I am running Arduino IDE v2.3.4 on a Windows 11 desktop PC. With a trivial program my PC processor load is running at 30% just on the serial-monitor.exe and virtually no data communication going on. I don't know if this has been going on for a long time, or even if it has been going on forever. My PC has a variable speed cooling fan that ramps up when it's working hard, and the sound of that has alerted me to this "problem". Sorry - I really haven't been paying attention to whether this is normal. I do hope not. I have a screen dump that shows my Task Manager screen along with the program that's running in my Arduino - a straightforward vanilla Arduino nano.
Hi @rtdgreg. Please tell us which USB to serial bridge chip your Nano board has. This is the largest black chip on the bottom of the board.
The chip will usually be identified by writing on the top. This might say something like "WCH CH340G" or "FTDI FT232RL".
Examples:
WCH CH340
There are some boards on the market that have a USB chip with the same IC package as the WCH CH340, and which are identified by the computer as a CH340. However, these chips don't have the "WCH CH340C ..." labeling like you see on the chip in the picture above:
These mysterious unlabeled chips have different characteristics than the labeled CH340 chips, so please let us know if yours is labeled or not.
FTDI FT232R
If it isn't clear, alternatively you can provide the link to where you bought the board from and we'll see if we can determine the chip from the product listing.
The one exhibiting this problem is marked WCH CH340G - just like your first example. To be honest, I haven't been paying any attention to this. I have a bunch of different Arduinos, all with the same pinout as the basic nano. Where I run out of ram I move to the every. I'm kicking myself because I haven't been paying attention to the PC fan working overtime, and should have done so. I've actually got lots of these little Arduinos; probably from multiple sources that I won't be able to trace back.
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