Arduino Reference - Begin

begin()

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.

Syntax

Serial.begin(speed)

Arduino Mega only:
Serial1.begin(speed)
Serial2.begin(speed)
Serial3.begin(speed)

Parameters

speed: in bits per second (baud) - long

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 ( ) { }