Overview
Arduino is a massive ecosystem, if there's a way for the Raspberry Pi GPIO interface to adapt to Arduino pinouts, it is possible to use the Pi together with vast Arduino shields and hardware/software resources. The ARPI600 is just intended for this.
What's more, the ARPI600 also support XBee modules, make it easy to add wireless feature to your great project.

Supported Pi
Raspberry Pi 1 Model A+
Raspberry Pi 1 Model B+
Raspberry Pi 2 Model B
Raspberry Pi 3 Model B

ARPI600 Features
Compatible with Arduino UNO, Leonardo, easy to connect with various Arduino shields
XBee connector for connecting various XBee modules
Sensor interface for connecting various sensors
Onboard USB TO UART for serial port debugging, also can be configured as XBee USB adapter
Onboard ADC, 10 bit, 38KSPS, 11 channels (6 channels for Arduino interface, 5 channels for sensors)
Onboard RTC

Package Contains
1x ARPI600
1x USB type A plug to mini-B plug cable
1x RPi screws pack (2pcs)

• Support Raspberry Pi A+ / Pi B+ / Pi 2 Model B/ Pi 3 Model B
• Compatible with Arduino UNO, Leonardo, easy to connect with various Arduino shields
• ARPI600 also support XBee modules, make it easy to add wireless feature to your great project.
• Onboard USB TO UART for serial port debugging, also can be configured as XBee USB adapter
• Onboard ADC, 10 bit, 38KSPS, 11 channels (6 channels for Arduino interface, 5 channels for sensors)

Support Raspberry Pi A+ / Pi B+ / Pi 2 Model B/ Pi 3 Model BSainSmart