Sets the data rate in bits per second (baud) for serial data transmission. For communicating with the computer, use one of these rates: 300, 600, 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.

An optional second argument configures the data, parity, and stop bits. The default is 8 data bits, no parity, one stop bit.

Serial.begin(speed)
Serial.begin(speed, config)

Serial3.begin(speed)
Serial1.begin(speed, config)
Serial2.begin(speed, config)
Serial3.begin(speed, config)

speed: in bits per second (baud) - long
config: sets data, parity, and stop bits. Valid values are :

• SERIAL_5N1
• SERIAL_6N1
• SERIAL_7N1
• SERIAL_8N1 (the default)
• SERIAL_5N2
• SERIAL_6N2
• SERIAL_7N2
• SERIAL_8N2
• SERIAL_5E1
• SERIAL_6E1
• SERIAL_7E1
• SERIAL_8E1
• SERIAL_5E2
• SERIAL_6E2
• SERIAL_7E2
• SERIAL_8E2
• SERIAL_5O1
• SERIAL_6O1
• SERIAL_7O1
• SERIAL_8O1
• SERIAL_5O2
• SERIAL_6O2
• SERIAL_7O2
• SERIAL_8O2

(:include Reference/SerialSeeAlsoIncludes:)

(:source lang=arduino tabwidth=4:)

(:sourceend:)

(:source lang=arduino tabwidth=4:)

(:sourceend:)

• Serial.end()

Serial

begin()

Syntax

Serial.begin(speed)

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

speed: in bits per second (baud) - long

long datarate, in bits per second (baud)

void loop() {}

void loop() {}

// Arduino Mega using all four of its Serial ports // (Serial, Serial1, Serial2, Serial3), // with different baud rates:

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");
}

Thanks to Jeff Gray for the mega example

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.

int datarate, in bits per second (baud)

• Serial.available()
• Serial.read()
• Serial.print(data)
• Serial.println(data)

Serial.begin(int speed)

See also

int Serial.read()

Reference Home

Reference Home

int serialRead()

Description

Sets the data rate in bits per second for serial data transmission.

Parameters

int datarate, in bits per second.

Returns

nothing

See also

Example:

@]

Reference Home?

Serial.begin(speed);

sets the data rate for serial data transmission.

Example:

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