--- Log opened Tue Mar 31 00:00:38 2015
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01:09 < nmz787_i1> http://www.zdnet.com/article/intels-next-big-thing-knights-landing/
01:12 < nmz787_i1> sheena: they could have done better: http://www.zdnet.com/article/intels-next-big-thing-knights-landing/
01:12 < nmz787_i1> sheena: I mean http://hackaday.com/2015/03/31/fail-of-the-week-easy-cheese-printer-says-no/
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04:24 < ButaTine> looks interesting: http://sourceforge.net/projects/visage-hci/
04:26 < chris_99> i've used something exactly like that
04:26 < chris_99> or possibly that
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07:04 < chris_99> does anyone recall the openspectrometer website
07:04 < chris_99> of nmz787's
07:05 < thundara> It was linked as http://www.openspectrometer.com/ on the github repo ( https://github.com/nmz787/open-spectrometer )
07:05 < thundara> But it looks like that's down now
07:05 < chris_99> ah cheers, i just rememebered he wrote some stuff up on HaD.io - http://hackaday.io/project/1342-open-spectrometer
07:06 < CaptHindsight> was that the prism and webcam version?
07:06 < chris_99> it uses a toshiba linear chip
07:06 < thundara> Did anyone ever build it?
07:06 < chris_99> i think he did build it
07:06 < CaptHindsight> if built right it will work
07:06 < chris_99> i want to build something similar for doing NIR stuff to measure alcohol
07:07 < CaptHindsight> what bandwidth?
07:07 < chris_99> http://www.hindawi.com/journals/jamc/2012/728128/ - i need around 900mm to around 1000n
07:07 < chris_99> *nm
07:07 < paperbot> http://libgen.info/scimag/get.php?doi=10.1155%2F2012%2F728128
07:07 < chris_99> so it's still a silicon chip
07:09 < CaptHindsight> what's the story on a greed gene?
07:09 < CaptHindsight> how much is nature vs nurture?
07:09 < CaptHindsight> and can we get a virus to target it?
07:12 < CaptHindsight> chris_99: http://www.hamamatsu.com/us/en/S11510-1106.html
07:12 < chris_99> that would still need a grating right?
07:12 < chris_99> i've seen the sony one those dudes, use for $13
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07:13 < CaptHindsight> you have to break up the light somehow
07:13 < chris_99> some have in-built gratings
07:13 < CaptHindsight> depends on the linearity you want
07:13 < CaptHindsight> will it work, yes, how well is another story
07:13 < chris_99> mm heh
07:14 < chris_99> i'd definitely attempt to calibrate it
07:14 < chris_99> too
07:14 < kanzure> "Brain-wide analysis of electrophysiological diversity yields novel categorization of mammalian neuron types" http://jn.physiology.org/content/jn/early/2015/03/20/jn.00237.2015.full.pdf
07:14 < kanzure> http://neuroelectro.org/
07:14 < kanzure> "The goal of the NeuroElectro Project is to extract information about the electrophysiological properties (e.g. resting membrane potentials and membrane time constants) of diverse neuron types from the existing literature and place it into a centralized database."
07:15 < kanzure> https://www.youtube.com/watch?v=BucMrSUy0I8
07:16 < kanzure> .title http://www.neuroelectro.org/neuron/85/
07:16 < yoleaux> NeuroElectro :: Hippocampus CA1 pyramidal cell
07:17 < kanzure> and then they link to software implementations of each cell type <3
07:18 < CaptHindsight> will they discover the A-Hole neuron?
07:19 < kanzure> they are all asshole neurons
07:19 < kanzure> every last one of them
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07:32 < chris_99> http://hackaday.com/2015/03/31/measure-as-little-as-you-want-with-openqcm/
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08:04 < chris_99> blinking heck, diffraction gratings are expensive
08:07 < archels> "Oral session on Omics"
08:07 < archels> oh goodie, I can't wait
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09:02 < nmz787_i1> chris_99: if you don't want to compare your measurements to other spectrometers... linearity of the grating shouldn't really matter
09:02 < nmz787_i1> and in that case a cheap grating should work fine
09:02 < chris_99> oh, what grating did you use though btw?
09:02 < chris_99> i can't really find any cheap ones
09:02 < nmz787_i1> it makes more difference in the UV since plastics (cheap gratings) absorb UV
09:03 < chris_99> i was just looking at http://www.edmundoptics.co.uk/optics/gratings/near-ir-nir-reflective-gold-gratings/46080/
09:03 < nmz787_i1> I have a chinese concave flat-field-corrected reflectance grating
09:03 < chris_99> oh, where did you get it from?
09:03 < nmz787_i1> any of the cheap $10 grating sheets should do the trick for you I htink
09:03 < nmz787_i1> aliexpress or alibaba
09:04 < nmz787_i1> I think you may have asked about FTIR yesterday, and I have an old FTIR machine that doesn't do much more than boot up and turn it's laser and voice-coil on
09:04 < chris_99> yeah i was looking at the hammatsu ftir mems stuff
09:05 < chris_99> but it seems like i can do it with shorter wave NIR
09:05 < chris_99> from that chinese paper
09:05 < chris_99> also i was wondering , i noticed you used a 16 bit ADC, could i use 24 bit or something, for more precision
09:06 < chris_99> or is that pointless for some reason
09:06 < nmz787_i1> yes, but the design of the board will need a lot more work
09:06 < nmz787_i1> otherwise the extra bits are useless
09:06 < chris_99> mm, i've used a 24 bit adc with a loadcell before, although that was only low sps
09:06 < nmz787_i1> also more data could mean less overall framerate (i had been targeting 60FPS)
09:06 < chris_99> ah framerate doesn't matter much for me
09:06 < nmz787_i1> the ADC needs to be at least 1 or 2MHz
09:07 < nmz787_i1> err, maybe it was 500 kHz
09:07 < chris_99> so did you have to use any lenses between the grating or infront of it btw?
09:07 < nmz787_i1> http://www.amazon.com/Diffraction-Grating-sheet-Linear-Inches/dp/B007G0J1RU/ref=sr_1_fkmr0_1?ie=UTF8&qid=1427818044&sr=8-1-fkmr0&keywords=transmission+grating+film
09:07 < chris_99> heh i've seen that
09:08 < nmz787_i1> that's the beauty of the flat-field-corrected grating, is that it is already curved so absorbs the function of lenses/mirrors
09:08 < nmz787_i1> but that's mainly to increase linearity of wavelength to pixel-spacing
09:08 < chris_99> ah ok, is there a gap though between the grating and your sensor
09:09 < nmz787_i1> so if you have some lasers to calibrate with, and don't want to compare to others (only compare now and then of your own measurements) then linearity becomes less important
09:09 < nmz787_i1> yep
09:11 < chris_99> how about http://www.alibaba.com/product-detail/High-diffraction-efficiency-diffraction-grating_60104576100.html
09:12 < chris_99> oh is http://www.alibaba.com/product-detail/high-diffraction-efficiency-blazed-concave-grating_60186045792.html the kind you meant
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09:14 < kanzure> 09:13 <kanzure> i don't think anyone is stress testing keyboards appropriately
09:14 < kanzure> 09:13 <kanzure> on one of my keyboards i estimate that i have put in at least 100 million keystrokes
09:15 < kanzure> 09:14 <kanzure> 100 million keystrokes is only like 10k words per day for 5 years
09:15 < kanzure> 09:14 <kanzure> keyboards should be stress tested to 5-10 billion keystrokes
09:15 < kanzure> anyway, yet another keyboard is fallig apart on me
09:15 < nmz787_i1> chris_99: yeah... looking for the company i got mine from... can't login to alibaba here though (password store not with me)
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09:15 < nmz787_i1> but searching the email addresses I have, I found this article
09:16 < nmz787_i1> paperbot: http://rd.springer.com/article/10.1007%2Fs11801-008-7140-5
09:16 < nmz787_i1> the company name was something -vac I think
09:17 < chris_99> did you use a mirror to reflect the diffraction pattern to the sensor, as that's what the folks in this paper seemed to do
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09:18 < paperbot> http://diyhpl.us/~bryan/papers2/paperbot/9d9c463bf71393c6e817b133414b1f38.txt
09:20 < chris_99> ooh sweet just found a dude selling 5x sensors for $25
09:20 < chris_99> inc. shipping
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10:05 < chris_99> http://www.aliexpress.com/item/Free-shipping-5pcs-TCD1304AP-TCD1304-CDIP22-Best-quality/1887814216.html
10:05 < chris_99> should anyone want some
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10:37 < kanzure> http://pepijndevos.nl/2015/03/30/tcpoke-private-beta.html "TCPoke is my project that connects Game Boys over the internet to battle and trade with first and second generation Pokemon games. Today the last parts for the TCPoke shield arrived, enough parts to make 9 test boards. I plan to give these away to people who can contribute to the project."
10:38 < kanzure> "The gist of it is that a Teensy puts the Game Boy in slave mode and forwards the data over USB HID to a Chrome App that uses WebRTC to transfer the data over the internet."
10:38 < chris_99> heh
10:38 < kanzure> :/
10:39 < chris_99> have you seen the things that convert the GB/NES output to HDMI
10:39 < chris_99> from the display memory
10:41 < kanzure> no
10:41 < kanzure> does it use webrtc? :\
10:43 < chris_99> https://www.youtube.com/watch?v=QnQuBN3iYVA
10:43 < chris_99> no
10:44 < kanzure> dea/bitcoin exhibit b http://i.imgur.com/FxxXma3.png
10:45 < chris_99> http://blog.kevtris.org/blogfiles/hdmi/hdmi_proto_4.JPG
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11:18 < kanzure> https://www.techdirt.com/articles/20150330/13592030490/federal-agents-investigating-silk-road-accused-stealing-bitcoin-abusing-govt-power-issuing-fake-subpoenas.shtml
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11:54 < heath> i need a smaller battery http://i.imgur.com/6BXF9oC.jpg
11:54 < heath> need to open the tile and see what they are using
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11:55 < nmz787_i1> this seems pretty decent for windows (works and no apparent spyware) https://github.com/nixxquality/WebMConverter
11:56 < heath> another comparison pic http://i.imgur.com/dYAqilC.jpg
11:56 < nmz787_i1> crazy to see spyware/malware infected stuff on sourceforge :( http://sourceforge.net/projects/camstudio/
11:57 < chris_99> what is it heath
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11:59 < chris_99> there is source in that repo interestingly nmz787_i1
12:01 < heath> chris_99: it's just a bluetooth low energy board with a gigantic battery on it
12:01 < chris_99> aha
12:02 < chris_99> https://store.openqcm.com/ -- im just looking at this, it has a microfluidic cell in it so you could measure liquids extremely accurately
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12:07 < nmz787_i1> chris_99: the mercurial link? I just saw that
12:08 < chris_99> the one you said theres spyware in
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12:15 < chris_99> nmz787_i1, you probably didn't see the aliexpress link i posted before http://www.aliexpress.com/item/Free-shipping-5pcs-TCD1304AP-TCD1304-CDIP22-Best-quality/1887814216.html should you need lots more of those sensors
12:26 < nmz787_i1> :) I checked the logs
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12:26 < nmz787_i1> thanks
12:26 < nmz787_i1> need to get my spectrometer board soldered up finally.... especially now that I have something to compare directly with
12:26 < chris_99> do you use a mirror btw, with your grating?
12:27 < nmz787_i1> the class I was in from Jan til like 2 weeks ago stole all my time... and now i'm in the process of moving which has all my stuff packed or getting packed
12:27 < nmz787_i1> nah, that's the beauty of the concave flat-field corrected grating
12:27 < chris_99> i'm confused why they use on in that paper
12:27 < chris_99> then
12:27 < nmz787_i1> all the optical elements are combined into one element
12:27 < chris_99> and that is concave
12:27 < chris_99> too
12:28 < nmz787_i1> http://www.gratinglab.com/Information/Handbook/Handbook.aspx
12:28 < nmz787_i1> oh, wait a sec, that isn't digital copy
12:28 < chris_99> heh
12:29 < nmz787_i1> http://www.gratinglab.com/Information/Technical_Notes/TechNote3.aspx
12:29 < nmz787_i1> fig 2 is what I have
12:29 < nmz787_i1> and what is recommended for raman spectroscopy
12:29 < nmz787_i1> one of the methods recommended for raman at least
12:30 < nmz787_i1> something about the higher orders not interfering as much
12:30 < chris_99> ah just to make sure i understand the light hits the grating gets reflected and then hits the sensor
12:30 < nmz787_i1> looks like this is a printout of that site before they took down the manual contents http://www.cientificosaficionados.com/libros/Diffraction%20Grating%20Handbook.pdf
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12:31 < nmz787_i1> 'reflected' but called diffracted
12:31 < chris_99> see i always thought light passed through the diffraction grating
12:31 < nmz787_i1> they're sort of the same thing, but I think using one or the other depends on how complex the surface the light interacts with is
12:31 < chris_99> how come its sort of reflected in this instance
12:32 < nmz787_i1> reflective vs transmissive
12:32 < chris_99> ah
12:32 < nmz787_i1> transmissive can filter light
12:33 < nmz787_i1> usually a reflective prism is coated with a metal, so it's got a mirror like finish
12:33 < chris_99> ah so it's almost like theres a grating in front of a mirror
12:33 < nmz787_i1> but then you can combine them to make a grism
12:33 < nmz787_i1> :D
12:33 < nmz787_i1> .wik grism
12:33 < yoleaux> "A grism (also called a grating prism) is a combination of a prism and grating arranged so that light at a chosen central wavelength passes straight through. The advantage of this arrangement is that one and the same camera can be used both for imaging (without the grism) and spectroscopy (with the grism) without having to be moved." — http://en.wikipedia.org/wiki/Grism
12:33 < chris_99> haha weird
12:34 < nmz787_i1> a grating is basically taking advantage of reflection, but then the spacing and texture adds more constructive/destructive wave effects
12:35 < nmz787_i1> while transmission is more like a complex lens
12:35 < chris_99> that makes sense, i'll look through the book you linked too
12:35 < nmz787_i1> still has the grating features, but instead of the light bouncing off at angles... it lenses at different angles
12:36 < chris_99> so that's essentially all you need, a sensor and a concave diffraction grating, no other lens stuff?
12:37 < nmz787_i1> I think for your case you don't need anything but a transmission grating that doesn't absorb NIR, and a sensor (webcam probably would work)
12:37 < nmz787_i1> then just watch your data for the peak/peaks that change with alcohol conc
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12:38 < chris_99> one thing i'm not sure about is the light source though
12:38 < nmz787_i1> the mirrors/lenses are only for linearity correction, and focus. If blurring is a problem then you would need some mirrors/lenses
12:38 < nmz787_i1> but you could always tune the focus so it's good enough at NIR, and blurs outside that range
12:38 < nmz787_i1> since you mainly care about NIR
12:38 < chris_99> ah yeah
12:38 < chris_99> they say 'The design relied on a tungsten lamp enhanced by light emitting diodes'
12:39 < nmz787_i1> heh
12:39 < nmz787_i1> yeah I'd think you could just use some LEDs
12:39 < chris_99> heh
12:39 < chris_99> yeah i guess i should start simple
12:39 < nmz787_i1> you'd need to take the IR filter off the webcam
12:40 < nmz787_i1> have you seen the PLOTS spectrometers?
12:40 < chris_99> nopey
12:40 < nmz787_i1> they aren't much from a scientific standpoint, but they get some results... the webcam they ship is almost junk IMO
12:40 < chris_99> isn't the problem with webcams, is they normally haver a bayer array
12:41 < chris_99> not b&w
12:41 < nmz787_i1> http://www.tech-led.com/product/nir-led/
12:42 < nmz787_i1> yeah, that will just reduce your signal though... unless your signal is really really weak
12:42 < chris_99> true
12:42 < chris_99> are you linking to that led as something to calibrate with?
12:49 < nmz787_i1> calibrate or use for source light
12:49 < nmz787_i1> should give you an idea of common wavelengths
12:49 < chris_99> ah yeah, its a shame it's not a bit lower
12:50 < nmz787_i1> you'll find a lot more NIR LEDs than UV LEDs, and for a LOT LOT cheaper than UV
12:50 < chris_99> cool
12:50 < chris_99> i just had a look at some ADCs turns out the 24 bit fairly high SPS aren't too cheap
12:50 < chris_99> http://uk.farnell.com/webapp/wcs/stores/servlet/Search?catalogId=15001&langId=44&storeId=10151&categoryId=700000004355&st=adc&pageSize=25&showResults=true&pf=110121713,110177616,110187818,110202873
12:52 < nmz787_i1> yeah and verifying the board works is a challenge... high-quality super-low-noise power supplies are not cheap at all... even with a battery you can see chemistry-related noise on a 24-bit ADC
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12:54 < chris_99> heh, interesting, not heard of noise like that
12:55 < chris_99> i imagine you'd need capacitors across each power line to each chip, and split analog/digital lines
12:56 < nmz787_i1> analog design is a lot to think about
12:56 < nmz787_i1> all simple stuff when it comes down to it
12:56 < nmz787_i1> but lots of simple stuff adds up to lots to keep in mind while designing
12:56 < chris_99> yeah
12:57 < chris_99> i need to buy art of electronics, as i dont' really have a good electronics book
12:57 < chris_99> atm
12:57 < nmz787_i1> they just released a new version, or announced that they're releasing a new one
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12:57 < chris_99> mmm they did indeed
12:57 < nmz787_i1> should be good/better... the older one is like a sleeping pill for me ;)
12:58 < chris_99> haha
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12:58 < nmz787_i1> this guy has good advice that seems to sum up most of what I read from other various sources
12:58 < nmz787_i1> http://www.hottconsultants.com/techtips/pcb-stack-up-1.html
12:58 < nmz787_i1> http://www.hottconsultants.com/tips.html
12:59 < nmz787_i1> i.e. this http://www.hottconsultants.com/techtips/split-gnd-plane.html
13:00 < nmz787_i1> essentially you have to think like an electron... they like going in straight lines, and if you make them do otherwise, they radiate
13:02 < chris_99> cheers they look good pages
13:03 < chris_99> i got the free book from http://www.emcfastpass.com/main/
13:03 < chris_99> which i need to read through too
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13:58 < FAMAS> run folding@home to help humanity in the medical sector
14:06 < kanzure> that's not what you're doign
14:06 < kanzure> nice try
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14:48 < nmz787_i1> http://www.crtsite.com/index.html
14:48 < nmz787_i1> .title
14:48 < yoleaux> The Cathode Ray Tube site, scientific glassware.
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17:27 < dpk> paperbot: http://dl.acm.org/citation.cfm?id=1412230
17:29 < paperbot> ConnectionError: HTTPConnectionPool(host='libgen.info', port=80): Max retries exceeded with url: /scimag/librarian/form.php (Caused by <class 'socket.error'>: [Errno 110] Connection timed out) (file "/usr/local/lib/python2.7/dist-packages/requests/adapters.py", line 375, in send)
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18:41 < fenn> hmm some neat  features here http://blendercam.blogspot.de/
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21:20 < kanzure> fenn: since reading the entirety of wikipedia is out of the question, how about just all of the first sentences?
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--- Log closed Wed Apr 01 00:00:39 2015