highaltitude.log.20100111

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[00:32] <juxta> morning all
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[14:44] <jcoxon> russss, jontyw, the new hackspace place for weds evenings looks good - unfortuntely i'm on placement for hte next 4 months so won't be able to make it along for a whil
[14:44] <jcoxon> e
[14:46] <jontyw> Oh noes!
[14:46] <jontyw> Oh well
[14:46] <jontyw> Where will you be?
[14:47] <jcoxon> i'm in kent right now then will be over in whiltshire
[14:47] <russss> you have my condolences. A friend of mine is on placement in Basingstoke A&E, so it could be worse.
[14:47] <jcoxon> hehe
[14:48] <russss> I wanted to record one of your flight computer transmissions, but I guess I should just buy a radiometrix and emulate it myself.
[14:48] <jcoxon> russss, hehe or wait a bit and we'll be flying again
[14:49] <russss> I'll likely be in the USA while that happens
[14:49] <jcoxon> oh right :-p
[14:49] <jcoxon> well they'll be other flights
[14:49] <jcoxon> lots of other flights
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[17:53] <jcoxon> evening all
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[21:06] <jcoxon> dum dee dum dum
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[21:45] <jcoxon> hey natrium42
[21:45] <natrium42> hi
[21:46] <jcoxon> can you email me your address so i can post those radio modules to you
[21:46] <natrium42> sure
[21:46] <natrium42> GMAS
[21:46] <jcoxon> also we should have a trans-a meeting soon
[21:47] <natrium42> done
[21:47] <natrium42> sure
[21:47] <jcoxon> great
[21:47] <jcoxon> got it
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[22:01] <Laurenceb> hi
[22:01] <Laurenceb> http://www.kayelaby.npl.co.uk/general_physics/2_7/2_7_6.html
[22:02] <Laurenceb> kind of useful... but needs a script or something to get B field vectors out
[22:03] <russss> "crustal field" is the best phrase ever.
[22:07] <Laurenceb> heh
[22:08] <Laurenceb> thing is someones got to have written a script for doing this - I just cant find it
[22:10] <Laurenceb> nothing on matlab central :-/
[22:10] <Laurenceb> tho this looks useful - http://www.mathworks.com/matlabcentral/fileexchange/24586-intoduction-to-the-gravity-field-of-earth
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[22:24] <Laurenceb> http://www.rapidonline.com/Electronic-Components/Optoelectronics/Miniature-Lamps/Grain-of-rice-lamp/81587/kw/
[22:24] <Laurenceb> looks good for airspeed measurement
[22:25] <SpeedEvil> hot wire ++
[22:25] <SpeedEvil> The 1940s can't be wrong.
[22:25] <SpeedEvil> Or ultrasound
[22:25] <SpeedEvil> generate ultrasound, listen for phase shifts at a distant reciever
[22:26] <Laurenceb> too complex
[22:26] <Laurenceb> that bulb + simple opamp circuit and into an ADC
[22:26] <SpeedEvil> that is inded simple.
[22:26] <Laurenceb> <20ma @3.3v
[22:26] <Laurenceb> cant complain at the power use either
[22:26] <SpeedEvil> different inaccuracies than hot wire
[22:27] <SpeedEvil> IIRC you want to run them at about 0.2* rated volts
[22:27] <SpeedEvil> but it's been a while
[22:27] <Laurenceb> 200mv or so
[22:27] <Laurenceb> that makes it easy
[22:28] <Laurenceb> IMO its much more suited to mini UAV use
[22:28] <SpeedEvil> yep.
[22:28] <SpeedEvil> I wish the invensys gyros were available.
[22:28] <Laurenceb> pitot tubes with sensible priced and size pressure sensors are only good above 10m/s
[22:28] <SpeedEvil> I have had no responsed rom them to my enquiry for more info
[22:28] <Laurenceb> I see
[22:29] <Laurenceb> I'm thinking about a UAV board design
[22:29] <Laurenceb> with an atmega - basically a sensible version of the sparkfun board
[22:29] <SpeedEvil> hmm
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[22:31] <Laurenceb> 12mhz, cc1020 on the board, and pwm in/out, with some logic to do pwm switching
[22:32] <Laurenceb> then the capability to drive an airspeed sensor and som flash for datalogging
[22:32] <SpeedEvil> Interesting.
[22:32] <Laurenceb> and a gps socket and smps for the power
[22:33] <SpeedEvil> pwm for several servos I suppose?
[22:33] <SpeedEvil> and some unpopulated spots for open drain drivers?
[22:33] <SpeedEvil> 1wire?
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[22:54] <Laurenceb> that means annoyingly precise timing
[22:54] <Laurenceb> I was thinking of running a real time executive
[22:54] <Laurenceb> bbl - eating
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[23:20] <Laurenceb> SpeedEvil: same as diydrones - two 16 bit pwm channels for elevator and rudder or v tail, and one 8 bit for throttle
[23:21] <Laurenceb> then some logic for switching incoming pwm from an Rx - triggered by one incoming channel going into input capture
[23:21] <Laurenceb> so a sane pwm input causes it to switch to Rx control
[23:21] <SpeedEvil> hmm
[23:22] <SpeedEvil> sounds sane
[23:22] <Laurenceb> the thing I'm not sure about is the gyros - the SFE design is a bit dodgy as the ST gyro noise is about 0.25lsb
[23:22] <Laurenceb> its how I do it on the rogallo - so just a c&p job with the code :D
[23:23] <Laurenceb> maybe one of the ST I2C gyros for yaw and an invisense dual axis gyro for roll and pitch
[23:28] <Laurenceb> or use the dual rate output - but theres not enough ADC inputs
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[23:37] <Laurenceb> I wonder if you could tie Vref outputs on two ST gyros
[23:38] <SpeedEvil> you mean so you only need one adc
[23:39] <SpeedEvil> hmm
[23:39] <SpeedEvil> I meant - invensys - the 3 axis i2c one that's upcoming
[23:39] <Laurenceb> sure, if you can get hold of it
[23:40] <SpeedEvil> pity doesn't seem so.
[23:40] <Laurenceb> I was thinking the ST gyros onto an atmega adc
[23:40] <SpeedEvil> what is the atmega adc - 12 bit?
[23:42] <Laurenceb> 10
[23:44] <Laurenceb> if you set Vref on the adc to 1.1v internal ref and put a ST gyro through an pot divider then you can get the noise equal to 0.58lsb RMS
[23:44] <Laurenceb> guess its not that bad
[23:45] <SpeedEvil> what do you mean by noise.
[23:45] <SpeedEvil> the short term 1/f?
[23:45] <Laurenceb> the actual intrinsic gyro noise from the datasheet
[23:45] <Laurenceb> 0.035degrees/sec/sqrt(Hz)
[23:45] <SpeedEvil> doing any filtering first?
[23:47] <Laurenceb> nope, just the internal 140hz low pass
[23:52] <Laurenceb> an rare case of more noise required
[23:54] <Laurenceb> adc will tend to "stick" resulting in an apparent bias drift
[23:57] <SpeedEvil> that's what .414degrees/s noise?
[23:57] <Laurenceb> guess you can clock the adc faster to get it a bit noisy
[23:58] <Laurenceb> yeah
[23:58] <Laurenceb> I guess the faster adc clocking will solve any problems, and have a nice side effect of speeding things up
[23:58] <SpeedEvil> are you actually going to be reading it at 140Hz though?
[23:59] <Laurenceb> but still - three analogue gyros = three outputs and 2 vref outputs, then airspeed sensor and battery voltage
[23:59] <Laurenceb> 7 adc channels and only 6 avaliable :-/
[23:59] <SpeedEvil> umm.
[23:59] <Laurenceb> read at 300Hz and average, run the attitude filter at 50hz
[00:00] --- Tue Jan 12 2010