highaltitude.log.20100128

[00:24] <Laurenceb> http://hackaday.com/2010/01/27/nanotouch-a-tiny-avr-media-thing/
[00:24] <Laurenceb> the hell
[00:25] <Laurenceb> I cant believe that
[00:27] <Laurenceb> http://www.youtube.com/user/MeadesShrine <- genius
[00:27] <MikeMc68> that is awesome
[00:31] <Laurenceb> gtg
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[01:16] <Randomskk> http://www.qwantz.com/index.php?comic=1641 on topic guys
[01:24] <natrium42> hehe
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[10:43] <Laurenceb> http://www.youtube.com/watch?v=lQnT0zp8Ya4
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[10:47] <juxta> is the ipad just an oversized iphone with less functionality?
[10:48] <SpeedEvil> looks like
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[11:31] <Laurenceb> SpeedEvil: did you say hot wire anemometers made from bulb filament require 0.2* the recommended operating volatage?
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[11:51] <SpeedEvil> that was from memory
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[11:55] <Laurenceb> ah ok - I was looking for some links
[11:56] <Laurenceb> trying to work out if its practical to run directly off an opamp
[11:56] <Laurenceb> and what sort of voltage needs to be applied
[11:57] <Laurenceb> the Rapid bulbs require 1.5V, 15ma for mormal operation
[11:57] <SpeedEvil> IIRC I just used a 7805 and a small R
[11:57] <SpeedEvil> for a normal torch bulb
[11:57] <Laurenceb> I want to do constant temperature
[11:57] <SpeedEvil> k
[11:58] <Laurenceb> so opamp and a bridge, just looking at the selection of opamps
[11:58] <Laurenceb> I want to run it off 3.3v, so that limits the choice of opamps
[11:58] <Laurenceb> then if it has to source or sink 20ma or so
[11:59] <Laurenceb> guess I'll try it out
[12:00] <Laurenceb> so the main source of heat loss in these small bulbs is conduction through the base?
[12:00] <Laurenceb> that would explain why exposing the filament doesnt mean a big increase in the required voltage
[12:02] <SpeedEvil> vastly, yes
[12:03] <SpeedEvil> low voltage bulbs rather
[12:03] <Laurenceb> need some ~3mm ID metal tube to mount it in I think
[12:03] <SpeedEvil> the lower voltage a bulb, for a given wattage, all else being equal, the igher the loss through conduction into the base
[12:03] <Laurenceb> and of course at some point an airframe
[12:03] <Laurenceb> yeah
[12:04] <Laurenceb> the RTF plane they are using on DIYdrones is very expensive
[12:04] <Laurenceb> about £90
[12:04] <SpeedEvil> oh - the main loss is conduction - but I'm not quite sure if it's into the base or through the walls
[12:04] <Laurenceb> yeah
[12:04] <SpeedEvil> a little he could answer
[12:05] <Laurenceb> http://www.rctoys.com/product-view/GBP/rc-toys-and-parts/VE-3CHPLANE/RC-AIRPLANES-VORTEX-EXTREME.html?utm_source=googlebase_froogle&utm_medium=UK&utm_term=VE-3CHPLANE
[12:05] <Laurenceb> I'm after something like that
[12:06] <Laurenceb> I'm sure you could pick up stuff like that for £40 about 5 years ago :(
[12:06] <SpeedEvil> maybe inflex over in ##electronics might have an idea
[12:06] <SpeedEvil> he sells stuff in that area - and might have some ideas.
[12:07] <Laurenceb> mainly proper RC stuff
[12:07] <Laurenceb> talking of which I have a glow engined plane I want to sell
[12:07] <SpeedEvil> yes
[12:07] <Laurenceb> if anyones interested
[12:07] Action: Laurenceb is more interested in cheap foam stuff atm - for UAV work
[12:08] <SpeedEvil> Not me.
[12:08] <Laurenceb> about 2.5m wingspan - very big
[12:09] <SpeedEvil> ah
[12:11] <SpeedEvil> not considered an electric conversion?
[12:11] <SpeedEvil> or are you worried about the ground intersections if used as UAV
[12:14] <Laurenceb> its just too big and worth too much
[12:14] <Laurenceb> quite heavy as well ab out 3Kg
[12:18] <Laurenceb> http://www.rctoys.com/product-view/GBP/rc-toys-and-parts/VR-REFURB/RC-AIRPLANES-VORTEX.html?utm_source=googlebase_froogle&utm_medium=UK&utm_term=VR-REFURB
[12:18] <Laurenceb> ^ thats what I was looking for - I got one for £45 about 5 years ago
[12:19] <Laurenceb> but only throttle and rudder controls
[12:20] <SpeedEvil> yeah - not ideal for control authority
[12:20] <SpeedEvil> well - at least not in non-still air
[12:20] <Laurenceb> probably pretty easy to add elevator to it
[12:21] <Laurenceb> its nice and small
[12:25] <Laurenceb> http://www.falcom.de/products/gps-modules/fsa03/
[12:26] <Laurenceb> might add a footprint for that
[12:26] <SpeedEvil> afk - feeling horrible and going back to sleep. Good luck in your quest!
[12:26] <Laurenceb> cya
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[14:26] <SpeedEvil> Laurenceb: done any VB programming to a serious level?
[14:27] <Laurenceb> visual basic?
[14:27] <SpeedEvil> yes
[14:27] <Laurenceb> I've hacked the ms office paperclip
[14:27] <Laurenceb> thats all
[14:27] <SpeedEvil> random ping from a relative - asking if I'd done it.
[14:27] <SpeedEvil> k - nvm.
[14:28] <SpeedEvil> falcom thing looks shiny
[14:29] <Laurenceb> I have one
[14:29] <Laurenceb> 44 euros IIRC
[14:30] <Laurenceb> only issue relative to the larger ublox5 modules is no config flash onboard
[14:30] <Laurenceb> so you need to set it up over serial each time its powered on
[14:34] <SpeedEvil> not horrible
[14:34] <SpeedEvil> generally
[14:43] <Laurenceb> also they reduced the power consumption to half
[14:44] <Laurenceb> 40ma @3.3v as opposed to about 80 on the larger modules
[14:44] <SpeedEvil> nice
[14:44] <Laurenceb> pity theres no ublox6 modules
[14:45] <Laurenceb> apparently thats half again, but the ublox6 QFN is a pain to obtain
[14:45] <Laurenceb> they require an NDA for the docs and stuff
[14:46] <SpeedEvil> :/
[14:46] <Laurenceb> still the ublox5 is pretty awesome for anything serious
[14:47] <Laurenceb> e.g. you can get it to chuck out matrices from the onboard kalman filter over the serial
[14:48] <SpeedEvil> fun.
[14:48] <SpeedEvil> Can you poke those matrices - or is it read-only?
[14:49] <Laurenceb> I think you can poke them.. cant remember
[14:49] <Laurenceb> the docs are a bit lacking in places, but they appear helpful when emailed
[14:50] <Laurenceb> IIRC they have undocumented features for running a kalman filter onboard with accel gyro etc data being sent in
[14:50] <Laurenceb> its all done in fixed point on an ARM7 core
[14:51] <Laurenceb> but I doubt you could do a great deal as its clocked very slowly
[14:52] <Laurenceb> its designed for car navigation in tunnles etc
[14:52] <Laurenceb> so youd go down to 1Hz output or so
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[17:31] <MikeMc68> evening
[17:32] <jcoxon> hey MikeMc68
[17:34] <MikeMc68> hey James
[17:37] <jcoxon> hey MikeMc68
[17:37] <MikeMc68> lol
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[21:34] <Laurenceb> natrium42: any chance of getting me some IMU data?
[21:34] <natrium42> yah, next week :P
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[21:36] <natrium42> ooh --> http://www.engadget.com/2010/01/28/clear-wimax-usb-modem-impressions/
[21:36] <natrium42> would be nice for balloon launch broadcasts
[21:36] <natrium42> wimax coverage is pretty good here
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[00:00] --- Fri Jan 29 2010