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Arduino: More Analog In? by Pez - Sun, 15 Mar 2015 16:56:40 EST ID:xfGCXuR4 No.6658 Ignore Report Reply Quick Reply
File: 1426453000836.jpg -(786482B / 768.05KB, 1297x708) Thumbnail displayed, click image for full size. 786482
Yo, I'm making a MIDI sequencer using an arduino mega. As standard it's got 16 analog inputs. However, the sequencer I'm making has 16 steps, and I want each to have it's own frequency knob as well as velocity knob, and there may be a couple more needed elsewhere on the controller, so I'm looking at 32+ analog ins.
I've seen I could get a multiplexer to increase inputs, but from what I understand I'd have to first select the knob I wanted to control and only then the value would be read. Whereas what I want is for the changes to be instantaneous, so I could change several knobs at the same time without having to select them. Anyone got any advice on this? I'm stumped.
>>
Albert Mommlelet - Sun, 15 Mar 2015 19:40:27 EST ID:JFQ3oC7N No.6659 Ignore Report Quick Reply
>>6658
Let's say the arduino did have more analog inputs. Say 32 or 64. You could connect all your inputs simultaneously, but think about your code: you've still got to read an input, do an action, go to the next input, and so on, so it's never truly instantaneous. You're going through a loop, and hitting every input along the way. Maybe the loop executes 100 times per second, so there's a .01 sec delay, at most, from your knobs. If it happens that you have to multiplex your inputs, this may add, say 1ms on top of whatever else is going on. It won't be instant, but for all intents and purposes, you'll likely not notice the time delay.

If you find that you need something truly simultaneous, the arduino probably will not do. Why? Because it works sequentially. It can look at an input, do something, and then do the next thing. A musical instrument, of course, can multitask: all the strings on a harp can vibrate independent of one another. If you find that you absolutely need this type of processing, the arduino may limit you. First, it is fast, but not breathtakingly so, and second, because it cannot process inputs in parallel.

There are two types of chips, called DSPs and FPGAs, which are more suited to high speed processing of many inputs. They are very different to program than the arduino, but they do find use in high-end audio applications.

That being said, I think the arduino, plus a multiplexer, will be more capable than you're inclined to believe, for sequencing MIDI. Multiplexers can work extremely quickly, and interface readily with the arduino.
>>
George Fopperworth - Sun, 15 Mar 2015 19:44:03 EST ID:7JSxEYqU No.6660 Ignore Report Quick Reply
This should actually be pretty easy.
Simply group the potentiometers into groups of 16s and switch their supply voltage/ground voltage pins between +5V/0V and floating respectively.
All it should take is one npn and one pnp transistor per pair and a gpio pin.
>>
George Fopperworth - Sun, 15 Mar 2015 19:48:51 EST ID:7JSxEYqU No.6661 Ignore Report Quick Reply
just figured just npns should be fine wired correctly.

If it's not clear you measure pot groups in turns.
>>
George Fopperworth - Sun, 15 Mar 2015 19:55:39 EST ID:7JSxEYqU No.6662 Ignore Report Quick Reply
oh and you won't get the full 10 bit range because of the voltage drop with the same power supply, it won't hardly matter though, since all you need is 7 bit.
>>
Pez - Mon, 16 Mar 2015 04:42:32 EST ID:xfGCXuR4 No.6663 Ignore Report Quick Reply
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Cheers guys. Feel a bit dumb now for not realising this


cell phones by Nigel Humbleforth - Mon, 09 Feb 2015 20:00:06 EST ID:fN3OkH88 No.6636 Ignore Report Reply Quick Reply
File: 1423530006917.gif -(43189B / 42.18KB, 808x430) Thumbnail displayed, click image for full size. 43189
anyone know how the fuck they like work?

what invisible wireless wave is being transmitted, how is it being bounced around, how is voice channeling through it....someone explain in laymans terms.

do you need a degree in mathematics to get into it?
1 posts and 1 images omitted. Click Reply to view.
>>
Thomas Bushstudging - Wed, 11 Feb 2015 18:48:36 EST ID:fN3OkH88 No.6639 Ignore Report Quick Reply
>>6637
seems like you're mad
>>
Lillian Hinderchin - Thu, 12 Feb 2015 22:57:49 EST ID:fhxpLWJu No.6640 Ignore Report Quick Reply
>>6637
lol i imagine this board like a club house with a couple of people cobwebs growing n shit and when newcomers come the people just scoff and shoo and scare them away

nb cus shitty board and im an engineer, and this thread is already on top
>>
Hugh Fobblehere - Fri, 06 Mar 2015 05:07:08 EST ID:jhx2sN62 No.6652 Ignore Report Quick Reply
>anyone know how the fuck they like work?
They don't. In fact they hate work.They are all wage slaves, doing 24/7 shifts with no inspiration, no joy, no soul. Every time you play candy crush with them you crush their will to live a little bit more.
>>
Nathaniel Worthingdale - Thu, 12 Mar 2015 00:38:22 EST ID:0sTD210V No.6655 Ignore Report Quick Reply
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>>6652
I like this guy!
>>
Phineas Sandernone - Fri, 13 Mar 2015 14:17:03 EST ID:l5K6dQD4 No.6656 Ignore Report Quick Reply
>>6640

Or maybe they just don't want people coming in here asking retarded questions. "How do cell phones work" is kind of a retarded question, because it so vague. Now if you wanted to know something specific, like how 64QAM encoding works, or how radio resource controllers work, or how the 3GPP core network operates, then maybe you'd get better responses. Cell phones are massively complicated systems with lots of moving parts, to break it down into "lay man's terms" is a bit more complicated than coming in here and feeling entitled to get a helpful answer from a bunch of strangers on the internet about a question that was too vague to be answered in the first place.

tl;dr google a little bit before coming here and making yourself look like a retard


Smart grid by Ernest Smallfield - Fri, 12 Dec 2014 19:25:12 EST ID:JMPcUwP+ No.6591 Ignore Report Reply Quick Reply
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Google is going to take over the electrical grid if the current grid operators don't get their shit together
>>
Fanny Wappercocke - Sun, 14 Dec 2014 01:05:18 EST ID:RHrdZjYH No.6592 Ignore Report Quick Reply
What about the potential grid operators?
>>
Samuel Duckwill - Sun, 14 Dec 2014 11:51:37 EST ID:FJ+CwDYK No.6593 Ignore Report Quick Reply
Smart grid is still very much in development, but it's in the works. Settle down.
>>
Priscilla Worthinglock - Wed, 04 Mar 2015 01:48:41 EST ID:8VWWDfSO No.6650 Ignore Report Quick Reply
>>6592
Well played


Integrated Engineering by Isabella Fablingfire - Sat, 31 Jan 2015 07:07:59 EST ID:RrEHCrtw No.6629 Ignore Report Reply Quick Reply
File: 1422706079296.jpg -(31555B / 30.82KB, 720x240) Thumbnail displayed, click image for full size. 31555
What's integrated engineering?
Is it worth studying?
>>
Oliver Fuddlestud - Mon, 02 Feb 2015 20:46:20 EST ID:yDcGAtva No.6631 Ignore Report Quick Reply
If you can't be bothered to google that, nothing is worth studying for you.
>>
Molly Nevingwag - Tue, 03 Feb 2015 15:20:32 EST ID:RrEHCrtw No.6633 Ignore Report Quick Reply
>>6631
Google doesn't say much.
Thought that maybe someone here has more experience with this.
>>
Ernest Hillychog - Sun, 22 Feb 2015 14:24:50 EST ID:pJzFTu+g No.6645 Ignore Report Quick Reply
A meaningless phrase that means exactly the opposite of prospects for employment.
>>
David Mannerfuck - Sun, 15 Mar 2015 04:29:39 EST ID:K8DcdBNM No.6657 Ignore Report Quick Reply
>>6629

Jack of all trades master in none engineering.

Major in a real engineering field and double major or minor if you can't decide on one.


Best calculator for university? by Walter Bittingsurk - Mon, 26 Mar 2012 19:44:13 EST ID:8aModPV6 No.3821 Ignore Report Reply Quick Reply
File: 1332805453900.png -(131061B / 127.99KB, 200x401) Thumbnail displayed, click image for full size. 131061
Hey, Im goign into engineering next year and a graphing calculator is required for the course. In school we use TI-83s but I know people who swear by HPs. Which is better? which do you reconmmend? and how much more advanced are the new TIs as opposed to the 83s?
58 posts and 9 images omitted. Click Reply to view.
>>
Nigel Drashcocke - Mon, 13 Oct 2014 12:55:30 EST ID:CU2h2CkN No.6515 Ignore Report Quick Reply
I prefer the Casio 9750GII (NOT THE PLUS EDITION, IT'S SHIT)


>>6506
Godspeed fellow engineer
>>
Hamilton Chidgeville - Mon, 20 Oct 2014 02:47:24 EST ID:nfiHTIHs No.6532 Ignore Report Quick Reply
>>6512
Blockdude
>>
Reuben Bluddlewell - Sat, 15 Nov 2014 09:29:02 EST ID:36+HhpqM No.6571 Ignore Report Quick Reply
>>4033
that doesn't look easy to work with at all
>>
Archie Borrymot - Tue, 13 Jan 2015 05:35:10 EST ID:54PAU9X5 No.6619 Ignore Report Quick Reply
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>>3821

best calculator is my dick
>>
Fucking Shakeman - Sat, 21 Feb 2015 19:02:47 EST ID:oy3G78FX No.6644 Ignore Report Quick Reply
>>4052
you can easily use mathematica or sage online


Mastercam Home Learning Edition by Molly Grandford - Wed, 11 Feb 2015 14:56:16 EST ID:H+wkwIJT No.6638 Ignore Report Reply Quick Reply
File: 1423684576345.jpg -(520093B / 507.90KB, 1829x1808) Thumbnail displayed, click image for full size. 520093
I'm currently in a course covering Mastercam. My book (X7 version) came with an educational version of the program but unfortunately it can only save in a gimped file type (.emcx-7 instead of .mcx-7). I would like to be able to work on things at home to bring into class and post the file there. However, not only am I unsure whether a legit copy of Mastercam can open the student file, but as we are learning on X6 in class it wouldn't be able to regardless.

Would anybody happen to know possible workarounds to this? I opened up a normal .mcx-7 in my student version and tried to trick it with auto-save/backup but that didn't work of course.

I do actually have a cracked version of X6 on my broken laptop; its screen and GPU are busted up but I can connect an external VGA monitor. I figure it would be possible to use that in some sort of conversion pathway. I am too worried to try, though, because I am not sure if there would be some type of 'pirate' residue left inside the file that would be detected on my class computer which is legit with HASP key, etc. Not only do I want to keep myself out of trouble but my school and instructors as well.

I figure I'm pretty stuck as is but thought I would ask anyways.

Also, from my little experience with the program it does seem to have many decent abilities and potential but at the same time there are a whole bunch of seemingly simple things that are buggy as shit. Overall it seems pretty unrefined even if it has whatever capabilities, but that's just my opinion. Anybody else have experience with/opinions on Mastercam?

Maybe resources to help me be awesome at CAM too.


IBEW Aptitude exam by Nigel Blackham - Mon, 02 Feb 2015 02:22:22 EST ID:13NkwJyT No.6630 Ignore Report Reply Quick Reply
File: 1422861742483.jpg -(1240124B / 1.18MB, 1104x1150) Thumbnail displayed, click image for full size. 1240124
I'm not sure If I might be better off posting this on /howto/ but I feel like I might have a better chance of finding an electrician here.

I'm interested in applying for an electrician's apprenticeship through my local IBEW/NJATC training center (VA, U.S.) the only problem is I'm having a little trouble finding out exactly what I'm supposed to know for the entrance exam. All of the sources I've examined seem to agree that reading comprehension based on passages and numerical pattern recognition will be present, but other than that several of the sources I've found disagree. Some of them say that the test involves math up to trig (sin, cos, tan, etc.) but this is in the minority. Most seem to suggest it's just basic algebra, i.e. functions and general math.
I found one alleged study guide that said it would specifically focus on math involving fractions and decimals, and then have a section based on "paper folding" (visualizing folded paper in one's mind and figuring out a pattern).

I'm hoping someone here might have gone through this recently, or at least recently enough that they can give me a first hand account of the subject I should expect. With the exception of the trig I've got a pretty good grasp on the other potential topics, I just want to make sure I'm studying the right materials and that I don't waste time studying things that won't end up being on the test.

Thanks for any help.
>>
Fuck Peffinggold - Mon, 02 Feb 2015 21:34:58 EST ID:a5xmRWEe No.6632 Ignore Report Quick Reply
>>6630
you should call the organization, these places are usually pretty people friendly in my experience.


Volafile by David Findlewill - Sat, 31 Jan 2015 00:43:55 EST ID:YxxDX9gl No.6628 Ignore Report Reply Quick Reply
File: 1422683035730.gif -(45419B / 44.35KB, 468x240) Thumbnail displayed, click image for full size. 45419
I just found out that the 420 room on Volafile is still a thing, and I thought of /tesla/, since you have a hunger for textbooks, it'd be a good way to share/request.
https://volafile.io/r/Dni_HR

Files posted last two days, before auto-erasing.


Helmet Crushing by Frederick Clenkinnat - Mon, 11 Nov 2013 19:14:43 EST ID:oMr173xc No.5993 Ignore Report Reply Quick Reply
File: 1384215283152.jpg -(15357B / 15.00KB, 215x300) Thumbnail displayed, click image for full size. 15357
What's up /Tesla/, I asked this question over in /math/ and they sent me over here.

So I play a role playing game called Warhammer 40k, in this game I play a character who has a Magneto like power in that he can exert force on metal objects.

I'm trying to determine whether or not the force I exert will be enough to crush a human skull with the helmet they are wearing. The power that I'am using allows me to lift 2kg of metal for each point of my willpower(41), I assume this gives me two times the force of gravity, which would give me a total force of about 803N or ~180ft/lbs.

I'm not sure where to go from here, for the shape of the helmet I'm not sure if I can assume its a hollow sphere or if I have to find more exacting measurements to get n accurate answer. As for acceleration I'm just going to say its going as fast as a baseball so ~250m/s/s

What else do I need to know, and what if anything is wrong with my assumptions to determine if I can Magneto crush some poor Imperium soldiers head?
4 posts omitted. Click Reply to view.
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Hedda Crullyridge - Fri, 20 Dec 2013 07:02:46 EST ID:ARMPr7t7 No.6040 Ignore Report Quick Reply
Maybe you'd be best off pulling the pins from all their grenades at once.
That would at least make their day interesting.
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John Blatherford - Fri, 20 Dec 2013 09:17:28 EST ID:ABtclRoI No.6041 Ignore Report Quick Reply
Wouldn't the tensile strength of the material of the helmet come into play? Ceramite is not joke in 40k. Flak on the other hand...
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Jack Seffingsotch - Sat, 28 Dec 2013 18:42:34 EST ID:+8AyT+E2 No.6051 Ignore Report Quick Reply
Too many variables, OP.
>>
Augustus Blackwell - Tue, 20 Jan 2015 02:43:04 EST ID:vaz+up9C No.6623 Ignore Report Quick Reply
>>5993
They were space marines that had genetically modified bodies from the original geneseed making them superhuman and superhumanly tough bones
They could carry a 2 tons on their body Im sure their skull could take it

plus in books they have these rodlike projections/piercings that they put in your head to help withstand that force, or help from psykers or control that psyker shit
>>
Sophie Wocklestock - Fri, 23 Jan 2015 19:56:16 EST ID:DGhbsE6f No.6626 Ignore Report Quick Reply
82kg of pressure isnt much
It wont crush a helmet or a adult head


Cuban DIY by Edwin Duckfuck - Sat, 10 Jan 2015 05:12:22 EST ID:Mhev0LT0 No.6612 Ignore Report Reply Quick Reply
File: 1420884742895.jpg -(44335B / 43.30KB, 500x354) Thumbnail displayed, click image for full size. 44335
http://www.pbs.org/newshour/updates/bizarre-brilliant-useful-inventions-cuban-diy-engineers/

Will you ever be as inventive as a Cuban with a problem and a pile of garbage?
>>
Graham Murdshit - Mon, 19 Jan 2015 21:48:57 EST ID:VrPIhCGo No.6622 Ignore Report Quick Reply
Possibly not but the ideas derived from the culture are good to keep in mind :)


Which degree should i get? by wordmachine - Tue, 06 Jan 2015 02:09:09 EST ID:LNylbZ3V No.6605 Ignore Report Reply Quick Reply
File: 1420528149585.jpg -(19009B / 18.56KB, 680x440) Thumbnail displayed, click image for full size. 19009
Hello fellas, I graduated High School about 8 months ago and I've kind of drifted from low level job to low level job for a bit but now I think I'm ready to go to college. I'm fairly certain I want an engineering or computer science degree of some sort but I'm not sure which to get. Ideally I would want to become a software engineer and work somewhere in Austin possibly at a start up or game studio. Any advice on what path I should be taking?

sorry if this is the wrong board.
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M - Tue, 06 Jan 2015 02:55:55 EST ID:06ISvFUq No.6606 Ignore Report Quick Reply
If you want to become a software engineer this is probaly the wrong thread yes. Maybe you should try /tech/ or /prog/
Good Luck!
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M - Tue, 06 Jan 2015 02:56:41 EST ID:06ISvFUq No.6607 Ignore Report Quick Reply
>>6606
Board, not thread
NB
>>
Frederick Pittingsit - Mon, 12 Jan 2015 20:10:03 EST ID:LHXB/Tyz No.6618 Ignore Report Quick Reply
A lot of universities now offer a major called Exploratory Engineering for those who are not quite sure what discipline they are interested in. You'll mostly be taking pre-reqs early on anyways. Good luck and god speed.


Average & Effective Value by Electro M. Echanics - Mon, 12 Jan 2015 07:39:56 EST ID:Dkbr06ET No.6615 Ignore Report Reply Quick Reply
File: 1421066396469.jpg -(52819B / 51.58KB, 640x369) Thumbnail displayed, click image for full size. 52819
Someone here who could help me out find the average and effective value (True RMS) of this function?
I would be Very Thankful!
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Electro M. Echanics - Mon, 12 Jan 2015 07:42:28 EST ID:Dkbr06ET No.6616 Ignore Report Quick Reply
>>6615
This might help: http://meettechniek.info/compendium/average-effective.html
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Fanny Crimmerwater - Mon, 12 Jan 2015 11:36:28 EST ID:06ISvFUq No.6617 Ignore Report Quick Reply
>>6616
Dit is geen huiswerk website, probeer google of je studieboek. Mocht je geen student zijn, begin dan nooit van je leven aan meettechniek tenzij je geil word van fourrier vergelijkingen enzo


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