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###### 配置树莓派，安装python、pip
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空间不足的解决方法
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[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)
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##### 点灯
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[《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)
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##### 串口测试
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[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)
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##### Python调用串口
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安装wiringpi查看RxD、TxD
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[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)
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##### 设计协议
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参照数据链路层
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用一个字符（ * ）作为帧开始和结束标志
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实现加减乘除功能
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##### 实现
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