- Please note that the Raspberry Pi wiki pages on this site are a community work, the Raspberry Pi Foundation is not responsible for content on these pages
- Please note that the Raspberry Pi isn't released yet - this page is a community work in progress in preparation for the launch
The Raspberry Pi is an ultra-low-cost (~15GBP or 25USD) credit-card sized Linux computer for teaching computer programming to children. It is developed by the Raspberry Pi Foundation, which is a UK registered charity (Registration Number 1129409). The foundation exists to promote the study of computer science and related topics, especially at school level, and to put the fun back into learning computing.
We expect this computer to have many other applications both in the developed and the developing world.
- 1 Events
- 2 Hardware
- 3 Availability
- 4 Beginners guide
- 5 Accessories & Peripherals
- 6 Power management
- 7 Graphics accelerator
- 8 Display Output Options
- 9 Interfacing to Raw LCD Panels
- 10 Interfacing to Camera Module
- 11 General Purpose Input/Output (GPIO), I2C, I2S, SPI, UART
- 12 MIPI CSI-2
- 13 DSI
- 14 CEC
- 15 Software Details
- 16 FAQ
- 17 News articles and blog posts about Raspberry Pi
- 18 Links
- 18.1 Home page
- 18.2 Manuals and resources
- 18.3 Contact and communication
- 18.4 Books
- 18.5 Education & Training materials
- 18.6 Programming
- 18.7 Manufacturing
- 18.8 Compliancy
- 18.9 Shipping
- 19 Thanks
- 20 Foreign Language Translations
Raspberry Pi Staff will be attending the following events:
- eTech Ohio conference, Ohio, 14 February 2012
- Eben will be speaking at @TEDxGranta in Cambridge - Dates when we have them!
The following are general-interest industry events and are not an indication that Raspberry Pi will be attending, exhibiting or speaking at the event. For Raspberry Pi event and speaker schedule, please contact email@example.com.
- FOSDEM, 4-5 February 2012, Brussels, Belgium
- Hackademy Codecamp, 11 February 2012, Preston, UK
- eTech Ohio conference, Ohio, 14 February 2012
- O'Reilly Open Source Convention (OSCON) at Portland, Oregon Convention Center July 16-20, 2012. The Call for Papers is scheduled to be posted in November 2011.
- Cambridge Hi-Tech Association of Small Enterprises, Cambridge, UK, 5 December 2011
- [Free Software and Open Source Symposium/LinuxFest 2011, 28 October, in Toronto]
- [ARM TechCon, 26-27 October]
- Maker Faire, New York, 17 September
- Transfer Summit, Oxford - 7-8 September
- Educating Programmers Summit - 25 August 2011
- main article: Rpi Hardware
The first product is about the size of a credit card, and is designed to plug into a TV or be combined with a touch screen for a low cost tablet. It comes in two tastes, A and B, with B having more features. The expected price is 25$ for model A, and 35$ for model B. The GPIO pins on each board allow the use of optional expansion boards.
|Model A||Model B|
|Target price:||US$25 (GBP £16)||US$35 (GBP £22)|
|System-on-a-chip (SoC):||Broadcom BCM2835 (CPU + GPU + DSP + SDRAM)|
|CPU:||700 MHz ARM11 ARM1176JZF-S core|
|GPU:||Broadcom VideoCore IV, OpenGL ES 2.0, 1080p30 H.264 high-profile decode|
|Memory (SDRAM):||128 MiB||256 MiB|
|USB 2.0 ports:||1(provided by the BCM2835)||2 (via integrated USB hub)|
|Video outputs:||Composite video|Composite RCA, HDMI (not at the same time)|
|Audio outputs:||TRS connector|3.5 mm jack, HDMI|
|Audio inputs:||none, but a USB mic or sound-card could be added|
|Onboard Storage:||Secure Digital|SD / MMC / SDIO card slot|
|Onboard Network:||None||10/100 wired Ethernet RJ45|
|Low-level peripherals:||General Purpose Input/Output (GPIO) pins, Serial Peripheral Interface Bus (SPI), I²C, I²S, Universal asynchronous receiver/transmitter (UART)|
|Power ratings (provisional, from alpha board):||500mA, (2.5 Watt) ||700mA, (3.5 Watt)|
|Power source:||5V via Micro USB or GPIO header|
|Size:||85.60mm x 53.98mm (3.370 × 2.125 inch)|
Estimated availability (as of 31st December 2011) is January 2012 for the first batch of 10 000. On 31st December 2011 at 22:00, the Foundation auctioned the first two of ten beta boards on a seven-day auction. The following eight were auctioned on the following days. Initially, there will be shipping from the UK and possibly the US, but will probably expand with local distributors by the second quarter of 2012.
You've just got your new Raspberry Pi device - what now? See beginners guides.
Accessories & Peripherals
Main article: RaspberryPiBoardVerifiedPeripherals
A protective case is an often-cited required accessory. Cases are likely to be offered both directly from Raspberry Pi and from 3rd party companies such as Special Computing.
The board takes fixed 5V input, (with the 1V2 core voltage generated directly from the input using the internal switch-mode supply on the BCM2835 die). This permits adoption of the micro USB form factor, which, in turn, prevents the user from inadvertently plugging in out-of-range power inputs; that would be dangerous, since the 5V would go straight to HDMI and output USB ports, even though the problem should be mitigated by some protections applied to the input power: The board provides a polarity protection diode, a voltage clamp, and a self-resetting semiconductor fuse.
It is planned that expansion boards will be offered both by Raspberry Pi Foundation and by 3rd parties during 2012.
- The first expansion board, nicknamed Gertboard after one of the principal Hardware Engineers for Raspberry Pi, was announced on 17th December 2011: 
- On 2nd January 2012, CJE/4D announced that they have a real-time clock (RTC) expansion board in the works: 
HDMI to VGA Adaptor
The Broadcom BCM2835 only provides HDMI output and composite output. DVI-D ports used on many computer monitors can be connected to HDMI using a simple passive adapter. RGB and other signals needed by RGB, S-VIDEO or VGA connectors are however not provided so additional componenty would be needed to generate these signals. Additional componentry would push the price beyond the $25 target and therefore won't happen.
A couple of options for VGA or component RGB outputs, bridging from either HDMI or the MIPI DSI interface:
Firstly, the following *might* work. Beagleboard people have reported various levels of success (mainly "issues"):
...it may need to be modified as described here:
Alternatively, it may be possible to design an expansion board that plugs into the LCD headers on the R.Pi. Here is something similar for Beagleboard:
A manual is currently in production by members of the Computing At School working group. This began on the 13 October 2011 and is due to be ready for early March 2012. The manual is aimed at the project's target audience, children, so that they can take their "First steps in Computing Science".
For the first release (~January/February 2012), there will mostly likely be very minimal documentation. A 'schools' release is due in June/July 2012.
- Target power consumption is <1W (This is for the A version, no power consumed from the USB plug.)
Preliminary Alpha board power usage measurements. This is with graphics output on the HDMI port, no power from USB plugs.
- Input 7.5V, ~180mA Linux running only with prompt.
- Input 7.5V, ~300mA heavy graphics running on system.
The GPU is a Broadcom VideoCore IV.
Display Output Options
The following display outputs are supported on the board:
- Composite video (NTSC and PAL) via an RCA plug.
- HDMI 1.3a standard output.
- Display Serial Interface (DSI) - via unpopulated 15-way flat flex connector.
These interfaces allow the use of a broad range of displays, including:
- Televisions (HDMI or composite).
- Computer monitors (HDMI/DVI-D cable) (VGA monitors would require either a composite or HDMI to VGA scan converter box).
- DLP/Laser Pico Projectors (HDMI/DVI-D cable).
- RAW LCD panels (DSI + interfacing hardware)
- The SOC does not support any kind of analog component video, including VGA, since the SOC is designed for mobile phone use where this would not be a requirement.
- Composite and HDMI outputs can not be used at the same time (one or the other.)
Interfacing to Raw LCD Panels
Nokia N900 has 800x480 DCS LCD (afaik its like DSI, but has build in framebuffer). Replacement screen is about ~$40 (~$50 with 4pin resistive touchscreen).
Nokia N8 has AMOLED 360x640 pixels DSI LCD. Replacement screen is about ~$35, another ~$25 for Multitouch Synaptics T1021A touchscreen (I2C + interrupt IO, no docs/drivers).
Potential LVDS interfacing chips :
DVI receiver TFP401A, TFP403, or TFP501 + LVDS transmitter SN75LVDS83B or SN65LVDS93A (Mentioned earlier fit-VGA is build around TFP401A, probably many more "active" DVI2VGA cables are build the same way)
I2C/SPI ADC can be used to interface 4 pin resistive Touch Screens, For example STMPE812A
16x2 LCD Displays
The old-style 2-line, 16-character LCD displays can be commonly controlled over UART, thus providing a cheap way to display values for sensors etc.
Interfacing to Camera Module
is Sony sub-LVDS same as MIPI CSI-2? Sony IMX020 5Mbip module is available for $5-7 (SE K850i replacement camera).
Looks like Nokia N95 uses CSI-2 5Mpix camera module with autofocus. ~$15 replacement part.
General Purpose Input/Output (GPIO), I2C, I2S, SPI, UART
Production Board GPIO Header
The production board has a 26-pin 2.54mm expansion header, arranged in a 2x13 strip. They provide 8 GPIO pins plus access to I2C, SPI, UART), as well as +3V3, +5V and GND supply lines. Pin one is column 0 on the bottom row. All the UART, SPI and I2C pins can be reconfigured as GPIO pins, to provide a total of 17 GPIO pins.
Voltage levels are 3v3. There is no over-voltage protection on the board - the intention is that people interested in serious interfacing will use an external board with buffers, level conversion and analog I/O rather than soldering directly onto the main board.
At least some of the GPIO pins support PWM.
Each GPIO can interrupt, high/low/rise/fall/change.
It is also possible to reconfigure some of the pins to provide an ARM JTAG interface.
It is also possible to reconfigure some of the pins to provide an I2S or PCM interface.
It is also possible to reconfigure some of the pins to provide a second I2C interface. [no-ref]
Kernel boot messages go to the UART at 115200bps.
|Do not connect|
Colour-coded Image: https://sites.google.com/site/burngatehouse/home/drawings/GPIOs.gif
Maximum permitted current draw from the 3v3 pin is 50mA. Maximum permitted current draw from the 5v pin is the USB input current (usually 1A) minus any current draw from the rest of the board, or about 650 mA. 
The Foundation will not include a GPIO driver in the initial release, standard linux GPIO drivers should work with minimal modification. The Foundation will not include a SPI driver in the initial release, we hope the community might write one. The Foundation will not include an I2C driver in the initial release, we hope the community might provide one, standard linux I2C drivers should work with minimal modification.
On the production board, we bring out the MIPI CSI-2 interface to pads for an unpopulated 15-way flat flex connector
On the production board, we bring out the DSI interface to pads for an unpopulated 15-way flat flex connector
HDMI-CEC is supported by hardware but some driver work will be needed and currently isn't exposed into Linux userland.
Eben notes that he has seen CEC demos on the Broadcom SoC they are using.
The boards do not include NAND or NOR storage - everything is on the SD card, which has a FAT32 partition with GPU firmware and a kernel image, and an EXT2 partition with the rootfs.
We're not currently using a bootloader - we actually boot via the GPU, which contains a proprietary RISC core (wacky architecture ;) . The GPU mounts the SD card, loads GPU firmware and brings up display/video/3d, loads a kernel image, resets the SD card host and starts the ARM.
You could replace the kernel image with a bootloader image, and that would work fine.
Source code and binaries for Raspberry Pi will be available at various places from launch, including pre-built Linux distributions.
Ubuntu is currently listed as the default distribution on the Raspberry Pi website, but the Ubuntu developers have now stated they will not be supporting the ARMv6 architecture, so Ubuntu is likely to be dropped.
Eben says (regarding default distribution): "Either Ubuntu or Fedora; the main point in Fedora’s favour is their ongoing support for ARMv6 architectures."
Main page: RaspberryPiBoardDistributions
Instead of just using compiler + editor, you can use "development tool chains" which integrate compiler, build system, packaging tools etc. in one tool chain.
The Broadcom processor on Raspberry Pi contains an ARM v6 general purpose processor and a Broadcom VideoCore IV GPU. No data is currently available on other cores (if any) available in the BCM2835.
There is broad compiler support including gcc - please see ARM Compilers
The GPU provides APIs for Open GL ES 2.0, hardware-accelerated OpenVG, and 1080p30 H.264 high-profile decode.
The GPU is capable of 1Gpixel/s, 1.5Gtexel/s or 24 GFLOPs of general purpose compute and features a bunch of texture filtering and DMA infrastructure - the Raspberry Pi team are looking at how they can make this available to application programmers.
The GPU blob is an 18MB as an elf file, plus libraries. It does an awful lot. 
There is a DSP, but there isn't currently a public API (Liz thinks the BC team are keen to make one available at some point).
From Eben: "We'll have to take a look. We support hardware-accelerated OpenVG, and have had Flash Lite running incredibly fast. Personally, I'd like to get the official hardware-accelerated Flash 10 going on there, running against OpenGL ES 2.0, but that's something to think about after the launch."
This section collects hints, tips & tricks for various software components.
News articles and blog posts about Raspberry Pi
- http://www.guardian.co.uk/technology/2011/aug/28/ict-changes-needed-national-curriculum?CMP=twt_gu - RaspberryPi background and interview with Eben. (Aug 28 2011)
- http://journaltec.com/2011/08/04/raspberry-pi-interview-with-eben-upton.html - Email interview with Eben. (Aug 4 2011)
- http://www.next-gen.biz/features/david-braben-raspberry-pi - David talks pi and computer education in the UK. (Aug 3 2011)
- http://www.cabume.co.uk/hardware/cambridges-fifteen-quid-computer-set-for-q4-launch.html - Cambridge Business Media is chuffed that, among other things, we're based in Cambridge. (3 Aug 2011)
- http://amplecan.com/archives/762 - Blog post from TheSynapseUK, who posts on the Raspberry Pi boards. This is particularly good on some of the stumbling blocks we have to overcome in schools beyond the curriculum, like all those ICT teachers who don't have any programming experience. (2 Aug 2011)
- http://www.exanders.fr/raspberry-pi-lordinateur-a-17-euros-en-bonne-voie-de-concretisation/ - French article on the how far we've come on the project. (1 Aug 2011)
- http://www.pvsm.ru/article/63919 - Russian article about the Raspi. I am charmed to discover that Google Translate says the English for the Russian version of Braben is Brabo. I think we should adopt Brabo as David's superhero name. (31 July 2011)
- http://orvtech.com/general/raspberry-pi-servidor-casero-alpha/ - Piece in Spanish about the project and the board going alpha. Note shiny US quarter photoshopped over the official 20p piece photo! (30 July 2011)
- http://www.greentablet.info/gadget-25-raspberry-minicomputer-now-in-alpha-production-stage.html - Another short news piece about the board going alpha. (30 July 2011)
- Slashdot: Raspberry Pi $25 PC Goes Into Alpha Production (29 July 2011)
- Geek.com: Raspberry Pi $25 PC goes into alpha production (28 July 2011)
- HuffPost UK: Why Doesn't The UK Have Its Own Apple Inc? - article on the state of the UK computer industry, which interviews Eben and includes some uplifting material on Raspi. (28 July 2011)
- Christian Science Monitor: Raspberry Pi: Rise of the $25 computer - David talks to the Christian Science Monitor about the educational implications of the project. (12 July 2011)
- http://micromath.wordpress.com/2011/06/04/digital-illiteracy-and-raspberry-pi/ - Mathematics under the Microscope, a great maths teaching blog, on Raspi. There's an interesting follow-up post too - and if you have an interest in education, especially in the sciences, the whole blog is well worth your time. (4 June 2011)
- http://www.linuxjournal.com/content/raspberry-pi-tiny-computer-runs-linux - Linux Journal is, perhaps not surprisingly, very pleased that the Raspi will be running Linux. (31 May 2011)
- http://www.electronicsweekly.com/Articles/2011/05/26/51140/in-depth-raspberry-pi-the-computer-on-a-stick.htm - EW interviews Eben. (26 May 2011)
- Computer World UK: As British as Raspberry Pi? (9 May 2011)
- http://www.theinquirer.net/inquirer/news/2068735/uk-developer-creates-gbp15-kids - The Inquirer chats to David. (6 May 2011)
- http://www.techeye.net/hardware/15-usb-pc-creator-david-braben-in-talks-with-government - TechEye talks to David (who talks a bit about his impressions of ICT teaching in the UK as well as about the device). (6 May 2011)
- ARMDevices.net: $25 ARM Powered Desktop presented by Raspberry Pi Foundation (6 May 2011)
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- BBC iClick's Peter Price asks whether a £15 computer can solve the programming gap (6 minutes, 3 June 2011)
- Raspberry Pi's David Braben talks to BBC's Rory Cellan-Jones (2:28 minutes, 5 May 2011)
- Raspberry Pi community tutorials on YouTube
- Podcast of a phone interview with Eben about the project and the motivations behind it (15 minutes long.) (3 June 2011) Transcription here.
- Pre-production board (beta board) PCB, topside
- Pre-production board (beta board) PCB, underside
- Pre-production board vs credit-card
- Alpha prototype board, topside - Alpha prototypes are about 50% larger than the target credit-card size
- Alpha prototype board, underside
- Prototype1 board
See also Schematic / Layout
Raspberry Pi wiki pages
- The Undocumented Pi
- RPi USB booting
- RPi BCM2711 GPIOs
- Category:RPi Tutorials
- RPi BCM2837 Pinout
- Transfer system disk from SD card to hard disk
- Plan 9 on Raspberry Pi
- Adafruit 954 USB serial cable
- RPi VNC Desktop sharing
- Assign GPIO as ACT-led
- User:Dfarning/BeagleBone Hub
- RPi Upstream Kernel Compilation
- Installing RaPiRo Web Control
- DE:RPi Hub
- Template:Ja:Raspberry Pi
- RaspberryPi Comparison
- RPi cmdline.txt
- RPi Expansion Boards by Manufacturer
- File:RPI extension board- Slice of Pi.JPG
- RPi Expansion Boards: Pridopia
- File:RPi Servo board.jpg
- File:Raspberry pi- EASY GPIO.jpg
- RPi Powered USB Hubs
- RPi USB Keyboards
- RPi USB Webcams
- RPi USB Mouse devices
- RPi 拓展板
- RPi 底层外设
- RPi 屏幕
- RPi 硬件
- RPi 简易 GPIO 硬件 & 软件教程
- RPi 硬件历史
- RPi 简史
- RPi 认证外设
- Template:Zh-CN:Hub Flags
- R-Pi 故障排除
- RPi 新手指南
- Template:Zh-CN:Raspberry Pi
- RPi 硬件基础设置
- RPi 购买指南
- RPi 常见问题解答
- Zh-CN:RPi 信息中心
- Userspace Arduino:Libraries
- Userspace Arduino:To Do
- Zh-CN:RPi Hub
- Userspace Arduino
- RPi USB Ethernet adapters
- RPi USB Bluetooth adapters
- RPi SD cards
- RPi USB Wi-Fi Adapters
- FR:RPi Tutorial Easy GPIO Hardware & Software
- FR:RPi Ruby on Rails
- FR:RPi XRDP Server
- FR:RPi Install software
- FR:RPi Debian Python3
- FR:RPi Setting up a static IP in Debian
- FR:RPi BCM2835 Pinout
- FR:RPi BCM2835 Signals Rev2.0
- FR:RPi BCM2835 Signals Rev1.0
- FR:RPi Philosophy
- FR:RPi Defining Default Terminal Size
- FR:RPi Projects/Digital Signage
- FR:RPi VICE C64 Emulator
- FR:RPi Email IP On Boot Debian
- FR:Wheezy and the ssh client
- FR:R-Pi ConfigurationFile
- FR:RPi IceWeasel
- FR:RPi Java
- FR:RPi Debian Auto Login
- FR:RPi Chromium
- FR:RPi Documentation
- FR:Lazarus on RPi
- FR:RPi Easy SD Card Setup
- FR:Free Pascal on RPi
- FR:RPi Programming Books
- FR:RPi MySQL
- FR:Will RPi Run
- FR:RPi xray wallpapers
- FR:RPi Bugs
- FR:R-Pi Troubleshooting
- Histoire résumée de RPi
- FR:RPi General History
- Rpi Camera Module
- FR:RPi HTML5
- FR:Rpi Music Player Daemon
- FR:RPi emulators
- FR:RPi FAQ
- FR:RPi DatasheetCategories
- FR:RPi Shipping
- FR:Configuring a Static IP address on your Raspberry Pi
- FR:RPi End-user FAQ
- FR:RPi Perl
- FR:RPi Emulators
- RPi SPI
- FR:RPi List of Templates
- FR:RPi Guides
- FR:RPi Utilities
- FR:Raspberry Jam
- FR:RPi Games
- FR:RPi applications
- FR:TheMagPi Information for new volunteers
- Template:Pt-BR:Raspberry Pi
- Pt-BR:R-Pi Hub
- Wheezy and the ssh client
- RPi Utilities
- Go on RPi
- File:Proto armour page.png
- File:Proto armour pi page.png
- File:PiEm Foto2.jpg
- File:PiF Senso1.jpg
- File:PiF Relais2.jpg
- File:PiEm Foto1.jpg
- Free Pascal on RPi
- File:Free Pascal IDE on Raspberry Pi.png
- File:RPi P6 header.png
- File:RPi P5 header.png
- RPi Projects/PiFace controlling a slot-car
- File:RPi P3 header.png
- File:RPi P2 header.png
- File:RPi P1 header.png
- TheMagPi Information for new volunteers
- RPi Defining Default Terminal Size
- RPi Java JDK Installation
- RPi IceWeasel
- File:Raspberry Pi I-O viii.doc
- File:GPIO Driving Example (BASIC) .doc
- File:SD Card dimensions.png
- RPi Java
- RPi emulators
- File:RPI GPIO testprogram with lazarus.png
- RPi CANBus
- The Lone Raspberry Project
- Raspberry Joomla!
- Configuring a Static IP address on your Raspberry Pi
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raspberrypi.org (RaspberryPi home)
- Using Google you can search raspberrypi.org (including Forum) using site:raspberrypi.org <search term>. The home page and forum each have their own search facilitiy also.
Manuals and resources
Contact and communication
Education & Training materials
Main page: RaspberryPiBoard/EducationalLinks
Raspberry Pi plans to support Python and C as primary teaching languages, but expect to have some sort of BASIC on there too. Perhaps even BBC BASIC or SuperBASIC depending on copyright issues.
Programming languages, IDEs, etc
Languages tested on Alpha board
- Python 
- Ruby 1.9.2 (KidsRuby)
Expected to work
- (maybe) BoaConstructor
- Anjuta for C/C++
- BBC BASIC
- Small Basic
- Squeak implementation of Smalltalk
- Other BASIC variants common to Debian/Ubuntu/Fedora etc. are all likely to work fine, including:
See also: RaspberryPiBoard/EducationalLinks for education-friendly languages.
- Gambas - possibly a good choice; easy like old visual basic
- Android App Inventor
- Star Logo
- PrimerLabs CodeHero
- Sugar Learning Platform: An alternative to the Desktop metaphor of the GUI
See also Category:Education
Products are RoHS and CE compliant. Please contact Raspberry Pi for details regarding WEEE in your country.
Raspberry Pi will ship worldwide to the best of their ability (ie subject to UK export and local import laws).
Countries that may block the import due to their local laws include China (products imported or re-imported into China require a CCC certificate). This author is unaware if development boards such as the Raspberry Pi require a CCC certificate.
Countries that are currently subject to UK (including EU and UN) export restrictions include North Korea, Iran, Ivory Coast, Liberia and Zimbabwe. A full list and further details are provided at http://www.businesslink.gov.uk/bdotg/action/layer?topicId=1084100244
Raspberry Pi devices will ship from the UK (and possibly US) and Raspberry Pi will be looking to sign up distribution partners in due course.
To have an idea of shipping cost why don't you look at the Royal Mail website: http://sg.royalmail.com/portal/rm/PriceFinder?catId=23500532&gear=pricingcalc&campaignid=pricefinder_redirect
Look for a package just bigger then 85mm x 55mm x 30mm, weight about 55 grams.
As an example: New Zealand, small package 100grams, air mail 5 days : £2.05
- The layout for this page is based on the excellent BeagleBoard page on this site.
- Some of the text on this page has been adapted from contributions made by the contributors to the BeagleBoard page on this site.
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- Final PCB artwork