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[14:44] 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] e [14:46] Oh noes! [14:46] Oh well [14:46] Where will you be? [14:47] i'm in kent right now then will be over in whiltshire [14:47] you have my condolences. A friend of mine is on placement in Basingstoke A&E, so it could be worse. [14:47] hehe [14:48] 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] russss, hehe or wait a bit and we'll be flying again [14:49] I'll likely be in the USA while that happens [14:49] oh right :-p [14:49] well they'll be other flights [14:49] lots of other flights [16:09] bt42 (n=User@unaffiliated/bittwist) joined #highaltitude. [16:21] sbasuita (n=sbasuita@unaffiliated/drebellion) joined #highaltitude. 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[19:54] junderwood__ (n=John@adsl.jcu.me.uk) joined #highaltitude. [19:55] junderwood_ (n=John@adsl.jcu.me.uk) left irc: Read error: 104 (Connection reset by peer) [20:24] bittwist (n=User@unaffiliated/bittwist) joined #highaltitude. [21:06] dum dee dum dum [21:24] Simon-MPFH (n=simon@phantom.mpfh.co.uk) left irc: "Leaving" [21:27] Xenion (n=robert@p579FCE11.dip.t-dialin.net) joined #highaltitude. [21:43] natrium42 (n=natrium@CPE000625d867e2-CM0014045885be.cpe.net.cable.rogers.com) joined #highaltitude. [21:45] hey natrium42 [21:45] hi [21:46] can you email me your address so i can post those radio modules to you [21:46] sure [21:46] GMAS [21:46] also we should have a trans-a meeting soon [21:47] done [21:47] sure [21:47] great [21:47] got it [21:54] jcoxon (n=jcoxon@host86-158-61-196.range86-158.btcentralplus.com) left irc: Read error: 104 (Connection reset by peer) [21:55] jcoxon (n=jcoxon@host86-158-61-196.range86-158.btcentralplus.com) joined #highaltitude. [22:00] jcoxon (n=jcoxon@host86-158-61-196.range86-158.btcentralplus.com) left irc: "Leaving" [22:01] Laurenceb (n=laurence@host86-140-198-16.range86-140.btcentralplus.com) joined #highaltitude. [22:01] hi [22:01] http://www.kayelaby.npl.co.uk/general_physics/2_7/2_7_6.html [22:02] kind of useful... but needs a script or something to get B field vectors out [22:03] "crustal field" is the best phrase ever. [22:07] heh [22:08] thing is someones got to have written a script for doing this - I just cant find it [22:10] nothing on matlab central :-/ [22:10] tho this looks useful - http://www.mathworks.com/matlabcentral/fileexchange/24586-intoduction-to-the-gravity-field-of-earth [22:14] junderwood__ (n=John@adsl.jcu.me.uk) left irc: "Leaving" [22:14] DanielRichman (n=daniel@unaffiliated/danielrichman) left irc: "Leaving" [22:21] DanielRichman (n=daniel@unaffiliated/danielrichman) joined #highaltitude. [22:24] http://www.rapidonline.com/Electronic-Components/Optoelectronics/Miniature-Lamps/Grain-of-rice-lamp/81587/kw/ [22:24] looks good for airspeed measurement [22:25] hot wire ++ [22:25] The 1940s can't be wrong. [22:25] Or ultrasound [22:25] generate ultrasound, listen for phase shifts at a distant reciever [22:26] too complex [22:26] that bulb + simple opamp circuit and into an ADC [22:26] that is inded simple. [22:26] <20ma @3.3v [22:26] cant complain at the power use either [22:26] different inaccuracies than hot wire [22:27] IIRC you want to run them at about 0.2* rated volts [22:27] but it's been a while [22:27] 200mv or so [22:27] that makes it easy [22:28] IMO its much more suited to mini UAV use [22:28] yep. [22:28] I wish the invensys gyros were available. [22:28] pitot tubes with sensible priced and size pressure sensors are only good above 10m/s [22:28] I have had no responsed rom them to my enquiry for more info [22:28] I see [22:29] I'm thinking about a UAV board design [22:29] with an atmega - basically a sensible version of the sparkfun board [22:29] hmm [22:29] Snomi (n=Snomi@client-86-25-180-62.bkl-bng-012.adsl.virginmedia.net) joined #highaltitude. [22:31] 12mhz, cc1020 on the board, and pwm in/out, with some logic to do pwm switching [22:32] then the capability to drive an airspeed sensor and som flash for datalogging [22:32] Interesting. [22:32] and a gps socket and smps for the power [22:33] pwm for several servos I suppose? [22:33] and some unpopulated spots for open drain drivers? [22:33] 1wire? [22:34] DanielRichman (n=daniel@unaffiliated/danielrichman) left irc: "Leaving" [22:36] Snomi (n=Snomi@client-86-25-180-62.bkl-bng-012.adsl.virginmedia.net) left #highaltitude ("Leaving"). [22:43] natrium42 (n=natrium@CPE000625d867e2-CM0014045885be.cpe.net.cable.rogers.com) left irc: "Leaving" [22:54] that means annoyingly precise timing [22:54] I was thinking of running a real time executive [22:54] bbl - eating [23:07] natrium42 (n=natrium@CPE000625d867e2-CM0014045885be.cpe.net.cable.rogers.com) joined #highaltitude. [23:16] N900evil (n=Speedevi@tor/regular/SpeedEvil) left irc: Read error: 110 (Connection timed out) [23:20] SpeedEvil: same as diydrones - two 16 bit pwm channels for elevator and rudder or v tail, and one 8 bit for throttle [23:21] then some logic for switching incoming pwm from an Rx - triggered by one incoming channel going into input capture [23:21] so a sane pwm input causes it to switch to Rx control [23:21] hmm [23:22] sounds sane [23:22] 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] its how I do it on the rogallo - so just a c&p job with the code :D [23:23] maybe one of the ST I2C gyros for yaw and an invisense dual axis gyro for roll and pitch [23:28] or use the dual rate output - but theres not enough ADC inputs [23:28] Xenion (n=robert@p579FCE11.dip.t-dialin.net) left irc: "Verlassend" [23:37] I wonder if you could tie Vref outputs on two ST gyros [23:38] you mean so you only need one adc [23:39] hmm [23:39] I meant - invensys - the 3 axis i2c one that's upcoming [23:39] sure, if you can get hold of it [23:40] pity doesn't seem so. [23:40] I was thinking the ST gyros onto an atmega adc [23:40] what is the atmega adc - 12 bit? [23:42] 10 [23:44] 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] guess its not that bad [23:45] what do you mean by noise. [23:45] the short term 1/f? [23:45] the actual intrinsic gyro noise from the datasheet [23:45] 0.035degrees/sec/sqrt(Hz) [23:45] doing any filtering first? [23:47] nope, just the internal 140hz low pass [23:52] an rare case of more noise required [23:54] adc will tend to "stick" resulting in an apparent bias drift [23:57] that's what .414degrees/s noise? [23:57] guess you can clock the adc faster to get it a bit noisy [23:58] yeah [23:58] I guess the faster adc clocking will solve any problems, and have a nice side effect of speeding things up [23:58] are you actually going to be reading it at 140Hz though? [23:59] but still - three analogue gyros = three outputs and 2 vref outputs, then airspeed sensor and battery voltage [23:59] 7 adc channels and only 6 avaliable :-/ [23:59] umm. [23:59] read at 300Hz and average, run the attitude filter at 50hz [00:00] --- Tue Jan 12 2010