为了节约成本，四个LED共用一个IO，它们只能一起亮或灭，构成一个角，五个角只需要5个IO驱动。再加一个切换按键，一共需要六个IO。单片机选用的是STC8G1K08A，8脚贴片封装，正好六个IO，一个也不浪费，达到了成本更低花样更多的目的。
这个电路一共设计了两个版本，软件完全通用，只有硬件区别。第一版是没有电池的，需要连接电源才能使用；第二版增加了TP4059充电电路以及充电指示灯和一个电源开关，可以脱离电源使用。两版各有优缺点，没有电池更安全，但是不方便；有电池虽然方便了，但是安全性会降低。
关于功能，接上电源默认是常亮，每短按一次切换一个模式，一共六个模式循环切换，并且按键支持连击。
目前只写了这么多花样，其实能做的还有很多。比如说抽奖灯，随机停在一个角，指到什么就中了什么；再比如说骰子，虽然只有五个角，但是可以用五角闪烁来表示六。
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