Feeds

Psst, kid... Wanna learn how to hack?

The £25 computer to teach youngsters real computing skills

Business security measures using SSL

Productivity on the cheap

The Pi team has spent months and months hunting for components that meet the right balance of size, cost and quality: go too small and the price can end up soaring, go too big and the PCB suddenly costs too much, go too cheap and standards slip. A 2mm wide capacitor (0805 packaged 10uF) can be ten times cheaper than a 1.6mm wide part (0603 package), for example, and then there's the bill for the robotic component placement in the factory, which is affected by design decisions - maybe two capacitors could be replaced by a larger one. These little savings, a penny at a time, add up for a $35 device that's being produced (at least, initially) in modest batches of 10,000 units at a time.

"Our desire is to kill off even components that cost a few tens of cents as, after all, each 25 cents is 1 per cent of our price," Eben Upton, a trustee of the RaspberryPi Foundation that's producing the board, told The Register.

He added:

Your baseline, unavoidable cost is some RAM and an application processor. Depending on the choices you make, this is going to cost the best part of $15, and then you're looking at a few dollars of board, connectors, assembly and margin. So we've gone pretty much as low as you can reasonably go.

I believe pretty strongly that the "natural" long-term price of a productivity computer is under $50 plus a display.

RaspberryPi gerber file

The RaspberryPi production board PCB layout (Click for unlabelled version) Legend: 1. Misc I/O pins 2. RCA video out 3. Audio out 4. Status LEDs 5. USB 2.0 port 6. Ethernet port 7. JTAG pins 8. LAN/USB controller chip 9. HDMI out 10. Broadcom processor package 11. Underside SD card slot 12. microUSB power in

Eventually the timing circuits for the network and USB ports will be derived from a signal from the BCM2835 graphics processor rather than a clumsy external crystal oscillator. The Pi also slurps its power from a 5V micro USB socket, rather than an onboard PSU, in another bid to drive down the cost - an engineering decision taken within the past couple of months. There are all sorts of adjustments the team hope to make in future board revisions. Upton added:

The main challenge has been to get a high-quality signal escape from the BCM2835 processor, without loading the board up with lots of layers and high-density interconnect features (such as buried vias, etc). In principle there's nothing stopping us from going smaller, except that we would start sacrificing connectors and/or moving to less robust connector formats like micro SD and mini HDMI.

By and large, it's been a continuous process of small improvements and cost optimisations; Pete Lomas (one of our trustees, and MD of Norcott Technologies in Cheshire) has spent a lot of time working iteratively with potential suppliers to find cheap, decent quality components (particularly connectors). Pete has been working on sourcing components since at least May of this year, if not before, and has only recently come up with a configuration which he feels is near optimal. Silicon chip sourcing is simply a matter of what we can get our hands on that fits the target price and gives the best performance.

RaspberryPi Atmel prototype

RaspberryPi Atmel-powered prototype

The Pi has certainly come from very humble beginnings: a 2006 prototype used an Atmel ATmega644 micro-controller, an 8-bit beast running at 22MHz with 64KB of flash memory, and 512K of static RAM mainly for the video frame buffer. A RaspberryPi in a USB key stick with a little camera fitted was demonstrated earlier this year, but the design was put on pause because it lacked the connectivity present on the latest boards.

New hybrid storage solutions

More from The Register

next story
Half a BILLION in the making: Bungie's Destiny reviewed
It feels very familiar - but it's still good
Apple's big bang: iPhone 6, ANOTHER iPhone 6 Plus and WATCH OUT
Let's >sigh< see what Cupertino has been up to for the past year
Huawei ditches new Windows Phone mobe plans, blames poor sales
Giganto mobe firm slams door shut on Microsoft. OH DEAR
A SCORCHIO fatboy SSD: Samsung SSD850 PRO 3D V-NAND
4Gb/s speeds on a consumer drive, anyone?
Phones 4u website DIES as wounded mobe retailer struggles to stay above water
Founder blames 'ruthless network partners' for implosion
Get your Indian Landfill Android One handsets - they're only SIXTY QUID
Cheap and deafening mobes for the subcontinental masses
Apple's SNEAKY plan: COPY ANDROID. Hello iPhone 6, Watch
Sizes, prices and all – but not for the wrist-o-puter
prev story

Whitepapers

Providing a secure and efficient Helpdesk
A single remote control platform for user support is be key to providing an efficient helpdesk. Retain full control over the way in which screen and keystroke data is transmitted.
Saudi Petroleum chooses Tegile storage solution
A storage solution that addresses company growth and performance for business-critical applications of caseware archive and search along with other key operational systems.
Security and trust: The backbone of doing business over the internet
Explores the current state of website security and the contributions Symantec is making to help organizations protect critical data and build trust with customers.
Reg Reader Research: SaaS based Email and Office Productivity Tools
Read this Reg reader report which provides advice and guidance for SMBs towards the use of SaaS based email and Office productivity tools.
Security for virtualized datacentres
Legacy security solutions are inefficient due to the architectural differences between physical and virtual environments.