The part you can build @home !
This repository contains the home system (composed by an Arduino and a Raspberry Pi inter-connected).
The Arduino fetches some data from its environment, and send them to the Raspberry through a serial communication (USB in this case).
The Raspberry may afterwards push these data on a web-server with cron and rsync.
On the Arduino board, we used these libraries for each respective module :
On the Raspberry runs a Python script, and you'll need the Serial library (pip3 install pyserial).