/diy/ - Do It Yourself

I want to ruggedize one for RTTY/PSK31/PACTOR/JT65 and other digital modes. I'll also have to make a power supply for it so it can run off of 11 to 15 VDC.

>>100019
How would one go about changing the voltage of 4 of these batteries to 5 volts and be able to recharge them?
http://www.dealextreme.com/p/trustfire-protected-18650-lithium-battery-2500mah-2-pack-blue-5790

>>100023
Two in series to build up 8.4vdc, then using a voltage regulator to bring that down to 5vdc. Just make sure the voltage regulator can handle your current needs.

>>100027
Awesome. Also, can you give me the quick way to convert mAh into Wh?

>>100031
E * I = P

Volts * Amps = Watts

Would love a raspberry pi. 1W webserver, fuck yearh.

>>100038
It's actually 3.5 watts

>>100000

what's so special about this vs an arduino?

>>100797
It is about as powerful as a smart phone, and it comes with HDMI and network jacks on the board.

>>100806
If you mean something like an iphone 3G, yes, but most phones are much more powerful, but cost is the largest factor.
Anyways, unless you get a beta board it doens't seem to be availble until omsetime next year, IIRC.
What are you planning to do with it?

>>100797
More peripherals, more memory, must faster clock rate, 32 bit instead of 8, GPU, runs a full operating system.

>>100832
so it's basically the natural evolution of small scale open hardware platforms like arduino

what's the pricepoint?

>>100842
$25.

>>100842
>evolution
Sort of, yeah. Similar boards have been around for years now, like http://en.wikipedia.org/wiki/BeagleBoard
But the raspberry is much more affordable by the looks of things.

>>100860
And following up, I didn't realize how damn expensive the beagleboard is. 140$CAD on digikey. No wonder there's so much excitement about the raspberry pi...
>dowant.jpg

>>100797
this is totally different to the arduino

the arduino is a microcontroller board, it's used mainly to control external hardware (LEDs, relays, motors, sensors, etc)

the raspberry pi is a small computer to be used like a PC, it's not as powerful as a desktop PC, but it's cheap and has enough power to play HD video.

With this add-on board, the Raspberry Pi will be able to control peripherals and LEDs and sensors just like the Arduino. Get excited.

And here's the Pi playing Quake 3. Some glitches here affecting the frame rate, but they got it going at 60 fps before: http://www.youtube.com/watch?v=e_mDuJuvZjI

OH GOD I CAN'T WAIT TO PLAY QUAKE 3 ON A COMPUTER THE SIZE OF A CREDIT CARD


Of course, they said they were going to be available this year,

>>100888
I don't understand the purpose of that board... it has a pic, it can do everything without the raspberry pi...

Ok, how do I get my hands on one of these? Do you use the flash card as the hard drive? Can it be upgraded? I'm not even sure what I want to ask about this thing, because holy shit it's fucking amazing!

Does it come pre-loaded with an operating system? How would you install programs? Via USB? Via flash card? Oh my god I have SO many plans for this thing! I'm practically orgasm-ing all over the place.

<-- Pic related. My fucking face dudes.

>>100909
they are not finished yet, so they aren't on sell now
hopefully we are going to be able to buy them on january

they will run linux from a SD card, fedora will be the default distro

you can install stuff from the internet the same way you do it on a normal PC (I don't know how people will install programs in the model A since it has no ethernet port)

>>100914
If it had a usb port you can use a usb wireless to connect to the internet. If they are using micro usb, then maybe use an adapter?

One concern I just thought of is heat. If you are using this thing, it's gonna get real hot real quick, especially if you're playing games on it that push it's limits. Looking into a powerful miniature fan and heat sink would be a great idea.

I'm glad that it comes with linux, because it will be much easier to trade up for something better suited/more familiar.

>>100921
no, it doesn't get hot, it doesn't need a heatsink or a fan

it consumes a 2 or 3 watts at max load

>>100894
Could be that the pic provides just some glue logic, and maybe doesn't control the whole board. Need a schematic to be certain one way or another.

>>100924

Well, that is certainly very interesting! A tiny, (relatively)powerful computer that draws only two to three watts...

To think, this is basically the beginning of a whole new generation of micro-sized computers that will only continue to become smaller and more powerful. Very, very exciting.

>>100927
yeah, I think it's supposed to do that, but you could also use the pic itself to do whatever you want...

The only use I see to it is using the stuff on the board to interact with a program running on the raspberry and on screen, like connecting potentiometers and use them as controls to play pong or stuff like that

>>100931
it isn't anything new, it has the same hardware used in smartphones and stream boxes like the hulu box, only that in a form that lets you do anything you want with it

>>100934
>it isn't anything new, it has the same hardware used in smartphones and stream boxes like the hulu box, only that in a form that lets you do anything you want with it

> in a form that lets you do anything you want with it

That's why I'm so excited! The potential to turn something like that into an amazing new tool is incredible. Imagine, real Pip-Boys. Glitch, from Reboot....

this is what I'm gonna do with it

one very interesting potential application
since it's a full fledged linux box and thus can do all the things linux can...
a middle-of-nowhere pc?
with only 3 watts of draw, running this off a modest solar panel and some batteries is not outside of the realm of possibility. a small, efficient screen, headphones and a keyboard...and you could basically have a work system installed in a treehouse powered by a one foot square solar panel on the roof.

>>100960
oh, and from this i was just reminded of Cave Troll from /r9k/, who lives in a cave in some park somewhere and used to post on /r9k/ before it exploded.

last i heard he was sort of hurting for a small low power computer (his netbook wasn't doing well) that could run off a small solar panel so as not to draw attention to himself

>>100960
it's like a cellphone, you can run it on batteries, so you won't have problems with that, except for the power for the tv

>>100946
Though it can physically do all of that, you'll be disappointed with the quality of the sound and gaming abilities.

Unless you like low quality sound and jittery games, of course.

>almost January
>it still isn't out

Fuck this gay Earth

It is way too advanced and complex to be of any hobby electronics value and too underpowered to serve any real purpose today.

get a job and buy an atom cpu barebone if you need a small pc

foo

>>101043

>implying RasPi isn't more powerful than 90% of the embedded systems out there
>implying that no one uses media servers
>implying no one uses netbooks
>implying no one uses routers
>implying that the RasPi couldn't do all of these applications beautifully

>>100023
http://www.dealextreme.com/p/vmp3203-5v-high-efficiency-dc-dc-module-47817

>>100946
Hey, I remember these shitty drawings from that turntable thread. Did you ever get that up and running?

>>101120
>implying RasPi isn't more powerful than 90% of the embedded systems out there

In other words,
> way too advanced and complex
for most embedded applications.

>implying that no one uses media servers
>implying no one uses netbooks
>implying no one uses routers

RPi is none of these and adding the required functionality to it seems to be a non-trivial matter.

Well, you're free to build whatever you want. I'm actually interested to see what people can make with it - particularly stuff where RPi is a good choice.

>>101043
>to complex to be of any hobby electronics value

but doesn't it have free IO pins?

>>101137
you either need to write an app for the linux OS, a kernel driver for the kernel or develop your own _complete_ OS to serve the rasperry hardware to even get to the I/O pins

with your common micro controller you can access them with a few lines of Assembler/C/whatever _without_ any need for any more code

just saying again its way to complex to do some simple prototyping

>>101136
this isn't intended for hardware development
it was made as a cheap platform so kids can learn to program

It's a computer and you can do whatever you want on it. It's powerful enough to do lots of stuff. All the stuff I do today on my computer I did before on a pentium II, and the raspberry pi is more powerful than a pentium II

it will emulate NES, SNES, and GBA games for sure, maybe it will also be able to emulate PSX and N64 games

It will also run XBMC so you will be able to watch HD movies, and if it plays HD video it will also play SD video and music

>>101175
>develop your own _complete_ OS
Really? I mean I realize that without writing your own OS none of the peripherals will work but surely anyone with the correct ARM programmer can run arbitrary code.

Does it not have on-chip flash or ram?

>>101175
someone will make a program or library to let you control the I/O pins easily

there's a community forming already, you won't need to do anything by scratch

>>101043
>too advanced
>too complex
>underpowered

go back to sucking your supervisors cock, intel shill faggot.

>>100013

>ok so assuming this can be used as a substitute for a netbook, whats the cheapest way to make peripherals?

going on bare minimums I think you would need a rechargeable battery, a monitor of some kind, a keyboard, wireless capabilities, and maybe a mouse. I figure with the exception of the keyboard everything could be rigged to fit inside a cigar box.

What would be good sources for salvaging these materials or places to outright buy cheapest alternatives? Hypothetically would this be the equivalent of a low-end ($200) net-book or a high end ($500) one?

>>101274
making a netbook will be hard since it only outputs HDMI and composite video laptop screens won't work with it.

the rest of the stuff you can fit inside a thick keyboard with enough space inside

you could easily make a portable computer with battery power that you can just plug on any TV you find and use right away, but a netbook will be harder