#include <LiquidCrystal.h>

LiquidCrystal lcd(7,6,5,4,3,2);

long myTime_start;
long myTime_stop;
long myTime_dif;
bool running =  false;


void setup() {

lcd.begin(16,2);
pinMode(8, INPUT);
pinMode(9, INPUT);
pinMode(13, OUTPUT);
digitalWrite(8, HIGH);
digitalWrite(9, HIGH);
int startPin = 9;
int stopPin = 8;
 
}

void loop() {

  //digitalWrite(13, digitalRead(8));

  if (digitalRead(startPin) == LOW && !running) {
    myTime_start = millis();
    running = true;
    



  }

   if (digitalRead(stopPin) == LOW && running) {
    myTime_stop = millis();
    running = false;
    
    //Gesammte zeit zu Schluss ausgeben
    myTime_dif = millis() - myTime_start;
  }

  if (running) {
    myTime_dif = millis() - myTime_start;
    lcd.print(myTime_dif);
    running = false;

  }

}