Raspberry pi
http://www.amazon.co.jp/Raspberry-%E3%83%9C%E3%83%BC%E3%83%89%EF%BC%86%E3%82%B1%E3%83%BC%E3%82%B9%E3%82%BB%E3%83%83%E3%83%88-%EF%BC%88Element14%E7%89%88-Computing-Lab/dp/B01CSFZ4JG/ref=sr_1_1?ie=UTF8&qid=1461245658&sr=8-1&keywords=raspberr…