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[00:37:25] <rue_house> zippo:/files/programming/c/fraction# ./a.out
[00:37:25] <rue_house> Best Match for 0.141592, is 5/32 = 0.156250
[00:37:34] <rue_house> oh yea, I got me a new utility app!
[00:38:00] <rue_house> put in decimal, get closest fraction
[00:44:28] <rue_house> zippo:/files/programming/c/fraction# ./a.out 0.375
[00:44:28] <rue_house> Best Match for 0.375000, is 3/8 = 0.375000
[00:44:33] <rue_house> oh yea, i'm gonna love this
[00:51:57] <rue_house> zippo:/files/programming/c/fraction# ./a.out 0.675
[00:51:57] <rue_house> Best Match for 0.675000, is 11/16 = 0.687500
[00:54:18] <rue_house> zippo:/files/programming/c/fraction# ./fraction .631
[00:54:19] <rue_house> Best Match for 0.631000, is 5/8 = 0.625000
[00:54:19] <rue_house> Error is = 0.006000
[01:22:49] <rue_bed> ooooooooh I still didn't play with a LM567
[11:07:39] <SpeedEvil> https://www.youtube.com/watch?v=CoA-m5iHG9s Do you trust your coding and robot enough to not have it spray your brains over a small child?
[11:11:27] <ace4016> safety was not number 1 in this video
[11:19:44] <z64555> reminds me a joke my dad told me
[11:19:57] <z64555> A group of professors were invited onto a plane
[11:20:10] <z64555> They were then told that the plane had been built by their students
[11:20:26] <z64555> all of them, except for one, quickly got off the plane
[11:20:57] <z64555> When asked why he didn't leave with the others he said he was "confident that the plane wouldn't even start"
[11:21:27] <robopal> :-)
[11:24:52] <blib> SpeedEvil: any progress on your project? :)
[11:25:09] <SpeedEvil> no
[11:25:12] <blib> SpeedEvil: is that motherboard hackable?
[11:25:20] <SpeedEvil> what motherboard
[11:25:36] <ace4016> lol z64555
[11:25:43] <blib> SpeedEvil: hoverboard -control board
[11:25:50] <SpeedEvil> The processor is, yes
[11:26:05] <SpeedEvil> http://beta.ivc.no/wiki/index.php/Electric_Hoverboard_Monorover_R2_Teardown
[11:53:12] <blib> SpeedEvil: how did they manage an ESC on 36v with $50?
[11:53:37] <blib> SpeedEvil: what can that motherboard run? RAM ?
[12:07:30] <SpeedEvil> Mass production
[12:07:35] <SpeedEvil> the processor has a few K
[18:09:38] <delinquentme> Hi all. Im powering an arduino with a raspberryPi via USB ... that arduino is connected up to a LM35 themperature sensor. Earlier today everyting was working as expected but I've since installed a RTC for the rapsberryPi
[18:09:58] <delinquentme> And now the corresponding readings Im getting off the LM35 have become much noisier.
[18:10:49] <delinquentme> The lm35 as it stands has a RC snubber which had quieted down a noisy signal issue we had prior
[18:31:46] <z64555> RC snubbe... pesumably that's in the low-pass configuration, yes?
[18:32:02] * z64555 checks his 'r' key
[18:32:24] <codepython777> z64555: what are you working on today?
[18:33:14] <z64555> Well, trying to work on some PR's for an open-source game engine
[18:33:25] <z64555> but I'm rather tired
[18:37:14] <delinquentme> z64555, in that the capacitive load is connected up to ground
[18:37:19] <delinquentme> then yes.. i think
[18:41:13] <z64555> https://upload.wikimedia.org/wikipedia/commons/thumb/3/3b/RC_Divider.svg/200px-RC_Divider.svg.png
[18:41:31] <z64555> like that, or with the R and C reversed?
[18:44:56] <z64555> not knowing the nature of the noise from the rtc, i can only guess
[18:46:04] <z64555> it might be a high-freq noise that is reduced by the filter, but is too close to the filter's cutoff freq to be any good
[18:46:34] <z64555> or it might be a lower freq noise that is right at or below f_cutoff
[20:49:04] <rue_house> nothing like a 2547 page book to search for soemting thru
[20:49:42] <orlock> Current Trends in Theoretical Computer Science?
[21:28:48] <orlock> What book?
[21:30:08] <Jak_o_Shadows1> probably a adatahsset :P
[21:58:51] <rue_shop4> machinists handbook
[21:59:04] <orlock> Ahh, good stuff.
[21:59:41] <DagoRed> I love that book. I have 3 early editions including a first edition.
[22:00:14] <orlock> Machinists or Machinery?
[22:00:33] <DagoRed> Machinists
[22:00:41] <orlock> https://en.wikipedia.org/wiki/Machinery's_Handbook
[22:01:07] <orlock> https://en.wikipedia.org/wiki/American_Machinists%27_Handbook
[22:01:51] <DagoRed> The latter.
[22:02:14] <DagoRed> I think...
[22:02:31] <orlock> the first one is big - several volumes?
[22:13:23] <DagoRed> orlock: yes
[22:13:50] <DagoRed> The log tables and their table of prime numbers saved my ass when I was elementry school.
[22:42:25] <z64555> ...elementry?
[22:42:30] * z64555 feels dumb
[22:42:50] <orlock> Damn
[22:43:04] <orlock> i just got about 10kg of Nema23 Portescap steppers
[22:43:17] <orlock> that was all that was in arms length
[22:43:26] <orlock> Only 1.8deg though
[22:43:28] <DagoRed> z64555: yeah... grandfather was a mechanical engineer with a full machine shop in the basement.
[22:43:39] <orlock> they were all in the scrap metal bin..
[22:43:42] * z64555 envy intensifies
[22:43:49] <orlock> i should give them a spray with bleach when i get home
[22:44:08] <DagoRed> z64555: father's an electrical engineer on hard drives. I was running a lathe and soldering from the age of 6.
[22:44:51] <z64555> I tried chomping a soldering iron when I was like 2. That set me back a few years
[22:45:13] <z64555> I have no memory of the incident, but I do respect the iron
[22:45:19] <orlock> Was it on?
[22:45:22] <z64555> yes
[22:45:44] <orlock> ouch
[22:45:51] <z64555> burned my right cheek on the outside
[22:46:39] <z64555> My grandad was a Navy machinist, he had a machine shop in his barn
[22:46:44] <orlock> http://media.comicbook.com/2016/03/twd-dwight-175197.jpg
[22:46:50] <DagoRed> z64555: nice
[22:46:58] * DagoRed still at work
[22:46:59] <z64555> My dad got to mess with the machinery, but I never did
[22:47:10] <DagoRed> IT + climate science computing is a bitch!!!
[22:47:41] <DagoRed> z64555: my grandfather had me working on model A restorations with friends at the age of 6.
[22:47:52] <DagoRed> He was BIG into antique cars.
[22:48:04] <orlock> Small hands goof for snding in those nooks and crannys?
[22:48:14] <orlock> good for sanding
[22:48:17] <DagoRed> yeah
[22:48:43] <DagoRed> orlock: are you enjoying watching Assange still stuck in the Embassy any chance?
[22:50:29] <orlock> DagoRed: Yup. Though i think he's enjoying it on some level
[22:52:02] <mbrumlow> Anybody want to give my press and hold controls a shot? (I had lots of complaints, with the press and go controls)?
[22:52:06] <orlock> What would a "SSR" test for steppers be?
[22:52:12] <DagoRed> I think he wants out. He likes the god like status the freedom people in the states are stating.
[22:52:15] <mbrumlow> Looking for feedback on maybe a better system.
[23:15:08] <z64555> orlock: SSR? Steady State Response?
[23:17:39] <orlock> Looks like that would be it
[23:17:52] <orlock> SOme of these Nema23's say "passed torque test, failed SSR"
[23:18:35] <orlock> i managed to grab a few dozen - all that was in arms reach
[23:21:25] <z64555> I'm, not sure.
[23:21:37] <z64555> It could mean holding position under load
[23:22:20] <orlock> They got a litle spattering of rain as well, not soaked though - hope they are ok
[23:22:59] <Jak_o_Shadows1> well, steppers don't have brushes or anything
[23:23:33] <orlock> yup, no vents either
[23:30:17] <z64555> what would bleach do?
[23:30:30] <z64555> wouldn't that make it rust worse?
[23:32:59] <orlock> z64555: I work at a biotech robot manufacturer..
[23:33:04] <orlock> specifically pathology robots
[23:33:12] <z64555> Ohhhh.
[23:33:16] <z64555> Yeah.
[23:33:25] <z64555> That would explain the acid bath
[23:33:35] <orlock> They all look clean and everybodys very carefull, but it's alwasy at the back of my mind heh
[23:34:18] <orlock> I'm sure if there had been any risk of contatc they would have been throuh decontamination procedures
[23:34:44] <z64555> better safe than being patient zero
[23:35:10] <z64555> I'm sorry if that statement will cause you to lose sleep
[23:35:13] <z64555> :(
[23:35:45] <orlock> Heh, nah - there's a good chance it didnt even come from somethign that handles tissue
[23:35:54] <orlock> we also do contract manufacture of other robots
[23:36:18] <orlock> and by robots, i mean expensive and high end medical (or otherwise FDA aprooved) type devices
[23:37:18] <z64555> Have I mentioned how much I envy people in this channel?
[23:37:39] <orlock> I'm lucky to work here
[23:38:07] <orlock> I;ve been here 18 months - Never checked that bin before!
[23:38:27] <orlock> one of the desktop techs just said if i wanted steppers to check it out
[23:39:13] <orlock> z64555: Hows this.. my hobby is astrophotography. The "Brand" that i work for is most famous for cameras and camera lenses
[23:39:23] <orlock> .. They dont make cameras anymore!
[23:40:05] <z64555> to be fair, cameras these days don't use film anymore
[23:40:33] <z64555> and image processing can be _very_ intense
[23:41:26] <orlock> I just want some nice glass. I'm using Pentax gear from the 70's
[23:41:47] <Jak_o_Shadows1> Well, that's 20 crimped joints that I didn't remember I would be doing when I didn't buy the crimping tool in the store yesterday
[23:41:53] <z64555> no trouble with distortions?
[23:42:01] <z64555> glass is a fluid, ya know
[23:42:18] <orlock> z64555: Pretty ure that one's been debunked
[23:42:42] <orlock> They just used to be crap at making glass flat
[23:42:48] <orlock> and installed it thick side down
[23:43:10] <z64555> True, but IIRC, the thick side has gotten thicker over the years
[23:43:17] <Jak_o_Shadows1> To be fair, i'd be bad at making glass today
[23:43:20] <orlock> because that's the logical way to install imperfect glass
[23:43:38] <z64555> eh, that's the safe way
[23:43:52] <z64555> The thicker glass is stronger, so you can pivot it in a bit better
[23:44:27] <z64555> Jak_o_Shadows1: what they'd do is take a big bubble, cut it open, then roll it out on a table
[23:44:59] <z64555> The thick part was the first bit of glass that hit the table, the rest being stretched out
[23:45:06] <orlock> z64555: Astro imaging actually takes the data as raw as possible (for the dedicated imaging devices annyway)
[23:45:58] <Jak_o_Shadows1> I have to play around with taking photos of the stars at some point
[23:46:02] <Jak_o_Shadows1> in the new year I think
[23:46:03] <orlock> they look fucking horrible straight from the sensor - pretty much noise
[23:46:10] <Jak_o_Shadows1> Gotta work out how big a dots the stars are in the image
[23:46:16] <orlock> gotta apply darks and flats and sort out colours
[23:46:16] <Jak_o_Shadows1> (from theoretical clculations)
[23:46:21] <z64555> Jak_o_Shadows1: nowadays, glass panels use a process similar to extrusion
[23:46:42] <z64555> or I might be thinking of something else
[23:47:24] <z64555> Interestingly
[23:47:42] <z64555> Shaped sugar products are treated the same way as glass
[23:48:11] <z64555> orlock: Yeah, I've gotten a cheap-o digital camera
[23:48:32] <z64555> the pics it had was horrible looking, lots of noise
[23:49:17] <z64555> If I wanted anything good out of it, I'd have to snap a picture of a test card
[23:49:33] <z64555> and use that in photoshop
[23:53:07] <orlock> z64555: Theres unpredicatble noise, and then theres the predictable stuff due to bad pixels
[23:53:25] <orlock> z64555: Cameras these days automatically remove the "predictable" noise.. the astro cameras done
[23:53:26] <orlock> dont
[23:53:40] <orlock> and unpredictable noise is often temperature related
[23:53:43] <z64555> I wonder why that is
[23:53:45] <orlock> so they cool them with peltiers
[23:53:55] <z64555> the predictable noise filtering, that is
[23:54:09] <z64555> *why they don't filter
[23:54:46] <orlock> It's done, it's just done after collection
[23:54:50] <orlock> because Science.
[23:55:21] <orlock> so they can say raw data + a pile of maths is done + these filters + etc
[23:55:36] <orlock> rather than having maths done to the raw data and getting that manipulated data
[23:56:16] <orlock> dark frame subtraction and flat frame correction are the two big ones
[23:56:25] <orlock> dark frame = picture with the lense cap on
[23:56:49] <orlock> so the only data is the "noisy" pixels
[23:56:53] <z64555> and flat frame is bright-white?
[23:57:07] <orlock> flat frames are to correct vingetting due to uneven distribution of light across the sensor
[23:57:38] <z64555> so a card with some black and white pattern on it
[23:57:44] <orlock> nah, flat white
[23:57:49] <z64555> huh.
[23:58:00] <orlock> but you lower the exposure time till the exposure is grey
[23:58:21] <orlock> it also corrects for dust on the sensor, etc
[23:59:29] <orlock> http://somepicturesof.space/ANtaresbleh.jpg - I fucked up the flat frame on this one
