For this week i started off my making an I2C wired network. It's very efficient in terms of wiring (only two wires to support many slaves), and a bonus of this protocol is that there are supported libraries that work with Attiny.
There are quite a few previous makers that have used tinywires, and their websites were very useful for me this week - in particular
I installed libraries from this
This board uses the Attiny45, and therefore has very low pin counts. Some of the pins double up as both MOSI and clock lines and data lines - and therefore it is important to disconeect these signal pins when programming the board (see bellow).
One note here - Tinywires sends infomation in single bytes, and so I remapped the values from my potentiometer to 1-255.