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As you know, the Arduino IDE resets the Arduino when the Serial Monitor is opened. I want also my program to do it. But I don't know how.

I examined the source code of the Arduino IDE (Serial.java & SerialMonitor.java), but I can't find where it sends the reset command. Where is it?

I use C# to communicate with serial.

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OK, I have solved this by sending DSR pulse as seen on code below:

mySerial.DtrEnable = true;
mySerial.Open();
Thread.Sleep(1000);
mySerial.DtrEnable = false;
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  • 3
    FYI: The Leonardo's reset is triggered when the Leonardo's virtual (CDC) serial / COM port is opened at 1200 baud and then closed – mpflaga Oct 24 '14 at 14:19

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