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by WizardOfOZ
Tue Nov 15, 2011 4:04 pm
Forum: General discussion
Topic: Finalised PCB design now on the front page
Replies: 90
Views: 15138

Re: Finalised PCB design now on the front page

<r>An official \"<I><s>[i]</s>Wo-hoo!<e>[/i]</e></I>\" for GPIO on a 0.1\" header. Much rejoicing was had amongst the solder slingers. <E>:D</E><br/> <br/> Given the size of the board, then in a pinch you could even use that header as a mounting point if mounting holes turns out not to be feasible i...
by WizardOfOZ
Mon Nov 14, 2011 11:12 am
Forum: Off topic discussion
Topic: YOU SUCK: the venting thread
Replies: 948
Views: 193023

Re: YOU SUCK: the venting thread

<r>Just realized yet another community surrounding a favorite internet watering hole has died. <E>:(</E><br/> <br/> Reason appear to be one of the usual stories as well: Overly clever dude discover thriving internet community of creative individuals, and decides to monetize the effort of others for ...
by WizardOfOZ
Tue Nov 08, 2011 4:11 pm
Forum: Other projects
Topic: Break out board (GPIO, SPI, I2C, and UART)
Replies: 189
Views: 51045

Re: Break out board (GPIO, SPI, I2C, and UART)

<r>It feels to me there may be a misunderstanding or two brewing here somewhere. No-one said people shouldn't make Arduino compatible boards when appropriate, quite the contrary. What gbulmer and I said was that *we* reserve the right not to do so. I posted what I did to prevent the opposite situati...
by WizardOfOZ
Mon Nov 07, 2011 9:00 pm
Forum: Other projects
Topic: Break out board (GPIO, SPI, I2C, and UART)
Replies: 189
Views: 51045

Re: Break out board (GPIO, SPI, I2C, and UART)

<t>I explicitly reserve the right to *break* Arduino shield compatibility when deemed necessary. Sorry.<br/> <br/> The original Arduino shield pinout is extremely poorly thought out, if you intend to use the I/O pins for high speed I/O and other critical applications. There is hardly *any* ground co...
by WizardOfOZ
Sun Nov 06, 2011 9:33 am
Forum: General programming discussion
Topic: Educational Programming Language
Replies: 73
Views: 26869

Re: Educational Programming Language

<r>Something to keep in mind while you debate $FAVORITE_LANGUAGE is that the environment is just as important as the programming language. I seriously doubt it is a coincidence that many individuals, who started programming on the 8 bit machines of yesteryear, are today actually quite accomplished a...
by WizardOfOZ
Sat Nov 05, 2011 7:29 pm
Forum: General discussion
Topic: Maybe this is already answered somewhere, but
Replies: 10
Views: 1686

Re: Maybe this is already answered somewhere, but

<r>I must be strange, because I would actually enjoy it, if I somehow managed to not get one from the first batch. Because that would mean they sell like hotcakes, which I believe would be a good thing.<br/> <br/> In fact I am fairly confident I will manage to survive, even if I have to wait until s...
by WizardOfOZ
Sat Nov 05, 2011 12:02 pm
Forum: Off topic discussion
Topic: Heads-up on BitTorrent and ThePirateBay.
Replies: 9
Views: 2329

Re: Heads-up on BitTorrent and ThePirateBay.

<t>Just a quick heads up for everybody:<br/> <br/> People wishing to distribute data and software for the Pi via BitTorrent, may wish to avoid using thepiratebay.org as the tracker site. As a result of court action thepiratebay.org have already been blocked at the ISP level in several countries, Den...
by WizardOfOZ
Fri Nov 04, 2011 11:54 am
Forum: Staffroom, classroom and projects
Topic: Raspberry pi, computer science tool for the masses?
Replies: 31
Views: 10961

Re: Raspberry pi, computer science tool for the masses?

<r>I have to say, I am somewhat puzzled by some of the comments in this thread. I do wonder if the world looks that much different where-ever people live, compared to here in little Denmark.<br/> <br/> *) Slight detour: Wired network versus wireless:<br/> <br/> - Wireless is problematic in many inst...
by WizardOfOZ
Wed Nov 02, 2011 9:25 pm
Forum: General discussion
Topic: Demo scene?
Replies: 33
Views: 10942

Re: Demo scene?

<r>One thing I am really hoping for, when it comes to the Raspi project, is that the platform may convince young people to start writing efficient programs again, demos included. I have to admit that all the requests for more RAM and whatnot on the Raspi calls up a message from years gone by. Some o...
by WizardOfOZ
Wed Nov 02, 2011 11:04 am
Forum: Other projects
Topic: RPVA -- Raspberry Pi VAR (Value Added Reseller) Assn
Replies: 14
Views: 3225

Re: RPVA -- Raspberry Pi VAR (Value Added Reseller) Assn

<t>Translation: "Official VARs will have to pay a non-trivial amount to the Raspi foundation per time to be recognized as such. Small players, individuals and start-ups without huge war chests need not apply. This is for well established companies only."<br/> <br/> Feedback: Not a chance.<br/> <br/>...
by WizardOfOZ
Tue Nov 01, 2011 7:43 pm
Forum: Off topic discussion
Topic: Most Recent Purchase Thread
Replies: 23
Views: 7229

Re: Most Recent Purchase Thread

<r>Just paid for some electronics parts for an upcoming project. Included among other items were:<br/> <br/> 2x AD603AQ<br/> 2x AD8703<br/> 5x 2N5179<br/> 2x 10.7MHz crystal filters, 30KHz wide @ -3dB.<br/> <br/> Now, anyone got a spare POS-200 (with or without ´+´ ) they wish to part with? <E>:)</E...
by WizardOfOZ
Tue Nov 01, 2011 7:05 pm
Forum: Other projects
Topic: Create simple vector library
Replies: 22
Views: 9103

Re: Create simple vector library

<r>If the hardware can support it, then a 'true' multiply/accumulate vector operation, possibly with power-of-two moduli on the array indices, would be nothing short of awesome. Don't mind the interface nor synchronous operation.<br/> <br/> Think realtime audio FIR filters with a silly number of tap...
by WizardOfOZ
Tue Nov 01, 2011 6:29 am
Forum: Staffroom, classroom and projects
Topic: RasPi for Higher Ed Radio Astron
Replies: 17
Views: 7143

Re: RasPi for Higher Ed Radio Astron

Come to think of it, you might even be able to do 'real' radio astronomy with a classroom setup having a maximum bandwidth of, say, 1 MHz. If you keep this application in mind when designing your AM receiver front end, you might also be able to use the setup to hunt for whistlers.
by WizardOfOZ
Tue Nov 01, 2011 5:44 am
Forum: Staffroom, classroom and projects
Topic: RasPi for Higher Ed Radio Astron
Replies: 17
Views: 7143

Re: RasPi for Higher Ed Radio Astron

OK, that sounds a lot more reasonable. Hope you will keep us posted on your progress with these projects.
by WizardOfOZ
Tue Nov 01, 2011 12:09 am
Forum: Other projects
Topic: R-Pi magazine out now (cough)
Replies: 21
Views: 8137

Re: R-Pi magazine out now (cough)

<r>Lacks article on how to connect GPIO port to '06 vintage (or later) BMW engine MCUs, increasing fuel efficiency by 32%. Requires solder, wire, two resistors and an opto-coupler type 4N26. <E>:D</E><br/> <br/> When is the first official release due? How may will you be printing? Can I get the exte...
by WizardOfOZ
Mon Oct 31, 2011 11:52 pm
Forum: Off topic discussion
Topic: PCB woes!
Replies: 21
Views: 5607

Re: PCB woes!

<t>@abishur, Yup, the linear version of the battery charger doesn't look too difficult to implement, seems rather harmless.<br/> <br/> However your other project idea may not be as simple as that. While the number of parts is quite low, the technical requirements may be harder to meet. When we start...
by WizardOfOZ
Mon Oct 31, 2011 10:25 pm
Forum: Staffroom, classroom and projects
Topic: RasPi for Higher Ed Radio Astron
Replies: 17
Views: 7143

Re: RasPi for Higher Ed Radio Astron

<t>I'm missing something here.<br/> <br/> If you want the Nyquist rate to match a 100MHz bandwidth of the digitized signal, then your ADC needs to run at at least 200 Msa/s. At 8 bit/sample you'd be hard pressed to push that through gigabit Ethernet, and the Raspi model B 'only' has 100Mb networking...
by WizardOfOZ
Sun Oct 30, 2011 6:45 am
Forum: Off topic discussion
Topic: PCB woes!
Replies: 21
Views: 5607

Re: PCB woes!

PS: There appear to be a critical error in the schematic for the example switching regulator, figure 5, in the DS2715 datasheet. It won't work as presented if you made a PCB based on it.
by WizardOfOZ
Sun Oct 30, 2011 6:17 am
Forum: Off topic discussion
Topic: PCB woes!
Replies: 21
Views: 5607

Re: PCB woes!

<t>Quote from abishur on October 30, 2011, 04:23<br/> Thanks for the tips, does anyone know a good resource for learning how to look at a circuit schematic and turn that into a PCB design?<br/> While I would love to be proven wrong, my suspicion is that you won't find any, assuming you are talking a...
by WizardOfOZ
Sun Oct 23, 2011 12:08 am
Forum: Other projects
Topic: 9v Battery Power
Replies: 9
Views: 10131

Re: 9v Battery Power

A quick calculation gives 25 minutes of running time to 6.5V @ 500mA on an Energizer 522, assuming zero internal resistance. Which won't ever happen, so in reality you will get much less. With factory fresh brand name batteries.
by WizardOfOZ
Sat Oct 22, 2011 4:34 pm
Forum: Off topic discussion
Topic: Fedora with No GUI ?
Replies: 32
Views: 6821

Re: Fedora with No GUI ?

<t>With all due respect, then I would kindly suggest we go for the ball, and not the player in this case.<br/> <br/> OP wish to use the Raspi for a stand alone TV appliance. Whether his UNIX terminology - or my own - lives up to RFC xyzw as to what is called the X server - or process or whichever - ...
by WizardOfOZ
Sat Oct 22, 2011 3:42 pm
Forum: Off topic discussion
Topic: Fedora with No GUI ?
Replies: 32
Views: 6821

Re: Fedora with No GUI ?

Do you or do you not need the X server running on a stand alone computer with no network connection, if you want GUI/video output from, say, a video player/3D game etc.?
by WizardOfOZ
Sat Oct 22, 2011 3:18 pm
Forum: Off topic discussion
Topic: Fedora with No GUI ?
Replies: 32
Views: 6821

Re: Fedora with No GUI ?

<t>Quote from kme on October 22, 2011, 16:07<br/> No, X doesn't need to be running, but it does need to be installed (with libs). There is no problem in having a text-only console and remotely run GUI programs from this sever (like in ssh -X ... or using NX/Thinlinc).<br/> Hmm, OK. Think I may have ...
by WizardOfOZ
Sat Oct 22, 2011 3:08 pm
Forum: Off topic discussion
Topic: Fedora with No GUI ?
Replies: 32
Views: 6821

Re: Fedora with No GUI ?

<t>Come to think of it, then you also need to check whether you can actually get the source code for boxee (doesn't look that way to me). The Raspi doesn't have an Intel compatible processor, so it won't run binaries intended for x86 CPUs. The Wikipedia page for Boxee states that support for ARM pro...
by WizardOfOZ
Sat Oct 22, 2011 2:48 pm
Forum: Off topic discussion
Topic: Fedora with No GUI ?
Replies: 32
Views: 6821

Re: Fedora with No GUI ?

<t>Generally speaking any graphical program will need to have the X server running, as it is that part of Linux, which provides the services required for things like video players, 3D games, word processors, graphics editors etc.<br/> <br/> Exceptions do exist, where a program talks directly to a lo...

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