Serial.begin()

Description

Sets the data rate in bits per second (baud) for serial data transmission. For communicating with Serial Monitor, make sure to use one of the baud rates listed in the menu at the bottom right corner of its screen. 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.

Syntax

• Serial.begin(speed)

• Serial.begin(speed, config)

Parameters

Serial

speed

long

config

• SERIAL_5N1

• SERIAL_6N1

• SERIAL_7N1

• SERIAL_8N1

  (the default)

• SERIAL_5N2

• SERIAL_6N2

• SERIAL_7N2

• SERIAL_8N2

• SERIAL_5E1

  : even parity

• SERIAL_6E1

• SERIAL_7E1

• SERIAL_8E1

• SERIAL_5E2

• SERIAL_6E2

• SERIAL_7E2

• SERIAL_8E2

• SERIAL_5O1

  : odd parity

• SERIAL_6O1

• SERIAL_7O1

• SERIAL_8O1

• SERIAL_5O2

• SERIAL_6O2

• SERIAL_7O2

• SERIAL_8O2

Returns

Nothing

Example Code

1void setup() {
2        Serial.begin(9600); // opens serial port, sets data rate to 9600 bps
3    }
4
5    void loop() {}

Arduino Mega example:

1// Arduino Mega using all four of its Serial ports
2    // (Serial, Serial1, Serial2, Serial3),
3    // with different baud rates:
4
5    void setup() {
6      Serial.begin(9600);
7      Serial1.begin(38400);
8      Serial2.begin(19200);
9      Serial3.begin(4800);
10
11      Serial.println("Hello Computer");
12      Serial1.println("Hello Serial 1");
13      Serial2.println("Hello Serial 2");
14      Serial3.println("Hello Serial 3");
15    }
16    void loop() {}

Thanks to Jeff Gray for the mega example.

Notes and Warnings

For USB CDC serial ports (e.g.

Serial

Serial.begin()

The only

config

Serial1

SERIAL_8N1