highaltitude.log.20120121

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[00:15] <Randomskk> :D gigantic capacitors http://www.flickr.com/photos/randomskk/6733339103/in/photostream/
[00:15] <Randomskk> http://www.flickr.com/photos/randomskk/6733340307/in/photostream/ rather
[00:20] <Zuph> 2200uF, psh.
[00:20] <Zuph> Sat Shield will be sporting 1F+
[00:20] <BrainDamage> Randomskk: http://img43.imageshack.us/img43/1442/imageznby.jpg
[00:20] <Randomskk> Zuph: yea, this is just the amp section, not the power supply
[00:20] <Randomskk> the power supply caps don't fit on the board, of course :P screw terminals all the way
[00:21] <BrainDamage> http://img838.imageshack.us/img838/1197/imag0022j.jpg
[00:21] <Randomskk> BrainDamage: haha nice
[00:21] <Randomskk> wow, that is a lot of very chunky caps
[00:21] <Randomskk> what're they for?
[00:21] <Zuph> heh
[00:21] <Zuph> Randomskk: What's the amp for?
[00:21] <Randomskk> audio :P
[00:22] <BrainDamage> 10kA peak discharge PSU
[00:22] <Randomskk> mostly just for fun really. I have some nice speakers but nothing really to drive them with and want to be able to drive them from my computer
[00:22] <BrainDamage> I used them with a railgun
[00:22] <Randomskk> so it's a class D 25W stereo amp, but with some overkill in parts of the engineering for fun
[00:22] <Randomskk> so like, it's all modular inside, and I think I'll be using a bunch of relays and resistors to do volume control, all the modules will be on an i2c bus, might add a fm radio, have pretty light-up front panel and a remote control and all that.
[00:22] <Randomskk> some lovely connectors too
[00:23] <Randomskk> BrainDamage: sweet!
[00:23] <Randomskk> yea railguns and coilguns are totally what that kind of cap is made for
[00:23] <Zuph> I've got some ~1mF, 5kV caps at the hackerspace
[00:23] <Zuph> Randomskk: Oh neat
[00:23] <Randomskk> so far I've designed the PSU and the power amp parts
[00:23] <Randomskk> which is enough to start listening to music
[00:23] <Zuph> I admit, I never really grokked analog design.
[00:24] <Randomskk> going to think about the rest of the system and design the case, then start on the PCBs for volume control, source select, remote control, front panel stuff, etc
[00:24] <BrainDamage> 1mF 5kV? wow
[00:24] <Randomskk> the power supply is kinda basic, too, that said. it's essentially a big transformer, lots of caps, a diode bridge and two high currentswitch mode regulators
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[00:24] <russss> wait, 1mF?
[00:24] <Randomskk> analogue design is kind of... odd
[00:24] <BrainDamage> it stores 12.5kJ energy
[00:24] <Zuph> I blame my analog design prof.
[00:24] <russss> I think I have a 1uF 2.5kV.
[00:24] <Randomskk> I had a course in a lot of audo and radio analogue magic last term, so played with some of it
[00:24] <SpeedEvil> Boom.
[00:24] <russss> and that one cost a fair bit
[00:25] <Zuph> Got his pHD from the 3rd best engineering school in Pakistan, he did.
[00:25] <russss> I used to use that to blow up smaller, less capable capacitors in a messy and amusing way
[00:25] <Randomskk> was going to make the amp class A and have a ton of fun with heatsinks and discrete transistors for amplifying etc, but decided to go class D in the end because it's just easier
[00:25] <Randomskk> russss: haha
[00:25] <russss> also resistors
[00:25] <Zuph> russss: oops, off by an SI prefix. 1uF, IIRC
[00:25] <Zuph> I know it has 625 J stamped on the case.
[00:25] <BrainDamage> now that's more reasonable
[00:25] <russss> hah yes, that sounds more like it
[00:25] <Randomskk> that's a lot of energy to dump into something
[00:26] <russss> it's still a fair amount of joules
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[00:26] <Zuph> It is
[00:26] <russss> unfortunately my HV DC PSU died
[00:26] <Zuph> I would prefer more voltage, though.
[00:26] <gonzo__> 1mF sounded fun
[00:26] <russss> marx generator
[00:26] <Zuph> Trying to blow up watermelons with my mind.
[00:27] <gonzo__> my biggest psu at the mo is 1.7kv, though it will give an amp
[00:27] <Zuph> I've got a 5kv psu somewhere. .5A, I think.
[00:28] <Zuph> My uncle used it for a bunch of RF stuff in the 80's. Manufactured in East Germany.
[00:28] <gonzo__> have a 2.4kv transformer somewhere, which is a lump. A proper two handed lift
[00:28] <russss> I have a neon tube PSU
[00:28] <russss> which does I think 6kV, but at tiny current
[00:28] <gonzo__> nice, good for playing valves
[00:28] <russss> and very high internal resistance
[00:29] <russss> I used it to fill one of our broken laser cutter tubes with plasma
[00:29] <gonzo__> neon sign txfmers are ideal for making teslar coils
[00:29] <russss> which was cool
[00:29] <russss> also I did a low-budget jacob's ladder with it
[00:29] <SpeedEvil> I have enough wall-warts that if I immerse them in oil, and connect all of the outputs in series, I get 3KV
[00:29] <russss> hah
[00:29] <BrainDamage> russss: 1MV suffices? ( only 50uA sustained tough ) http://img215.imageshack.us/img215/1300/photo091211173016.jpg
[00:30] <gonzo__> hehe, suspect they will flash to mains first
[00:30] <russss> hah
[00:30] <gonzo__> I used to make txformers for ozone generators. they were 8kv at about 3kw
[00:31] <BrainDamage> 3kW ozone generators? was it a swimming pool or industrial batch production?
[00:31] <gonzo__> I can't remember to be honest
[00:32] <gonzo__> first job was a lab tech at a power research lab
[00:33] <gonzo__> remember that we had to vacuum pot them, as if you had air bubbles in the potting, the hv field would arc and blow it up
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[01:20] <Lunar_Lander> hi juxta
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[08:30] <nosebleedkt> Hey
[08:30] <nosebleedkt> Anyone awake ?
[08:32] <Upu> morning
[08:34] <natrium42> yo
[08:34] <natrium42> http://www.reddit.com/r/outletporn
[08:39] Action: Upu ponders natrium42
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[08:42] <fsphil> huh
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[08:43] <natrium42> :D
[08:44] <natrium42> sup my habies?
[08:45] <fsphil> watching the horus dudes: https://www.youtube.com/watch?v=rb8XOwacRKA
[08:46] <natrium42> oh, sweet
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[09:17] <natrium42> nice intro :D
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[09:27] <Jessica_Lily> zoom
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[09:50] <fsphil> saturday morning at work. yay
[09:50] <daveake> Nice
[09:51] <fsphil> gotta pay for all ths helium!
[09:52] <daveake> Helium ... latex ... petrol ... gaffer tape ... the list goes on :)
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[10:03] <RKD> Just finished watching the Horus video and the prezzo, excellent stuff
[10:04] <fsphil> yea it was well presented
[10:04] <fsphil> I'd need to learn a bit from these guys
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[10:15] <costyn> morning
[10:17] <costyn> I'm looking for a GPS for a ground-based robot or uav (so no 18km+ requirement). What would you guys recommend? Something not too pricey and which comes on a breakout
[10:22] <Laurenceb_> Randomskk: ok ive got kicad working now
[10:22] <Laurenceb_> got a simple pcb - it doesnt like me loading a load of libraries :P
[10:23] <Laurenceb_> also the eagle conversion is partially broken :(
[10:36] <cuddykid> morning all
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[11:52] <SpeedEvil> Nokias bold way to get windows phones selling:
[11:52] <SpeedEvil> http://www.argos.co.uk/static/Product/partNumber/5280612.htm?storeId=10001&referredURL=http%3A%2F%2Fwww.argos.co.uk%2Fstatic%2FProduct%2FpartNumber%2F5280612.htm&jspStoreDir=argos&_%24ja=tsid%3A11674|prd%3A1546795&referrer=COJUN&cmpid=COJUN
[11:54] <fsphil> ooch
[11:57] <Upu> thats cheap
[11:57] <SpeedEvil> Ridiculously so.
[11:57] <SpeedEvil> Well.
[11:58] <SpeedEvil> Ridiculously if it was a viable platform.
[11:58] <Laurenceb_> anyone here used git over ssh?
[11:58] <Laurenceb_> i ssh into my machine and try to git push
[11:59] <Laurenceb_> Permission denied (publickey).
[11:59] <Laurenceb_> fatal: The remote end hung up unexpectedly
[11:59] <Laurenceb_> any ideas what wrong?
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[11:59] <SpeedEvil> you sure you're using the right username on the far end?
[12:01] <Laurenceb_> yes
[12:03] <Darkside> http://www.flickr.com/photos/chrisjrn/6735388619/in/photostream/
[12:04] <SpeedEvil> ?
[12:05] <Darkside> talking at LCA2012
[12:05] <Darkside> theres more pics in teh stream, including some of our launch
[12:05] <Darkside> well, launches
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[12:05] <Darkside> we did 2
[12:06] <SpeedEvil> ah - :)
[12:06] <Darkside> lost one, got the other back
[12:06] <SpeedEvil> I was assuming the IBM thingy in the background meant something
[12:06] <Darkside> and even got video of it landing
[12:07] <Darkside> sponsors
[12:07] <SpeedEvil> I see
[12:07] <Darkside> the conference was sponsored by IBM and Internode
[12:07] <Darkside> (Project Horus isn't sponsored by IBM, however cool that might be)
[12:07] <Darkside> the talk was videos, and is available here: http://rfhead.net/data/Tux_in_Space_High_altitude_ballooning.ogv
[12:07] <SpeedEvil> :)
[12:07] <Darkside> videod*
[12:08] <SpeedEvil> I think that's likely to be more common.
[12:08] <SpeedEvil> Hmm.
[12:08] Action: SpeedEvil realises pi-day could be a realistic launch date.
[12:08] <SpeedEvil> (for raspberry)
[12:08] <Darkside> bleh
[12:08] <Darkside> make sure you heat he main CPU
[12:08] <Darkside> else you'll do a Tim
[12:09] <SpeedEvil> yeah - modern chips have VCOs in them
[12:09] <Darkside> PLL multipliers
[12:09] <SpeedEvil> which typically say 'you gotta recalibrate after large delta-t
[12:09] <SpeedEvil> and nobody does
[12:09] <Darkside> yep
[12:09] <Darkside> get it too cold and it'll lose lock
[12:09] <Darkside> and your cpu will crash
[12:10] <Darkside> we're looking at doing a beaglebone launch
[12:10] <Darkside> but we'll be making sure the cpu is heated
[12:10] <SpeedEvil> hmm
[12:10] <Darkside> i'm preferring the beaglebone over the raspberry pi for ballooning
[12:10] <Darkside> as it doesnt have as much extratenous shit that we'll never use
[12:11] <Darkside> also support for it is community based, not just from the people who have access to the CPUs specs
[12:11] <SpeedEvil> Well - yes.
[12:11] <Darkside> the broadcoms SoC's datasheets are NDA'd
[12:11] <SpeedEvil> I'm preferring it from the fact I can get 3? for the price of a bone.
[12:11] <Darkside> well yes
[12:11] <SpeedEvil> Assuming the support is 'good enough'
[12:11] <Darkside> it sure is cheaper
[12:12] <SpeedEvil> If they get at all close to their sales figures, by even an order of magnitude, there will be a reasonable community.
[12:12] <Darkside> but they won't have access to the datasheets
[12:12] <SpeedEvil> I haven't investigated if there are sourceballs.
[12:12] <Darkside> support will only be from the manufacturers
[12:12] <Darkside> well weknow broadcoms history with drivers
[12:13] <Darkside> lovely binary blobs
[12:13] <SpeedEvil> The head guy is at board level at broadcom.
[12:13] <SpeedEvil> Which may change stuff.
[12:13] <Darkside> i doubt it'll be open sourced though
[12:15] <SpeedEvil> Does the bone have a GPU blob?
[12:16] <Darkside> it doesnt have the video processor i think
[12:16] <Darkside> ack
[12:16] <SpeedEvil> ah
[12:16] <Darkside> beaglebone has no video out
[12:16] <Darkside> but there is a shield which does DVI
[12:16] <SpeedEvil> Doesn't that mean it's on the processor?
[12:17] <SpeedEvil> Unless some wacky shit is being smoked.
[12:17] <Darkside> oh it does do 3D
[12:17] <Darkside> it does have video acceleration
[12:17] <Darkside> lemme find out what video driver it uses
[12:20] <Darkside> not sure
[12:20] <Darkside> something intel
[12:20] <Darkside> wait, no its TI
[12:20] <Darkside> derp
[12:22] <Darkside> https://github.com/beagleboard/linux/tree/master/drivers/video/omap2
[12:22] <Darkside> i presume its in there
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[13:02] <Upu> thats cheap
[13:02] <Upu> ~A|
[13:12] <Laurenceb_> anyone here used git over ssh?
[13:12] <Laurenceb_> cant fix this thing :/
[13:15] <NigelMoby> I have, but not much, wat ya broke?
[13:16] <Laurenceb_> i ssh into my machine and try to git push
[13:17] <Laurenceb_> ie im pushing from a remote machine
[13:17] <Laurenceb_> Permission denied (publickey).
[13:17] <Laurenceb_> fatal: The remote end hung up unexpectedly
[13:17] <Laurenceb_> i guess there is a way to fix this
[13:17] <Laurenceb_> scp the whole thing over to my machine
[13:17] <Laurenceb_> that'd be the same as git push then git pull at my end right?
[13:18] <NigelMoby> Eww that's nice of git, scp it if I were u
[13:18] <Laurenceb_> its something to do with permissions
[13:18] <Laurenceb_> i tried it with X forwarding but that wont work
[13:19] <NigelMoby> yeah, perms on the keys maybe?
[13:19] <Laurenceb_> im guessing its throwing up a dialogue box at the remote machine to endter password
[13:19] <NigelMoby> Ahh yeah could be
[13:19] <Laurenceb_> ill scp it to my machine then git push to github from here
[13:25] <cuddykid> annoying - left multimeter at uni
[13:26] <Hiena> cuddykid: use your soundcard.
[13:26] <cuddykid> Hiena: huh?! How? :P
[13:27] <Hiena> Simply, short the input capacitor, and attach a voltage divider to it. It's basically a AD converter scaled to 0-1V
[13:28] <Laurenceb_> ill have to try that
[13:28] <Hiena> i made a simple oscilloscope by this way.
[13:29] <Hiena> The samplerate is low, but enough for a basic audio debug.
[13:30] <Hiena> Also, used a sound card for thrust measurement and data logging.
[13:37] <cuddykid> ahh cool
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[13:41] <Hiena> Not to mention, the average sound card at least 16 bit, while the average multimeter only 10 or 12 bit.
[13:42] Action: SpeedEvil was annoyed to realise that cheap soundcards are often 12.
[13:42] <SpeedEvil> (cheap = $3)
[13:42] <SpeedEvil> And mono.
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[13:45] <NickB1> 12bit over a 1V range isnt that bad
[13:54] <SpeedEvil> no
[14:02] <eroomde> rr
[14:03] <eroomde> whoops
[14:15] <cuddykid> what happens at the end of the payload generator? It just says please submit the document above - but there looks like a snippet of web address :S
[14:20] <DanielRichman> cuddykid: it should be a box with some json in, which you can copy and paste to pastie.org or similar
[14:21] <DanielRichman> and send that to myself, Randomskk or come to #habhub and we can add it to the database for you.
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[14:43] <cuddykid> DanielRichman: ahh ok, got it :D
[14:43] <Laurenceb_> http://static.rcgroups.net/forums/attachments/3/8/7/1/7/8/a4569500-54-DSC_8348.jpg
[14:43] <cuddykid> thanks
[14:46] <Laurenceb_> thats what we need in case of future tree landings :P
[14:49] <cuddykid> indeed
[14:49] <SpeedEvil> With shrouds
[14:49] <Hiena> Ehem. Seems the copter survived much better the accident than thee tree.
[14:49] <SpeedEvil> Also, optical breakers to kill a rotor on something getting close.
[14:50] <Laurenceb_> mouse sensor ftw
[14:50] <Laurenceb_> or camera + powerful board
[14:50] <Laurenceb_> something r-pi might be good for, if the camera interface has drivers
[14:51] <Hiena> Yup. Or a good old optical proximity sensor.
[14:51] <Laurenceb_> having said that some of the STM32 have camera interface
[14:51] <SpeedEvil> Couple of LEDs under the rotor, and a couple of photodetectors above, picking up the chopped radiation reflected from the environment
[14:51] <Laurenceb_> i was thinking of optical mouse sensor for landing assist
[14:51] <Laurenceb_> on a glider
[14:52] <Hiena> 5-10 photodiode, bandpass filter, a lasepointer, a mirror and a motor.
[14:52] <Hiena> That could be enough for a all around proximity sensing with a 10 cm resolution.
[14:53] <Laurenceb_> heh yeah i have a 2 axis galvo mirror
[14:53] <Laurenceb_> keep meaning to make a scanner like that
[14:53] <Laurenceb_> if you have two photodiodes at different angles you can compensate for object reflectivity
[14:53] <Laurenceb_> and make a crude scanner - not sure how well itd work
[14:54] <Hiena> Used the siplified version for a net projectile.
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[14:56] <Hiena> Even with a 4 photodiode worked perfectly.
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[14:57] <SpeedEvil> Net projectile?
[14:59] <Hiena> Oversized nerfgun projectile fitted with 1 sqmeter fine net and 4 spring release. The proximity sensor released the spring and deployed the net.
[14:59] <SpeedEvil> ah
[15:00] <Hiena> Good to catch a stray dogs, cats or gipsies on the yard.
[15:00] <Laurenceb_> lol
[15:01] <SpeedEvil> I'm reminded of http://www.thecooljew.net/2009/01/spider-man-camel.html
[15:04] <Hiena> Setting the poximity around 3 meter scares the hell out of the average people, because they see a big bright red thing flying toward them, which suddenly "explode" and release a big green net. The fun thing it's never reach them because the deployed net brakes the projectile.
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[15:44] <cuddykid> erghh - I am getting voltage readings but no current readings
[15:58] <Laurenceb_> hmm kicad autoroute is actually good
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[16:00] <BrainDamage> I find it works good only on 2 layers boards
[16:00] <BrainDamage> on 1, it makes totally stupid decisions :/
[16:01] <Laurenceb_> heh
[16:02] <Laurenceb_> its better than eagle anyway
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[16:17] <cuddykid> any d
[16:17] <cuddykid> *any ideas why 0 amps is being displayed when the correct voltage is
[16:18] <daveake_> current too low / wiring wrong
[16:19] <cuddykid> hmm
[16:19] <daveake_> upload your circuit somewhere
[16:19] <cuddykid> will do :D
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[16:23] <cuddykid> uploading in 3,2,1...
[16:24] <cuddykid> ergh, hate the flickit app - hardly ever works
[16:27] <cuddykid> daveake_: http://flic.kr/p/bghVpa
[16:28] <zyp> I have one of those
[16:28] <cuddykid> zyp: do you have it working?
[16:29] <zyp> yes
[16:29] <cuddykid> all I want to do is p
[16:29] <cuddykid> *measure power from a fricken solar panel lol
[16:29] <daveake_> I was kinda hoping for a schematic not a nest of white wires on top of a white breadboard!
[16:29] <cuddykid> daveake_: I know, sorry :P
[16:29] <SpeedEvil> cuddykid: short the panel
[16:29] <zyp> well, P = U * I, so you have to calculate those first
[16:30] <zyp> anyway, what have you hooked the signals to?
[16:30] <cuddykid> yep, but can't get current reading at all
[16:30] <cuddykid> arduino
[16:30] <zyp> tried measuring the voltage of the I signal with a multimeter?
[16:30] <cuddykid> analogue pins - voltage is working fine, current isn't reading anything
[16:30] <cuddykid> zyp: left my multimeter at uni :(
[16:30] <zyp> remember that it's scaled for 45A at 3.3V or so
[16:30] <cuddykid> will try with a different arduino analogue pin
[16:31] <zyp> how much current are you drawing through it?
[16:31] <daveake_> I;m guessing that the little board just has a resistor on it, and you're trying to measure the voltaghe across that to determine the current through it?
[16:31] <zyp> what's your ADC resolution?
[16:32] <cuddykid> nothing at all
[16:32] <zyp> daveake_, the little board have both a shunt resistor and an opamp to amplify the voltage drop
[16:32] <zyp> cuddykid, huh?
[16:33] <cuddykid> zyp: I meant no raw reading what so ever from other pin (current)
[16:33] <daveake_> Ta. So how many volts per mA does that give?
[16:33] <cuddykid> just 0
[16:33] <zyp> daveake_, numbers are in the datasheet, I don't remember from the top of my head
[16:33] <daveake_> zpy was asking how what the smallest mV the ADC will register
[16:33] <zyp> but it's scaled to give around 45A at 3.3V
[16:33] <daveake_> zyp even :)
[16:33] <cuddykid> 73.20mV / Amp
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[16:34] <cuddykid> ahh, that might be why
[16:34] <daveake_> Right, so that's not very much. So cuddykid what Vref is the Arduino ADC using?
[16:34] <daveake_> And how many amps do you think you're generating?
[16:34] <cuddykid> daveake_: 5v is max I think
[16:35] <cuddykid> daveake_: I'm guessing tiny tiny amount of mA because I'm only holding this thing up to a lamp - will check the datasheet
[16:35] <zyp> but what load do you have on it?
[16:35] <daveake_> That's fine if you're expecting 3V3 max. But you can change and use an internal Vref (1.1V on the 3V3 Arduino Mini Pro - dunno about others). Doing so gives you more resolution.
[16:35] <zyp> do you have any load?
[16:35] <cuddykid> zyp: using 100ohm - best power is 150ohm
[16:36] <cuddykid> solar panel - usual is around 8volts at 44mA (in good sun)
[16:36] <daveake_> So nowhere near 45A then
[16:36] <cuddykid> yup :(
[16:36] <cuddykid> that will be la problemo
[16:36] <daveake_> Yep
[16:37] <zyp> then it's not really suited for this
[16:37] <cuddykid> hmmm
[16:37] <SpeedEvil> cuddykid: is this with a shunt resistor?
[16:37] <zyp> SpeedEvil, it is
[16:37] <zyp> shunt resistor and opamp
[16:37] <SpeedEvil> Replace the shunt with one a thousand times as large
[16:37] <cuddykid> yeah
[16:37] <SpeedEvil> Or up the gain by a thousandfold - if the offset of the opamp is low enough
[16:37] <zyp> or replace the gain resistor of the amplifier
[16:37] <daveake_> If 45A gives 3V3 then you can't get more than 3.3mV.
[16:38] <cuddykid> eek - will never ever be able to solder something so tiny
[16:38] <daveake_> To keep the maths simple, if your ADC ref is 5V then you need 10 bits of ADC resolution to even get 1 bit from 3.3mV
[16:38] <cuddykid> yeah
[16:39] <daveake_> So that's why you got zero
[16:39] <cuddykid> well, the main reason why I used this board was because it scales everything down (for voltage) - if I was to pop my own pot divider on there was the risk that I would exceed 5V and fry the chip :S
[16:39] <daveake_> <daveake_> current too low / wiring wrong
[16:40] <cuddykid> lol :D
[16:41] <cuddykid> back to square one - jeez I never realised it would be so damn hard to measure these values! :P
[16:41] <daveake_> If all you want to do is measure the power from a solar cell, then all you need to do is put an ideal load across it, then measure the voltage. You can then calculate current and power from that. If the voltage is too high for the ADC then use a potential divider to reduce. Job done.
[16:41] <daveake_> The solar cell data sheet will give you some max voltage/current to expect
[16:42] <daveake_> What you got there is the wrong tool for the job.
[16:42] <cuddykid> daveake_: yeah, the problem was scaling down as I don't know the max voltage - as I'm guessing it will be higher than here on earth
[16:42] <daveake_> A bit
[16:42] <daveake_> Just measure here and double. It won't be anywhere near that.
[16:42] <SpeedEvil> At the top of the atmospheer is 1300W
[16:42] <cuddykid> right, thanks for the help :D I'll crack on with it another way
[16:43] <SpeedEvil> the commonly accepted figure is 1000W/m^2 at ground level
[16:43] <Laurenceb_> big pole
[16:43] <daveake_> Voltage from the cell won't go up enormously
[16:43] <cuddykid> you're right, silly me
[16:43] <SpeedEvil> OCV will go up by 10% per decade of current-rise
[16:43] <SpeedEvil> (or so)
[16:43] <SpeedEvil> It's a diode
[16:43] <daveake_> To be clever you could adjust the load resistance (e.g. by switching in different resistors) and measure each
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[16:44] <daveake_> SpeedEvil yep
[16:44] <cuddykid> the "best" load is 150ohm but then I guess resistance will vary with temp?
[16:45] <daveake_> resistance of what? Resistor won't change. Internal resistance of the cell will but I don't know how much.
[16:46] <daveake_> anyway, need to go.
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[17:02] <Laurenceb_> http://www.adafruit.com/products/640
[17:02] <Laurenceb_> could be useful for cutdowns
[17:04] <NigeyS> oo
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[17:52] <cuddykid> still contemplating how I'm going to implement the cutdown
[17:57] <BrainDamage> let's see, chemical etching, stimulated nuclear decay, high gravitational field spaghettification, xray heating
[17:58] <BrainDamage> shaped charges
[17:59] <BrainDamage> squirrels chewing on the cord
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[18:03] <cuddykid> lol
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[18:10] <navrac> anyone had a problem with a ds18b20+ having a th bit stuck on?
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[18:34] <cuddykid> question for those with the keychain cams: is your battery rubbish? It seems to be about a day after charging it (with no use) it's dead :S
[18:35] <Dan-K2VOL> hmm haven't run it on the internal battery, we connected it to external
[18:35] <Dan-K2VOL> the whole cam is rubbish generally, practically impossible to automate
[18:35] <cuddykid> yeah - it's awful
[18:58] <NigeyS> mine only records audio..... lol
[19:04] <MrCraig> slight off topic - saw this centrifuge and thought the price looked good for anyone in need of one: http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=170766032723&fromMakeTrack=true&ssPageName=VIP:watchlink:top:en
[19:08] <SpeedEvil> I need a larger one.
[19:08] <SpeedEvil> http://xkcd.com/123/
[19:09] <MrCraig> aaaah perfect link to forward to a pedant friend of mine :)
[19:09] <SpeedEvil> http://www.ebay.co.uk/itm/BECKMAN-L8-70M-ROCK-CORE-CENTRIFUGE-ROTOR-/220932200435?pt=UK_BOI_Medical_Lab_Equipment_Lab_Equipment_ET&hash=item337095d7f3
[19:09] <SpeedEvil> They used to make ~4 miles from here.
[19:10] <MrCraig> whoh - that'd never fit in my kitchen
[19:10] <cuddykid> stupid stupid stupid keychain cam - hate the damn thing! I think I'll abandon it
[19:11] <fsphil> wonder how complicated it would be to replicate those little cameras
[19:11] <fsphil> only have serial interface
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[19:13] <cuddykid> whenever I try and solder wires to the power supply terminals the wires just come off - so annoying - mines a big blob of hot glue now :P
[19:18] <fsphil> tried some flux to clean the terminals?
[19:25] <SpeedEvil> Do you want to remove hot-glue?
[19:25] <SpeedEvil> Heat to ~80C or so, and then scrape off the gooey glue.
[19:25] <SpeedEvil> Now use a toothbrush and paint thinner
[19:25] <SpeedEvil> it comes right off, when warm
[19:25] <cuddykid> fsphil: never used flux but I have some now, might try that tomorrow
[19:26] <cuddykid> I think I'm just going to abandon it all together though - I remember the video I took was awful quality
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[20:07] <Laurenceb_> https://github.com/raspberrypi
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[20:21] <Laurenceb_> https://github.com/raspberrypi/linux/blob/rpi-patches/arch/arm/mach-bcm2708/bcm2708_gpio.c
[20:21] <Laurenceb_> looks like bit banged gpio only
[20:21] <Laurenceb_> but they support exti
[20:24] <Laurenceb_> https://github.com/raspberrypi/linux/blob/rpi-patches/arch/arm/mach-bcm2708/include/mach/platform.h
[20:24] <Laurenceb_> hmmm
[20:26] <Laurenceb_> dma is documented and has helped functions too.. not sure how youd use dma from userland?
[20:27] <Laurenceb_> you need a custom driver?
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[20:30] <SpeedEvil> yes
[20:30] <Laurenceb_> looks like USART, watchdog, exti, gpio, dma are usable (along with the obvious stuff like usb etc)
[20:30] <SpeedEvil> you need to write a kernel module
[20:31] <Laurenceb_> i see
[20:31] <SpeedEvil> If you want to use DMA from userspace
[20:31] <Laurenceb_> i think i see all the timer documentation in there maybe
[20:31] <SpeedEvil> Well - asusuming what you want to used oes not have a driver
[20:31] <SpeedEvil> you want to get the GPIO DMA capable?
[20:31] <Laurenceb_> looks like its just missing spi and i2c hardware
[20:31] <Laurenceb_> maybe
[20:32] <Laurenceb_> the register base locations are in there, but it seems they are just using the stock bitbanged drivers from main kernel branch
[20:32] <SpeedEvil> aj
[20:32] <SpeedEvil> ah
[20:33] <Laurenceb_> but yeah it looks impressive
[20:33] <Laurenceb_> looks like itd even be possible to use it as an arm dev board
[20:33] <Laurenceb_> i was thinking theyd be using binary blobs, but looks like that'll just be for the opengl right?
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[20:34] <Laurenceb_> https://github.com/raspberrypi/linux/blob/rpi-patches/arch/arm/mach-bcm2708/bcm2708.c
[20:34] <Laurenceb_> .uartclk = 125000000, <-fast :P
[20:35] <Laurenceb_> hmm it might be capable of running real time kernel with some imu sensors
[20:37] <SpeedEvil> But can it run ubuntu at the same time?
[20:37] <SpeedEvil> And firefox.
[20:38] <SpeedEvil> :)
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[21:01] <Lunar_Lander> hello
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[21:24] <Lunar_Lander> hello andrew_apex
[21:25] <andrew_apex> evening Lunar_Lander
[21:25] <Lunar_Lander> how are you?
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[21:30] <andrew_apex> well thanks :)
[21:31] <Lunar_Lander> that is good to hear,I'm fine too
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[21:33] <nosebleedkt_> bye punks !
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[21:34] <Lunar_Lander> andrew_apex_ I hope I can get that laptop with the drivers back on monday
[21:34] <Lunar_Lander> then I can test the GPS
[21:34] <andrew_apex_> Lunar_Lander: what are the drivers for? a serial port?
[21:34] <Lunar_Lander> yes for the FTDI UART
[21:35] <andrew_apex_> sounds good :)
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[21:35] Nick change: andrew_apex_ -> andrew_apex
[21:36] <Lunar_Lander> yes
[21:37] <Lunar_Lander> it's that FT232 board by sparkfun that I use
[21:38] <navrac> my machine already had the drivers built in - or didnt need any
[21:40] <Lunar_Lander> yes
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[21:49] <DrLuke> Well, I am currently working on a small breakout board for an atmega32u2 with usb capability: http://i.imgur.com/wb6i9.png
[21:50] <DrLuke> it would allow me to use serial over usb
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[22:06] <Lunar_Lander> cuddykid: are you at the PC?
[22:07] <Laurenceb_> http://uk.mouser.com/ProductDetail/Kionix/KXR94-2353/?qs=sGAEpiMZZMuP%2fQeRSdvksD6n9OtmIAIe
[22:08] <Lunar_Lander> cuddykid: if you read this: I wanted to ask if you figured out why the external temperature sensor on HABE-1 malfunctioned?
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[23:00] <Lunar_Lander> hello daveake_
[23:01] <daveake_> evening
[23:05] <Lunar_Lander> how are you today?
[23:06] <daveake_> Fine ... payload done and dusted, just waiting till I can run some predictions
[23:07] <Lunar_Lander> yea
[23:07] <Lunar_Lander> the film was nice so far
[23:07] <Lunar_Lander> I liked the music at the end of Part 4
[23:08] <daveake_> Yeah, Andrew composed the music himself
[23:08] <daveake_> Dunno if he composed all of it or not, but certainly some of it. I'll ask him.
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[23:08] <Lunar_Lander> yeah
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[23:21] <natrium42> hi Lunar_Lander
[23:21] <daveake_> Prediction for next Saturday has a very wet ending, so it's looking doubtful for a launch on Sunday
[23:21] <Lunar_Lander> yea
[23:21] <Lunar_Lander> hi natrium42, how are you?
[23:21] <natrium42> god, and you?
[23:22] <Lunar_Lander> I'm also good, thanks
[23:22] <daveake_> god, eh? Can you fix the winds for me?
[23:22] <natrium42> XD
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[00:00] --- Sun Jan 22 2012