Depending on what you're trying to achieve there are several ways to interface your BITalino with a Raspberry Pi or derived platforms.
Check out the hardware reference of each BITalino block, available under "General Description" at:
http://www.biosignalsplux.com/downloads ... anual.html
The BITalino MCU has the UART pins exposed, which you can connect to the UART interface on a Raspberry using for example our Python + pySerial API.
Another option is to preserve the Bluetooth connectivity, in which case you can adapt one of the existing APIs.
In either case, we recommend that you start by browsing through the APIs available for download at:
Note also that BITalino has its own MCU block, purpose-built to cope with the requirements of biosignals.