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<div class="title"><a href='http://arduino.cc/en'>Arduino</a></div>
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<p><a class='wikilink' href='Serial.html'>Serial</a>
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<p class='vspace'></p><h2>begin()</h2>
<h4>Description</h4>
<p>Sets the data rate in bits per second (baud) for serial data transmission. For communicating with the computer, use one of these rates: 300, 1200, 2400, 4800, 9600, 14400, 19200, 28800, 38400, 57600, or 115200. You can, however, specify other rates - for example, to communicate over pins 0 and 1 with a component that requires a particular baud rate.
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<p class='vspace'></p><h4>Syntax</h4>
<p>Serial.begin(speed)
</p>
<p class='vspace'></p><p><em>Arduino Mega only:</em> <br />Serial1.begin(speed) <br />Serial2.begin(speed) <br />Serial3.begin(speed)
</p>
<p class='vspace'></p><h4>Parameters</h4>
<p>speed: in bits per second (baud) - <em>long</em>
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<p class='vspace'></p><h4>Returns</h4>
<p>nothing
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<p class='vspace'></p><h3>Example:</h3>
<pre>
void setup() {
Serial.begin(9600); // opens serial port, sets data rate to 9600 bps
}
void loop() {}
</pre>
<p class='vspace'></p><p><strong>Arduino Mega example:</strong>
</p>
<p class='vspace'></p><pre>
// Arduino Mega using all four of its Serial ports
// (Serial, Serial1, Serial2, Serial3),
// with different baud rates:
void setup(){
Serial.begin(9600);
Serial1.begin(38400);
Serial2.begin(19200);
Serial3.begin(4800);
Serial.println("Hello Computer");
Serial1.println("Hello Serial 1");
Serial2.println("Hello Serial 2");
Serial3.println("Hello Serial 3");
}
void loop() {}
</pre>
<p class='vspace'></p><p><em>Thanks to Jeff Gray for the mega example</em>
</p>
<p class='vspace'></p><h4>See also</h4>
<ul><li><a class='wikilink' href='Serial_End.html'>Serial.end</a>()
</li></ul><p class='vspace'></p><p><a class='wikilink' href='index.html'>Reference Home</a>
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