メモ。なんでこんなに安いんだろう？ ・Fusion PCB Service http://www.seeedstudio.com/depot/fusion-pcb-service-p-835.html ・DFRobot http://www.dfrobot.com/index.php?route=product/product&path=135_134&product_id=717#.UR8i7GeVCig