CoPiino is a Raspberry Pi HAT that stacks perfectly on Raspberry Pi Models A/B/B+/2 and is equiped with an AVR microcontroller which behaves like Arduino.
CoPiino is designed to cooperate with Raspberry Pi and interfaces to your Arduino shields. This symbiosis combines the connectivity of the Pi and the realtime performance of the CoProcessor.
AVR ATmega @ 16MHz, 128kb flash, 16kb ram, 4k eeprom
Standard Arduino functions (GPIO, PWM, I2C, SPI, RS232)
Power supply 5VDC / 1Amp for CoPiino and Raspberry Pi
All Pin headers compatible to Arduino UNO
ISP Flash programming through Raspberry Pi via free Web IDE
Direct connection to Raspberry Pi (SPI, RS232)