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Author Topic: Serial Monitor odd behavior  (Read 150 times)
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Tacoma, Washington, USA
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Arduino UNO R3.  When I first connect to my laptop with a USB cable I get a sound and the Device Manager window shows Ports(COM & LPT)-USB Serial (Communication Class, Abstract Control Model) (COM5).  The IDE Tools window show COM3 and COM5 are available and COM5 is checked.  If I unplug the USB and reconnect it to reboot the UNO (the UNO is imbedded in my application and I can't reach the Reset button) I get the sound and the Device Manager window shows the same as above but only COM3 is available, hence, I can't use the Serial Monitor.  Several tries don't help.  If I leave it unplugged for a while it works.  What am I doing wrong?

Bob Weber
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What am I doing wrong?
The only thing I can see that you are doing wrong is this:
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the UNO is imbedded in my application and I can't reach the Reset button

The reset button can be brought to the surface of the enclosure quite easily.

Although, I suspect that that won't help.

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I can't use the Serial Monitor.
What does the IDE show?
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