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参照官方教程上的串口通讯，向arduino发送数据乱码怎么回事呀
是哪里乱码？是arduino显示的乱码？arduino的代码又是什么？怎么显示的？
请包括必要的步骤，和代码。
感谢，我以为arduino这边不需要代码，我现在添加了，可是mv这边发送hello，arduino显示104是什么意思呀
请提供可以运行的代码，步骤，和截图