Want to do more with your Arduino shields? The Gertduino is an Arduino and Arduino Uno compatible GPIO expansion board designed exclusively for the Raspberry Pi by Gert van Loo.
GertDuino offers onboard Atmega 328 shield hosting which will execute Atmega 328 code written and compiled on the Raspberry Pi. The onboard Atmega 48 provides RTC, IrDA front-end, and additional computational capability.
Also supplied with GertDuino are free to download software and tutorials.
Included on the GertDuino are: