Arduino Uno Serial Monitor / Reset

[GoogleCodeExporter]

What steps will reproduce the problem?
1. Plug the Arduino Uno
2. Start the Arduino IDE (on MacOS)
3. Open the Serial Monitor

What is the expected output? What do you see instead?
Led 13 keeps blinking, and the sketch does not seem to start.

What version of the Arduino software are you using? On what operating
system?  Which Arduino board are you using?
Board : Arduino Uno
IDE: Arduino v0021
OS : MacOS 10.6

Please provide any additional information below.
Arduino behaves normally if we first start the IDE and then plug the Arduino 
Uno and open the Serial Monitor.

Original issue reported on code.google.com by fe...@o-labs.net on 20 Nov 2010 at 7:30

[GoogleCodeExporter]

The Arduino Uno resets when I open the serial monitor on my Mac, regardless of 
whether I plugged it in before or after running the Arduino software.  What 
sketch are you running?  How can you tell that the board is not resetting when 
you open the serial monitor.  Did you select the right serial port from the 
Tools menu?

Original comment by dmel...@gmail.com on 20 Nov 2010 at 8:05

• Changed state: Invalid

[GoogleCodeExporter]

I did not mean it does not reset. But after a reset the led on pin 13 keeps 
blinking. After testing some other stuff, i am not able to reproduce it all the 
time.

Original comment by fe...@o-labs.net on 21 Nov 2010 at 4:26