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.
Serial.begin(speed)
Arduino Mega only:
Serial1.begin(speed)
Serial2.begin(speed)
Serial3.begin(speed)
speed: in bits per second (baud) - long
nothing
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