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Anonymous 2015-10-05 19:22:45 No.1233 [Reply]

for an uni project i have to do something with a raspberry pi.
the task is to create a custom linux system with LFS and then to do something. the linux has to be tailored for the use case.
our professor gave us some examples such as a nas, webserver, streaming server, etc. all of this sounds kinda boring so I need good ideas.

my first thought was some kind of lisp machine but i don't know if this is enough work for the project. to be honest i am fairly new to lisp and would use this project to learn more about it on the side.
any thoughts on this idea or other ideas?

2 posts and 1 image reply omitted. Click reply to view.

Anonymous 2015-10-06 06:57:12 No.1236

>>1234
I like your idea. Don't know how it is elsewhere in the world but here in germany the assholes of people in charge get as tight as a 7 year olds when it comes to spending money. no way anyone would take the risk of losing 100€ worth of hardware for a student project. i won't even think about the legal issues of starting a balloon (air traffic is quite near)

Anonymous 2015-10-06 12:13:28 No.1238

>>1236
It can be retrieved if fitted with parachute:
https://criticalengineering.org/projects/deep-sweep/

Anyway, you can make weather station on the ground. Measure pressure, wind speed, temperature. Or solar flares via amp and VLF antenna (people even record Schumann resonance). Store or feed data on LAN/Internet.

Something like networking service is indeed boring. Maybe home electronic center a.k.a. smart house, for turning lights, appliance, etc.

Anonymous 2015-10-06 13:37:34 No.1239

>>1236
Do you need to demonstrate its use? If not you can just build the OS as if you have all the hardware, when in reality you don't.

Anonymous 2015-10-06 13:40:10 No.1240

>>1239
no i could feed it with dummy data.
i would prefer something usefull because then i only have to buy a pi2 after the semester and can use my system.

>>1238
weather station is a nice idea. i will look how much the hardware would cost tonight.

Anonymous 2015-10-08 22:47:18 No.1247

Make it into a floating radio station.
The Raspberry pi can transmit FM a surprisingly far distance. Look up PiFm by the Imperial College robotics club for the source code. Then just put it on a balloon and let it fly around, broadcasting glorious pirate radio until it crashes into something.

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Plastic Bottles Anonymous 2015-08-13 20:59:48 No.992 [Reply]

I'm fishing for ideas. I'm accumulating notable amounts of plastic bottles. They're sturdy and in good condition. My state doesn't have a recycling program for me to directly sell them, but it seems like a terrible waste of good resources to toss them out. Apart from basic arts and crafts stuff, does anyone have any suggestions for what I could do as a project? I've got trash bags full of these.

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Anonymous 2015-09-15 04:46:20 No.1113

>>992
Make a warehouse to store all your plastic bottles in.
http://www.smithsonianmag.com/arts-culture/how-to-turn-8000-plastic-bottles-into-a-building-159096582/?no-ist

Anonymous 2015-10-07 05:25:21 No.1242

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OP here. Still checking back.

>>1113
>Make a warehouse to store all your plastic bottles in.
If I keep this up, I'll need one.

>>1112
>pontoon bridge
Huh, I hadn't thought about making a bridge... Not sure where I'd make a bridge to though.

How well or how long does chicken wire hold up in water? Would it oxidize and corrode? Or can you think of a better material for holding a configuration in place over time while submerged?

>Cut off the bottleneck and grow plants in such pots.
I'll do this with some of them... What to grow though? What's something useful that grows well indoors, preferably without a heat lamp? I'm hot enough in here with all this hardware going, but I've only ever done outdoor gardening before, like pumpkins and stuff.

Post too long. Click here to view the full text.

Anonymous 2015-10-07 12:45:57 No.1243

You could make a bioreactor. Run a search some one made one for algae.

Anonymous 2015-10-07 13:22:34 No.1244

>>1242
>How well or how long does chicken wire hold up in water? Would it oxidize and corrode? Or can you think of a better material for holding a configuration in place over time while submerged?
Zinc-coated wire will last long. Its just too weak for holding structure. If you go with crates, you can use nylon rope or ribbon for holding crates together. Just make sure to fix it securely by screwing it under wide plank (and through). Chicken wire can be used to fix bottle from open side of a crate.

>What to grow though? What's something useful that grows well indoors, preferably without a heat lamp?
Dill, parsley, green and black basil, aragula, jalapeno peppers, leek, small carrots. All of them grow on windowstill/balcony, just water them regularly.

Anonymous 2015-10-08 22:44:32 No.1246

>>1244
This is a good idea. Depending on where you live, smaller, organic focused grocery stores will buy these from you. A nice way to make a little extra cash.

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Woodworking Thread 2015-09-26 11:23:25 No.1176 [Reply]

I have been caught on YT by this channel: https://www.youtube.com/channel/UC3_VCOJMaivgcGqPCTePLBA

I really admire people who build stuff by themselves and stuff, but this guy just has too much tools for any of it being reproducible.

But people have been woodworking since the beggining of times with way simpler tools, so is anyone here into this?

Let's share tips, the minimum amount of tools you need to be able to do nice stuff with wood, and ideas of projects!

12 posts and 2 image replies omitted. Click reply to view.

Anonymous 2015-09-29 00:02:55 No.1200

>>1199
nitrocelulose is hard as fuaarrrk but nevermind that, i forgot that it's not that easy to get it i get it from my job. Polyurethane lacquer is acrylic lacquer, like nail polish but the one one you get for wood will be hard too. Not as hard as epoxy though.

Anonymous 2015-09-29 00:09:46 No.1201

I recently saw something about woodworking as well.
There was this guy who ditched most of his tools for a few chisels.
It had something to do with programming, but I can't remember what.

Anonymous 2015-09-29 11:48:48 No.1204

>>1197
If he wants to to use OSB as butcher block, then yes, he will essentially be eating from it. Another one asked about desk and I wasn't replying to him.

Anonymous 2015-10-01 18:02:45 No.1218

I'm interested in early cave-men work and how tribes were formed in the early days. This channel shows how they (probably) did it
https://www.youtube.com/watch?v=P73REgj-3UE

Anonymous 2015-10-08 02:42:01 No.1245

>>1218
This is super cool to me. How it all started from nothing to where we all are today.
Damn.

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Electronics General Anonymous 2015-06-13 23:31:50 No.742 [Reply]

>Cyberpunk based website
>No electronics thread

Shame on you, opening an Electronics General, feel free to share your projects, what you've been working on, etc.
Let's get this board going.

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Anonymous 2015-10-01 05:12:26 No.1214

>>1212
Correction, D5 is a diode. It still looks fine.

It looks to me also as though that cap is not blown; it appears to be covered in glue. That appears to be a thin film capacitor, also called dielectric film or polymer film. They don't usually go as dramatically as electrolytic capacitors.

>>1210
It may not be easy to fix, but also it may be. Do you have any tools at all? (multimeter? anything?)

Anonymous 2015-10-01 13:14:09 No.1217

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>>1214
Yes I do have a multimeter (Mastech 1015B, analog), which I played with for the first time. Quite fun.

R5 and R7 (left from the heatsink) show me 3 and 10 Ohm.
R1 makes the needle move very slightly between 10k and 1k, it basically stays on the left while it should go from the right, correct?. Had to change the setting from X10 to X1k to get it to move even that far.

The Diode doesn't seem to give me anything. Only if I lower the resistance it bumps very slightly for a second, but I guess that might be caused by some leftover currents or so. The meter reacted though when I accidently touched the resistor, but only when I connected the right leg of the Diode and the left leg of the resistor. I tried with both ends of the multimeter, same reaction.

Couldn't get much from the capacitors since their legs aren't easily accessible with the exception of the right one (C1, which is also covered in that stuff).

I tested all parts without detaching them.

I also have a soldering iron and the basic screwdriver, plier set.

Anonymous 2015-10-02 00:38:46 No.1221

>>1217
Measuring individual components while they're in the circuit isn't going to tell you what you want. You'd have to draw out the circuit diagram and calculate what the resistances ought to be. Also it's pretty rare for resistors to fail without visible burn marks. More likely it's the semiconductor (triac?) under the heatsink or bad contacts in one of the relays. You did change the fuse right?

Anonymous 2015-10-02 11:44:23 No.1223

>>865
Seems cool but I wouldn't fuarrrk with it out of fear of accidentally hurting someone with electronic medical devices.

Does anyone know the legality of electronic weapons?

Anonymous 2015-10-04 06:07:05 No.1229

>>1217
The diode should conduct in only one direction. Check conductivity in both (by switching which side you have the power and ground on).

I notice in the rightmost picture that some of the glue looks pretty discolored, possibly due to heat. Under the heat sink you have a high power part, probably a FET which turns on the motor. If it burned out, that could be the cause of the heat.

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Build your own mini pc buildkit. Anonymous 2015-03-24 22:24:54 No.551 [Reply]

You have what this would cost you + shipping fees and a soykafload of time but instead of starting from a precompiled buildkit for kids you make your own soykafty "mini pc".

How do you do it? Is it general purpose or not?

6 posts and 1 image reply omitted. Click reply to view.

Anonymous 2015-08-16 23:03:34 No.1009

>>725
No. Unless that wasn't me? But I'll maybe be getting one in a few years for a nephew, when he's old enough. Maybe I should try giving some to some other children who are already older, but they mostly end up getting used electronics from their parents.

Anyway, I was thinking I would rather get something like the Wiki Reader, since it's lower power and being constrained to text-only would actually be a nice feature for an educational toy, since that means it demands that the user practices their reading and writing to do anything with it.

But the foundation that made Wikireaders went under. I guess electronics made specifically for rural areas of developing countries aren't that marketable?

In any case, the code was still on github last time I checked but I don't know of any way to cheaply get a hold of arbitrarily sized e-ink displays. As a substitute, I think Sharp Electronic LCDs might work, though buying them direct looks to be about as expensive as e-ink. Maybe some retailer can stock it. I guess I could just go with a regular LCD display and accept the greater battery drain.

Anonymous 2015-08-16 23:44:44 No.1011

>>551
I want my children's first computers to be something like that.

Anonymous 2015-09-19 10:28:09 No.1116

>>571

> How much

$2460

Doesn't make much sense to me. The board is $550. that means $1910 for the case, screen, ssd, memory, speakers and battery.

Anonymous 2015-09-30 09:34:22 No.1209

>>551
there's a lot of hype surrounding the pi and all the things you could do with it, but as an actual way-to-day computer, even a mini one, it's still very limited. I'm not saying that's a bad thing, the whole reason it's useful at all is because of it's cheap price and small size.

what I think would be better for a day-to-day mini PC would be the motherboard from a laptop, purchased by it'self from ebay for around $100. if you can make a case for it then you have a very capable platform that can easily be used with any OS (even bloated ones like windows >8. the only advantage the pi has (apart from still being cheaper) is that it comes with ram and has cases readily available.

Anonymous 2015-10-01 05:19:14 No.1215

>>1209
Yeah, the Pi is one of many embedded boards, the only places they really excelled were price and marketing.

If you can find some of the newer pi clones/competitors based on the allwinner H3 or A33 (if I correctly recall the part numbers) you've got a pretty solid little machine- quad core in the 1.6GHz range. This is more than enough for a basic computer with a good linux distro.

These boards are also something of a win for open source, especially compared to something from intel.

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Lainchan Projects Anonymous 2015-02-11 18:39:24 No.398 [Reply]

Hello lains. I really liked the idea of the Weekly Project and started to think about the possibilities.

The people on the IRC agree that we probably have lots of capable people here (specially with technology) and that it would be nice to have a small poll (or something like that) so we can gather some information about peoples capabilities and desires in order to be able to better organize common projects. So, some questions:

1) Do you think this is interesting?
2) Do you know a practical way of gathering this information?

It could maybe result in some nice art projects, information websites, a lain-community github account, a lain wiki, etc…!

38 posts omitted. Click reply to view.

Anonymous 2015-07-29 10:27:54 No.926

>>907
I propose that we split this thread in two. One thread can be more /art/ and /lit/ centred and the other can be more /cyb/ and /tech/ centred

Anonymous 2015-07-29 11:57:41 No.927

>>926
Amen.

If you want to hear more about the /art/ and /lit/ part, come to #1998AD on Freenode.

I shall eagerly watch the lainons put together an idea for the /cyb/ and /tech/ centered project..

Anonymous 2015-07-29 21:50:00 No.929

Though this may be more suitable for a kickstarter, or something made by one person, I have a good idea for a physical device.

The iPod, or the iPod Classic as it was when it died, was basically a hard drive with a screen. Now that the product line is no more, I was thinking of making some rudimentary equivalent.

That led me to the problem: should I use a HDD and save on money/increase space, or use a SSD for speed? That led me to the conclusion, why not just make the enclosure, allow it to adapt to any 2.5" SATA device? That way the user can quickly swap or replace drives, or use their own old one.

So all we'd need for components would be the case to put around it, a screen, some buttons for an interface, a battery, and a board that has ram, an OS, a plug for power and audio out.

Battery would probably be the hardest thing, now that I think about it. Plus, trying to fit all that into one small enclosure might make it too big to fit in a pocket, or carry around easily.

Maybe have it connect to the drive externally, and mount it to the device itself?

Anyways, this would be a great thing to have, I'm fine with my Sansa Clip+, but I won't be able to get more than 32GB, and even if I could get more than that I'd be spending almost the same amount as a 500GB HDD

Just an idea, may not be able to execute via internet, but still possible

Anonymous 2015-07-30 05:04:19 No.930

>>929
A device that could take multiple MicroSD cards or mSATA SSDs would be a lot more userful, smaller, and more power efficient. SSDs and SD cards are getting cheaper and cheaper so the price won't be a problem. This also gives more room for a battery. Even at that point though, if you need more than 128GB of space on a mobile device there's already something wrong there since I doubt you use all that content regularly enough to justify the extra cost of having to make something like this.

Anonymous 2015-09-30 02:17:44 No.1208

>>919
Why not contact teknik to see if they want to help out?

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Anonymous 2014-10-15 21:34:35 No.71 [Reply]

Any recommendations for learning electronics? I'm just starting on my journey and ordered Grob: Basic Electronics and Electronic Principles by Malvino. Any other tips or suggestions? allaboutcircuits.com seems cool as well.

2 posts omitted. Click reply to view.

Anonymous 2014-10-17 21:56:52 No.78

For what this is worth as I am only starting too learn about Electronics and Electricity as well.

1. Surprisingly enough you can learn a great deal about physics on Youtube.
Just search for the topic that you are interested in learning about into Youtube

2. Look for books in your local library, If you prefer hard copies to electronic versions

Anonymous 2014-10-18 10:35:37 No.79

Maybe this would be helpful:
https://6002x.mitx.mit.edu/

Anonymous 2015-01-18 16:49:28 No.287

I bump this thread, more as a way to save it from the abyss, but I'm sure you have some nifty references to share for this subject : What book a total novice about electronics should read in order to build a «progressive» LED lamp and later something like this instructables [1] ?

Some days ago I posted a Gimped version the Virgin Mary with the face of the Lain on /q/. I ordered a small poster of it, and I want to make some kind of colored lamp/frame for my bedroom to display it and light the room, and later to use it as a dawn simulator.

[1] http://www.instructables.com/id/A-sunrise-and-sunset-lamp-with-LEDs/step7/Modifications/

Anonymous 2015-01-22 10:10:10 No.298

>>71
>ordered
That's a strange word for downloaded.

Anonymous 2015-09-27 06:43:50 No.1183

So, will this help me with dumpster diving?

Why dumpster diving? Well, I am getting parts and soykaf from dumpsters, right? But, I have NO idea if any of it works, and I am not sure how to test it safely so I don't die.

Suggestions? Which resource should I use first?

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Hobby/Student Electrical Engineer!IGEMrmvKLI 2014-10-12 19:18:10 No.40 [Reply]

homemade graphene supercapacitor thread?
home made graphene supercapacitor thread

http://www.graphene-battery.net/graphene.htm
https://www.youtube.com/watch?v=Eo_1Y_yJZ-o
https://www.youtube.com/watch?v=K7E5NSFJIYU
https://www.youtube.com/watch?v=uujf5tpkm8M
https://www.youtube.com/watch?v=_oEFwyoWKXo
https://www.youtube.com/watch?v=G-AF7_Blj_k&index=1&list=UUTI8sPeiUELwBOKIT2ikArw

A lot of different perspectives

5 posts omitted. Click reply to view.

Anonymous 2015-01-12 22:07:14 No.254

>>89
>People just know what they hear on TV and from other people, most of the times….

The lazy, these things can be a scurge on knowledge!

Anonymous 2015-09-24 10:44:57 No.1152

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Since this thread seems suitable enough:
Pic of my first trial to roll a capacitor.

Basically just a quick test of using aluminium foil any mylar.

I'll bond the taps of this unit with graphene spray, if this thing can store the power I need I'll try spot welding those next time.

Anonymous 2015-09-24 11:30:56 No.1153

>>1152
let us know how it goes laion

Anonymous 2015-09-24 14:56:30 No.1155

>>1153

Foil ripped halfway through, what a pain.
Will try again tomorrow using a better setup.

Anonymous 2015-09-26 00:47:13 No.1173

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>>1153
Didn't work out at all.

Good thing: Not shorting out.
Bad thing: Doesn't hold charge. At all.

Winding a foil cap is hell incarnate, that much I can tell.

I rolled the opposing sheets which should form the capacitance in unison so that they stick together as close as possible.
I also dropped the idea of tapping using graphite spray, this lead me to embedding stripped wires this time.
Reason being that the graphite from earlier resulted in a contact resistance of 41-45Ω.
Way too high since the ESR would equal to at least 90Ω.

I might consider giving a wet construction a try some day.
Not only does that simplify construction in my opinion, but it also brings way more capacitance.

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Anonymous 2015-08-12 22:25:04 No.977 [Reply]

Office lainons, this ones for you.

stop eating at lardbutters every afternoon. quit feeding your paycheck to vending machines. Oscar Meyer is not your friend. You need to be making home made ramen and it needs to start with mason jars. wide mouth, 16 ounce mason jars packed with anything you want. noodles, soykafake, miso, peanut butter, and a bit of hot sauce with some spinach do well. now go to the break room and fill it up with hot water. Pack an apple or a bag of granola and thats lunch.

the best part? you can make it ahead of time and a 12 pack of mason jars is dirt cheap. Need breakfast? pre-cook 9 grain cereal or some oats and pack one of these full with a bit of peanut butter or coconut flakes. once at work, hot water should do the trick.

put 10 of these together, 5 breakfast and 5 lunch.

If anyones interested I have recipes for soymilk, peanut butter, kimchi, and tofu (from scratch.)

16 posts and 7 image replies omitted. Click reply to view.

d8a 2015-09-14 07:13:28 No.1108

For nutrition, I've picked up making Gaspacho. It's a cold tomato soup. Blend 2 cans diced tomatoes, half a medium red onion, 1 bell pepper, 1 seeded and skin cucumber with 2 tablespoons olive oil, 2 tablespoons red wine vinegar, 1 teaspoon salt. And the secret ingredient: 2 slices of wheat bread. Serve cold. makes 4 servings, keeps in a thermos, requires only a blender. fuarrrking delicous. Good with some artisan bread on the side. About a dollar a serving.

(Copy paste of my recipe from a cooking thread in /cyb/)

Anonymous 2015-09-21 21:26:19 No.1130

>>977
Actually made the sesame miso noodles from the original post of this pic. Replaced the shiitakes with dried black fungus. Added some chili-garlic sauce. Really good! Planning on making a few jars of this to keep in the fridge.

Anonymous 2015-09-25 11:25:26 No.1171

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>>1130
>wanting to eat frozen soggy noodles
Get some proper instant noodles,not the top-ramen soykaf that they sell at stores.
>pic related

Also, learning how to properly cook instant-noodles can drastically improve the taste.

Anonymous 2015-09-25 21:01:18 No.1172

>>1171
I got some precooked ones from the local Asian market. They're not wet or frozen, they're the dryness of noodles from like a Mongolian restaurant where you make your own stir fry, not crunchy.

This is the website from OP's pic
http://www.seriouseats.com/2014/09/diy-instant-noodle-cups-food-lab.html

Just precooked noodles, veggies, flavor base and spices, add hot water when you want to eat and wait a couple minutes.

I try to stay away from the high sodium prepackaged stuff, I've found a few spicy vegan Vietnamese ones that are decent tasting and are relatively healthy.

Anonymous 2015-11-27 06:23:47 No.1438

>mason jars

thanks but i'm not a white girl

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DIY Music Anonymous 2015-03-13 18:47:03 No.535 [Reply]

anyone building their own instrument or other music-related hacks?

18 posts and 6 image replies omitted. Click reply to view.

Anonymous 2015-04-10 11:43:57 No.598

>>595
Neat. The capacitor makes the wave uniform?

Anonymous 2015-04-10 18:34:24 No.599

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>>598
There are three things at play:

1. This is a logic chip, so pin 2 is either 'on' or 'off', with on always being the same voltage. So we either get high voltage or nothing sent to the audio output. This gives the output a square waveform.

2. The "Schmitt Trigger": The threshold to trigger the gate to flip to 'on' (a low voltage at pin 1) and the threshold to flip back to off (a high voltage at pin 2) are different on this chip. So when pin 2 is 'off' the voltage supplied to pin 1 has to decay quite a bit before pin 2 will switch 'on' again. Once it's on the voltage has to ramp up quite a bit to switch pin 2 'off'. So the output has two relatively stable states and oscillates between the two.

3. The capacitor takes a little time to fill up with charge received via the resistor from pin 2 before it discharges. If you liked you could work out the exact time with some equation using the resistor and capacitor values. Since I'm using a potentiometer (variable resistor with a knob) I can change the frequency of the oscillations.

>>594
555 is also a good chip for an oscillator. You set up a couple of capacitors and resistors to control the timing in a similar way and you get a high-low oscillation output at pin 3.

>>590
I really want to build a few of the things from that site. My dream is to build a 'noise box' of my own design with a few oscillators and a some tone and distortion controls. Gotta get my 'minimum viable product' complete first though.

Anonymous 2015-04-21 23:27:45 No.624

The Hackaday "Logic Noise" articles about abusing TTL logic chips for synth use are also good.
They have moved on from the basic 4069 osc and are now making amplifiers and filters from it!

Anonymous 2015-04-25 03:35:51 No.629

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If you guy are looking for a cool easy project, you could always build a 3 radio theremin.

https://www.youtube.com/watch?v=PSYPUhPGavQ

But I must warn you that this machine is a untameable noisy ambient texture generator. Made one for a girl once… She liked it.

Anonymous 2015-09-25 01:31:18 No.1161

>>544
I had an idea for a similar synth.
basically you distribute diracs and such in the frequency spectrum, and with some functions or such you control their behavior/parameters.
A reverse transform would generate a signal.
For example you could create a sine, and manipulate its frequency and amplitude in the form of some function.
Or distribute diracs in such a fashion that they create a square-wave, and manipulate some of its harmonics.
I imagine you could do some cool soykaf with that, and if its well done have some nice visualization of what is going on.

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