I made lots of researches in order to draw correct diagrams. Most of the challenges happened during the user testings. For example, the ultrasonic sensor may be affected by tiny things in front of it, so the housing needs to be perfectly made in case uncovering any part of the sensor. The light bulb needs to be carefully selected. During the first iteration, the light bulb was not large enough to see the changes, so I had to purchase another type and reinstall it. Besides, user wanted to switch songs by pressing the button arranged on the Christmas box. So I learned to code on connecting button for user needs.

只有经过大量研究，才能绘制正确的与coding相关的图表。此外，在用户测试期间同样遇到一些问题。例如，超声波传感器会受到其前面微小物体的影响，因此需要谨慎地制作housing包装，以防其他零件影响传感器的正常运作。其次，led灯在第一次迭代中，因灯体较小，无法看清操作过程中的亮度改变，因此我安置了另一种led灯，重新包装并完成实验。此外，用户想通过按下圣诞节盒上的按钮来切换歌曲。因此我根据用户需求学习关于连接按钮部分的编码。