Measure soil Moisture with Arduino – Gardening

LED Stair Lighting Hack with Raspberry Pi

LED Stair Lighting Hack with Raspberry Pi

Source: http://blog.hekkers.net/tag/staircase/

This interesting project shows how to light stair with Arduino and Raspberry while someone is climbing.
Robert Hekkers did a amazing work described via several steps on his blog

Measure Light with arduino and BH1750 module

Communicating from low power Arduino to Raspberry Pi via NRF24L01