Select File > New Sketch from the Arduino IDE menus.In this case, the upload is expected to fail, but it would fail with a " not in sync" error instead of " Access is denied". The fault can be reproduced even if the FT232R-based device is not an Arduino board. The classic Arduino Nano is a common board that uses this chip.įT232R modules ( example) or cables ( example) are also often used to upload to boards such as the Arduino Pro Mini that don't have an integrated USB chip. To reproduce EquipmentĪ board or other device that has an FTDI FT232R USB chip System wide configuration file is "C:\Users\macie\AppData\Local\Arduino15\packages\arduino\tools\avrdude\6.3.0-arduino17/etc/nf"Īvrdude: ser_open(): can't open device "\\.\COM5": Access is denied.īut I can see logs from the serial monitor in Arduino IDE -> serial monitor. Now I've tried it on Windows 11, and most of the time, it gives me this error: I've been using Arduino IDE 2.0.3 with Nano without issues when uploading on Ubuntu. Serial Monitor or Serial Plotter is open.Arduino IDE is running on a Windows machine.? The upload fails with an " Access is denied" error under the following conditions: This means no special action is needed from the user to upload while Serial Monitor/Plotter is open. Arduino IDE handles this potential conflict of port usage automagically by closing the port in Serial Monitor/Plotter when an upload process is triggered, then opening it again after the upload is finished. This is not possible if another process already has control of the port.Īrduino IDE's "Serial Monitor" and and "Serial Plotter" components also use the serial port of the board. In order to upload to an Arduino board via a serial port, the upload tool (e.g., AVRDUDE) must be able to open the port.
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