I believe that you’ve got the raspberry pi 3/2B you want. At now you need to prepare a expansion board for your pi. DVK512 is a good choice, it integrates various components and interfaces for connecting external accessory boards. It's ideal for Raspberry Pi evaluation and development. Here is functional structure chart:

• 1, Pinheaders for connecting with the RPi
  
• 2, UART interface: easily connects to UART modules such as RS232, RS485, USB TO UART, etc.
  
• 3, 8I/Os interface: easily connects to modules controlled by I/Os, such as 8 Push Buttons, Logic Level Converter, Mix Board, etc.
  
• 4, SPI interface: easily connects to SPI modules such as AT45DBXX Dataflash, L3G4200D Board, etc.
  
• 5, I2C interface: easily connects to I2C modules such as PCF8574 Expansion Board, PCF8563 RTC Board, LSM303DLHC Board, etc.
  
• 6, Character LCD interface: for connecting character LCDs like LCD1602
  
• 7, USB connector: USB TO UART, supported by onboard converter CP2102
  
• 8, Power indicator
  
• 9, User LEDs
  
• 10, User Keys
  
• 11, Potentiometer: for LCD1602 contrast adjustment
  
• 12, RTC battery holder
  
• 13, PCF8563: onboard RTC chip
  
• 14, 32.768K crystal: RTC crystal
  
• 15, CP2102: onboard USB TO UART chip, for debugging
  
• 16, CP2102 jumper
  
• 17, RTC jumper
  
• 18, User LEDs jumper
  
• 19, User Keys jumper
  

Features

• Onboard USB TO UART, serial facilitate debugging
  
• Onboard four buttons and four led
  
• Onboard RTC
  
• Onboard LCD1602 Interface
  
• Onboard UART ,SPI, I2C, eight I / O
  
• Support Raspberry Pi 1 model A+
  
• Support Raspberry Pi 1 model B+
  
• Support Raspberry Pi 2 model B
  
• Support Raspberry Pi 3
  

Package list

• DVD X 1
  
• GPIO Expansion Board for Raspberry Pi B+/2B/3 x 1
  
• USB line x 1
  
• 4 pin jumper wire x 2
  
• 2 pin jumper wire x 2
  

• UserManual
  
• Schematic
  
• Code
  
• Panasonic_SDFormatter
  
• Win32DiskImager
  
• Putty
  
• RPi_software