Simple ReadWrite

Read data from the serial port and echoes it back to the serial monitor

char val;                   // to read the char

void setup() {
  Serial.begin(9600);
}

void loop() {
  if(Serial.available()) {  // if data available
    val = Serial.read();    // read data
    Serial.print(val);      // print it back
  }
  delay(100);               // wait 100ms for next read
}