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by rurwin
Fri Jan 27, 2012 9:10 am
Forum: Off topic discussion
Topic: Pedant Engineer Vent :)
Replies: 58
Views: 9744

Re: Pedant Engineer Vent :)

<t>kme said: <br/> <br/> The volume unit liter...<br/> And still for the same reason: meter is m, not M.<br/> <br/> <br/> It's litre and metre. A meter is an instrument.<br/> <br/> They're our units, the Americans don't like them anyway, so how come they get to decide to spell them differently?<br/>...
by rurwin
Thu Jan 26, 2012 1:36 pm
Forum: Other projects
Topic: Cases for the Raspberry Pi
Replies: 866
Views: 392651

Re: Cases for the Raspberry Pi

<t>Here's a really cheap alternative:<br/> <br/> Two scraps of perspex 97mm x 68mm (loads on eBay, £2-£3 for an A4 sized piece)<br/> <br/> Six M3 x 25mm nylon spacers £0.35 each = £2.10<br/> <br/> Eight countersunk M3 machine screws<br/> <br/> Four scraps of felt or other padding and glue to attach ...
by rurwin
Wed Jan 25, 2012 3:59 pm
Forum: General discussion
Topic: The Starfish
Replies: 0
Views: 698

Re: The Starfish

<t>The storm had ended in the night, and the dawn was clear and fresh. The old man ambled along the beach, more for the enjoyment of walking than to get anywhere important. The eastern sky was painted rose in welcome to the sun, not yet peeking over the distant horizon. The air was chill, bracing an...
by rurwin
Wed Jan 25, 2012 12:52 pm
Forum: General discussion
Topic: sockets on next board
Replies: 13
Views: 3457

Re: sockets on next board

No
by rurwin
Wed Jan 25, 2012 12:14 pm
Forum: General discussion
Topic: Will there be a heads up about the launch?
Replies: 60
Views: 16614

Re: Will there be a heads up about the launch?

I'm not convinced they will bother, but I wondered whether they should split the sale into two halves and schedule them to start at 9am and 9pm GMT. That would be comfortable for most people, and reasonably practical for all.
by rurwin
Wed Jan 25, 2012 12:04 pm
Forum: General discussion
Topic: sockets on next board
Replies: 13
Views: 3457

Re: sockets on next board

<t>Agreed; it is going to be a pain. It would be nice if you could slide it into a case. As it is you will probably have to ease it in on the slant, or build at least two sides of the case around it.<br/> <br/> On the other hand, it is not designed to be mounted anywhere long-term or industrially. I...
by rurwin
Wed Jan 25, 2012 11:55 am
Forum: General discussion
Topic: Latency on home page
Replies: 3
Views: 909

Re: Latency on home page

<r>Maybe you already know...<br/> <br/> If you look up at the top of the page, there is some text that reads "__ Topics with Unread Posts". If you click the icon next to that it takes you to <URL url="http://www.raspberrypi.org/for...../newposts/">http://www.raspberrypi.org/for...../newposts/</URL> ...
by rurwin
Wed Jan 25, 2012 11:37 am
Forum: General discussion
Topic: Is it possible to run mac os 10.2 on it?
Replies: 47
Views: 11992

Re: Is it possible to run mac os 10.2 on it?

stevenbtje said:


Or is it possible to run other os software on it?


QNX possibly with a bit of work. But you wouldn't want to; it's just like Linux except it's hard real-time.
by rurwin
Wed Jan 25, 2012 10:58 am
Forum: General discussion
Topic: How programmeable is it?
Replies: 9
Views: 2417

Re: How programmeable is it?

To avoid having to build anything, you could mount one of these on it.
by rurwin
Wed Jan 25, 2012 10:52 am
Forum: Off topic discussion
Topic: Pi Character
Replies: 84
Views: 16459

Re: Pi Character

<t>I was all set to write the prequel to the sleepover code in COBOL, because I wanted to use<br/> <br/> <br/> PERFORM POUT THU SLAMDOOR UNTIL DAD AGREES<br/> <br/> <br/> But I realised that I didn't know enough COBOL to do it. I started to read a COBOL language reference but had to stop before I lo...
by rurwin
Wed Jan 25, 2012 9:57 am
Forum: General discussion
Topic: ArchLinux ARM difficulties...
Replies: 31
Views: 6851

Re: ArchLinux ARM difficulties...

<t>True, but it is a table with the same number of entries, just more bits per entry. (Although I see FAT32 only uses 28 bits.) So the reasoning still stands.<br/> <br/> So much for trusting knowledge you thought you knew twenty years ago <br/> <br/> Edit: I've just looked at those scripts, and I do...
by rurwin
Wed Jan 25, 2012 7:34 am
Forum: General discussion
Topic: Interfacing with peripherals
Replies: 8
Views: 2730

Re: Interfacing with peripherals

<t>jwatte said: <br/> <br/> you only really need better resolution if you're doing something skanky, like emulating a serial bus by twiddling a pin.<br/> Not true. You can do some amazing things if you can run a control loop at 5kHz, but even at only 100Hz, 2ms of (unknown) jitter in your I/O timing...
by rurwin
Tue Jan 24, 2012 4:47 pm
Forum: General discussion
Topic: Solar Power
Replies: 54
Views: 15010

Re: Solar Power

<r>hsoftdev17 said: <br/> <br/> <br/> <URL url="http://www.amazon.com/Brunton-.....038;sr=8-4">http://www.amazon.com/Brunton-.....038;sr=8-4</URL><br/> <br/> These are expensive, but have a much better shot at running a RPi.  They claim a max of 800mA at 5v so you may be starving the RPi in less tha...
by rurwin
Tue Jan 24, 2012 4:18 pm
Forum: General discussion
Topic: RasPi power from Nerdkit USB lead
Replies: 8
Views: 1884

Re: RasPi power from Nerdkit USB lead

Sorry I assumed you were intending to turn the lead the other way around, and connect the free ends to a proper 5V power supply. That's what I would do with it.

Hmmm. 10+11=101...
by rurwin
Tue Jan 24, 2012 3:08 pm
Forum: General discussion
Topic: RasPi power from Nerdkit USB lead
Replies: 8
Views: 1884

Re: RasPi power from Nerdkit USB lead

I believe you want this:

http://en.wikipedia.org/wiki/USB
by rurwin
Tue Jan 24, 2012 2:15 pm
Forum: General discussion
Topic: Solar Power
Replies: 54
Views: 15010

Re: Solar Power

<t>In response to the OP, the panel appears to generate 100mA so, in bright direct sunlight and ignoring charging efficiency, it will power the RPi for one seventh of the time you left it in the sun. More like two thirds that because of the charging efficiency, and much much less if it isn't in dire...
by rurwin
Tue Jan 24, 2012 1:54 pm
Forum: General discussion
Topic: Only one Power Adapter
Replies: 21
Views: 6414

Re: Only one Power Adapter

<t>Something like this maybe?<br/> <br/> Building a power distribution box would be a nice first project for someone just getting started with a soldering iron.<br/> <br/> <br/> Or devices that have an output of 2 amps, so maybe would fry some components…<br/> <br/> <br/> It's the voltage and the ma...
by rurwin
Tue Jan 24, 2012 10:13 am
Forum: General discussion
Topic: Suggested small displays
Replies: 18
Views: 32486

Re: Suggested small displays

Have a look on eBay. There are loads of companies importing stuff from China. For £119 you can get an 8-inch HDMI touchscreen.
by rurwin
Tue Jan 24, 2012 10:09 am
Forum: General discussion
Topic: Brainwave! (I think)
Replies: 11
Views: 2448

Re: Brainwave! (I think)

<t>I have been looking at projectors and also small HDMI screens, and I concluded that it just is not reasonable in line with the cost of the RPi. Low cost projectors exist, but they get universally bad reviews -- they are not bright enough to see at a decent size or in a room that is not dark. For ...
by rurwin
Tue Jan 24, 2012 8:58 am
Forum: General discussion
Topic: ArchLinux ARM difficulties...
Replies: 31
Views: 6851

Re: ArchLinux ARM difficulties...

<t>jreidsma said: <br/> <br/> Does the 16 or 32 mean the bit of the computer?<br/> No. FAT stands for File Allocation Table. That is a table stored in the partition that has one bit for every block of the partition. If the bit is 1 then the block is used, if it is 0 then the block is free. FAT16 has...
by rurwin
Mon Jan 23, 2012 12:40 pm
Forum: Other projects
Topic: STICKY: Beta Boards mechanical data
Replies: 72
Views: 98005

Re: Beta Boards mechanical data

<t>That's a fair point. I was assuming it would come no further than the silkscreen shows it. The same technique should be useful; the bridge could be moved back about 4mm, or the pillars could be moved closer to the edge of the board by about the same amount. But those reduce the error margin and m...
by rurwin
Sun Jan 22, 2012 9:31 pm
Forum: Other projects
Topic: STICKY: Beta Boards mechanical data
Replies: 72
Views: 98005

Re: Beta Boards mechanical data

<t>Thanks. So probably 1mm or pillars. I'll take a look at the photos.<br/> <br/> Edit: done.<br/> <br/> The photos of the beta boards need to be corrected for perspective before measurements can be taken from them. I have done that, and the results can be found here. I think they can be trusted to ...
by rurwin
Sun Jan 22, 2012 8:35 pm
Forum: General discussion
Topic: Resource for learning about linux?
Replies: 33
Views: 6811

Re: Resource for learning about linux?

I think one small link got lost in the noise. So here it is again.

Cracknel said:

http://tldp.org/
And particularly the Introduction to Linux - A Hands on Guide
by rurwin
Sun Jan 22, 2012 6:19 pm
Forum: General discussion
Topic: Raspberry Pi for commercial use
Replies: 27
Views: 14283

Re: Raspberry Pi for commercial use

<t>To clarify, or obfuscate, John Beetem's reply...<br/> <br/> The Linux kernel has a GPL clarification which explicitly says it can be used with commercial applications without requiring that the application source-code is divulged. Most libraries use the LGPL or similar with the same effect.<br/> ...
by rurwin
Sun Jan 22, 2012 3:56 pm
Forum: Staffroom, classroom and projects
Topic: composite resolution too low to be of use for programming?
Replies: 62
Views: 21807

Re: composite resolution too low to be of use for programming?

<t>From memory, if you can use composite video, then you can use 80x24 (eg BBC micro mode 0 was 80x32 or 640x256 pixels). It isn't perfect, there is quite a bit of bleeding, but it is usable. A cheap TV could render 40x24 very well and that is what most of the micros of the time used as standard. If...

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