Serial.begin(int speed)

Description

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.

Parameters

long datarate, in bits per second (baud)

Returns

nothing

Example:

void setup() {
	Serial.begin(9600);	// opens serial port, sets data rate to 9600 bps
}

void loop() {}

Arduino Mega example:

// 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() {}

Thanks to Jeff Gray for the mega example

See also

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