Is it possible to use an ethernet cable as a pack of "conventional" wires?

[fergam]

Hello! I am creating a project that will envolve I²C protocol which, in a nutshell, a central turns on and off street lights while people or vehicles pass through a module. Is there a way to do a master/slave connection using an ethernet cable without having to create a private network between two microcontrollers?

[J-M-L]

The copper wires inside your Ethernet cables can be used just like you would use DuPont wires. You will have similar I2C challenges regarding distance as well.

[fergam]

And there is a way to use a module like this (at least for what I want to do)?

[J-M-L]

If you use such module (basically an ENC28J60 ) you create an Ethernet network. You need another one and another arduino on the other end.

[Hutkikz]

You haven't told us what it is you want to do.
Below is a schematic of that board. So no that will not "act like a pack of conventional wires".

[fergam]

Good point.
Could I do it with an ethernet breakout like this?

[Hutkikz]

would need to see a schematic but it appears to be a possibility.

[J-M-L]

You could just cut the Ethernet RJ45 plug and solder a couple pairs of wires

[apf1979]

I do that quite frequently. Easiest way to keep 8 different color cables of a decent gauge on hand.