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[08:06] <jcoxon> oh dear
[08:06] <jcoxon> the makezine payload has been lost
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[21:34] <edwardmoore> hi jcoxon
[21:35] <jcoxon> hey edwardmoore
[21:35] <jcoxon> thanks rocketboy for those predictions
[21:35] <jcoxon> hope they help!
[21:35] <edwardmoore> ?
[21:36] <edwardmoore> i've been away and missed everything i think
[21:36] <jcoxon> oh sorry
[21:36] <jcoxon> cause the make guys have lost their payload
[21:36] <jcoxon> they asked for some landing site predictions
[21:37] <edwardmoore> oh yeah i was wondering if someone clever here could help them
[21:37] <rocketboy> jc yeah - I have to work on using the descent data
[21:37] <rocketboy> hi ed
[21:37] <edwardmoore> hi steve
[21:37] <rocketboy> I have had a go at a prediction using the algortitem I put up on the wiki - its worked well before
[21:38] <jcoxon> i see you replied to eric
[21:38] <jcoxon> wondering if its worth me forwarding it to the mailing list of theirs which i'm on
[21:38] <rocketboy> yeah - I have just noticed an error in the 2nd predition - so I will have to re-work that
[21:39] <rocketboy> so if you forward it could you say that the 2nd one is wrong
[21:39] <rocketboy> I'll try and re-work it later
[21:40] <edwardmoore> ok just reading through emails.... 8 bit is fine for these kind of servos
[21:40] <edwardmoore> they have dead-zones the size of the pacific ocean anyway
[21:41] <rocketboy> ta
[21:41] <rocketboy> Been working on the code today
[21:41] <rocketboy> and making the pully on my lathe
[21:41] <edwardmoore> been eating easter-eggs today
[21:43] <edwardmoore> oh cool how's that been going?
[21:44] <rocketboy> Chocolate ..... Homer Simpson like drool
[21:44] <edwardmoore> my uncle is a huge antique gun collector
[21:44] <edwardmoore> (we were at his house for easter)
[21:45] <edwardmoore> and he has built himself the most amazing.... bunker
[21:45] <rocketboy> yeah - a bit slow because I'm having to do the odd job round the house too - like putting the side back on the bath
[21:46] <jcoxon> rocketboy, have you seen this? http://balloon.pbwiki.com/EasterEggHunt
[21:46] <edwardmoore> it's beautiful, mahogony cabinets with display cases, really nice furniture. french doors onto the garden but with a bull-proof electric shutters. it's rediculous but kinda cool
[21:46] <edwardmoore> anyhoo, that was a random asside
[21:47] <rocketboy> Ah - I went down the local rifle club recently and fired my mates marksman like rifles
[21:47] <rocketboy> lots of kick
[21:47] <edwardmoore> i love the old duelling pistols with sort of 20mm bores
[21:48] <rocketboy> almost bruised my arm
[21:48] <edwardmoore> we got him to fire one of his baby cannons. was good
[21:48] <edwardmoore> most of somerset must have heard it i think
[21:48] <rocketboy> sounds like fun
[21:49] <edwardmoore> james wouldn't appreciate it, though
[21:49] <edwardmoore> it's chemicals and explosives and things
[21:49] <rocketboy> no?
[21:49] <edwardmoore> if only HMS Victorious had gumstix
[21:49] <rocketboy> ah an adversion to things that go bang?
[21:49] <edwardmoore> by which i mean, HMS Victory
[21:49] <edwardmoore> *blushes*
[21:49] <jcoxon> comparing your prediction to the other one on their wiki
[21:50] <jcoxon> its about 3.5 miles different
[21:50] <edwardmoore> that's right james, rise above it :p
[21:50] <jcoxon> oi oi
[21:50] <rocketboy> we will see who is right
[21:50] <jcoxon> its not that i have an aversion to chemicals and explosiosn
[21:50] <edwardmoore> a pint says Steve beats Bre
[21:50] <jcoxon> its just i have an adversion to homemade chemicals and explosions
[21:50] <edwardmoore> Bre is a kind of cheese, anyway
[21:51] <rocketboy> Ah well I'm off to watch a DVD - bbl
[21:51] <edwardmoore> ok cya later
[21:52] <edwardmoore> i'll be sensible by then
[21:52] <jcoxon> right edwardmoore - ground control software
[21:52] <jcoxon> i've got cocoamodem logging to a file
[21:52] <edwardmoore> hit me
[21:52] <edwardmoore> awesome- a bodge or easy?
[21:52] <jcoxon> easy
[21:52] <jcoxon> (its all a bodge)
[21:53] <jcoxon> now the issue is about trying to sort out the junk its going to record
[21:54] <edwardmoore> can it record whatever it's given?
[21:54] <edwardmoore> by which i mean we could transmit anything up to, say, 20 properties, and it just figures out what it's got and what it hasn't
[21:55] <edwardmoore> or maybe records what it's set to in a field type thing, and just logs anything it doesn't recgonise`?
[21:55] <jcoxon> at the mo it records everything to file
[21:55] <jcoxon> its more how we pick the useful info out
[21:55] <jcoxon> and i'd rather not do it by eye
[21:55] <edwardmoore> ok so the google maps button is currently not linked to the log file?
[21:55] <jcoxon> no no
[21:56] <jcoxon> the google map file takes the long and lat from the serial gps at the mo
[21:56] <jcoxon> basically the program will read the log file
[21:56] <jcoxon> dump its contents into the main window ( the rx tab)
[21:56] <jcoxon> then i want to have it enter the long and lat etc into the boxes at teh side
[21:57] <jcoxon> i'm thinking of having strings transmitted say 3 times
[21:57] <jcoxon> and it compares them to get the most accurate position
[21:57] <jcoxon> taking into account corruption during transmission
[21:57] <jcoxon> (have teh string the same for each send)
[21:57] <jcoxon> does that make sense?
[21:58] <edwardmoore> yeah so error checking and correction
[21:58] <jcoxon> basically yeah
[21:58] <jcoxon> so we'll get a copy of the raw data
[21:58] <edwardmoore> there *might* be more efficient ways of doing it, but truthfully error correction is all way above me and not something i do till next year
[21:58] <jcoxon> but the program will also extract the data
[22:01] <edwardmoore> that's easy enough isn't it?
[22:01] <jcoxon> hope so
[22:01] <jcoxon> the poor program will have to have a seperate thread
[22:01] <edwardmoore> yeah
[22:01] <jcoxon> and overcome the issue of crashing when a scroll bar is required :-D
[22:02] <edwardmoore> it would be smart if it could seperate each cycle of telemtry
[22:02] <edwardmoore> so just have a number index running down the left hand side of the rx screen
[22:02] <jcoxon> hmmmm that could be done quite easily
[22:02] <edwardmoore> 1) position : 0./4783y54, 6.748367483 temperature: chuffing chilly etc...
[22:02] <jcoxon> if when sending data it sent a line return
[22:03] <edwardmoore> yeah
[22:03] <jcoxon> then we could use "tail"
[22:03] <jcoxon> to read the last line
[22:03] <jcoxon> and input that into a table instead of a blank field
[22:03] <edwardmoore> but have it so that the program actually treats it as a numbered cycle too. so if we say 'cycle 867' it knows where to look
[22:03] <edwardmoore> yep, that's the one
[22:04] <jcoxon> ooo ta
[22:04] <jcoxon> oops
[22:04] <jcoxon> ooo thats something you could do
[22:04] <jcoxon> do you still have cocoamodem?
[22:04] <edwardmoore> yep
[22:04] <jcoxon> is there a chance you could record a little wav of some rtty?
[22:04] <jcoxon> so i can play it to test the system?
[22:05] <edwardmoore> ok.... tho i'm not quite following
[22:05] <edwardmoore> what do you want and how should it be done?
[22:05] <jcoxon> basically use cocoamodem to generate some rtty
[22:06] <jcoxon> say a string with some numbers and letters
[22:06] <jcoxon> and record it
[22:06] <jcoxon> then i can use the sound file to simulate me having a radio
[22:06] <edwardmoore> ok. before i do, you know there's some rtty on wikipedia?
[22:06] <jcoxon> oh right
[22:06] <jcoxon> i'll use that then
[22:06] <edwardmoore> just says something like 'this is wikipedia. it's cool. also this is trry. have a nice day' or somehting
[22:09] <jcoxon> annoyingly it doesn't tell you the settings
[22:09] <jcoxon> such as the baud
[22:10] <edwardmoore> 45.45 baud, central frequency 1000 Hz, shift 170 Hz, 5 data bits (Baudot), no parity, 1.5 stop bits.
[22:11] <edwardmoore> at least, that's what it sounds like ;)
[22:17] <jcoxon> so if i put raw rs232 through the radio is that rtty?
[22:17] <edwardmoore> nope don't think so
[22:17] <edwardmoore> but the man to ask is currently watching a dvd
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[22:20] <Laurenceb> Hi all
[22:21] <edwardmoore> hi dr nick
[22:21] <Laurenceb> grr avr-dos is annoying me
[22:21] <Laurenceb> why am I dr nick???
[22:21] <edwardmoore> dunno. run with it
[22:21] <Laurenceb> okay...
[22:22] <Laurenceb> error 225 grr wtf does that mean?
[22:22] <Laurenceb> Think avr-dos is a bit over my head
[22:23] <jcoxon> oooo cocoamodem can play wav files directly
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[22:23] <jcoxon> its decoding nicely
[22:23] <jcoxon> will need to get me an mic input on my lapto
[22:23] <jcoxon> p
[22:23] <Laurenceb> I could make an mp3 player if I got avr-dos working
[22:23] <Laurenceb> DIY-POD :)
[22:25] <Laurenceb> Was looking at the analogue devices site, they have some guidance on how to calibrate a rate gyro
[22:26] <Laurenceb> take measurements of gain and null at 4 or 5 points over temperature range, and then do a smooth fit between then, to make a lookup table
[22:27] <Laurenceb> it with then have a drift of approx 1 degre per minute or less !
[22:28] <mc-> I don't think you will get it that good...
[22:28] <Laurenceb> thats what they say
[22:28] <mc-> I've got a AD gyro here, it seemed to drift around when sat on the bench.
[22:29] <edwardmoore> gimme a 'k'
[22:29] <edwardmoore> etc
[22:29] <mc-> btw, JC, rtty isn't the same as RS232 into a radio..
[22:29] <jcoxon> yeah i sort of knew that in the back of my mind
[22:30] <Laurenceb> mc- what sort of gyro?
[22:30] <jcoxon> however henry and i did an experiement putting raw rs232 (on a ttl level) into the radio with no shaping etc
[22:30] <jcoxon> and he manged to decode it
[22:30] <jcoxon> so was wondering what setting he used
[22:30] <mc-> yes, that will work, probably 300 baud.
[22:30] <mc-> I was using a AD gyro, can't remember the part no.
[22:31] <jcoxon> using the rtty setting?
[22:31] <Laurenceb> apparently when it starts up its a bit unstable
[22:31] <Laurenceb> according to the guidance on calibration
[22:31] <Laurenceb> if you leave it for 15 minutes it gets better
[22:32] <mc-> AFAIK, rtty has a narrow frequency spread, so you have to make sure the radio has a small deviation
[22:33] <Laurenceb> that level of drift would be very nice as the gyro would effectivly improve the accuracy of the gps headings
[22:33] <Laurenceb> it'd be perfect for a parawing
[22:34] <jcoxon> mc-, thanks, also i gave partydays a call ut they weren't there - will try on tues
[22:35] <Laurenceb> so I might try it out as everyones going for parawings, with a rigid glider thermopiles would probably be better
[22:36] <mc-> cya all
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[22:37] <Laurenceb> jcoxon, if you put in raw ttl, it'l use more bandwdth and decrease the range
[22:38] <jcoxon> yeah i know
[22:38] <jcoxon> tis an experiment
[22:38] <jcoxon> 30 secs of morse
[22:38] <jcoxon> then 30 secs of ttl
[22:40] <Laurenceb> I see
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[23:13] <Laurenceb> http://www.seattlerobotics.org/encoder/200311/brown/building_a_directional_gyro.html
[23:45] <Laurenceb> aha error 225 means the card is probably incompatable, need a decent brand, cheap ones dont like spi mode it appears
[23:55] <Laurenceb> cya all
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[00:00] --- Mon Apr 9 2007