I2c RaspberryPi2 Master to Arduino Slave

Use a Raspberry as Master for I2C Busand Arduino Uno as Slave (127 slaves capability)

Use a Raspberry as Master for I2C Bus
and Arduino Uno as Slave (127 slaves capability)

Follow this guide for Setup
https://blog.retep.org/2014/02/15/connecting-an-arduino-to-a-raspberry-pi-using-i2c/