Soronlin

This song is in honour of the hard work that the Raspberry Pi Foundation has put in in bringing the Raspberry Pi to market, and especially for Liz, who fielded idiot questions with patience beyond the call of duty.

Thanks to dukla2000 for the first five lines.

Wednesday morning at five o'clock as the day begins
Silently closing our bedroom doors
Trusting the note that we hoped would say more
We go downstairs to the PC
Clutching our Barclaycards
Frantically hitting the F5 key
Telling the shop that it"s me

Liz… (we gave her absolute hell)
Is sleeping (first time in 48 hours)
At last (automated servers unsupervised)
She's sleeping at last after working so hard for so many days (well done)

Father snores as his wife logs into the RaspPi shop
Clicks on the Raspberry that's just appeared
Sitting alone at the PC screen
She breaks down and cries to her husband
"Dad, all the stock is gone
"Why would they treat us so thoughtlessly?
"How could they do this to me?"

Liz… (we drove her right up the wall)
Is sleeping (dreaming of raspberry pie)
At last (Raspberry shop can run out of stock by itself)
She's sleeping at last after working so hard for so many days (well done)

Friday morning, at nine o'clock
Liz is back at her desk
Posting the blog that they're waiting for
Another 10k in two weeks

She (we knew she would come up trumps)
Is having (we thought we'd be waiting for months)
Fun (fun is one thing money can"t buy)

Computer is here that was just an idea for so many years…
Sh'e sleeping tight… well done.

rurwinrurwin 28 Feb 2012 13:2428 Feb 2012 14:38

In honour of the Raspberry Pi, I have rewritten an old program I first wrote over thirty years ago on a time-shared computer my school shared with every other school in Birmingham, using a 110 baud teletype.

rurwinrurwin 28 Feb 2012 13:1230 May 2012 18:48

Here's another idea for a Raspberry Pi case: two scraps of perspex and a handful of nylon spacers

rurwinrurwin 28 Feb 2012 12:5628 Feb 2012 13:02

These are perspective-corrected images of the Raspberry Pi beta boards which can be used to take measurements from. I estimate that they are accurate to within 1mm.
Note that most printer/program combinations will not print them the correct size, even if you tell them how big you want them. You will need to do some test prints and scale them by trial and error. You need them to print exactly 85mm by 56mm.

Note that these pictures cut off the connectors at the board edges. To determine where to place cutouts for the connectors, use Gert's mechanical drawings. You should use these images solely for determining where to place support structures.

PC-topside.jpgPC-underside-sq-pcb.pngI intend to use polystyrene sheet to make the box, and this is the support structure I intend to use:
PC-underside-suggested-support.png
It uses two structures: one is a shelf 20mm x 5mm on the corner of the board, the other is a bar shaped like this and placed 25mm in from the other end of the board. That's a measurement to the bar, not its centre-line.
Support%20bar.png
Note that the tops of those pillars should be padded, since there are PCB traces under it, and the padding must be taken into account when determining the height of the pillars.

In order to hold the board in place there should be another pillar bearing down on the board from above. A suitable position is above the support bar and also 25mm in from the top edge (with the video and audio connectors.) Almost directly above the Raspberry Pi logo. When the case is closed the top pillar and the bottom pillars should have a vertical gap of around 1.6mm between them (plus solder-resist and silk-screening). Remember that this should allow for compressed padding on all pillars.

In the end, the real test is if the board is held securely without flexing.

rurwinrurwin 28 Feb 2012 12:4828 Feb 2012 12:53


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