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Southampton UK
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I have a problem communicating between my Toshiba laptop and my Arduino Uno, and any help would be much appreciated by a newbie.

In case it's relevant, the laptop is an old 7140 Portege with a single USB port.  The port is low speed (9600).

When I installed the Arduino IDE the Uno came up on port Com4.  Everything seemed ok, and I was able to upload sketches and run them.  The problem came when I tried to use serial comms from the Uno back to the PC.  This works, but it seems to tie up the serial bus, so that when I try to upload a new sketch I get an error message saying Com4 is already in use.  When I look at "Ports" in the Tools menu, Com4 no longer shows, and the only way I can regain control is to switch everything off and start again!

Any ideas much appreciated.

Mike
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I have exactly the same problem, have you managed to resolve it.
Richard
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Richard

I think I have fixed it.  Using Device Manager on the PC I went into the Ports file and changed Flow Control on the Arduino port (COM 4 on my set up) from OFF to Hardware.  No more conflict, though I do now find that I reset the Arduino every time I open the Serial Monitor (but I can live with that for the time being).

HTH

Mike
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Thanks Mike, that seems to be the answer
Richard
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I do now find that I reset the Arduino every time I open the Serial Monitor (but I can live with that for the time being).
That's normal, intentional behavior.  It's a feature called "Auto-Reset".
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Capacitor Expert By Day, Enginerd by night.  ||  Personal Blog: www.baldengineer.com  || Electronics Tutorials for Beginners:  www.addohms.c

Chile
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You can avoid the reset with: http://forum.arduino.cc/index.php?topic=118440.0

Reset is still available:
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