Raspberry pi




 * The Raspberry Pi is a credit card-sized single-board ultra-low-cost ($35) Linux computer which was developed by the Raspberry Pi Foundation with the intention of promoting the teaching of basic computer science in schools
 * The Raspberry Pi has a Broadcom BCM2835 system on a chip (SoC), which includes an ARM1176JZF-S 700 MHz processor, VideoCore IV GPU, and was originally shipped with 256 megabytes of RAM, later upgraded (Model B & Model B+) to 512 MB.
 * It does not include a built-in hard disk or solid-state drive, but it uses an SD card for booting and persistent storage, with the Model B+ using a MicroSD.
 * The Foundation provides Debian and Arch Linux ARM distributions for download.
 * Tools are available for Python as the main programming language, with support for BBC BASIC (via the RISC OS image or the Brandy Basic clone for Linux), C, Java, Perl and Ruby.
 * As of February 2014, about 2.5 million boards had been sold.

=Specifications=

=GPIO Reference (WiringPi)= pi@raspberrypi ~ $ gpio readall +-+-+-+--+---+--B Plus--+---+--+-+-+-+ | BCM | wPi |  Name  | Mode | V | Physical | V | Mode | Name    | wPi | BCM | +-+-+-+--+---++++---+--+-+-+-+ |    |     |    3.3v |      |   |  1 || 2  |   |      | 5v      |     |     | |  2 |   8 |   SDA.1 |   IN | 1 |  3 || 4  |   |      | 5V      |     |     | |  3 |   9 |   SCL.1 |   IN | 1 |  5 || 6  |   |      | 0v      |     |     | |  4 |   7 | GPIO. 7 |  IN | 1 |  7 || 8  | 1 | ALT0 | TxD     | 15  | 14  | |    |     |      0v |      |   |  9 || 10 | 1 | ALT0 | RxD     | 16  | 15  | | 17 |   0 | GPIO. 0 |  IN | 0 | 11 || 12 | 0 | IN   | GPIO. 1 | 1  | 18  | |  27 |   2 | GPIO. 2 |  IN | 0 | 13 || 14 |   |      | 0v      |     |     | | 22 |   3 | GPIO. 3 |  IN | 0 | 15 || 16 | 0 | IN   | GPIO. 4 | 4  | 23  | |     |     |    3.3v |      |   | 17 || 18 | 0 | IN   | GPIO. 5 | 5  | 24  | |  10 |  12 |    MOSI |   IN | 0 | 19 || 20 |   |      | 0v      |     |     | |  9 |  13 |    MISO |   IN | 0 | 21 || 22 | 0 | IN   | GPIO. 6 | 6  | 25  | |  11 |  14 |    SCLK |   IN | 0 | 23 || 24 | 1 | IN   | CE0     | 10  | 8   | |    |     |      0v |      |   | 25 || 26 | 1 | IN   | CE1     | 11  | 7   | |  0 |  30 |   SDA.0 |   IN | 1 | 27 || 28 | 1 | IN   | SCL.0   | 31  | 1   | |  5 |  21 | GPIO.21 |   IN | 1 | 29 || 30 |   |      | 0v      |     |     | |  6 |  22 | GPIO.22 |   IN | 1 | 31 || 32 | 0 | IN   | GPIO.26 | 26  | 12  | | 13 |  23 | GPIO.23 |   IN | 0 | 33 || 34 |   |      | 0v      |     |     | | 19 |  24 | GPIO.24 |   IN | 0 | 35 || 36 | 0 | IN   | GPIO.27 | 27  | 16  | | 26 |  25 | GPIO.25 |   IN | 0 | 37 || 38 | 0 | IN   | GPIO.28 | 28  | 20  | |    |     |      0v |      |   | 39 || 40 | 0 | IN   | GPIO.29 | 29  | 21  | +-+-+-+--+---++++---+--+-+-+-+ | BCM | wPi |  Name  | Mode | V | Physical | V | Mode | Name    | wPi | BCM | +-+-+-+--+---+--B Plus--+---+--+-+-+-+