void setup() {
  // max baud rate  
  Serial.begin(2000000);
  Serial.println("Serial PPS generator v0.1 started");
  pinMode(13, OUTPUT);    // sets the digital pin 13 as output
}

int incomingByte = 0; // for incoming serial data
void loop() {
  if (Serial.available() > 0) {
    // read the incoming byte:
    incomingByte = Serial.read();
    digitalWrite(13, HIGH); // sets the digital pin 13 on
    delay(10);              // waits for 10 ms
    digitalWrite(13, LOW);  // sets the digital pin 13 off
  }
}