I have been working on a project for a couple of month now and are soon ready to send this to production. It is a I/O board with 4 relays, 8 digital inputs, 4 RS232 and 1 RS422/485. All inputs are ESD and EMI protected.
The main purpuse of this board is to make it easier for everyone to develope some homeautomationproducts with Arduino and Raspberry Pi.
Read more about the project at: http://www.expansionboard.org
Please notify me if you have some ideas of improvement :D