highaltitude.log.20110112

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[08:04] <griffonbot> Received email: James Coxon <jacoxon@gmail.com> "Re: Guidance for a 'Code' Virgin"
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[09:01] <mc-> is Speedevil about?
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[09:05] <SpeedEvil> no
[09:05] <SpeedEvil> I dunno.
[09:07] <mc-> just sent you an email
[09:07] <mc-> hopefully I had the right address
[09:09] <SpeedEvil> yes
[09:09] <SpeedEvil> will read later, thansk
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[09:09] <SpeedEvil> going back to sleep
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[11:33] <m1x10> ping fsphil
[11:33] <m1x10> fsphil: u r awesome! I liked the message in the crystals :) :) :)
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[12:10] <griffonbot> Received email: "aiqy65@googlemail.com" <aiqy65@googlemail.com> "Remote Payload release"
[12:18] <griffonbot> Received email: "Matthew Beddow" <matt.beddow@gmail.com> "RE: Remote Payload release"
[12:36] <griffonbot> Received email: Adam Greig <random@randomskk.net> "Re: Remote Payload release"
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[13:01] Nick change: SpeedEvil1 -> F--KngInternet
[13:01] Nick change: F--KngInternet -> SpeedEvil
[13:03] <fsphil> glad they arrived safely m1x10 :)
[13:03] <fsphil> are they working?
[13:08] Action: Laurenceb has linux running on the df3120
[13:20] <fsphil> what evil plans do you have for that?
[13:20] <SpeedEvil> Congrats. You got your toolchain working?
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[13:26] <m1x10> fsphil: hi !
[13:26] <m1x10> Im just going to run them
[13:27] <m1x10> caps 20pf?
[13:27] <m1x10> *22
[13:30] <fsphil> yea that seems to work well
[13:31] <fsphil> though on breadboard I didn't use any caps
[13:31] <SpeedEvil> breadboard has 11pf caps between every line
[13:33] <fsphil> that explains that
[13:33] <Laurenceb> yeah toolchain works now
[13:33] <Laurenceb> telnet not so much
[13:33] <Laurenceb> keep getting connection refused
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[13:55] <m1x10> fsphil: think its working
[13:55] <m1x10> at least I upload hex files through avrdude
[13:56] <fsphil> yep it's working
[13:57] <m1x10> but console outputs the gps messages like hell
[13:58] <m1x10> `0†ž?<<àž†žøž~<
[13:58] <m1x10> stuff like this
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[14:01] <DanielRichman> silly question: can Zener diodes still be used as if they are normal diodes when they're forward biased? i.e., to only allow current in one direction, provided the voltage is less than the breakdown voltage?
[14:01] <SpeedEvil> yes
[14:01] <DanielRichman> OK, thank you
[14:02] <SpeedEvil> they may be poor for other reasons in the forward direction - but if you need something noncritical - it's fine
[14:03] <fsphil> m1x10, did you remember to update F_CPU?
[14:04] <fsphil> and the baud rate of the uart
[14:05] <m1x10> whats the freq number?
[14:05] <m1x10> 73... ?
[14:05] <fsphil> it's written on the crystal
[14:06] <m1x10> ok
[14:06] <m1x10> 73728
[14:07] <fsphil> brb
[14:14] <Laurenceb> SpeedEvil: ive been running plasma for an hour or so now
[14:14] <Laurenceb> it does get slightly warm
[14:14] <SpeedEvil> :)
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[14:39] <m1x10> Ok, I did one big step forward!
[14:39] <m1x10> Im running a full 3v3 system :)
[14:43] <Laurenceb> heh load average 0.99
[14:44] <Laurenceb> screen isw the hottest bit
[14:44] <griffonbot> Received email: Anthony Stirk <upuaut@gmail.com> "Re: Remote Payload release"
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[15:16] <NigeyS> afternoon
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[15:52] <griffonbot> @jonsowman: Started work on integrating the burst calculator into the predictor #cusf [http://twitter.com/jonsowman/status/25218590135291905]
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[16:23] <m1x10> ping fsphil
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[16:57] <m1x10> the 22pf caps are wired to the ground?
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[17:14] <jcoxon> evening all
[17:14] <NigeyS> evening james
[17:16] <jcoxon> hey NigeyS
[17:16] <jcoxon> any progress wit the flight computer?
[17:16] <NigeyS> not yet will be doing most of what's left on the weekend
[17:17] <NigeyS> i did attatch and solder the gps stuff to the breakout though
[17:18] <jcoxon> if you power up the board it should flash the led
[17:19] <NigeyS> ah sweet, assuming the led works, the postman mustve threw the package through the letter box, the noise it made when it hit the tiled floor!
[17:25] <jcoxon> hehe
[17:25] <NigeyS> it's a lovely little pcb mind
[17:26] <jcoxon> could be a lot smaller
[17:26] <NigeyS> :o
[17:40] <griffonbot> Received email: Ed Moore <eam52@cam.ac.uk> "Re: Remote Payload release"
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[18:00] <griffonbot> Received email: Fergus Noble <fergusnoble@gmail.com> "Re: Remote Payload release"
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[18:15] <jcoxon> got the ntx2 working on PicoAtlas
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[18:29] <fsphil> looks like the winds might be calming down a bit for monday
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[18:46] <NigeyS> this rain needs to sod off as our roof has sprung a nasty leak!
[18:48] <Laurenceb_> oops
[18:49] <NigeyS> yeah big woops, had the roofers here earlier, not much they can do while the weather is so bad
[18:52] <fsphil> getting much of the wet stuff? been lucky here so far, which is unusual
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[19:00] <NigeyS> lots phil
[19:00] <NigeyS> they have flood warning for most of wales over the next 24 hours :(
[19:01] <Zuph> ping stilldavid
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[19:02] <stilldavid> hi Zuph !
[19:02] <stilldavid> about to run to lunch, what's up?
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[19:03] <Zuph> stilldavid: Just thought I'd let you know, we've declared the one balloon we've opened unsafe to fly until we've done further testing.
[19:03] <Zuph> stilldavid: We have plans to inspect the remaining balloons, and possibly do a leak test.
[19:03] <stilldavid> oh man. not sure how I feel about that...
[19:03] <stilldavid> it leaked?!
[19:03] <Zuph> stilldavid: Well, we inspected the seams of the balloon, and they appear as though they'd leak helium like a sieve.
[19:03] <stilldavid> shoot an email to the list if you feel so compelled. I'd love to keep up with that
[19:04] <Zuph> We're trying to keep the info fairly low key until we do more inspections and tests, and contact Mark.
[19:04] <stilldavid> I just emailed him telling him that I'm really happy with everything so far.
[19:04] <Zuph> heh :)
[19:05] <Zuph> Yours may be in better shape than ours.
[19:05] <stilldavid> well, keep me posted here then. I might take it out of the box and fill it with air if it comes to it
[19:05] <stilldavid> thanks for the heads up!
[19:05] <stilldavid> I'm off to lunch...
[19:05] <Zuph> No problem. Enjoy lunch.
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[19:11] <jcoxon> hmmm strange, i'm getting 9 sats but no lock but am getting time
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[19:13] <chembrow> Grrr, spent the last hour and several yesterday trying to get an SD card working with an arduino with a level shifter rather than voltage dividers unsuccessfully
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[19:13] <chembrow> and it turns out to be a dodgy breadboard jumper
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[19:14] <jcoxon> that is grrrr
[19:15] <chembrow> yup. I need something better than a multimeter for testing with
[19:15] <Randomskk> scope :P
[19:15] <chembrow> yeah. then I just need to learn what the squiggly lines mean :p
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[19:34] <jcoxon> phew got a lock now
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[19:38] <chembrow> jcoxon is that with the gpsbee?
[19:39] <Laurenceb_> anyone got any old SDRAM modules they dont want?
[19:40] <chembrow> Laurenceb_ got a couple of 64mb
[19:40] Action: Laurenceb_ is after a 64MB SDRAM IC
[19:40] <Laurenceb_> 64MB would be too small
[19:40] <Laurenceb_> its really hard to find one that big
[19:41] <Laurenceb_> most are 32MB ICs
[19:41] <Laurenceb_> http://www.funkygiraffe.co.uk/index.php?page=shop.product_details&flypage=flypage-ask.tpl&product_id=47&category_id=6&option=com_virtuemart&Itemid=45
[19:41] <natrium42> SDRAMs are hard to use though
[19:41] <Laurenceb_> thats all ive found, not sure if i trust it
[19:41] <natrium42> are you connecting it to an FPGA?
[19:41] <Laurenceb_> no, a samsung SOC
[19:42] <NigeyS> laurenceb i have a load of sdram modules, but theyre ECC
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[19:42] <Laurenceb_> i suspect thats not suitable either
[19:42] <jcoxon> chembrow, yeah
[19:42] <jcoxon> its the one i got a while back
[19:42] <Laurenceb_> its strivial to get 32MB ICs, but 64 seems much more rare
[19:42] <chembrow> I've only got the 2 64mb pc100 full size dimms
[19:43] <Laurenceb_> ok nvm
[19:43] <jcoxon> hmmm does picoatlas really need an 868mhz modem
[19:43] <natrium42> hmm, i could check my bin of old HW
[19:44] <natrium42> when i am back home
[19:44] <chembrow> what were you planning on using the aerocomm for?
[19:45] <jcoxon> well i wanted to see the sort of range it could get
[19:45] <jcoxon> and would get up and downlink capabilities
[19:46] <fsphil> what baud rate does it use?
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[19:46] <jcoxon> seems to be variable depending on the connection
[19:46] <fsphil> ooh it's smart
[19:47] <jcoxon> 19200bps
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[19:47] <fsphil> wow
[19:47] <fsphil> that's fast
[19:47] <jcoxon> 250mW
[19:48] <jcoxon> otherwise picoatlas is complete
[19:48] <chembrow> there aren't any licensing issues with using that then? or are you looking at uplink only
[19:48] <jcoxon> chembrow, 868mhz is 500mW ISM freq
[19:48] <jcoxon> so is licence exempt
[19:49] <chembrow> if it's 500mW, why not use it instead of an NTX2 at 10mW in general then?
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[19:51] <Randomskk> higher free space path loss, plus most people don't have 868mhz receivers
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[19:52] Action: chembrow does some more googling...
[19:52] <jcoxon> its quite a new addition to the rules
[19:52] <jcoxon> and also most radios don't rx it
[19:52] <jcoxon> hence it hasn't been used much
[19:52] <jcoxon> fsphil, the datasheet quotes 15km LOS so if we were to apply the rules of range that we apply to the ntx2 (something like 500m LOS)... :-p
[19:52] <jcoxon> something tells me that it won't be on the same sort of scale
[19:52] <jcoxon> we gain a lot from our sensitive receviers on 434
[19:53] <fsphil> oh if only!
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[19:55] <chembrow> ah. that didn't occur to me as I don't have one of those sensitive receivers; just an ar8000
[19:55] <fsphil> isn't 868mhz in the tv band?
[19:55] <jcoxon> but yes 868 is a interesting freq
[19:55] <jcoxon> nearly
[19:56] <fsphil> ah yea just above
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[19:57] <fsphil> a tv pre-amp might cover that frequency
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[19:59] <jcoxon> a tv yagi..
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[20:02] <fsphil> shame this won't go higher, one of our telly aerials is vertical, has a mast-head amp and pointed in the right direction
[20:03] <jcoxon> well i've got 2 91cm foil balloons now
[20:03] <jcoxon> so it'll go a bit higher
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[20:03] <fsphil> ooh how big where the last ones you tried?
[20:04] <jcoxon> 45cm but with poor He methinks
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[20:06] <jcoxon> i would love the wind to go west
[20:06] <Randomskk> ffffff.
[20:06] <Randomskk> kicad's QFN28 part has a 0.5mm pitch
[20:06] <fsphil> ran a few predictions earlier, looks like it's heading north east
[20:06] <Randomskk> atmel's atmega88pa in qfn28 has 0.45mm pitch
[20:07] <Randomskk> damn it, these things are meant to be the same. D:
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[20:08] <Randomskk> kicad's thermal pad is 3mm, but atmel actually say it should be 2.4mm.
[20:09] <Randomskk> my footprint is too big for the part to have all its pins soldered, the wrong pitch for them all to connect, and has a thermal pad so large that it will either actually or very very nearly short all pins to ground
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[20:09] <Randomskk> well, damn.
[20:10] <Randomskk> better order another batch of PCBs I guess. can't think of any way around that.
[20:10] <Randomskk> that's really annoying.
[20:10] <SpeedEvil> dremel
[20:10] <SpeedEvil> oh
[20:10] <SpeedEvil> that fixes the second, but not the first
[20:10] <Randomskk> this is one of those problems even a dremel is unlikely to make much of an impact on
[20:10] <Randomskk> well it doesn't fix the pitch part or the too large part
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[20:14] <Randomskk> my problem is basically https://randomskk.net/u/arrgh_qfn28.jpg
[20:14] <griffonbot> Received email: Fergus Noble <fergusnoble@gmail.com> "Re: CC1111 radio (was Remote Payload release)"
[20:16] <Randomskk> damn. I can't think of any way around that short of soldering wires to each pad
[20:16] <Randomskk> and I really don't want to do that.
[20:16] <Randomskk> I think maybe I'll redesign it using damn tqfp parts >_>
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[21:41] <griffonbot> Received email: Edward Cunningham <edward.cunningham@gmail.com> "Re: CC1111 radio (was Remote Payload release)"
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[21:55] <griffonbot> Received email: James Coxon <jacoxon@gmail.com> "Re: CC1111 radio (was Remote Payload release)"
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[22:12] <griffonbot> Received email: Edward Cunningham <edward.cunningham@gmail.com> "Re: CC1111 radio (was Remote Payload release)"
[22:22] <jcoxon> ping eroomde
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[22:33] <jcoxon> anyone around to help me interpret a datasheet? regarding sending commands to my radiomodem
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[22:38] <griffonbot> Received email: Fergus Noble <fergusnoble@gmail.com> "Re: CC1111 radio (was Remote Payload release)"
[22:42] <fsphil> jcoxon, link?
[22:44] <jcoxon> http://www.lairdtech.com/WorkArea/linkit.aspx?LinkIdentifier=id&ItemID=2546
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[22:48] <fsphil> nice, an at command set
[22:48] <fsphil> so it's basically a modem
[22:48] <jcoxon> yeah
[22:48] <jcoxon> i'm trying to get it to drop into AT command mode
[22:50] <fsphil> looks like you just send a 6-byte command
[22:51] <jcoxon> thats what i'm trying
[22:51] <jcoxon> very similar code to how we set stuff on the ublox
[22:52] <jcoxon> uint8_t startAT[] = {0x41, 0x54, 0x2B, 0x2B, 0x2B};
[22:52] <jcoxon> sendAT(startAT, sizeof(setNav)/sizeof(uint8_t));
[22:52] <jcoxon> oops
[22:52] <jcoxon> found hte problem
[22:52] <jcoxon> haha
[22:52] <jcoxon> shouldn't just copy code
[22:52] <fsphil> lol
[22:52] <fsphil> it's skipping the first two bytes isn't it?
[22:52] <jcoxon> the sizeof() is wrong
[22:53] <fsphil> ah
[22:53] <jcoxon> its of the ublox bit
[22:53] <fsphil> the bit after that, that checks the response, skips the first two bytes too
[22:55] <jcoxon> hmmm so i'm sending AT+++ but its not dropping into at mode
[22:55] <jcoxon> instead its just passing it through the modem as data
[22:56] <fsphil> you have to wait at least a second after sending the binary command
[22:56] <jcoxon> but i'm seeing it on the other side of the modem
[22:57] <fsphil> no I'm reading it wrong any, it's one second before sending the binary command
[22:58] <fsphil> is it responding to the four bytes?
[22:58] <jcoxon> no
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[23:06] <Randomskk> jcoxon: isn't it +++ by itself with one second guard on either side?
[23:06] <Randomskk> or is this it being a bit weird?
[23:07] <jcoxon> ooo i think i've done it
[23:07] <jcoxon> actually no
[23:08] <jcoxon> it seems to say it wants AT+++ sent
[23:08] <jcoxon> and gives the hex to do it
[23:08] <Randomskk> does it mention anything about guard times?
[23:09] <jcoxon> yeah 1 second before
[23:09] <fsphil> the way I read it, AT+++ on it's own will work
[23:09] <fsphil> maybe it's picky about the newline character
[23:10] <jcoxon> nss.print("AT+++\r\n");
[23:10] <jcoxon> would that work then?
[23:10] <fsphil> it doesn't say where what it should be
[23:10] <fsphil> just AT+++
[23:10] <jcoxon> but it has that return arrow
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[23:11] <fsphil> maybe you have to send the binary command after the AT+++
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[23:17] <jcoxon> got it!
[23:17] <jcoxon> nss.print("AT+++\r");
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[23:19] <MI6VIM> hmpf, power cut
[23:19] Nick change: MI6VIM -> fsphil
[23:20] <jcoxon> fsphil, got it :-)
[23:20] <jcoxon> nss.print("AT+++\r");
[23:20] <fsphil> sweet
[23:20] <fsphil> so it's just picky
[23:20] <fsphil> you'd think they'd mention that
[23:20] <jcoxon> now to send the hex
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[00:00] --- Thu Jan 13 2011