Location of connectors and main ICs on Raspberry Pi 2 model B

Raspberry Pi 2 Model B

Raspberry Pi 2 Model B Specification:

Compared to the Raspberry Pi 1 it has:

• A 900MHz quad-core ARM Cortex-A7 CPU
• 1GB RAM

Like the (Pi 1) Model B+, it also has:

• 4 USB ports
• 40 GPIO pins
• Full HDMI port
• Ethernet port
• Combined 3.5mm audio jack and composite video
• Camera interface (CSI)
• Display interface (DSI)
• Micro SD card slot
• VideoCore IV 3D graphics core

Raspberry Pi 1 Model B+

Raspberry Pi 1 Model B+ Specification:

Compared to the Model B it has,
                        

• More GPIO
• More USB (4 USB 2.0 ports)
• Micro SD
• Lower power consumption
• Better audio
• Neater form factor

Raspberry Pi 1 Model B

Raspberry Pi 1 Model B Specification:

• Powered by Broadcom BCM2835, 700MHz ARM11 Processor
• 512MB SDRAM
• 2x USB2.0
• 1x 10/100 Ethernet
• Video Input for Camera Module
• Video output – composite, HDMI
• Audio output – 3.5mm jack, HDMI, IIS audio
• 8x GPIO, UART, IIC, SPI Bus
• Storage – SD/MMC / SDIO Card slot
• Power: 5V via MicroUSB ; 700mA (3.5W)
• Weight: 45g
• Size: 85.60mm x 53.98mm
• Operating system: Arch Linux ARM , Raspbian, Debian, Pidora, RISC OS….

Raspberry Pi 1 Model A+

Raspberry Pi Model A+ Specification:

Compared to the Model A it has, 

• More GPIO
• Micro SD
• Lower power consumption
• Better audio
• Smaller, neater form factor

Raspberry Pi Model A

 

Raspberry Pi Model A Specification:

• Full size SD card
• HDMI output port
• Composite video output
• One USB port
• 26 pin expansion header exposing GPIO, I2C etc
• 3.5mm audio jack
• Camera interface port (CSI-2)
• LCD display interface port (DSI)
• One microUSB power connector for powering the device
• 256MB of SDRAM  
• no Ethernet port

Introduction to Raspberry Pi?

• The Raspberry Pi is a low cost, credit-card sized computer that plugs into a computer monitor or TV, and uses a standard keyboard and mouse. 
• It is a little device that enables to explore computing, and to learn how to program in languages like Scratch and Python. 
• It’s capable to do browsing the internet and playing high-definition video, to making spreadsheets, word-processing, and playing games. 
•  The Raspberry pi has been used by students, hobbyist, technical professional as a starter kit to develop applications and control function around it. 
• It is also being used in industrial control and as a central processing units which integrate and control the overall system. 
• Raspberry Pi is essentially a bare-bones personal computer with a Linux operating system installed.
• These are the current models of the Raspberry Pi available: the Pi 2 Model B, and the Pi 1 Model B+ and A+.