1. https://ithelp.ithome.com.tw/articles/10272266

2.https://steam.oxxostudio.tw/category/microbit/example/countdown.html

3.https://steam.oxxostudio.tw/category/microbit/example/led-circle.html

4.作業上傳  https://drive.google.com/drive/folders/1gwA4iT8PJrU-a-sUjNZy3RUgQ8JaGMwT?usp=sharing