Olympichhh: 博主你好，请问340的tx输出高电平是3.3v还是5v是由340供电电压是3.3还是5v决定的吗

长的黝黑的小白: 如何安装machine库，他上级叫啥博主

小芒果_01: 你好，安装machine过程中出现下面这种问题怎么解决？ Building wheel for pycrypto (pyproject.toml) ... error error: subprocess-exited-with-error × Building wheel for pycrypto (pyproject.toml) did not run successfully. │ exit code: 1 ╰─> [2 lines of output] warning: GMP or MPIR library not found; Not building Crypto.PublicKey._fastmath. error: Microsoft Visual C++ 14.0 or greater is required. Get it with "Microsoft C++ Build Tools": https://visualstudio.microsoft.com/visual-cpp-build-tools/ [end of output] note: This error originates from a subprocess, and is likely not a problem with pip. ERROR: Failed building wheel for pycrypto Failed to build pycrypto ERROR: Could not build wheels for pycrypto, which is required to install pyproject.toml-based projects

fox_one777: 老哥,这样的U盘模式怎么弄的

lchrisl: 用key就可以了