highaltitude.log.20060710

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[18:29] <jcoxon> Pegasus III L - 4days 15hours
[18:31] <jcoxon> rocketboy, cambridge have been given permission - you around on saturday?
[18:34] <rocketboy> yes no probs
[18:34] <jcoxon> cool
[18:34] <jcoxon> sat will be the first attempt
[18:34] <jcoxon> will need to monitor the weather
[18:35] <rocketboy> looking for north jet stream?
[18:35] <jcoxon> best would be jetstream going west (so an easterly)
[18:36] <rocketboy> does that happen often?
[18:36] <jcoxon> well sometimes
[18:36] <jcoxon> basically a high pressure can create them
[18:37] <jcoxon> they'll be exceedingly slow and possible non existent
[18:37] <jcoxon> sat/sun is good for them
[18:38] <jcoxon> i reckon we'll be fine though i'll keep an eye on it
[18:38] <rocketboy> humm - I thought the jetstream was as a result of coriolis effect
[18:38] <rocketboy> - and therefore
[18:38] <jcoxon> yeah it is
[18:38] <jcoxon> but when there isn't much of a stream the high pressure effects it
[18:39] <jcoxon> basically the 300mb forecast shows that there isn't a jetstream and therefore its more relative to the highpressure system
[18:39] <rocketboy> - so it should always have a west to east component - I guess its airflow so its got some element of unpredictability
[18:39] <rocketboy> of
[18:40] <jcoxon> it occurs in waves so when the stream is say to the north of us it won't effect us
[18:40] <jcoxon> right now its right above us
[18:40] <phatmonkey> ah, hi james
[18:40] <jcoxon> hey phatmonkey
[18:40] <jcoxon> rocketboy, in regards to the cutdown circuitry
[18:40] <jcoxon> maplin don't have that particular mosfet
[18:41] <jcoxon> what should i look for?
[18:42] <rocketboy> I can suggest a alternative - I'll have a look at what maplins offers - or I can have a look in my store (junk box)
[18:42] <phatmonkey> try farnell, they have everything
[18:43] <rocketboy> Almost any low voltage N channel power FET capable of 10 Amps would do
[18:43] <jcoxon> right cool
[18:43] <jcoxon> i'll look at hte maplin website
[18:45] <rocketboy> The one specified is carries by Rapid electronics - http://www.rapidonline.com/
[18:45] <rocketboy> carried
[18:45] <jcoxon> hmmm i sort of need it asap - there is a maplin show in cambridge
[18:52] <rocketboy> Maplins seem to carry quite a range - I'm not sure how many they will carry in the shops though - as a backup I can ship you somhing in the post - should get to you wednesday
[18:53] <jcoxon> they are quite good to tell the truth
[18:53] <jcoxon> if you give me a pointer i can go in tomorrow
[18:55] <rocketboy> ok - I'll get do some searches on the list
[18:55] <jcoxon> thanks rocketboy
[18:55] <jcoxon> right i'll be back later
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[20:46] <phatmonkey> you around jcoxon ?
[20:50] <rocketboy> any of you guys know how much current the gunstix I/O port will source?
[20:54] <phatmonkey> which I/O port? the 60/92 pin connectors?
[20:54] <phatmonkey> probably worth asking on the mailing list
[22:33] <rocketboy> ta
[22:52] <macfreak4> Whoa this is amazing
[22:52] <macfreak4> i've never seen 1600x1200 res on a monitor before
[22:52] <macfreak4> i like :)
[22:57] <phatmonkey> :o
[22:58] <phatmonkey> you should see 2500xsomething on the huge 30" apple displays :D
[22:58] <phatmonkey> ... dual screen
[22:58] <macfreak4> oh wait
[22:58] <macfreak4> i have
[22:58] <macfreak4> yeah
[22:58] <macfreak4> but not on my own desk :P
[22:58] <phatmonkey> true...
[22:58] <phatmonkey> brb, switching computers
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[23:00] <macfreak4> brb
[23:00] <macfreak4> restarting
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[23:01] <phatmonkey> jcoxon ... here?
[23:13] <jcoxon> hey phatmonkey
[23:13] <phatmonkey> ah hokay, i'm having trouble with the STUART port on my gumstix
[23:13] <phatmonkey> connected via the robostix
[23:13] <phatmonkey> i haven't got it in front of me right now
[23:14] <jcoxon> whats the problem?
[23:14] <phatmonkey> but i'm getting no data through it, but sometimes some scrambled binary data gets through
[23:15] <phatmonkey> oh wait, hooking up my gps
[23:15] <phatmonkey> when i put a voltmeter on it, i'm getting pulses of data every second, so that's working
[23:15] <phatmonkey> it's definitely all at 4800 baud
[23:15] <phatmonkey> there is another serial output on the gps which *works*
[23:15] <phatmonkey> apparently electrically identical to the NMEA serial output
[23:16] <phatmonkey> so, um, i've got no ideas
[23:16] <jcoxon> so you've connected your gps unit to the STUART
[23:16] <phatmonkey> yes
[23:16] <jcoxon> and all the voltage shifting is correct
[23:16] <phatmonkey> gpsd cycles through all the baud rates on the port then exits with a segfault, hmm
[23:16] <phatmonkey> yep, everything's at 5v ttl
[23:17] <jcoxon> sure the gps ain't rs232?
[23:18] <phatmonkey> yep
[23:19] <jcoxon> how are you reading the gps?
[23:19] <phatmonkey> i specifically bought a ttl gps, and the voltmeter is showing ttl levels
[23:19] <phatmonkey> cat /dev/ttyS2
[23:19] <phatmonkey> and gpsd -N -D 1 /dev/ttyS2
[23:19] <phatmonkey> which cycles through the baud rates then exits with a segfault
[23:19] <phatmonkey> very odd
[23:19] <jcoxon> how about gpsd -N -D 5 /dev/ttyS2
[23:19] <phatmonkey> i shall have to try tomorrow
[23:20] <jcoxon> have you tried t echo some data
[23:20] <jcoxon> connect rx to tx
[23:21] <rocketboy> hi - I checked out the Mapin power FETS and didn't much like them - so I have changed the circuit for a power darlington
[23:21] <jcoxon> oh right
[23:23] <rocketboy> the circuit would take about 5mA drive from the gumsix I/O - do you know how much drive the gumstix I/O puts out?
[23:23] <phatmonkey> connect rx to tx - i will try that tomorrow
[23:23] <phatmonkey> odd that the other port works though
[23:25] <jcoxon> rocketboy, i don't but i'll have a little browse
[23:25] <rocketboy> the BDX33B that Maplins do should be OK too
[23:27] <rocketboy> or the BDW93C from them will do also
[23:28] <jcoxon> so i'll use 1 gpio to power the circuit providing 3.3V
[23:28] <jcoxon> and then another to supply the pulse
[23:34] <rocketboy> I would wire the power directky to the battery - It souldn't draw any current when not being fired
[23:36] <jcoxon> the gumstix power pack provides 6v
[23:36] <jcoxon> but the radio modem power pack provides 4.5V
[23:36] <Tiger^> hey
[23:36] <jcoxon> hey Tiger^
[23:41] <rocketboy> 6V power will be just fine (better in fact)
[23:41] <jcoxon> ooo okay
[23:41] <jcoxon> i'll stick that in parallel
[23:41] <jcoxon> to the gumstix
[23:41] <rocketboy> OK
[23:42] <rocketboy> spiffing
[23:43] <jcoxon> forecasts still look good for sat.
[23:44] <rocketboy> excellent
[23:45] <jcoxon> the 200mb and 300mb maps show winds of <10knots
[23:46] <phatmonkey> yay!
[23:50] <rocketboy> I have the reciever and yagi ready
[23:51] <jcoxon> cool
[23:51] <rocketboy> I will repeat 1000 times - i before e except after c
[23:51] <jcoxon> :-)
[23:53] <rocketboy> OK - let me kow how you get on with Maplins
[23:53] <jcoxon> yeah
[23:53] <jcoxon> it seems some gpios do +/- 3mA
[23:53] <jcoxon> and some +/-10mA
[23:54] <rocketboy> go for the 10mA ones if you can
[23:54] <jcoxon> trying to work out which is which
[23:56] <rocketboy> If you can't use a 10mA one replace the 330 ohm resistor with a 750ohm resistor and the 3mA port will still just about be OK (but the 10mA port and 330hm would be better)
[23:57] <jcoxon> right okay
[23:57] <jcoxon> (again) thanks for all this :-D
[23:57] <rocketboy> anyway I'm off to bed - CU Guys
[23:58] <rocketboy> no problems
[23:58] <rocketboy> this is fun
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[00:00] --- Tue Jul 11 2006