arduino上传错误，avrdude: ser_open(): can't open device "\\.\COM3": 系统找不到指定的文件。的问题
打开设备管理器，点击端口，看到 并选择 Arduino Uno (com3)，然后右键选择属性，点击端口设置选项卡，点击高级，在左下角修改com端口号，然后重新拔插USB，在IDE重新设置com端口即可
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- 1. p1：aduino上传报错：avrdude: ser_open(): can't open device "\\.\COM3":系统找不到指定的文件
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