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###### 配置树莓派，
[树莓派存储空间不足 SD卡没有充分利用_newconniukang的博客-CSDN博客_树莓派16g的内存卡不够用 ](https://blog.csdn.net/newconniukang/article/details/103221414 )
##### 点灯
《树莓派项目实战》第一节 点亮LED灯_la_vie_est_belle的博客-CSDN博客_树莓派 灯 ](https://pyqt5.blog.csdn.net/article/details/113822675 )
.
##### 串口测试
树莓派 | 串口03 - Windows使用串口助手发送字符给树莓派_Wallace Zhang的博客-CSDN博客_树莓派串口调试助手 ](https://blog.csdn.net/wallace89/article/details/120582256 )
##### Python调用串口
[最简单的树莓派+python3+串口通信的教程以及出现的问题的解决方式_ChuckieZhu的博客-CSDN博客_树莓派串口通信python ](https://blog.csdn.net/qq_38431572/article/details/86488688 )
##### 设计协议
用一个字符（ * ）作为帧开始和结束标志
实现加减乘除功能
##### 实现