Arduino : serial example

serial.c

void setup() {
  // initialize digital pin 13 as an output.
  pinMode(13, OUTPUT);
  Serial.begin(9600);
}
 
// the loop function runs over and over again forever
void loop() {
  String msg = "";
  digitalWrite(13, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(1000);              // wait for a second
  digitalWrite(13, LOW);    // turn the LED off by making the voltage LOW
  delay(1000);              // wait for a second
  if(Serial.available())    // Serial.available() : Get the number of bytes (characters) available for reading from the serial port. This is data that’s already arrived and stored in the serial receive buffer (which holds 64 bytes).
  {
    msg = Serial.readString(); // Serial.readString() : Serial.readString() reads characters from the serial buffer into a String. The function terminates if it times out (see setTimeout()).
    Serial.println("aryud"+msg); //  Serial.println() : Prints data to the serial port as human-readable ASCII text followed by a carriage return character (ASCII 13, or '\r') and a newline character (ASCII 10, or '\n'). This command takes the same forms as Serial.print().
  }
}


//출처: https://micropilot.tistory.com/2869 []