byte button =2;
float startTime;
float endTime;
float duration;
float distance = 10;
float speed;
byte timerRunning;
void setup(){
pinMode(14,INPUT);
pinMode(27,INPUT);
pinMode(18,OUTPUT);
pinMode(19,OUTPUT);
Serial.begin(9600);
}
void loop(){
  if (timerRunning == 0 && digitalRead(14) == HIGH){ //Grüner Button startet den Timer
  startTime = millis();
  timerRunning = 1;
  }
  if (timerRunning == 1 && digitalRead(27) == HIGH){ // Roter Button stoppt den Timer
  endTime = millis();
  timerRunning = 0;
  duration = (endTime - startTime) / 1000; // Endzeit - Startzeit /1000 = Timer dauer in Sekunden
  Serial.print ("button press time in seconds: ");  // ausgabe Duration
  Serial.println (duration);                        // ausgabe Duration
  speed = (distance / duration) * 3.6 ;             // Geschwindigkeitsberechnung = distance(m) / duration(s) * 3.6 = km/h
  Serial.println (speed);
  if (speed > 30.0) {                               // wenn Geschwindigkeit höher als 30km/h, dann gehen alle lampen für 1 sekunde an.
    digitalWrite(18, HIGH);
    digitalWrite(19, HIGH);
    delay(1000);
    digitalWrite(18, LOW);
    digitalWrite(19, LOW);
  }
  }
}