This design uses 121 LEDs, arranged in a multi-layered ring shape. In terms of circuit principle, it is a 15 8+1 lattice, using three 74HC595s for cascading. The shape of the PCB is the shape of a mooncake.
121=11 11. I thought it could be converted into an ordinary rectangular dot matrix for display, but after testing, I found that the effect was not good because the circular angle is too large and the arc is large, so Chinese characters may not be displayed. The circle is just the shape of some small emoticons, which may be used to display emoticons later. Lighting effect video: https://www.bilibili.com/video/BV1WP4y1Y7pJ
PCB introduction video link: https://www.bilibili.com/video/BV1V34y1Q7pN
The code is in the attachment. There is no explanation video yet.
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