// LCD1602 to Arduino Uno connection example

#include <LiquidCrystal.h>

LiquidCrystal lcd(12, 11, 10, 9, 8, 7);

void setup() {
  lcd.begin(16, 2);
  // you can now interact with the LCD, e.g.:
  lcd.print("Stopwatch");
  Serial.begin(9600);

  pinMode(5, INPUT); //start
  digitalWrite(5, HIGH);
  pinMode(4, INPUT); //stop
  digitalWrite(2, HIGH);
  pinMode(2, INPUT); //lap
}


double i = 0;
double a = millis();
double c ;

void loop() {
  // ...
  // set the cursor to column 0, line 1
  // (note: line 1 is the second row, since counting begins with 0):
  lcd.setCursor(0, 1);
  // print the number of seconds since reset:
  lcd.print(millis() / 1000);
  if (digitalRead(5) == LOW) //start
  {

    lcd.clear();
    a = millis();
    while (digitalRead(4) == HIGH)
    {
      c = millis();
      i = (c - a) / 1000;
      lcd.print(i);
      lcd.setCursor(7, 0);
      lcd.print("Sec's");
      lcd.setCursor(0, 0);
      Serial.println(c);
      Serial.println(a);
      Serial.println(i);
      Serial.println("......");
      delay(100);
    }
    if (digitalRead(4) == LOW)
    {
      while (digitalRead(5) == HIGH)
      {
        lcd.setCursor(0, 0);
        lcd.print(i);
        lcd.setCursor(11, 0);
        lcd.print("");
        lcd.setCursor(0, 0);
        delay(100);
      }
    }
  }

}