Raspberry Pi A + / B + / 2 adapter generation B turn Ard uino board with a variety of important resources.
Arduino is a huge ecosystem, if Pi interface can be converted to a standard Ard uino, it will be able to access a variety of Ard uino expansion board, access Ard uino ecosystem, more available resources.
Compatible with Ard uino UNO, Leonardo, easy access to a variety of Ard uino expansion board
XBee-board interface for easy access to a variety of XBee modules
Onboard USB TO UART, serial facilitate debugging, can also be configured as XBee USB Adapter
Onboard sensor interface, easy access to a variety of sensors
Onboard ADC, 10 bit, 38KSPS, 11 channels (6 channels for Ard uino interface, 5 channel for accessing sensor)
Onboard RTC, which is one of the most commonly used functions