed of light relative to the surface, doesn't it?
[21:04] <Randomskk> I dunno, I picked engineering rather than physics, could be wrong
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[22:22] <MikeMc> evening all
[22:22] <Randomskk> hi
[22:22] <MikeMc> What's up?
[22:22] <Randomskk> sunday evening and nowhere like enough work done over the weekend
[22:23] <MikeMc> yeah I know the feeling
[22:23] <Randomskk> my options are "do work at half ten on sunday" or "write it off"
[22:27] <jcoxon_> write it off :-p
[22:30] <jcoxon_> how does a 4 wire unipolar stepper motor work?
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[22:38] <jcoxon_> oh wait its bipolar - no worries
[22:42] <jcoxon_> hmmm maplin seem to have dumped even more of their stocked ICs
[22:42] <MikeMc> what are you after?
[22:44] <jcoxon_> wanted a L239D stepper motor driver
[22:44] <MikeMc> http://www.earthshinedesign.co.uk/index.php?route=product/category&path=63_45_64
[22:44] <MikeMc> I sell those
[22:44] <MikeMc> i'll let you have them for trade price
[22:44] <jcoxon_> ooooo perfect
[22:44] <MikeMc> How many do you need?
[22:45] <jcoxon_> i only need 1
[22:45] <jcoxon_> but best to get 2 :-p
[22:45] <jcoxon_> MikeMc, feel free to add your webshop to the wiki in the supplier section
[22:45] <russss> oh, nice site MikeMc :)
[22:45] <MikeMc> £2.48 each plus 61p postage
[22:46] <Randomskk> wow awesome.
[22:46] <russss> I need to restock on arduinos for the hackspace, so I shall probably have some roboduinos off you :)
[22:46] <Randomskk> you should probably add your site to more wikies and stuff, I haven't seen it before
[22:46] <Randomskk> arduino one notably
[22:46] <Randomskk> unless it's there and I've missed it, or it's new?
[22:46] <MikeMc> It's on the Arduino website as one of teh links
[22:46] <MikeMc> somewhere - it's ahrd ot find
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[22:50] <DanielRichman> What's the difference between the Roboduino and the Arduino?
[22:50] <MikeMc> nothing
[22:50] <MikeMc> they are identical in every way
[22:50] <MikeMc> clones are not allowed to call their Arduino's 'Arduino's
[22:50] <DanielRichman> Oh, right
[22:51] <MikeMc> So it is called something else
[22:51] <MikeMc> dumbass Arduino licence terms
[22:51] <DanielRichman> so much for open...
[22:51] <MikeMc> right
[22:55] <russss> it's a trademark
[22:56] <russss> you can use Arduino to describe what it is, you just can't call it an Arduino
[22:56] <russss> I think it's fair enough tbh. They designed the hardware and software and open-sourced it.
[22:57] <DanielRichman> Can't say too much for their design of the software though
[22:57] <DanielRichman> It does its job very well, granted, but doesn't make the best of the 16k memory
[22:59] <MikeMc> how much do you guys usually pay for DS1820's?
[23:00] <Jon_Apex> the temp sensors?
[23:00] <MikeMc> yeah
[23:00] <Jon_Apex> free samples from maxim
[23:00] <Randomskk> lol
[23:00] <Jon_Apex> i have loads
[23:01] <Randomskk> hi jon
[23:01] <Jon_Apex> hiya
[23:01] <Randomskk> lol so did you get much/any work done this weekend?
[23:02] <Jon_Apex> rest of electrics examples paper. couple of mechs, couple of structs, and maths revision and tripos qs
[23:02] <Randomskk> the first or second handout mech and structs?
[23:02] <Jon_Apex> first
[23:03] <Randomskk> MikeMc: I've not needed them much, but I'm usually too impatient to wait for samples so farnell's £5 in single qty
[23:03] <Randomskk> which is pretty extortionate but eh
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[23:03] <Randomskk> given as the 100 qty is like £2
[23:04] <Randomskk> Jon_Apex: lol I got nothing done, ended up reading a book most of today instead which was very relaxing but now it's like 2300 on sunday and the weekend has suddenly vanished
[23:04] <MikeMc> k
[23:04] <MikeMc> i'll see if i can source them cheaper
[23:04] <Jon_Apex> a common problem
[23:05] <jcoxon_> MikeMc, i want to get hold of a couple
[23:05] <MikeMc> k
[23:05] <Randomskk> Jon_Apex: also got no work done on the quad, this "no work at weekends" thing is getting worryingly repetitive
[23:06] <Randomskk> will just have to work even harder than usual (...) this week :P
[23:06] <Jon_Apex> haha
[23:06] <Jon_Apex> im away next weekend
[23:06] <Jon_Apex> so trying to get stuff done
[23:06] <Randomskk> we can both work really hard this week then?
[23:06] <Randomskk> omg no there is another examples paper handout
[23:06] <Jon_Apex> yup
[23:06] <Jon_Apex> indeed
[23:07] <Jon_Apex> maths examples paper time
[23:07] <Randomskk> madness
[23:07] <Randomskk> quite
[23:07] <Randomskk> the current one looks bad enough
[23:07] <Jon_Apex> oh dear
[23:07] <Randomskk> wow I only have maths and structmech supervisions apparently?... that seems a bit iffy, I'd better double check
[23:08] <Jon_Apex> yer thats right
[23:08] <Jon_Apex> its because this is the missing matheson electrics week
[23:08] <Randomskk> ooh yea
[23:08] <Randomskk> nice
[23:08] <Randomskk> well in that case plenty of time for work I suppose
[23:08] <Jon_Apex> yer
[23:08] <Randomskk> aka plenty of time to think "I should be doing some work..."
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[23:08] <Randomskk> and/or "I should really get that motor driver working" lol
[23:10] <Jon_Apex> yep
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[23:12] <Jon_Apex> im off. see you bright and early 2mo
[23:12] <Jon_Apex> h
[23:12] <Jon_Apex> *ha
[23:12] <MikeMc> ok i'm off to bed
[23:12] <MikeMc> night all
[23:13] <Randomskk> seeya
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[00:00] --- Mon Oct 26 2009