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
1．Arduino connector : for connecting Arduino shields
2．ICSP interface : Arduino ICSP
3．XBee connector : for connecting XBee communication modules
4．Sensor interface : for connecting sensors
5．Raspberry Pi connector : for connecting Raspberry Pi
6．USB TO UART
7．TLC1543 : AD converter
8．PCF8563 : RTC
10．32.768KHz crystal : for RTC
12．XBee state LED
13．XBee and Arduino interface RESET button
14．XBee EASYLINK button
15．RTC battery holder : for CR1220 button battery
16．TLC1543 reference voltage configuration jumper
when connecting P_RX and CP_TX, P_TX and CP_RX respectively, USB TO UART is connected to Raspberry Pi serial port
when connecting XB_RX and CP_TX, XB_TX and CP_RX respectively, USB TO UART is connected to XBee serial port
when connecting XB_RX and P_TX, XB_TX and P_RX respectively, Raspberry Pi serial port is connected to XBee serial port
19．Arduino AD selection jumper
short 2 and 3 : Arduino A0-A5 as AD input
short 1 and 2 : Arduino A0-A5 as digital control
20．Arduino I2C selection jumper
short the jumper : Arduino A4-A5 as I2C control (the A4-A5 of Arduino AD selection jumper should be opened)
21．Arduino SPI selection jumper
short 1 and 2 : Arduino D11-D13 as SPI control (default)
short 2 and 3 : Arduino D11-D13 as digital control
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