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.
Raspberry Pi 1 Model A+
Raspberry Pi 1 Model B+
Raspberry Pi 2 Model B
Raspberry Pi 3 Model B
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)