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Serial

## 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() {}

Thanks to Jeff Gray for the mega example

#### See also

- Serial.end()

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