I2C distance is normally a few meters (2 a 3), 400pF wire. WII-remote goes beyond this or use a driver P82B96DR (at Farnell for €4,-) to reach 50meters, 3000pF wire. For this extensions you need 15V bus-voltage.
http://cladlab.com/electronics/circuit-design/communication-protocols/i2c-protocol
Going cheap wireless is possible with this lc module:
http://dx.com/p/433mhz-rf-transmitter-module-receiver-module-link-kit-for-arduino-arm-mcu-wl-green-220194
Atmega328P has opration voltage from 1.8-5.5V. Possibility to use 5V over the bus, I guess..
http://cladlab.com/electronics/circuit-design/communication-protocols/i2c-protocol
http://dx.com/p/433mhz-rf-transmitter-module-receiver-module-link-kit-for-arduino-arm-mcu-wl-green-220194
Atmega328P has opration voltage from 1.8-5.5V. Possibility to use 5V over the bus, I guess..
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