星星灯，有几种变换模式，以89c52单片机为核心，漂亮。简单制作，送人特好。-Star light, there are several kinds of transformation patterns, with 89 c52 as the core, beautiful.Simple making, send people very good.

一种基于89C51单片机开发的一种带看门狗保护的电子跷跷板，防电子干扰，值得借鉴。。。。。。(Based on 89 c51 MCU development of a guard dog to protect electronic seesaw, preventing electronic interference, it is worth reference...)