![Can't open device "\\.\COM4": Access is denied error when uploading a sketch from Arduino IDE | I learned it. I share it. Can't open device "\\.\COM4": Access is denied error when uploading a sketch from Arduino IDE | I learned it. I share it.](https://gyorgybalassy.files.wordpress.com/2020/10/arduino-port-settings_thumb.png?w=364&h=455)
Can't open device "\\.\COM4": Access is denied error when uploading a sketch from Arduino IDE | I learned it. I share it.
![Can't open device "\\.\COM4": Access is denied error when uploading a sketch from Arduino IDE | I learned it. I share it. Can't open device "\\.\COM4": Access is denied error when uploading a sketch from Arduino IDE | I learned it. I share it.](https://gyorgybalassy.files.wordpress.com/2020/10/arduino-serial-port-in-device-manager.png)
Can't open device "\\.\COM4": Access is denied error when uploading a sketch from Arduino IDE | I learned it. I share it.
![Can't open device "\\.\COM4": Access is denied error when uploading a sketch from Arduino IDE | I learned it. I share it. Can't open device "\\.\COM4": Access is denied error when uploading a sketch from Arduino IDE | I learned it. I share it.](https://gyorgybalassy.files.wordpress.com/2020/10/arduino-port-properties.png)
Can't open device "\\.\COM4": Access is denied error when uploading a sketch from Arduino IDE | I learned it. I share it.
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Serial port about could not open port 'COM4(Arduino/Genuino Uno · Issue #90 · hamuchiwa/AutoRCCar · GitHub
![Error "Board at COM4 is not available" when I click on serial monitor. - Installation & Troubleshooting - Arduino Forum Error "Board at COM4 is not available" when I click on serial monitor. - Installation & Troubleshooting - Arduino Forum](https://europe1.discourse-cdn.com/arduino/original/4X/8/0/f/80f5ac4a803ca55201a600d9124522f02a1edeab.png)
Error "Board at COM4 is not available" when I click on serial monitor. - Installation & Troubleshooting - Arduino Forum
![python error:SerialException: could not open port 'COM6': PermissionError(13, '拒绝访问。', None, 5)_鹏鹏写代码的博客-CSDN博客 python error:SerialException: could not open port 'COM6': PermissionError(13, '拒绝访问。', None, 5)_鹏鹏写代码的博客-CSDN博客](https://img-blog.csdnimg.cn/20210119171421240.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ0MTc2MzQz,size_16,color_FFFFFF,t_70)