Raspberry Pi is a powerful small computer, but it is not as Arduino, with a wealth of expansion boards, sensors, driver board and other hardware peripheral.
Raspberry Pi not like, Arduino as superposition of various expansion boards.
As the use of Arduino Leonardo Arduino Raspberry Pi device driver intermediary, the use of serial communication between them.

• Raspberry Pi as a powerful PC that can handle complex calculations, to make up the short board Arduino.
• Players have the Raspberry Pi based on Arduino easy to get started, basically there is no threshold.
• Powerful raspberry pie network and image processing functions for Arduino provides a low-cost networking and imaging solutions.
• With raspberry pie with leonardo, compared to Galileo or Arduino Yun purchase more affordable, lower learning costs.
• Integrated Arduino Leonardo, Raspberry Pi can also be programmed to also communicate.

Raspberry Pi as a powerful PC that can handle complex calculations, to make up the short board Arduino.Haweier