long randNumber; //settings
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C Lcd(0x27,16,2);
unsigned long myTime1;
unsigned long myTime2;
const int LED_PIN = 6;
const int TASTER_PIN = 3;
int PIEZO_PIN = 5;
void setup() {//setup
  Lcd.backlight();
  pinMode(LED_PIN, OUTPUT);
  pinMode(TASTER_PIN, INPUT_PULLUP);
  Serial.begin(9600);
  Lcd.init();
  Lcd.print("NWT Projekt Game");
  delay(200);
}
void loop() { //loop
  int zahl = random(0,2);
  int tasterValue = digitalRead(TASTER_PIN);
  while (tasterValue == 1) {
  tasterValue = digitalRead(TASTER_PIN);
  }
  Lcd.clear();
Lcd.print("START"); //rolling display
  for (int i = 0; i < 10; i++) {
  Lcd.scrollDisplayRight();
  delay(50);
  }
  Lcd.scrollDisplayRight();
  Lcd.clear();
  Lcd.setCursor(0,0);
  delay(50);
  Lcd.clear();
  Lcd.setCursor(11,4);
  Lcd.print("START");
  for (int i = 0; i < 12; i++) {
  Lcd.scrollDisplayLeft();
  delay(50);
  }
  Lcd.setCursor(0,0);
  Lcd.clear();
  Lcd.print("Press Button");
  delay(350);
  Lcd.clear();
tasterValue = digitalRead(TASTER_PIN);
if (tasterValue == 0) { //if statement LED&PIEZO
  if (zahl == 1) {
  digitalWrite(LED_PIN, HIGH);
  Serial.println("if clause 1 starting LED"); 
  } 
  else {
  tone(PIEZO_PIN,523);
  }
  myTime1 = millis();
  while (tasterValue == 0) {
  tasterValue = digitalRead(TASTER_PIN);
  }
  myTime2 = millis();

  digitalWrite(LED_PIN, LOW);
  Lcd.println("Reaktionszeit: ");
  delay(1000);
  Lcd.clear();
  Lcd.println(myTime2-myTime1);
  delay(1000);
  Lcd.print("ms");
  }
  else {
  Lcd.print("Nicht schummeln!");
  delay(1000);
  }
}