Tokyo Tech High School of Science and Technology has been developing the curriculum of robot education. "Electronics Control Practice" using a single-board microcomputer "Arduino" is studied in a second grader's lesson. This single-board microcomputer can treat a digital input/output and an analog input/output easily, and can study motor control and liquid crystal display. "Arduino" is also used in robot research in a third grader's lesson "Project Study", such as remote control of robot arm by using master slave system and development of a transformation robot which can run three wheels and walk on two legs. This paper describes these educational practices using "Arduino"