I've been trying to upload a code to the microcontroller and it's not going in. The first issue encountered is the IDE cannot detect the ports. I've tried fixing the port issue by installing the usb serial driver. I've resolve it by downloading a driver thru this website: USB Serial Port Drivers Download for Windows 10, 8.1, 7, Vista, XP however the next issues is this.
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Hi @rich29. This "access is denied" error can occur when the port is open in another application. Only one application can have a serial port open at a time so Arduino IDE can't perform an upload under these conditions.
Check to see whether you have any applications running on your computer that might use the port. If they are, close them and then try the upload again.
If the upload still fails with the same error after that, try restarting your computer. In rare occasions, a glitch causes the port to get stuck open. This is one possible cause of the error. Restarting your computer restores the port to the normal working state and so fixes that particular cause of the error.
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