First design

Tinkercad model

Video for grade 1s

https://isbdragons-my.sharepoint.com/:f:/g/personal/jun_lee_student_isb_bj_edu_cn/EuACNzXNPCdIuIJ3mJb57C8Bd7esiAtR2JazN9BsOikc9w?e=GwImXC

Arduino code