highaltitude.log.20090908

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[10:25] <rjharrison> Morning edmoore
[10:25] <edmoore> all: our site is down if anyone is after anything, like the predictor. A team of trained monkeys are trying to fix the server.
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[11:09] <rjharrison> Hey fergusnoble
[11:09] <rjharrison> Long time no see
[11:09] <rjharrison> Hoe you're well and enjoying the holls
[11:10] <edmoore> fergusnoble: pip down, mega fun. svn down too therefore. suggest backing up anything you have - i have got r137 backed up on DVD
[11:10] <edmoore> well, r137 + my uncommited changes
[11:11] <edmoore> srap that, back up again
[11:44] <rjharrison> bbiab
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[19:28] <rjharrison_home> Evening all
[19:28] <SpeedEvil> evening.
[19:29] <rjharrison_home> Hows it going SpeedEvil
[19:29] <SpeedEvil> Today I have not been moving tons of rock.
[19:29] <SpeedEvil> I've been moving tons of wood.
[19:29] <SpeedEvil> (well, a couple of hundred kilos)
[19:30] <rjharrison_home> Today I have not been removing mortar off bricks like day release
[19:30] <rjharrison_home> I have given myself arthritus like hands after all my hammering
[19:31] <SpeedEvil> SDS can be good.
[19:31] <SpeedEvil> a decent one that is
[20:05] <rjharrison_home> Yep I discovered the chizel function on my sds drill at 4pm on Sunday and did as many bricks in 3 hours as I did in the preceeding 1.5 days
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[21:12] <fuzzylugnuts> Hey
[21:12] <SpeedEvil> hy
[21:14] <fuzzylugnuts> I ordered 2 of those qpx1s
[21:14] <fuzzylugnuts> they were pretty cheap
[21:14] <fuzzylugnuts> 179 a pop
[21:14] <fuzzylugnuts> for a 2w vhf transciever
[21:15] <fuzzylugnuts> with built in 1200b modem
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[21:22] <SpeedEvil> :)
[21:22] <fuzzylugnuts> I is happy.
[21:26] <fuzzylugnuts> abyone mess with the overo line?
[21:26] <fuzzylugnuts> *anyone
[21:27] <SpeedEvil> gumstix?
[21:27] <SpeedEvil> naah
[21:28] <rjharrison_home> Hey fuzzylugnuts hows it going
[21:28] <fuzzylugnuts> Heya man
[21:28] <rjharrison_home> You still on the Gin :)
[21:28] <fuzzylugnuts> life is good... got bread on the table and a roof over the lot
[21:28] <fuzzylugnuts> hahaha...no
[21:28] <fuzzylugnuts> : )
[21:28] <rjharrison_home> lol
[21:29] <rjharrison_home> SpeedEvil quick question
[21:29] <rjharrison_home> anyone infact
[21:29] <rjharrison_home> my humidity sensor is a bit jumpy
[21:30] <fuzzylugnuts> part #?
[21:30] <rjharrison_home> and if I chuck a 100uF on the output it smooths it down
[21:30] <rjharrison_home> As I guess it should by making the cap > do I just slow down the rate of response?
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[21:31] <rjharrison_home> so 1000uF would just make it slow to respond
[21:31] <Matt_APEX> put a resistor and a cap to make a low pass
[21:31] <Matt_APEX> and yes
[21:31] <Matt_APEX> but a normal filter wont make it massivly slow to respond
[21:32] <rjharrison_home> Basically I have a divider to go from 5v max to 3.3v max and I have chucked a cap on the 3.3v output
[21:32] <SpeedEvil> Unless you have leakage in the cap - yes.
[21:32] <gordonjcp> rjharrison_home: kalman filter
[21:32] <SpeedEvil> the other possibility is to buffer the output of the thing with a opamp
[21:32] <gordonjcp> if it's not on fire, it's a software problem
[21:32] <rjharrison_home> Oooh a new word I'll have a google
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[21:33] <Matt_APEX> http://www.freescale.com/files/sensors/doc/app_note/AN1646.pdf its for pressure sensors but same thing applies
[21:34] <rjharrison_home> Oooh I see a job for my TDS2024b
[21:34] <rjharrison_home> I'll have a look at the signal and see how the cap affects it
[21:34] <rjharrison_home> Thanks all
[21:35] <rjharrison_home> Matt_APEX hehe I have a freecale on this circuit as it happens... A diff press sensor
[21:36] <Matt_APEX> if u construct a RC low pass, then the cut off frequency can easily be calcualted and then you know the bandwidth
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[21:45] <rjharrison_home> Matt_APEX I'll have a look into the RC low pass filters
[21:46] <rjharrison_home> Should I use a filter rather than just showing a cap in?
[21:46] <fuzzylugnuts> cap would be fine, imo
[21:46] <fuzzylugnuts> with the resistor
[21:46] <fuzzylugnuts> er
[21:47] <fuzzylugnuts> so yeah, rc filter
[21:47] <rjharrison_home> Right next question I want to calibrate the Humidity sensor
[21:48] <rjharrison_home> It should be linear ish
[21:48] <fuzzylugnuts> you can buy humidity cal kits
[21:48] <rjharrison_home> 100% humidity = my breath
[21:48] <Matt_APEX> well ur potential divider -> cap is almost like a RC, but with another resistor to gnd
[21:49] <Matt_APEX> a RC filter -> potential divider may work better tho
[21:49] <fuzzylugnuts> rjharrison_home: http://www.professionalequipment.com/kestrel-relative-humidity-calibration-kit-0824/hvac-accessories/ Expensive, but will do.
[21:50] <fuzzylugnuts> cheaper would be by secondary standard
[21:52] <Matt_APEX> u get little humidity dials in barameters or just stand alone things, could just leave it next to that, and note down a few values over a period?
[21:54] <fuzzylugnuts> rjharrison_home: I have a kestrel 4500.... if you can find someone with something similar than you're set
[21:55] <rjharrison_home> http://www.burntechshop.com/humidity-calibration-p-465.html?osCsid=264a790ed34d8ff915610174ad30aa3d
[21:55] <rjharrison_home> Can I use these more than once?
[21:56] <rjharrison_home> If so I'll buy them
[21:56] <rjharrison_home> Not really sure how to use them
[21:56] <rjharrison_home> Do you add water? Any experiance out there?
[21:57] <Matt_APEX> mm should be obvious when uve gone one infront of you
[21:57] <Matt_APEX> never seen them b4 tho
[21:58] <fuzzylugnuts> http://www.fondriest.com/pdf/extech_445582_manual.pdf
[21:58] <fuzzylugnuts> I've not used them either
[22:00] <rjharrison_home> Humm looks like the salts seem to stablise the humidity at fixed values
[22:00] <rjharrison_home> I'll buy some of these and give it a shot
[22:00] <rjharrison_home> Weird
[22:04] <SpeedEvil> You can also do stuff like make your own calibration standard.
[22:04] <SpeedEvil> A box inside a box
[22:04] <SpeedEvil> box 1 is at 20c and 100% RH
[22:04] <SpeedEvil> box 2 is at 40C and is inside box 1 - with some air gaps
[22:05] <SpeedEvil> the RH inside box 2 can be found using psychromic charts
[22:05] <fuzzylugnuts> and a hampster
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[22:05] <SpeedEvil> Sorry - I thought that was obvious.
[22:05] <fuzzylugnuts> *nod*
[22:07] <rjharrison_home> Humm You have to add water apparently
[22:14] <fuzzylugnuts> figure if its re-useable?
[22:16] <SpeedEvil> Also
[22:16] <SpeedEvil> a mirror hygrometer isn't horribly complex to mae
[22:16] <SpeedEvil> kk
[22:16] <rjharrison_home> Interesting salts seem to be a good stating point
[22:17] <rjharrison_home> I could make anhydrous copper sulphate which is good for 0% RH
[22:18] <SpeedEvil> rjharrison: also conc sulphuric is good
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[22:31] <SpeedEvil> Dew thermometer - peltier - mirror - thermometer
[22:32] <SpeedEvil> and a IRED and a photodiode
[22:38] <fuzzylugnuts> http://icanhascheezburger.files.wordpress.com/2008/05/funny-pictures-i-hate-humidity.jpg
[22:38] <rjharrison_home> fuzzylugnuts lol
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[23:06] <rjharrison_home> Right I have ordered some salts for calibration
[23:07] <rjharrison_home> it's all comming together nicely now
[23:07] <rjharrison_home> hi natrium42
[23:07] <rjharrison_home> Just off to bed
[23:07] <natrium42> yo robert
[23:07] <natrium42> g'nite then :)
[23:08] <rjharrison_home> natrium42 just been working out ways to calibrate the humidity sensor
[23:08] <rjharrison_home> going for salt baths which seem to have fixed humidity levels
[23:08] <rjharrison_home> http://www.conservationphysics.org/satslt/satsalt.php
[23:08] <natrium42> interesting
[23:09] <natrium42> maybe if you had a commercial humidity instrument
[23:09] <natrium42> you could also compare your reading to that
[23:09] <rjharrison_home> yep may see if i can beg, borrow or steal one from somewhere
[23:10] <rjharrison_home> Be good to check that the solutions are giving the correct values too
[23:11] <rjharrison_home> Right all thanks for help support and ideas in general
[23:11] <rjharrison_home> Closeing down for the night
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[00:00] --- Wed Sep 9 2009