RasPiComm I/O Add-On Board for Raspberry Pi, Amescon
The RasPiComm from Amescon is a nifty little add-on board that easily plugs onto your Pi GPIO header. Once plugged onto your Pi, the RasPiComm opens up a whole series of communication possibilities that can add extra features to your Pi projects and designs.
What can I do with the RasPiComm? Take better control of the Pi using a 5-way joystick Control stepper motors using the RS-485 serial communication port Communicate with your computer or a modem using the RS-232 serial communications port Connect to a display or sensors through the I²C serial interface Access a real-time clock that never 'powers off'