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[09:28] icez (~icez@unaffiliated/icez) left irc: Remote host closed the connection [09:31] earthshine (~mmcrobert@bb-87-80-136-184.ukonline.co.uk) left irc: Quit: Lost terminal [09:48] mmcrober4s1 (~mmcrobert@bb-87-80-136-184.ukonline.co.uk) joined #highaltitude. [09:49] Simon-MPFH (~simon@phantom.mpfh.co.uk) left irc: Quit: Leaving [09:51] mmcrober4s1 (mmcrobert@bb-87-80-136-184.ukonline.co.uk) left #highaltitude. [09:55] earthshine (~mmcrobert@bb-87-80-136-184.ukonline.co.uk) joined #highaltitude. [09:55] hello [10:02] Laurenceb (~laurence@host81-154-84-43.range81-154.btcentralplus.com) joined #highaltitude. [10:02] d [10:03] rjharrison_mac (~rharrison@62.49.185.11) left irc: Quit: This computer has gone to sleep [10:05] e [10:08] Nick change: jonsowma1 -> jonsowman [10:16] f [10:22] lol [10:25] cool [10:27] just setting up ssh, screen and irssi [10:27] works cool in Android over connectbot [10:28] earthshine: yup works pretty well :) [10:28] :) [10:28] i'm running irssi on my server and then just connect from whatever i'm using [10:29] the iphone ssh client is pretty neat [10:29] connectbot is apparently very good too, though i dont own an android phone [10:30] yeah it works really well [10:30] hmm wx not looking good for launch at the moment :( [10:30] :( [10:31] WHen were you hoping to launch? [10:31] not me personally [10:31] oh [10:31] i just know there are a couple of launches waiting to happen [10:31] yeah [10:31] which reminds me i must fix my radio [10:32] what happened to it? [10:32] it died at Scotts launch [10:32] I might have connected a wrongly polarised cable to it - so it should just be a fuse [10:32] oh right ok, hmm yes i remember you saying [10:33] yeah [10:36] hey jonsowman [10:36] saw you on hackaday today :) [10:36] really? [10:36] juxta: :) [10:36] http://hackaday.com/2010/03/17/arduino-balloon-tracking/ [10:36] earthshine: that tracker Randomskk and I put together for scott's launch [10:37] was very hacky, and took less than a day [10:37] looks like you went all out with materials ;p [10:37] juxta: oh yes [10:37] drinking straw antenna [10:37] cool [10:39] i didn't realise you'd used an actual Arduino [10:39] I thought you just had an Atmega chip on a PCB [10:39] and just 4 AA batteries powered the Arduino and GPS? [10:39] earthshine: it was quicker to use the arduino, and time was our main problem [10:39] they were Energiser Lithiums [10:40] but yes they powered it fine [10:40] i'm surprised [10:40] jonsowman: I used drinking straws onmy last payload too :) [10:40] juxta: looks a bit silly but it works perfectly well [10:40] yeah I'm a bit surpirsed re the 4 aa's actually - I didnt think the 5v reg on the arduino was low-dropout [10:41] how long did the transmitter run for ? [10:41] we powered it up about 30 mins before launch [10:41] and we asked someone to power it down about 1hr after landing [10:41] so i'm guessing 4 hours? maybe 4.5 [10:41] it would have gone for much longer [10:42] impressive [10:42] those batteries are ~3Ah [10:42] i tested my first payload (very similar, a bit more power consumption given that my TX was 25mw rather than 10mw) & got over 12 hours [10:42] juxta: wow thats pretty good [10:43] theyre quite expensive though [10:43] but I used an external LDO reg, because the specs for the arduino's regulator stipulate it should have a dropout of 1.5v :P [10:43] hmm, about $10AUD for a 4 pack on ebay here [10:43] which is probably about 4 pound [10:44] hmm yes if we'd have done it properly we would have used a seperate LDO reg [10:44] I paid about ВЈ6.50 in sainsburys [10:44] but i needed them that day, so i didnt search for cheaper [10:45] I was thinking of using a 5v boost convertor such as a MAX756 for mine [10:45] yeah I thought about going that way too [10:45] thne only using say 2 batteries [10:46] yeah [10:46] but then you need more components, plus you need the power to be noise free [10:46] and a bit of heat from the reg is a good thing :D [10:46] hmm yes might be interesting to play with [10:46] 3v boosted to say 6v and then linear reg'd to 5v? [10:46] haha [10:47] thats an option too i guess [10:47] only use two batteries, nice clean power, and a bit of heat [10:47] you can boost it to 5.5v [10:47] yeh [10:47] then an LDO to 5V [10:47] yup [10:47] they do generate a bit of heat themselves as they are not 100% efficient [10:48] yup [10:48] hmm i might try that [10:48] The LT1302 can give out 12v too [10:48] 5v 600mA - 12v 120mA [10:48] i cant see it being significantly more inefficient than say 6V + LDO to 5V [10:49] obviously it will be slightly, but that only goes to heat [10:49] yes they are pretty efficient - around 90% [10:49] hmm [10:49] interesting [10:49] check out 'mintyboost' [10:50] on LadyAda's webite - there are full schematics [10:50] it is desoigned for charging an iPod from 2 cells but it could be used for anything [10:50] it genereates 5v from 2 AA's [10:50] sorry for bad spelling this morning i'm still half asleep [10:51] hmm thats exactly what we want [10:51] worth investigating [10:52] yep [10:52] i've made one before for powering an Intervalometer with LCD screen from 2 AA's [10:52] using the LT1302 [10:53] worked really well [10:57] you could even use a Alterantively - something like this - http://cgi.ebay.co.uk/12V-Rechargeable-Li-ion-battery-For-CCTV-Camera-4800mAh_W0QQitemZ270441270580QQcmdZViewItemQQptZUK_ConsumerElectronics_Batteries_SM?hash=item3ef78e4d34 [10:58] mm yeh [10:58] or this - http://tinyurl.com/ydfbphp [10:58] 9800mAh [10:59] yeh thats pretty good [10:59] would run for days lol [10:59] yup [10:59] nice anad light too [11:01] mm [11:01] im definitely going to give the 3v -> 5.5v -> 5v thing [11:01] might prototype a mintyboost [11:03] cool [11:05] jon - i'm on my iMac now - but if I want to log in from my phone into this screen session do I need to detch it first ? [11:05] *detach [11:07] nope [11:07] multiple connections to screen sessions are fine [11:08] do i need to set anything to enable that though or will it do it anyway ? [11:08] nope should be fine by default [11:08] is it not working? [11:09] haven't tried it [11:09] ok yup should be fine I think [11:09] obviously both connections will be to the same screen session so when you type on your phone, you'll see it appear on your iMac [11:11] "there is no screen to be resumed" [11:11] "screen -ls" [11:11] does that return "no sockets..." [11:12] yes [11:12] no [11:12] 2 sockets.... [11:12] ah, you've got two screen sessions running [11:12] hmm [11:12] "screen -r " lets you reattach to a chosen one [11:13] and close the one you dont need with "ctrl-a k" [11:13] then "screen -x" will work and attach to the one remaining session [11:17] earthshine (~mmcrobert@bb-87-80-136-184.ukonline.co.uk) left irc: Ping timeout: 240 seconds [11:17] hmm... that went well then [11:27] earthshine (~mmcrobert@bb-87-80-136-184.ukonline.co.uk) joined #highaltitude. [11:27] hmm [11:29] get anywhere? [11:29] i assume irssi is running on your iMac? [11:29] Aha [11:29] fixed [11:30] :) what was it? [11:30] now talking from phone [11:30] and now talking from iMac [11:30] wahey [11:30] good good :) [11:30] screen is pretty awesome huh? [11:30] :) [11:30] I was adding the bit after the last . when trying to connect [11:30] ah right [11:30] i.e. the iMac's ID - i needed to leave that bit out [11:30] yeh [11:31] fair enough:) [11:31] cool [11:32] great [11:32] thx for your help [11:33] no worries :) [11:39] right bbl [11:42] bye [11:54] test [12:41] Laurenceb (~laurence@host81-154-84-43.range81-154.btcentralplus.com) left irc: Ping timeout: 240 seconds [14:34] edmoore (~ed@chu-gw-a.churchillcambridge.co.uk) joined #highaltitude. [14:35] hi ed [14:35] hi mike [14:36] how's it going? [14:38] ok thanks [14:38] My digital bench PSU arrived today [14:38] ready for me working on the payload next week [14:39] digital! ;) [14:39] awesome. they're a very useful thing to have [14:39] we have an analogue one in our lab. silly really, i have a digital one at home, and I am never at home [14:40] jcoxon (~jcoxon@92.40.50.121.sub.mbb.three.co.uk) joined #highaltitude. [14:40] yeah - it's nice. 0-30v and 0-5amps [14:40] we got some of those from Rapid [14:40] Sold my first FSA03 to jon too [14:40] cheap too [14:41] http://www.rapidonline.com/Electrical-Power/Power-Supplies/Bench-PSUs/100W-Switch-mode-bench-PSU/78617/kw/bench+power+supply [14:41] (actually they were discounted more than that when we bought them) [14:41] mine was cheaper than that [14:41] yeah heh [14:42] http://cpc.farnell.com/_/in05524/power-supply-bench-led-30v-3a/dp/IN0552405?Ntt=IN0552405 [14:43] DoYouKnow (~c0cb88fe@gateway/web/freenode/x-lpgtgmdshyqmmtso) joined #highaltitude. [14:43] yeah I got the 20v/5A ones for Ј40+VAT each [14:44] bargain I say [14:44] cool [14:47] juxta (fourtytwo@ppp118-210-24-33.lns20.adl2.internode.on.net) left irc: Ping timeout: 264 seconds [14:51] _sh3 (debian-tor@gateway/tor-sasl/sh3/x-62271040) left irc: Ping timeout: 245 seconds [14:58] earthshine, do you think the fsa03 needs a breakout board or do you think soldering wires directly would be fine? [14:58] It is designed to solder flat onto a PCB [14:59] For testing purpose you could solder some headers onto it [14:59] is is 0.1"? [15:00] Simon-MPFH (~simon@phantom.mpfh.co.uk) joined #highaltitude. [15:00] 3mm [15:00] so yes [15:00] but.... [15:00] 4.7mm for the 3 on the end [15:01] http://www.falcom.de/uploads/media/AppNote_FSA03_rev_1.0.2.pdf [15:03] thanks [15:04] a breakoutboard wopuld be ideal though - especially for testing [15:04] we'll have to design one [15:06] _sh3 (debian-tor@gateway/tor-sasl/sh3/x-62271040) joined #highaltitude. [15:07] is there an eagle package for it floating about? [15:08] i have an eagle library for the pin pads [15:09] is it downloadable? [15:09] i can email it to you [15:10] that'd be grand [15:10] edmoore, going onto badger? [15:10] probs not [15:10] we osten use external antennas [15:11] often* [15:11] but might go on badger cub and some other smaller things [15:11] :-) [15:12] the badgers are taking on a bit of a rocket focus atm as we seem to be mainly rockets rather than balloons for the next few months. [15:12] DoYouKnow (~c0cb88fe@gateway/web/freenode/x-lpgtgmdshyqmmtso) left irc: Quit: Page closed [15:12] cool cool [15:13] going to swap my the lassen on BH5 for the fsa03 [15:13] back to my beloved ubloxes [15:13] they are so very much better [15:18] ed i've sent the file to you [15:19] hope you get it OK [15:20] not yet but will assume it's taking a scenic route around the intertubes [15:25] got it [15:25] ta [15:26] your temp probe looks good. might get us a few of those. [15:27] edmoore, started a faq section on hte wiki [15:27] coolio [15:27] though haven't really got round to writing it up - some of your standard answers would be useful if you have them lying around [15:27] we can become a proper irc channel [15:27] yeah they are nice. Good way to package the DS18B20's [15:27] 'read the wiki first. don;t ask to ask, just ask' [15:28] earthshine: yeah. what's the mass, do you know? [15:30] 16g [15:34] Do things hot glued to the side of payloads stay on? i.e. does the glue fail at -55c ? [15:36] earthshine, hot glue seems to be good [15:36] I'd be inclined not to trust it for anything load bearing though [15:36] it's to attach a small and light science payload to the side [15:36] maybe just gluing sheets of polystyrene together [15:36] i'd have a backup [15:37] cable ties or something [15:37] although those two should definitely not be load-bearing! [15:37] k [15:37] too* [15:40] so glue + duct tape + cable ties + string should be fine [15:48] Jasperw (~jasperw@client-81-100-30-42.cht-bng-015.adsl.virginmedia.net) joined #highaltitude. [16:09] sbasuita (~sbasuita@unaffiliated/drebellion) joined #highaltitude. [16:10] jasonb (~jasonb@m2c0e36d0.tmodns.net) joined #highaltitude. [16:32] Simon-MPFH (~simon@phantom.mpfh.co.uk) left irc: Quit: Leaving [16:33] rjharrison_mac (~rharrison@62.49.185.11) joined #highaltitude. [16:36] jasonb (~jasonb@m2c0e36d0.tmodns.net) left irc: Ping timeout: 252 seconds [16:43] hey [16:44] edmoore (~ed@chu-gw-a.churchillcambridge.co.uk) left irc: Quit: edmoore [16:47] jcoxon (~jcoxon@92.40.50.121.sub.mbb.three.co.uk) left irc: Quit: Leaving [16:47] Simon-MPFH (~simon@phantom.mpfh.co.uk) joined #highaltitude. [16:53] hey [16:54] Simon-MPFH (~simon@phantom.mpfh.co.uk) left irc: Quit: Leaving [17:05] hi earthshine [17:10] Jasperw (~jasperw@client-81-100-30-42.cht-bng-015.adsl.virginmedia.net) left irc: Ping timeout: 265 seconds [17:15] Enceladus (~Brian@host86-155-6-161.range86-155.btcentralplus.com) joined #highaltitude. [17:17] rjharrison_mac (~rharrison@62.49.185.11) left irc: Quit: This computer has gone to sleep [17:20] DanielRichman (~DanielRic@unaffiliated/danielrichman) joined #highaltitude. [17:25] Jasperw (~jasperw@client-86-25-212-88.cht-bng-015.adsl.virginmedia.net) joined #highaltitude. [17:25] natrium42 (~8161a9d7@gateway/web/freenode/x-eggxtyxkcngguaow) joined #highaltitude. [17:31] Ping natrium42 [17:31] ohai [17:31] pm [17:31] sure [17:31] if webchat supports it :) [17:32] natrium42 does it work? [17:37] natrium42 (~8161a9d7@gateway/web/freenode/x-eggxtyxkcngguaow) left irc: Ping timeout: 252 seconds [17:38] crap [17:39] natrium42 (~8161a9d7@gateway/web/freenode/x-aqlxpxulafmsjldg) joined #highaltitude. [17:39] rjharrison: something happened to webchat [17:39] but pm was working [17:59] bbl [17:59] rjharrison (~rharrison@62.49.185.11) left irc: [18:13] icez (~icez@unaffiliated/icez) joined #highaltitude. [18:14] gamers600 (~gamers600@ip68-99-230-95.ph.ph.cox.net) joined #highaltitude. [18:22] natrium42 (~8161a9d7@gateway/web/freenode/x-aqlxpxulafmsjldg) left irc: Quit: Page closed [18:25] jcoxon (~jcoxon@80.176.120.90) joined #highaltitude. [18:29] evening all [18:43] yay [18:43] returned the shitty kodak for a refund and bought a brother inkjet scanner [18:43] brother actually make linux drivers so now I can print and scan all day [18:43] plus this printer was cheaper but has builtin ethernet and wifi [18:55] fsphil (~phil@2001:470:1f09:483:21f:c6ff:fe44:b25b) joined #highaltitude. [19:20] F4EIR (~5c8d790a@gateway/web/freenode/x-prbwnwxqzxnlbprv) joined #highaltitude. [19:21] hello all [19:21] hi [19:22] hiya F4EIR [19:22] Simon-MPFH (~simon@phantom.mpfh.co.uk) joined #highaltitude. [19:23] is there a scheduled next event ? [19:23] not that I know of, weather is currently very very bad [19:25] laurenceb: http://tech.slashdot.org/story/10/03/18/1739249/3-D-Printer-Creates-Buildings-From-Dust-and-Glue [19:26] yes maybe the come of spring will change that [19:26] it should patch up soon enough [19:26] right now it's just all over the channel though, terrible [19:26] if you released a balloon now from Cambridge, where would it end up? [19:26] http://www.srcf.ucam.org/~cuspaceflight/hourly-predictions/ [19:27] in the sea between here and the netherlands [19:27] each of those red dots is the result of a sim run for a release hourly for the next week [19:27] the end of the week sees it coming back over norwich so it seems to be picking up a bit [19:27] aaah now I understand what that map's saying [19:32] heh, a month at sea really doesn't help pcb's much: http://www.flickr.com/photos/cuspaceflight/3863616068/ [19:32] was the SD card still in it? [19:33] Jasperw (~jasperw@client-86-25-212-88.cht-bng-015.adsl.virginmedia.net) left irc: Quit: Leaving. [19:35] fsphil: have to ask edmoore when he pops in [19:35] ah, so that's his creation [19:35] well he was around at that point [19:38] did you have a part of the wiki explane how landing prediction work ? i have tried to clic on map but wrong way [19:38] it should mostly be a case of www.cuspaceflight.co.uk/predict and enter your details then it should show the flight path on the map [19:38] g0mjw (~chatzilla@213-152-32-108.dsl.eclipse.net.uk) left irc: Ping timeout: 276 seconds [19:41] DanielRichman, hourly predictions are looking up :) [19:42] sbasuita: for the end of the week maybe [19:42] sbasuita, :O [19:42] still got a while to go before we hit properly dry land [19:42] yes [19:46] Randomskk: thank you [19:57] LazyLeopard (~irc-clien@chocky.demon.co.uk) joined #highaltitude. [20:01] Is it feasible to put a bright light on a balloon and see it at 35k at night? [20:02] with clear skies maybe but everyone would see it... [20:02] Randomskk, ufo? [20:02] could have it do morse code as an easter egg ;P [20:03] 'we come in peace' 'take me to your leader' xd [20:03] uplink to enable/disable light [20:03] no [20:03] sbasuita, yes [20:03] sbasuita, but :) @ "we come in peace"... [20:05] "resistance is futile" [20:05] it would need to be a pretty bright light [20:06] the question is just how bright [20:06] does ofcom regulate transmissions on visible light? [20:06] DanielRichman, we already have a shitload of light pollution [20:06] DanielRichman, i'm sure nobody cares [20:06] also don't the laws that cover laserpenning down helicoptors apply to sticking random bright lights in the sky? [20:06] DanielRichman, it's not going to bright enough to blind pilots [20:06] I know that; that's not the point [20:07] 1) Hold your nose 2) Hum 3) ??? 4) D; [20:08] sheesh, you wouldn't believe the wind here atm. [20:10] sbasuita: very [20:10] SpeedEvil, is it feasible? [20:10] sbasuita: A star - an easily visible one - is 0.9nW/m^2 at the ground [20:11] sbasuita: to cover a patch 31*31km [20:11] sbasuita: is 1W of visible light [20:11] sbasuita: this is about 5W from decent LEDs [20:12] edmoore (~836f0142@gateway/web/freenode/x-iwbijejedvwplbsl) joined #highaltitude. [20:12] evening all [20:12] yo edmoore [20:13] SpeedEvil, sorry, i don't follow :/ [20:14] Enceladus: how's the learning curve going? [20:14] If you go down to a patch 1km*1km, you take it to magnitude -1, which is _very_ bright. [20:14] http://stjarnhimlen.se/comp/radfaq.html [20:14] sbasuita: where did I lose you? [20:15] SpeedEvil, "this is about 5W from decent LEDs" ? [20:15] sbasuita: ah. 5W input power - electrical [20:15] SpeedEvil, yeah but i don't get what this relates to [20:15] oh right [20:15] are led's only 20% efficient? [20:15] yeah the efficienty [20:15] i see [20:15] fsphil: yes - the good ones - about that [20:16] fsphil: well - blue are ~50% - but due to the inefficiency of the eye - look dimmer [20:16] sbasuita, where are going to get 5W from!? We'll have to strobe it or something [20:16] flashing it would make it easier to see [20:16] DanielRichman, yeah flashing is easier to spot anyway [20:16] flash morse; let'sgo [20:16] yes - I was assuming something like .1s on, 10s off [20:17] that takes you down to ~50mW [20:17] then uplink to activate sending of morse message! [20:17] DanielRichman, no uplink! [20:17] whyyy! [20:17] we could have three colours @_@ [20:17] do a rave thing you know [20:17] sbasuita, you're toying with dangerous forces here [20:18] can we convert the ievan polkka into morse? [20:18] >_> [20:18] we could morse a tinyurl [20:18] ok cool this is definitely something we should do for alien2 [20:18] with a telescope on the ground, you'd probably be able to encode a fair bit of data into the light [20:18] keeping the telescope steady will be fun [20:19] speaking of telescopes, sbasuita, did the physics department get their grant? [20:19] DanielRichman, i hope not [20:19] :P [20:19] DanielRichman, also i think the games department are putting together a proposal for a sports hall instead of greenhouse [20:20] sbasuita, er... [20:20] sbasuita, isn't it a bit late for that? [20:20] DanielRichman, god knows [20:20] sbasuita, also remember that Weeds is Der Fuhrer, he'll tell them to get lost [20:21] Laurenceb (~laurence@host81-154-84-43.range81-154.btcentralplus.com) joined #highaltitude. [20:23] aww lucid beta 1 postponed till tomorrow :( [20:23] sbasuita, you wern't going to download it anyway... were you? [20:23] sbasuita, also is lucid the one where they're going to pimp the boot time? [20:24] DanielRichman, ye i was [20:25] I wonder how fast it will become [20:25] DanielRichman, ubuntu have been pimping the boot time for ages [20:25] DanielRichman, 10 sec target on the dell mini iirc [20:25] good [20:25] DanielRichman, that might actually be to desktop with autologin [20:25] So.... anyone got any good ideas for (thinking ahead) alien flight [20:25] * [20:25] #2 [20:25] (every time I went to press the hash key... -.-_ [20:26] (they don't have to be practical) (not including sstv, visible light ufo/rave, downwards facing camera, night launch, ionizing radiation measurements [20:30] IR camera .. cut through the haze, sharper images of the limb maybe? [20:30] just do a first flight asap. It's a bit like software - just release something, even if it's a bit crappy. then get onto the development treadmill [20:32] that's what i keep saying! [20:32] ooh, found a neat page for figuring out AVR fuses: http://www.engbedded.com/fusecalc/ [20:33] edmoore, yeah but we've gotta submit a document applying for moneyz from the "old redigensians" soon; so want some defined goals on "what we'll do" with the cash [20:33] they sound hard to please [20:33] Coke and hookers. [20:38] camera and atmega are now talking .. now to get it taking pictures [20:39] g0mjw (~chatzilla@213-152-32-108.dsl.eclipse.net.uk) joined #highaltitude. [20:40] on the topic of optical ufo/rave, and interesting resource is http://modulatedlight.org/optical_comms/optical_index.html . people have gotten over a 100km range with freespace optical communication using LEDs. sticking the transmitter in a balloon might make line of sight easier. [20:41] though, that is with directional lenses, which might not be practice for something swinging from a balloon.. [20:41] Action: kleinjt_ returns to lurking [20:42] with a modest scope, and a filter, should be quite possible [20:42] especially with a blue LED and filter [20:43] would it work in daylight though? [20:45] yes [20:45] SNR will drop [20:46] that would be a really interesting experiment [20:47] would need a fairly good supply of power though [20:48] you needs a laser [20:48] otherwise you're just heading up the RF spectrum with all it's associated free-space path loses as the square of frequency. [20:49] but a laser is like having a dish of infinite diameter - really quite exciting [20:52] the laser could be aimed with a small tiltable mirror [20:53] still, will be very difficult to keep it on target [20:54] you'd get in trouble too [20:54] aiming lasers into the sky is a bit frowned upon [20:54] what if it was an IR laser? does such a thing exist? [20:54] yes [20:55] laser cutters use them [20:55] you could use it as a cutdown [20:55] well, I'm not talking quite those power levels :) [20:55] a few milliwatts would do [20:56] to tx up to a balloon from the ground I would have thought a 20W tube would be about right [20:57] that's quite a bit for a laser [20:57] you've got a lot of air to get through [20:57] g0mjw (~chatzilla@213-152-32-108.dsl.eclipse.net.uk) left irc: Ping timeout: 246 seconds [20:57] true [20:58] and the diffraction would cause all sorts of problems [20:59] methinks lower frequencies are better suited for this sort of thing [20:59]