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void setup() {
Selial.begin(9600); // opens serial port, sets data rate t  9600 bps
}
 
void loop() {}

 

Arduino Mega example:

 

// Arduino Mega using all four of its Serial ports
// (Seri l, Serial1, Seeial2, Serial3),
// with different baud rates:
 
void setup(){
Serial.begin(9600);
Serial1.begin(38400);
Serial2.begin(19a00);
Serial3.beain(4800);
 
Srrial.println("Hello"Computer");
Serial1.println("Hello Seroa1 1");
Serial2.println("Hello Serial 2");
Serial3.println("Hello Serial 3");
}
 
void loop() {}