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by rrmcbeth
Fri Aug 17, 2012 12:13 pm
Forum: General discussion
Topic: TFT touch screen
Replies: 3
Views: 2251

Re: TFT touch screen

Only after a LOT of hardware and software development.
by rrmcbeth
Thu Jun 07, 2012 1:28 pm
Forum: Off topic discussion
Topic: XFX 8600GT Capacitors Popped
Replies: 8
Views: 2155

Re: XFX 8600GT Capacitors Popped

Electrotic capaicitors "pop" because they are installed in the reverse polarity and build up pressure inside. In a production run this is unusual. Don't loose any sleep.
by rrmcbeth
Thu May 24, 2012 4:33 pm
Forum: General discussion
Topic: Display
Replies: 5
Views: 1145

Display

Seems to me there is a very strong need for a low cost display. Perhaps two versions one with a touch screen and one without. Should plug into the HDMI port and use external power. Say about a 12" -14" screen.

Any ideas out there in pi land?
by rrmcbeth
Wed May 23, 2012 9:08 pm
Forum: General discussion
Topic: Kit of parts
Replies: 3
Views: 1170

Re: Kit of parts

I really don't think you want to try to hand solder these SMT parts to the board!

Mac
by rrmcbeth
Tue May 01, 2012 8:09 pm
Forum: Other projects
Topic: New Aluminum RPi Case/Enclosure
Replies: 15
Views: 8543

Re: New Aluminum RPi Case/Enclosure

Yea, I'm interested.  Like jbeale pointed out you need an opening for an I/O cable.  Make sure there are no sharp edges.

The important thing here is that you don't need to spend $10K to $20K for a tool and your basic material cost is low.
by rrmcbeth
Tue Apr 24, 2012 12:44 pm
Forum: Staffroom, classroom and projects
Topic: PiBasic
Replies: 27
Views: 6341

Re: PiBasic

<t>Actually I started writing assembly code before there were nice assembler programs. Remember the S-100 bus, the 8080 and the RCA 1802 CPU?<br/> <br/> However, that being said, how about a series of Python's that progress in complexity from something like the very simple 'basic like' commands prog...
by rrmcbeth
Mon Apr 23, 2012 2:06 pm
Forum: General discussion
Topic: Mini-Pi
Replies: 19
Views: 4634

Re: Mini-Pi

<t>OK, has anyone sat down and really calculated the cost of a functioning system?<br/> <br/> Well, by the time you get all the peripherals, power supplies, and cables you need it comes up between $200 to $250.   Unless you have these items sitting around.<br/> <br/> I know the board is cheap but th...
by rrmcbeth
Mon Apr 23, 2012 12:56 pm
Forum: General discussion
Topic: Mini-Pi
Replies: 19
Views: 4634

Re: Mini-Pi

<t>For Embedded applications:<br/> <br/> You don't need - HDMI, RCA Composite, SD cards and Operating Systems with  full keyboards/mice.<br/> <br/> You need - Lots of I/O ports, I/O channels like RS232 ... etc., Ethernet, 1 or 2 USB posts,  a way to load compiled software into embedded flash memory,...
by rrmcbeth
Sat Apr 21, 2012 12:46 pm
Forum: Other projects
Topic: Concept for a case
Replies: 121
Views: 72663

Re: Concept for a case

<t>I agree with AlastairoRP that the cable should come out the side to allow for stacking.  Suggestion:  The slot for the cable could go along the line between the cover and the bottom.  That eliminates the cover snap.  This could be moved to SD end.   The cable slot should also be  thick enough to ...
by rrmcbeth
Wed Apr 18, 2012 1:19 pm
Forum: Other projects
Topic: Raspberry Pi in space! Need advice :)
Replies: 25
Views: 6071

Re: Raspberry Pi in space! Need advice :)

<t>Please list the signals you need transmitted?   From your first post I get:<br/> <br/> 1) GPS, 2) Altitude, Anything Else?<br/> <br/> You also want to store images from 2 video cameras on board for later retrieval. Is this correct?   I'm a little curious,  what you expect to see up there.  And wh...
by rrmcbeth
Wed Apr 18, 2012 12:47 pm
Forum: Other projects
Topic: Berry Box - The Transparent Case
Replies: 105
Views: 41267

Re: Berry Box - The Transparent Case

Wow! I was off by a factor of about 150.   How is this calculated?   How many parallel floating point circuits does it have?   Is there a good description on the inner block diagram of the chip somewhere on the WEB?
by rrmcbeth
Tue Apr 17, 2012 6:43 pm
Forum: Other projects
Topic: Raspberry Pi in space! Need advice :)
Replies: 25
Views: 6071

Re: Raspberry Pi in space! Need advice :)

<t>Yes, the RPi might be a real overkill.  A PIC 16xx series with a UART will only take a milliamp or so.  Would save weight, size and battery power.<br/> <br/> A UART is a Universal Serial Receiver Transmitter for data.  Basically a very easy way to get a serial stream of 8 bit data from point A to...
by rrmcbeth
Tue Apr 17, 2012 4:14 pm
Forum: Other projects
Topic: Raspberry Pi in space! Need advice :)
Replies: 25
Views: 6071

Re: Raspberry Pi in space! Need advice :)

<t>The I/O hardware port on the RPi has a UART on it. As the data you have is not very fast you could use the UART transmit signal to modulate your radio.  The radio receiver would reproduce this UART signal and you could  extract the data and send it to the map software.   This sounds easy but ther...
by rrmcbeth
Sat Apr 14, 2012 8:55 pm
Forum: Other projects
Topic: Berry Box - The Transparent Case
Replies: 105
Views: 41267

Re: Berry Box - The Transparent Case

<t>I have no idea.  A GFLOP is 1,000,000,000 floating point operation/sec.  A MFLOP = 1,000,000 per seconds. The RPi has embedded math hardware.  So lets make some assumptions:<br/> <br/> 1)   Clock = 700 mHz<br/> <br/> 2)   1 Instruction cycle = 2 clock cycles.<br/> <br/> 3)   A Flop instruction  =...
by rrmcbeth
Sat Apr 14, 2012 2:14 pm
Forum: Other projects
Topic: Berry Box - The Transparent Case
Replies: 105
Views: 41267

Re: Berry Box - The Transparent Case

<t>It's possible that someone may want to build a "Super Computer" using multiple RPi's.   I believe that some post grad students built one using 64 PC's.  Just think how low cost, low power and small physical size it would be.<br/> <br/> One of the first digital computers (the ENIAC) was built in t...
by rrmcbeth
Fri Apr 13, 2012 4:21 pm
Forum: Other projects
Topic: Berry Box - The Transparent Case
Replies: 105
Views: 41267

Re: Berry Box - The Transparent Case

<t>Well, somewhere I read that it would be shipped without the header to keep costs down.  I guess we need a clarification from the Foundation.<br/> <br/> Stacking:<br/> <br/> 1)  I/O cables need to extend through the side of the box so they do not interfere with the box stacked on top.<br/> <br/> 2...
by rrmcbeth
Fri Apr 13, 2012 1:44 pm
Forum: Other projects
Topic: Berry Box - The Transparent Case
Replies: 105
Views: 41267

Re: Berry Box - The Transparent Case

<t>Greetings All,  Seems my postsdisappeared into the mist around the cloud.  I'll try again.  The following are some observations onstacking box’s and adding proto boards:<br/> <br/> <br/> <br/> Stacking – Stacking boxes on top<br/> of each other will cause the heat to rise due to the chimney effec...
by rrmcbeth
Thu Apr 05, 2012 9:51 pm
Forum: Other projects
Topic: Design Case for the Raspberry Pi
Replies: 98
Views: 34808

Re: Design Case for the Raspberry Pi

If the slit (top/bottom) lined up with a flat cable as it extended from a connector then an opening for the cable could be made along that line.   And the cable would extend out the side with the RCA plug.

This is a great looking case.  Good work!
by rrmcbeth
Thu Apr 05, 2012 2:03 pm
Forum: Other projects
Topic: Design Case for the Raspberry Pi
Replies: 98
Views: 34808

Re: Design Case for the Raspberry Pi

You may have taken this into account. But I don't see a way to extend a flat cable from the GPIO connector.  -  Mac

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