I have been busy lately with the renovation of my home. The floor isolation is applied and the floor heating tubes and the upper cement layer is also applied in my home. The electrical connections are plenty and I still have to complete many connections (all connected to a central point in my house)

But now I have also worked on my project. I have made a first draft to show you my ideas. Any requests and/or comments are more than welcome. Now is the time, because I will make a PCB on a short notice. I still have to connect the I2C buses and the SPI bus (of the ENC28J60) to the main controller. As a hardware engineer I know how to connect the sercoms, but maybe you can give me some advise which pins to use from a software perspective (easy Arduino implementation). Or does it not matter which sercoms/pins I will use?

I have also added an I2C LCD to the project. This makes it easier to debug the device and see what is going on with the IO's. Please notice the costs of the components that I use. It will be a very cheap solution (as promised ;) ). LCD is $2.40. ESP-12F is $1.63. The ENC28J60 board is $2.16.