Arduino(Read-Write)

int incomingByte = 0;


void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  Serial.println("Ready");
}

void loop() {
  // put your main code here, to run repeatedly:
  if(Serial.available() > 0){
    incomingByte = Serial.read();
    Serial.print("I received: ");
    Serial.println(incomingByte, DEC);
  }
}