IDE 2.1.0 Serial Monitor lost Baud selection and will not connect

[JohnRob]

My IDE lost the ability to use the serial monitor.

I'm using a simple program on an Arduino Pro Mini. Nothing is connected to the Arduino except the FTDI programmer.

After uploading, the program still has the "Uploading Indicator" with a blue underline moving continuously.

Version: 2.1.0
Date: 2023-04-19T15:31:10.185Z
CLI Version: 0.32.2
Windows 11/64 Pro

[ptillisch]

Hi @JohnRob

@JohnRob

After uploading, the program still has the "Uploading Indicator" with a blue underline moving continuously.

I think the problem with Serial Monitor is only a symptom of the IDE still being in this bad state from the hung upload.

Please try this:

1. Select File > Quit from the Arduino IDE menus.
2. Make sure all Arduino IDE windows closed (I'm not sure File > Quit is functional when the IDE is in this state).
3. Start Arduino IDE.
4. Select the board and port as usual.
5. Open Serial Monitor if it is not already open.

Does Serial Monitor work correctly after you restart the IDE per the instructions above?

[sterretje]

In my experience, the missing baudrate selection occurs because the serial monitor can't connect to the board. And that is clearly visible in your second screenshot that it can't connect.

There are known issues in IDE 2.x with regards to FTDI adapters. I think that "Access is denied" error when uploading to board w/ FT232 USB chip with Serial Monitor/Plotter open · Issue #1783 · arduino/arduino-ide · GitHub covers that.