Raspberry Pi
Template:Infobox computer The Raspberry Pi is a single-board computer developed in the UK by the Raspberry Pi Foundation. Public orders are scheduled to be accepted beginning February 2012 and the foundation plans to release two versions priced at USD $25 and $35 (GBP ~£16 and ~£22). It is intended to stimulate the teaching of basic computer science in schools.
The design is based around a Broadcom BCM2835 SoC, which includes an ARM1176JZF-S 700 MHz processor, VideoCore IV GPU, and 128 or 256 megabytes of RAM. The design does not include a built-in hard disk or solid-state drive, instead relying on an SD card for booting and long-term storage.
This board is intended to run Linux kernel based operating systems.
Features
The foundation plans to release two models at launch. Model A will have 128 MB RAM memory, one USB port and no Ethernet controller, and will cost US$25, while model B will contain 256 MB RAM memory, two USB ports and a 10/100 Ethernet controller and will cost US$35.
Though the Model A doesn't have an RJ45 Ethernet port, it can connect to a network by using a user supplied USB Ethernet or Wi-Fi adapter. As typical of modern computers, generic USB keyboards and mice are compatible with the Raspberry Pi.
The Raspberry Pi will use Linux-based operating systems. Debian GNU/Linux, Iceweasel, Calligra Suite and Python are planned to be bundled with the Raspberry Pi.
The Raspberry PI does not come with a real-time clock, so an OS must use a network time server, or ask the user for time information at boot time to get access to time and date info for file time and date stamping. However a real time clock (such as the DS1307) with battery backup can be easily added via the I2C interface.
Specifications
| Model A | Model B | |
|---|---|---|
| Target price: | USD $25 (GBP £16) | USD $35 (GBP £22) |
| SoC: | Broadcom BCM2835 (CPU + GPU + DSP + SDRAM) | |
| CPU: | 700 MHz ARM1176JZF-S core (ARM11 family) | |
| GPU: | Broadcom VideoCore IV, OpenGL ES 2.0, 1080p30 h.264/MPEG-4 AVC high-profile decode | |
| Memory (SDRAM): | 128 MB | 256 MB |
| USB 2.0 ports: | 1 | 2 (via integrated USB hub) |
| Video outputs: | Composite RCA, HDMI | |
| Audio outputs: | 3.5 mm jack, HDMI | |
| Onboard storage: | SD / MMC / SDIO card slot | |
| Onboard network: | None | 10/100 Ethernet |
| Low-level peripherals: | 8 x GPIO, UART, w:I²C bus, SPI bus with two chip selects, +3.3 V, +5 V, Ground (GPIO connector is not assembled on the board, see below for details) | |
| Power ratings: | 500 mA (2.5 W) | 700 mA (3.5 W) |
| Power source: | 5 volt via MicroUSB or optional GPIO header | |
| Size: | 85.60 × 53.98 mm (3.370 × 2.125 in) | |
| Supported operating systems: | Debian GNU/Linux, Fedora, Arch Linux | |
- Notes
- Model A and Model B are cultural references to the original models of the British educational BBC Micro computer, developed by Acorn Computers who originally developed the ARM processors (the architecture of the Raspberry Pi) and operating system RISC OS which will be able to be run on it.
- The 26-pin GPIO connector is not assembled on the board. The end-user must purchase and solder a 13x2 pin header with 0.1-inch (2.54mm) spacing. The pin header can be either a straight pin header, mounted on either the bottom or the top, (to connect to a "daughterboard") or it can be a right-angle shrouded box connector for use with a ribbon cable.
- At the moment RISC OS (shared source) is not yet supported, as it lacks essential drivers.