This treasure is wrote in Spanish and includes the example of sending a Twitter using Arduino Ethernet.(anyone can use google translation for an understanding.)
Those are preparation for an implement.
- Arduino Board
- Ethernet Shield.
- Ethernet Cable.
- Twitter account.
It is structured in 3 steps which make everyone to follow without many difficulties. Although this is not really different from other Twitter usage examples so far, you can find lots of handy tutorials such as Arduino Yun.
You can get the source code and more details from below link.