highaltitude.log.20080822

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[00:34] <fuzzylugnuts> my battery charger sucks
[00:34] <fuzzylugnuts> typical walmart junk
[00:35] <fuzzylugnuts> it charges, and then desulphates every cycle
[00:35] <fuzzylugnuts> the specific gravity meter says its only half charged when the charger says full
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[00:41] <Laurenceb> hi all
[00:42] <fuzzylugnuts> Hey
[00:44] <fuzzylugnuts> so there is a flight this weekend, yeah?
[00:45] <Laurenceb> I think so
[00:45] <fuzzylugnuts> groovy
[00:45] <fuzzylugnuts> best of luck to those flying
[00:47] <Laurenceb> robert1971: the ngw100 is no longer stocked by azzuri?
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[01:01] <fuzzylugnuts> : ( I wish I could have seen pink floyd in concert
[01:05] <Laurenceb> where?
[01:07] <fuzzylugnuts> anywhere
[01:07] <fuzzylugnuts> back before they got old though
[01:07] <fuzzylugnuts> like back in the 70s and early 80s
[01:13] <Laurenceb> my parents know the guy who did their light stuff when they first started out
[01:15] <fuzzylugnuts> haha, thats neat
[01:15] <fuzzylugnuts> oh, btw, my lassen iq's came in
[01:16] <Laurenceb> yeah
[01:16] <fuzzylugnuts> +10 to sparkfun for red boxes
[01:16] <Laurenceb> :P
[01:17] <Laurenceb> arg I've gone and forgotten what the name of the site was that resells sparkfun stuff in the uk
[01:17] <fuzzylugnuts> hark!
[01:18] <fuzzylugnuts> and btw: one of the most silly and dangerous things I've seen today: http://cgi.ebay.com/HYDROGEN-GENERATOR-FUEL-CELL-wind-solar-alternative-gas_W0QQitemZ120296142590QQihZ002QQcategoryZ3240QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
[01:24] <Laurenceb> ah robosavvy
[01:24] <Laurenceb> their servos are hardcore
[01:24] <Laurenceb> but most dont take pwm, so I couldnt really use them
[01:25] <fuzzylugnuts> awww
[01:26] <fuzzylugnuts> ah man
[01:26] <fuzzylugnuts> that reminds me
[01:27] <fuzzylugnuts> I was going to code in pwm to the gumstix robostix i2c-io program
[01:27] <Laurenceb> lol they have some with 1MBps RS485
[01:27] <fuzzylugnuts> hah
[01:27] <Laurenceb> crazyness
[01:27] <fuzzylugnuts> btw, got a couch: http://www.la-z-boy.com/furniture/product.aspx?pid=2115,
[01:27] <fuzzylugnuts> its more comfortable than my bed
[01:29] <Laurenceb> cool
[01:29] <fuzzylugnuts> its like, my first piece of real furniture
[01:30] <fuzzylugnuts> http://www.ornl.gov/adm/property/IMG_1092.JPG
[01:31] <fuzzylugnuts> last auction one like that sold for $100
[01:34] <Laurenceb> this looks maybe usable: http://robosavvy.com/store/product_info.php/cPath/26/products_id/144
[01:34] <fuzzylugnuts> whatcha working on?
[01:35] <Laurenceb> they sell some really good looking stuff - way better than RC, but its a bit big and high voltage
[01:35] <Laurenceb> a parafoil or rogallo
[01:35] <fuzzylugnuts> oh cool
[01:35] <Laurenceb> its on the wiki
[01:36] <fuzzylugnuts> I don't follow your wiki
[01:36] <Laurenceb> http://wiki.ukhas.org.uk/projects:parafoil_avr
[01:36] <Laurenceb> brb
[01:36] <fuzzylugnuts> d'awwww
[01:36] <fuzzylugnuts> thats cute
[01:45] <Laurenceb> I need to buy a good servo and a new rate gyro, so if I can find somewhere that will sell me both I'll save on postage - thats my plan
[01:46] <Laurenceb> but I want to avoid the servo setting the overall weight
[01:46] <fuzzylugnuts> I wouldn't know
[01:46] <Laurenceb> anyway, its nearly 2am here, time to get some sleep
[01:46] <Laurenceb> cya
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[01:50] <fuzzylugnuts> woooooo
[01:50] <fuzzylugnuts> gold space blankets on ebay
[02:01] <fuzzylugnuts> laters!
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[07:12] Topic changed on #highaltitude by jcoxon!n=jcoxon@85-210-99-31.dsl.pipex.com: Welcome to #highaltitude - discuss anything to do with high altitude projects (balloons, gliders, etc) www.ukhas.org.uk, wiki.ukhas.org.uk, logs: http://users.gridstar.net/~zeusbot/ HAPS-1 Launch 24/08/08 10am GMT+1
[07:19] <jcoxon> morning all
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[07:33] <jcoxon> morning edmoore
[07:33] <edmoore> hi
[07:36] <jcoxon> hows tricks?
[07:39] <edmoore> ok
[07:39] <edmoore> just wundergrounding
[07:39] <jcoxon> hehe the prelanch morning ritual
[07:39] <edmoore> not really up for work today
[07:39] <jcoxon> i'm going shopping today to trawl the ipswich camera shops
[07:40] <jcoxon> if i don't find anything i shall have to go to argos to get a A560 for 69.99
[07:41] <edmoore> loads of fun
[07:41] <edmoore> can't fault your sunday am logic
[07:42] <natrium42> jcoxon, have you decided when you launch?
[07:42] <jcoxon> natrium42, hehe, you know what the british weather is like
[07:42] <jcoxon> Sunday, 10am GMT+1
[07:42] <jcoxon> edmoore, its quite a nice traj
[07:42] <natrium42> oh, ok
[07:42] <natrium42> good :)
[07:43] <edmoore> yeah
[07:43] <jcoxon> its certainly a safe trajectory
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[07:45] <jcoxon> natrium42, is that a better time for you?
[07:46] <jcoxon> (though it is the very early morning
[07:46] <jcoxon> )
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[07:49] <natrium42> yes, it's a good time
[07:50] <jcoxon> cool cool
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[08:27] <jcoxon> bbiab
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[09:00] <gordonjcp> morning
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[11:25] <Laurenceb> hi everyone
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[11:48] <Laurenceb> hi jcoxon
[11:48] <jcoxon> hey Laurenceb
[11:48] <Laurenceb> just dropped an rs232 lead on my lassen iq
[11:48] <Laurenceb> slightly worrying... but it appears to still work
[11:49] <Laurenceb> electronics is streesful
[11:50] <Laurenceb> launch still on?
[11:50] <jcoxon> yup
[11:50] <jcoxon> sunday morn
[11:50] <Laurenceb> nice
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[11:50] <Laurenceb> I might be free to come down... will have to see
[11:50] <jcoxon> cool
[11:51] <Laurenceb> I'm thinking of getting a servo from robosavvy
[11:52] <Laurenceb> maybe this: http://robosavvy.com/store/product_info.php/cPath/26/products_id/144
[11:57] <jcoxon> oh damn
[11:57] <jcoxon> a560 doesn't support remote capture
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[12:05] Action: Laurenceb waits for one more gps sat
[12:05] <Laurenceb> the sirf2 could sometimes get a 2D lock off two sats
[12:06] <Laurenceb> but the lassen always needs 3... odd
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[12:30] <edmoore> jcoxon: ping
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[12:36] <jcoxon> edmoore,
[12:36] <jcoxon> pong
[12:36] <edmoore> hi
[12:36] <jcoxon> hey
[12:37] <edmoore> I think I just answered my own q
[12:37] <jcoxon> oh
[12:37] <jcoxon> right
[12:37] <edmoore> it was on what the telit needed to make it go itno AT command mode
[12:37] <jcoxon> the DTR line
[12:37] <jcoxon> or if the script completes its runthrough
[12:40] <edmoore> found a nice i2c to uart bridge chip to talk to the telit. That's a bit bonus as it frees up a hardware usart on the arm
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[12:40] <jcoxon> oh that sounds very cool
[12:40] <edmoore> which I want to keep free for my masters project :)
[12:40] <jcoxon> hehe
[12:42] <edmoore> actually I'll do it t'other way round
[12:42] <edmoore> no I won't
[12:42] <edmoore> flip a coin time
[12:45] <jcoxon> hehe
[12:45] <Laurenceb> hi edmoore
[12:45] <edmoore> hi Laurenceb, how's it going?
[12:46] <Laurenceb> not so bad, fine tuning the parafoil code
[12:46] <Laurenceb> pretty much ready to start making the airframe now
[12:47] <Laurenceb> I was looking at servos... what do you think to http://robosavvy.com/store/product_info.php/cPath/26/products_id/144
[12:48] <Laurenceb> I was considering using that with a 7.4v lipo
[12:48] <edmoore> those robot servos are pretty solid
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[12:49] <Laurenceb> yeah, but most dont take pwm
[12:50] <Laurenceb> I'll probably put it on a rogallo
[12:51] <edmoore> return of the rogallo
[12:51] <Laurenceb> cant find any good quaslity parafoil stunt kites that are small enough
[12:51] <Laurenceb> total mass should be <300 grams
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[12:56] <edmoore> for the kite or for everything?
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[13:25] <Laurenceb> sorry got dragged off
[13:26] <Laurenceb> for everything
[13:26] <Laurenceb> actually it should be less if I use lipo cells
[13:27] <Laurenceb> how do you connect to those servos? can they take standard horns?
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[13:34] <Laurenceb> hmm make that more with lipo... single use lithiums are actually a bit lighter
[13:35] <Laurenceb> edmoore: about?
[13:36] <edmoore> yes
[13:36] <edmoore> why the weight emphasis on the parafoil?
[13:36] <edmoore> I think a bit heavier has its advantages
[13:38] <Laurenceb> yeah
[13:38] <Laurenceb> but its a bit of a pain to test and launch when its heavier
[13:38] <edmoore> high wing loading and area/volume advantages are useful allied when it comes to dealing with the wind
[13:38] <Laurenceb> I know
[13:38] <Laurenceb> hency my plan to use a rogallo
[13:39] <Laurenceb> as I can build it small i.e. ~50cm wingspan
[13:39] <edmoore> aye, true
[13:40] <Laurenceb> previously I havent bothered
[13:40] <Laurenceb> and got trapped into letting heavy parts set the size of the whole thing
[13:40] <Laurenceb> so the rogallo ended up at almost a Kg
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[13:42] <Laurenceb> I'm thinking of using a slightly different steering technique - use a drum of some sort on the servo, then nylon line up to the wing
[13:42] <Laurenceb> but c of g shift as before
[13:43] <Laurenceb> it means I could enclose the servo better and keep it warmer
[13:44] <Laurenceb> but it might require use of a lathe...
[13:47] <Laurenceb> anyway I've gtg, be back this evening
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[13:55] <edmoore> Laurenceb: still there?
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[15:04] <jcoxon> amazing
[15:04] <jcoxon> it works
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[15:15] <edmoore> jcoxon: awesome
[15:16] <edmoore> how did you do it?
[15:16] <jcoxon> right so i loaded the camera with CHDK and added ascript to take a picture every minute
[15:16] <jcoxon> then i opened up a usb cable and put a switch on the +ve line
[15:17] <jcoxon> so the camera happily takes pictures, then when the switch is turned on it goes to usb mode where i can download the images, switch off and the camera goes back to looping and taking pictures
[15:17] <jcoxon> now i have to replicate the switch with a mosfet
[15:17] <jcoxon> so not completely finished
[15:19] <edmoore> but. method proven
[15:19] <edmoore> and that's what counts
[15:19] <jcoxon> indeed
[15:20] <jcoxon> now the mosfet
[15:20] <edmoore> fergus is going to hate me when I tell him we're getting new gyros
[15:20] <jcoxon> haha
[15:21] <jcoxon> for the mosfet i understand that pins 2(d) and 3 (s) are the switch but
[15:21] <jcoxon> but*
[15:21] <jcoxon> damn, bit*
[15:21] <edmoore> start again I'm lost
[15:21] <edmoore> drain and source
[15:21] <jcoxon> hehe
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[15:21] <jcoxon> yup
[15:21] <jcoxon> and thats where i attach the 5v line
[15:21] <jcoxon> and gnd
[15:22] <jcoxon> and then gate is where the GPIO goes to
[15:22] <jcoxon> but does gate need to be grounded as well?
[15:22] <ShellEvil> A MOSFET is off with 0V between gate and source.
[15:23] <ShellEvil> When you apply between 2 and 5V, it starts to turn on, and is all the way on between 5 and 15V - depending on the FET model
[15:23] <jcoxon> i've got a low power version
[15:23] <ShellEvil> When it's on, it acts like it has a small (typically) resistor between source and drain.
[15:24] <edmoore> so jcoxon: the gate needs to be on the same ground as the source
[15:24] <edmoore> gate pin off = mosfet off
[15:24] <edmoore> gate pin high = mosfet on
[15:24] <jcoxon> hmmm okay
[15:24] <ShellEvil> Err - no
[15:25] <ShellEvil> gate pin low = mosfet off
[15:25] <edmoore> check that works, I hope you won't need any kind of high side driving
[15:25] <ShellEvil> they don't draw any current - if you disconnect it, the gate will be at an undefined voltage.
[15:25] <jcoxon> component wise, a resistor between gate and source?
[15:25] <edmoore> to get a mosfet fully on you need to drive the gate with a voltage a bit higher than the drain/source voltage
[15:26] <ShellEvil> edmoore: err - no.
[15:26] <edmoore> put a 10k resistor between gate and source yeah
[15:26] <ShellEvil> edmoore: drive the gate with more than +-15V or so, and you'll explode the gate.
[15:26] <ShellEvil> edmoore: with respect to source.
[15:30] <edmoore> hence 'a little bit'
[15:30] <edmoore> apologies, I actually said 'a bit'
[15:31] <ShellEvil> It's really irrelevant to drain-source volts. You may be thinking of JFETs.
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[15:35] <ShellEvil> MOSFETs - if you turn the gate on by well over the threshold, and if the current is below some large fraction of the maximum current are pretty much resistors, irrespective of D-S volts.
[15:35] <jcoxon> whats now quite cool is that the camera will now be saving its pictures to the memory card
[15:35] <jcoxon> so in theory we now have 2 cameras
[15:36] <ShellEvil> :)
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[16:34] <edmoore> jcoxon: ping pm
[16:53] <jcoxon> hey ed
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[17:32] <jcoxon> guys
[17:33] <jcoxon> anyideas how to disconnect a usb cable with a mosfet?
[17:33] <ShellEvil> Damn hard.
[17:33] <jcoxon> placing it on ground allows me to turn on the device
[17:33] <jcoxon> but not off
[17:33] <ShellEvil> You need at least 8 MOSFETs, and high/low-side drivers.
[17:33] <ShellEvil> What do you mean by 'off' though.
[17:33] <jcoxon> basically the camera has a usb mode it enters when you insert the cable
[17:33] <ShellEvil> Ok.
[17:34] <jcoxon> and it goes back to normal when you unplug it
[17:34] <jcoxon> i want to simulate that
[17:34] <ShellEvil> It may simply react to switching 5V on and off.
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[17:34] <jcoxon> it does
[17:34] <ShellEvil> However, it may require an active USB host to go into 'I've got a USB cable plugged in' mode.
[17:34] <ShellEvil> So you're asking how to swtich the 5V on and off?
[17:34] <jcoxon> yeah
[17:35] <ShellEvil> You've got a micro on a 5V PSU, with adequate power to also run the camera?
[17:35] <jcoxon> i've got a gumstix with usb host
[17:35] <ShellEvil> Ok.
[17:35] <jcoxon> gpios though are at 3.3v
[17:35] <jcoxon> and i've got some low power mosfets
[17:36] <ShellEvil> any P-channel ones?
[17:36] <jcoxon> just N
[17:36] <ShellEvil> 2N7000s?
[17:36] <jcoxon> http://wiki.ukhas.org.uk/ideas:flight_support#pyrotechnic_cutdown_device
[17:36] <jcoxon> oops
[17:36] <jcoxon> wrong paste
[17:36] <jcoxon> STP36NF06
[17:37] <ShellEvil> That's not a low power FET :)
[17:37] <jcoxon> oops
[17:37] <jcoxon> of course
[17:37] <jcoxon> now it make sense
[17:37] <jcoxon> hehe
[17:37] <jcoxon> those were for another project
[17:37] <jcoxon> one sec
[17:38] <ShellEvil> np
[17:38] <ShellEvil> Is there any 12V or something supply rail available?
[17:39] <jcoxon> nope
[17:40] <jcoxon> ShellEvil, isn't teh STP36nF06 a logic level Power FET?
[17:41] <ShellEvil> If you've only got 5V available, then you require if you're using N-channel devices some way to put the voltage on the gate at 9V or so before it'll turn all teh way on.
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[17:41] <ShellEvil> It's a logic level FET - the gate power is zero (statically) in all FETs.
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[17:41] <ShellEvil> It's not low power really, as it's >30A
[17:42] <jcoxon> true
[17:42] <ShellEvil> Sorry - confused by the normal terminology.
[17:43] <ShellEvil> You need to use USB for signalling at the same time?
[17:43] <jcoxon> so heres whats happening
[17:43] <jcoxon> the camera has CHDK firmware and is taking a picture every minute
[17:43] <jcoxon> every so often the gumstix wants a picture to send via sstv
[17:43] <ShellEvil> In order to turn on the FET, you need to have the gate at 8V-9V relative to ground.
[17:44] <ShellEvil> Which is a problem if there is no source of around that voltage. What batteries are in it?
[17:44] <ShellEvil> (that FET)
[17:45] <jcoxon> the gumstix is at 4.5v and the power shot 3v
[17:45] <ShellEvil> 4.5 from what?
[17:45] <jcoxon> 3 AA lithiums
[17:45] <ShellEvil> you mean 3 AA or something?
[17:45] <ShellEvil> where are you getting the 5V for USB?
[17:45] <jcoxon> the goliath daughter board does all that
[17:45] <ShellEvil> Ok.
[17:46] <jcoxon> ShellEvil, my cutdown circuit is this: http://wiki.ukhas.org.uk/ideas:flight_support#pyrotechnic_cutdown_device
[17:46] <jcoxon> i was planning to use the same principle
[17:47] <ShellEvil> I would be very, very reluctant to use that without testing it lots at temperature.
[17:48] <ShellEvil> Yes, it's a 'logic level' but for many FETs that really means 5V
[17:48] <ShellEvil> http://wiki.ukhas.org.uk/ideas:flight_support#pyrotechnic_cutdown_dev
[17:48] <ShellEvil> ice
[17:48] <ShellEvil> oops
[17:48] <ShellEvil> www.datasheetcatalog.org/datasheet2/7/0tdxouc6pp311p9fzcex3cf360yy.pdf
[17:48] <ShellEvil> says that at -50C, the threshold voltage drifts up by around 10%
[17:49] <jcoxon> hmmm
[17:49] <ShellEvil> 3V is - for this FET - on the 'barely on' portion.
[17:49] <jcoxon> :-)
[17:51] <ShellEvil> From memory, extrapolating from the graph, I think the worst case (low) current at -50C and 2V Vds may be under 100mA
[17:51] <ShellEvil> with 3V Vgs
[17:54] Nick change: bobx -> ttls
[17:54] Nick change: ttls -> bobx
[17:55] <jcoxon> hmmho
[17:55] <jcoxon> regarding the camera
[17:55] <jcoxon> whats my best move?
[17:55] <ShellEvil> Looking for a simple solution ATM.
[17:56] <ShellEvil> Do you happen to have any max232s around?
[17:58] <jcoxon> not lying around
[17:58] <jcoxon> if pushed i could get some tomorrow
[17:59] <ShellEvil> The idea is to simply use it as a boost chip, to boost the voltage.
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[17:59] <ShellEvil> Alternatively, a 9V battery and a couple of bipolar transistors would work fine.
[17:59] <ShellEvil> Or one of those little teeny 12V instrument batteries.
[18:00] <jcoxon> i'm wondering if there is a completely different way of doing this
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[18:00] <ShellEvil> Basically - port pin - 10K resistor - 10k resistor - ground
[18:00] <ShellEvil> junction of two resistors to base of any small signal NPN transistor.
[18:00] <ShellEvil> Emitter to ground
[18:00] <ShellEvil> collector to 10K resistor to +
[18:01] <ShellEvil> wire teh gates to the collector.
[18:01] <ShellEvil> Job done.
[18:02] <jcoxon> so just 2x 10k resistors and a NPN transitor
[18:03] <ShellEvil> 3*
[18:03] <ShellEvil> but yes
[18:03] <jcoxon> oh yeah
[18:03] <ShellEvil> Almost any small signal transistor will work fine.
[18:03] <jcoxon> and we stick this on the 5v line of teh usb cable
[18:03] <ShellEvil> hfe>10, and Ic >1mA - which you'd have to try damn hard to find one that won't.
[18:03] <ShellEvil> No.
[18:04] <ShellEvil> you stick this onto a little 12V battery - to provide the V+ supply - grounded on the ohter side.
[18:04] <ShellEvil> Then use one of the above power FETs to do the actual switching.
[18:04] <jcoxon> okay
[18:05] <ShellEvil> http://www.cpsbatteries.co.uk/product_info.php?products_id=986
[18:05] <ShellEvil> One of those
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[18:05] <ShellEvil> How it works is to simply act as an inverter/amplifier - to make the input 0-3.3 0-12V
[18:06] <ShellEvil> Which is absolutely plenty for the cutdown and camera gate drive.
[18:08] <fuzzylugnuts> fnoble: I went to the auction place to inspect the stuff this morning, and on one pallet is a nim bin -full- of modules
[18:09] <jcoxon> biab
[18:09] <fuzzylugnuts> another pallet has craploads of RF amps on it
[18:10] <fuzzylugnuts> there is also a 7.5V, 3000A and 5V 4500A power supply up for bid
[18:19] <jcoxon> ShellEvil, oh i think i've worked it out
[18:19] <jcoxon> and its a lot more elegant solution
[18:19] <jcoxon> just requiring the chdk firmware
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[18:20] <jcoxon> they've implemented this thing where you can trigger the camera using usb
[18:20] <jnd> hey
[18:21] <jcoxon> hey jnd
[18:21] <jcoxon> when this setting is turned on the camera doesn't respond to the usb (i.e. doesn't go connect to thegumstix
[18:21] <jcoxon> )
[18:22] <jcoxon> now if i stick this in the auto take picture script i can control when and where the camera goes into usb mode
[18:22] <jcoxon> right food time
[18:34] <fnoble> fuzzylugnuts, oooh cool, you didnt happen to take not of that modules there were in it?
[18:34] <fnoble> jcoxon, back now
[18:34] <fnoble> jcoxon, remembered to get the regulator
[18:34] <fnoble> :)
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[18:34] <fuzzylugnuts> fnoble: some SCAs, a delay genreator, amps and a hv pwr supply
[18:35] <fnoble> jesus thats basically all i need
[18:35] <fnoble> plus a preamp
[18:35] <fuzzylugnuts> no, mine!
[18:35] <fuzzylugnuts> ; P
[18:35] <fnoble> :( awww
[18:36] <fnoble> how much do you recon it will go for?
[18:36] <fuzzylugnuts> there were a bunch of other modules too, in boxes, but i don't know what ocndition they were in. I'll take what I need for work and sell the rest, to you probably.
[18:37] <fuzzylugnuts> the pallet will probably got for 300 or higher
[18:37] <fuzzylugnuts> my max will be about 500-600
[18:37] <fnoble> yeah
[18:38] <fuzzylugnuts> I can sell the rest of the stuff on ebay
[18:38] <fuzzylugnuts> or there right after the auction
[18:38] <fuzzylugnuts> when you win something, often a bunch of people who lost come up to you
[18:39] <fuzzylugnuts> the best thing is.. they take credit card X3
[18:39] <fnoble> dangerous
[18:39] <fnoble> in the heat of the moment
[18:40] <fnoble> easy to forget you are spending real money
[18:40] <fuzzylugnuts> eh, not really
[18:40] <fnoble> but randon NIMmodules routinely sell for $100 each so you could easily make a profit
[18:41] <fuzzylugnuts> yeah
[18:42] <fuzzylugnuts> I couldn't find a frequency range on the rf amps though
[18:44] <fnoble> when is the auction?
[18:44] <fuzzylugnuts> tomorrow
[18:45] <fuzzylugnuts> its a shame, they used to let employees get first dibs
[18:45] <fnoble> yeah
[18:46] <fnoble> i dont know how much spare cash i have atm but let me know what you dont want and maybe i could make an offer
[18:46] <fuzzylugnuts> Sure, sounds good
[18:46] <fnoble> im mainly looking for an SCA, liner amp, preamp and hv supply
[18:46] <fuzzylugnuts> Ok
[18:47] <fuzzylugnuts> oh man, I ordered a scintillation preamp from ortec the other day, cost $1400
[18:47] <fnoble> blimey
[18:47] <fuzzylugnuts> Yeah, glad its not my money
[18:47] <fnoble> yeah
[18:48] <fuzzylugnuts> I did get to go on a tour of the ortec facility here in oak ridge, including the crystal growing area
[18:48] <fuzzylugnuts> its one of 3 places in the world they grow high purity germanium crystals.
[18:49] <fuzzylugnuts> purity is 99.9999999999999%
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[18:54] <fuzzylugnuts> fnoble: anything else I can't say because of the NDA they made us sign the second we got in the door
[18:59] <jcoxon> evening RocketBoy1
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[19:03] Action: ShellEvil ponders high purity geranium crystals.
[19:03] <ShellEvil> jcoxon: great
[19:03] <jcoxon> not working yet
[19:03] <jcoxon> but it think it might
[19:04] <jcoxon> going to keep pushing on
[19:04] <ShellEvil> I think the possible low cutdown current may be a real issue that should be tested.
[19:04] <ShellEvil> Diddn't you have a failure?
[19:04] <jcoxon> hehe we've had lots of failures
[19:05] <ShellEvil> At least check on the ground that it's >>1A
[19:05] <jcoxon> once the camera is done i'll move on to that
[19:05] <jcoxon> still got tomorrow :-)
[19:05] <jcoxon> and the weather is good enough not to require a cutdown
[19:05] <jcoxon> (famous last works)
[19:05] <jcoxon> words*
[19:06] <ShellEvil> only cutdown if it's a water landing?
[19:06] <jcoxon> yeah
[19:08] <fnoble> jcoxon, hello
[19:08] <jcoxon> hey fnoble
[19:08] <fnoble> all set? :)
[19:08] <jcoxon> nope
[19:08] <jcoxon> hehe
[19:09] <fnoble> fuzzylugnuts, sounds interesting
[19:10] <fnoble> fuzzylugnuts, whats the Ge used for? charged particle detectros?
[19:10] <fuzzylugnuts> hpge is for photons
[19:11] <fnoble> ok
[19:12] <fnoble> for xray spec?
[19:13] <fuzzylugnuts> more for radionuclide identification
[19:14] <fnoble> i wonder if normal diodes could be used as a crude alpha/beta detector? if you removed some of the plastic hehe
[19:16] <fuzzylugnuts> at the idaho accelerator center, we used diodes in reverse polarity for beam diagnostics
[19:17] <fnoble> neat
[19:25] <fuzzylugnuts> you should have seen the size of the one powersupply they are selling
[19:25] <fuzzylugnuts> dual output, 7.5V@3000A, and 5V@4500A
[19:26] <ShellEvil> plating?
[19:26] <fuzzylugnuts> I have noooooo idea
[19:26] <fuzzylugnuts> this crap comes out of the national alb
[19:26] <fuzzylugnuts> *lab
[19:27] Action: ShellEvil wishes again for decent auctions nearby.
[19:27] <RocketBoy1> rail guns
[19:27] <fuzzylugnuts> haha
[19:27] <fnoble> fuzzylugnuts, what is the input supply?
[19:27] <ShellEvil> Teeny railgun.
[19:28] <ShellEvil> Railgun PSUs are _insane_.
[19:28] <ShellEvil> 'warehouse of lead-acid batteries' typically AIUI.
[19:28] <fuzzylugnuts> 480V single phase
[19:28] <ShellEvil> Simply as it's the cheapest way to get the pulse power.
[19:29] <fnoble> fuzzylugnuts, never seen one of those, is it common in the US?
[19:29] <fuzzylugnuts> *nod* yeah, industrial utility
[19:29] <fnoble> ShellEvil, just pour a load of sulphuric acid into your swimming pool and get some roofing lead
[19:29] <fuzzylugnuts> I want to go swimmin!
[19:30] <fuzzylugnuts> the goggles, they do nooooothing!
[19:30] <fnoble> hehe
[19:30] <fnoble> imagine explaining that in court
[19:31] <fnoble> yes sir, i was trying to build a railgun and...
[19:41] <fuzzylugnuts> i couldn't sleep last night so I covered my extruded aluminum box in kapton tape.
[19:41] <jnd> germanium? today I bought 20 npn transistors :p
[19:42] <jnd> 32 actually
[19:42] <fuzzylugnuts> for?
[19:42] <jnd> and six 5V regulators in TO3
[19:42] <jnd> dunno yet, I like it retro :)
[19:42] <fuzzylugnuts> hehe
[19:43] <jnd> but I'll use it
[19:43] <fnoble> jnd, germanium transistors apparently sound nice in diy effects pedals
[19:43] <jnd> it is inetersting they made 1A regulators in TO3
[19:44] <jnd> looks nice anyway
[19:44] <fuzzylugnuts> I've got a leftover opa128 from a project, might make an electrometer out of it
[19:45] <ShellEvil> Retero is silly.
[19:45] <ShellEvil> http://uk.farnell.com/jsp/search/productdetail.jsp?sku=1463245
[19:45] <fuzzylugnuts> mmmm, d-pakkkkk...
[19:45] <jnd> why silly?
[19:46] <fuzzylugnuts> http://68.34.212.42/fc/4_channel_output_buffer.jpg
[19:46] <ShellEvil> Just with insanely cheap fun new stuff.
[19:46] <ShellEvil> 42A FET for 9p.
[19:47] <fuzzylugnuts> nice
[19:48] <jnd> for that price I get it all
[19:48] <jnd> ~10p
[19:51] <jnd> and ~£1 for one RTC with integrated crystal and battery is cheap too imo
[19:51] <akawaka> http://www.hapb.net/
[19:51] <akawaka> who is that?
[19:51] <fuzzylugnuts> hey cool
[19:52] <fuzzylugnuts> earl foster
[19:52] <fuzzylugnuts> evidently
[19:55] <fnoble> meaty payloads
[19:55] <fnoble> i like it
[19:57] <fuzzylugnuts> is that some kind of HAB service, or competition?
[20:03] <fuzzylugnuts> it seems like a sharp program
[20:03] <jcoxon> dum dee dum dum
[20:03] Action: jcoxon waits for his new CHDK build environment to compile
[20:04] <fuzzylugnuts> while you wait....
[20:04] <fuzzylugnuts> http://www.i-am-bored.com/bored_link.cfm?link_id=32972
[20:05] <jcoxon> haha
[20:05] <fuzzylugnuts> and.....
[20:05] <fuzzylugnuts> http://www.i-am-bored.com/bored_link.cfm?link_id=33000
[20:05] <fuzzylugnuts> baned cartoons
[20:11] <fnoble> got to go, bye
[20:11] <fuzzylugnuts> laters
[20:12] Nick change: fnoble -> fnoble|away
[20:13] Nick change: Ei5GTB_ -> EI5GTB
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[20:32] <fuzzylugnuts> hmm
[20:33] <fuzzylugnuts> my laundry card is a smart card
[20:33] <fuzzylugnuts> and has no link to my name...
[20:33] <fuzzylugnuts> I wonder how hard it would be to put cash on it.
[20:36] <ShellEvil> Probably not enough storage space.
[20:36] <ShellEvil> http://www.youtube.com/watch?v=SmVAWKfJ4Go
[20:36] <fuzzylugnuts> have that video
[20:42] <ShellEvil> http://www.youtube.com/watch?v=57ta7mkgrOU :)
[20:43] <fuzzylugnuts> HAHAHAHAHA
[20:43] <fuzzylugnuts> d'awwwww
[20:43] <fuzzylugnuts> thats cute, he's cooking heroin!
[20:44] <fuzzylugnuts> much of an Arcade Fire fan?
[20:44] <ShellEvil> Nope.
[20:44] <fuzzylugnuts> ok
[20:44] <ShellEvil> They're OK - I wouldn't describe myself as a fan though.
[20:45] <fuzzylugnuts> *nod* I like some of their stuff
[20:46] <fuzzylugnuts> http://www.youtube.com/watch?v=Pyp34v6Lmcc
[20:51] <fuzzylugnuts> how about type o negative?
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[22:35] <natrium42> jcoxon, any luck with the camera?
[22:35] <jcoxon> ummm no
[22:35] <jcoxon> so close
[22:35] <natrium42> i'd just use a relay :P
[22:36] <jcoxon> still got 24 hrs :-p
[22:37] <natrium42> enough time to make a 2nd payload!
[22:37] <jcoxon> haha
[22:37] <natrium42> who needs sleep
[22:37] <natrium42> isn't it more than 24 hours, though?
[22:37] <jcoxon> yeah
[22:38] <jcoxon> should have just got a new A60
[22:38] <natrium42> dunno why canon decided to remove remote capture on most new cameras...
[22:38] <natrium42> i guess not many people use that feature
[22:38] <jcoxon> also they want people to buy dslrs
[22:38] <natrium42> the only recent consumer camera to have it is the SX100
[22:39] <natrium42> it also has a quite big lens, which is good for quality
[22:39] <natrium42> unfortunately a whopping 10MPm though...
[22:39] <natrium42> *10MP
[23:14] <gordonjcp> so what's the current theory on the weekend?
[23:17] <jcoxon> so sunday morn launch
[23:30] <jcoxon> any coding geniuses around?
[23:32] <RocketBoy1> like what?
[23:32] <jcoxon> hehe
[23:33] <jcoxon> in C
[23:33] <jcoxon> when an & is before something what does that mean?
[23:33] <RocketBoy1> the addres of
[23:33] <RocketBoy1> ie &i is the address of i
[23:33] <RocketBoy1> so int i;
[23:34] <RocketBoy1> int *pint;
[23:34] <RocketBoy1> pint = &i;
[23:34] <RocketBoy1> is valid pint points to i;
[23:34] <jcoxon> i have this line:
[23:34] <jcoxon> {LANG_MENU_SCRIPT_REMOTE_ENABLE, MENUITEM_BOOL, &conf.remote_enable},
[23:35] <jcoxon> let me start at the beginning
[23:35] <RocketBoy1> yep thats taking (passing) the address of conf.remote_enable
[23:36] <jcoxon> basically there is a setting on teh camera which i want to control
[23:36] <RocketBoy1> its not c++ is it?
[23:36] <jcoxon> the files a .c
[23:36] <RocketBoy1> ok
[23:37] <jcoxon> so could conf.remote_enable contain a bool?
[23:37] <RocketBoy1> yeah if conf.remote_enable is a BOOL
[23:38] <RocketBoy1> then &conf.remote_enable would be taking the address of the BOOL
[23:40] <jcoxon> hmmmm, so i need to add a function to to the scripting lib that takes the variable and sticks it in conf.remote_enable
[23:43] <RocketBoy1> looking at some other code on the net conf.remote_enable is being treated as a BOOL
[23:45] <RocketBoy1> not sure what your trying to do with it - looks like some menu construction scripts (a bit like windows menu SDKs)
[23:47] <RocketBoy1> BTW - I managed to test out the new version of SSTVTX - works fine
[23:47] <jcoxon> oh cool
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[23:49] <RocketBoy1> actually the main source of its slowness is the sample rate its using 48KHz - which its a bit OTT for generating 2.3KHz SSTV
[23:50] <jcoxon> RocketBoy1, how would i pass a bool to conf.remote_enable?
[23:50] <RocketBoy1> If it was reduced to 12KHz it would be about 4 times faster. 12KHz would be more than enough IMO
[23:51] <RocketBoy1> do you mean how would you set conf.remote_enable?
[23:51] <jcoxon> lyeah
[23:51] <jcoxon> yeah*
[23:51] <RocketBoy1> conf.remote_enable = TRUE
[23:51] <RocketBoy1> since &conf.remote_enable seems valid
[23:52] <RocketBoy1> then conf.remote_enable must be in scope - so you should just be able to assign it
[23:52] <RocketBoy1> (i.e. set it)
[00:00] --- Sat Aug 23 2008