Author created a cigar humidor with a social life. A humidor stores cigars in a humidity controlled environment to maintain freshness, but this special humidor sends the humidity sensor value to ThingSpeak and alerts Twitter when you need to add water.
The project uses a humidity sensor and an Arduino Ethernet to post the data to the ThingSpeak API.
You can get more detail from below link.
(It was written in spanish.)
Source : http://cava.cuadratic.com/