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by RITRedbeard
Sat Dec 03, 2011 9:16 pm
Forum: Off topic discussion
Topic: How many here actually *care* about the goals of the project?
Replies: 147
Views: 20323

Re: How many here actually *care* about the goals of the project?

<r>I care about the goals of the project as I can empathize. I've had interest in computers since an early age but there reached a point where my technological inquiries were beyond what those around me knew. Curiosity "in the dark" can put one off from exploration (I remember buying really poor pro...
by RITRedbeard
Wed Nov 30, 2011 3:32 am
Forum: General discussion
Topic: Coburns take on powering the Raspberry Pi via batteries
Replies: 69
Views: 10745

Re: Coburns take on powering the Raspberry Pi via batteries

<r>Yeah, you would probably have to get a lithium polymer battery in slightly higher voltage than you are expecting. Typically lithium polymer batteries come in 3.7v, 7.4v, 11.1v, 14.8v... the only reason to go NiMH is initial cost and safety. I believe you can get a 10.7vdc configuration in NiMH.<b...
by RITRedbeard
Wed Nov 30, 2011 3:14 am
Forum: Other projects
Topic: DOOM3 source code released
Replies: 28
Views: 5837

Re: DOOM3 source code released

<r>Quote from Svartalf on November 23, 2011, 22:42<br/> Okay... That was quick (and impressive...). But still not analogous.<br/> <br/> Where do you think his GPU got it's memory and where does the R-Pi get it from? I guess it's going to boil down to whether it will skinny down to about 192Mb of sys...
by RITRedbeard
Tue Oct 18, 2011 7:22 am
Forum: Other projects
Topic: Mouse and keyboard over GPIO?
Replies: 4
Views: 1698

Re: Mouse and keyboard over GPIO?

In an interest of saving the USB ports, is there a method for Linux to hook up mouse and keyboard over GPIO/as serial devices?
by RITRedbeard
Sat Oct 01, 2011 7:08 am
Forum: Other projects
Topic: Build a laptop reusing a dead one.
Replies: 30
Views: 9442

Re: Build a laptop reusing a dead one.

<r>Quote from abishur on September 13, 2011, 15:22<br/> @ RITRedbeard were you able to play with this any?<br/> <br/> Unfortunately my classwork is keeping me busy. If these chips weren't in such ridiculous packages and I could work Eagle, I might be able to get PCB ordered from BatchPCB.<br/> <br/>...
by RITRedbeard
Wed Sep 21, 2011 9:38 am
Forum: Other projects
Topic: Build a laptop reusing a dead one.
Replies: 30
Views: 9442

Re: Build a laptop reusing a dead one.

<t>Update: Classes are kicking my butt. Been a bit under the weather lately.<br/> <br/> Still have the chips. I think I am going to design the circuit up in Eagle, have my EE buddies look it over, order the one or two last remaining parts I need and then have Sparkfun design the PCB for me.<br/> <br...
by RITRedbeard
Tue Sep 20, 2011 6:53 am
Forum: Other projects
Topic: Power Supply / Charging Circuit
Replies: 8
Views: 1959

Re: Power Supply / Charging Circuit

Charging as in plugged in and charging like a laptop? I was thinking the same thing since my goal is to turn a Raspberry Pi into a much more efficient netbook for my needs.

Any idea on circuit diagram and parts?
by RITRedbeard
Sat Sep 17, 2011 7:47 am
Forum: General discussion
Topic: LVDS Interface
Replies: 68
Views: 24893

Re: LVDS Interface

Bingo. I have the sample chips here but I lack time and smd experience. Going to have to buy a few more parts and etch my own board, I think. Let you know how it is going.
by RITRedbeard
Sat Aug 27, 2011 3:44 am
Forum: Off topic discussion
Topic: Hack a day
Replies: 11
Views: 2185

Re: Hack a day

Again! Pfft, doubters. :)
by RITRedbeard
Sat Aug 27, 2011 2:14 am
Forum: General discussion
Topic: Stepmania for linux
Replies: 27
Views: 5599

Re: Stepmania for linux

<r>Quote from jamesh on August 24, 2011, 21:22<br/> Quote from RITRedbeard on August 24, 2011, 18:54<br/> Stepmania is programmed in SDL, so, yes, probably!<br/> <br/> <br/> <br/> Er, think it's C++. That said, a recompile should get it working.<br/> <br/> <URL url="http://www.stepmania.com/wiki/......
by RITRedbeard
Thu Aug 25, 2011 4:58 am
Forum: Other projects
Topic: Build a laptop reusing a dead one.
Replies: 30
Views: 9442

Re: Build a laptop reusing a dead one.

<r>So the plan is to feed the TDMS data from HDMI to TI's TFP401, then feed that data into TI's SN75LVDS83B. Theoretically, it should work. I recommend anyone with EE experience or SMD work to sample the chips and see if you can get it to work. I expect my first attempt to fail. Luckily, we have unt...
by RITRedbeard
Wed Aug 24, 2011 6:04 pm
Forum: Other projects
Topic: Build a laptop reusing a dead one.
Replies: 30
Views: 9442

Re: Build a laptop reusing a dead one.

<t>Update: Samples are sent to my uni address, they should arrive sometime today, I'll be arriving there on the Aug 29th-30th.<br/> <br/> The hard part will be creating the circuit and soldering (these are in pretty small packages) and I've never done SMD work before, so it will take some time (lear...
by RITRedbeard
Wed Aug 24, 2011 5:54 pm
Forum: General discussion
Topic: Stepmania for linux
Replies: 27
Views: 5599

Re: Stepmania for linux

Stepmania is programmed in SDL, so, yes, probably!
by RITRedbeard
Mon Aug 22, 2011 9:28 pm
Forum: Other projects
Topic: Build a laptop reusing a dead one.
Replies: 30
Views: 9442

Re: Build a laptop reusing a dead one.

I'm working on a circuit (or exploring ICs) that together will probably cost the same amount or less as Raspberry Pi (less if you can sample) that will work to interface the TMDS protocol HDMI uses and ships it to LVDS.

Don't throw away your dead laptops yet, folks.
by RITRedbeard
Mon Aug 22, 2011 4:31 pm
Forum: General discussion
Topic: LVDS Interface
Replies: 68
Views: 24893

Re: LVDS Interface

<r>That can't be right. Maybe Gert or Eben can pop in with the HDMI output specs this way have a better idea of what chips for a circuit to convert the signal. TI seems to have some good chips for a solution, the only thing is now prototyping it with cost effective parts that can be bought in small ...
by RITRedbeard
Sun Aug 21, 2011 8:26 pm
Forum: General discussion
Topic: LVDS Interface
Replies: 68
Views: 24893

Re: LVDS Interface

<r>Well, since HDMI implements TMDS, wouldn't it just be a matter of converting the HDMI signals to 3.3v friendly ones then using a LVDS transmitter IC?<br/> I'm just looking at DS90C363AMTD by National Semiconductor (quite an old chip, but using quite an old panel) and information gleaned here: <UR...
by RITRedbeard
Sun Aug 21, 2011 7:48 pm
Forum: General discussion
Topic: LVDS Interface
Replies: 68
Views: 24893

Re: LVDS Interface

by RITRedbeard
Fri Aug 19, 2011 4:02 am
Forum: General discussion
Topic: Alpha Board dimensions?
Replies: 7
Views: 2055

Re: Alpha Board dimensions?

Just curious, what are the x, y, z of the alpha boards (I do realize the boards to ship will be smaller)?

Especially height. What is the height/highest point?
by RITRedbeard
Wed Aug 17, 2011 4:46 am
Forum: General discussion
Topic: LVDS Interface
Replies: 68
Views: 24893

Re: LVDS Interface

<t>Laptop panels are cheap, especially if you're a frequenter of eBay.<br/> <br/> Adding LVDS interface would probably bump up the cost quite a fair bit.<br/> <br/> However, interfacing with LVDS panels can reduce electronic waste and give a new lease of life to dead laptops.<br/> <br/> Does anyone ...
by RITRedbeard
Tue Aug 02, 2011 3:48 am
Forum: General discussion
Topic: What have we missed?
Replies: 286
Views: 41599

Re: What have we missed?

Quote from eben on August 1, 2011, 23:05

We've played Q3 on this chip on a different (non-RP) board.


I wonder if the SDL library is cross platform compatible to ARM?

Might have to start writing some code :)
by RITRedbeard
Mon Aug 01, 2011 6:27 am
Forum: Staffroom, classroom and projects
Topic: REAL computer science classes in high school
Replies: 8
Views: 2284

Re: REAL computer science classes in high school

<t>I'm a computer science undergrad. I've been working doing what I guess you would call "desktop support" and learning it all myself or through my uncle for about fifteen years.<br/> <br/> What my high school lacked was any sort of class or program that trained students or opened doors to programmi...
by RITRedbeard
Mon Aug 01, 2011 6:15 am
Forum: General discussion
Topic: What have we missed?
Replies: 286
Views: 41599

Re: What have we missed?

<t>Quote from eben on July 27, 2011, 22:52<br/> Quote from tsamb on July 27, 2011, 22:34<br/> Hi Eben,<br/> <br/> What's the pixel clock of the GPU? Can it output at 1920x1080 (or 1920x1200) at 60Hz?<br/> <br/> Also, a combo WiFi/Bluetooth chip would be nice...<br/> <br/> <br/> <br/> Specs on the GP...

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