#include <Button.h>
Button button1(4);

const int buttonPin = 4;
int oldValue = HIGH; // default/idle value for pin 4 is high.

// include the library code:
#include <LiquidCrystal.h>

// initialize the library by associating any needed LCD interface pin
// with the arduino pin number it is connected to
const int rs = 12, en = 11, d4 = 8, d5 = 7, d6 = 6, d7 = 5;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);


int Time_Start = 0;
int Time_End = 0;
int Time = 0;


void setup() 
{
  //Setup LCD-Display
  // set up the LCD's number of columns and rows:
  lcd.begin(16, 2);
  // Print a message to the LCD.
  lcd.print("------Time------");

  Serial.begin(115200);
  Serial.println("Press the button.");

  // Initialize the pin for reading the button.
  pinMode(buttonPin, INPUT_PULLUP);

   button1.begin();
}

void loop() 
{
  Button_Example();
}
  

void Button_Example()
{
  // Read the value of pin 4.
  int newValue = digitalRead(buttonPin);


    // Check if the value was changed,
    // by comparing it with the previous value.
    if(newValue != oldValue)
    {
      if(newValue == LOW)
      {
        Serial.println("The button is pressed.");
        Time_Start = millis()/1000;
      }
      else
      {
        Serial.println("The button is released.");
        Time_End = millis()/1000;

        Time = Time_End - Time_Start;

        //lcd.setCursor(0, 1);
        //lcd.print(Time_End);

        //lcd.setCursor(1, 1);
        //lcd.print("-");

        //lcd.setCursor(2, 1);
        //lcd.print(Time_Start);

        //lcd.setCursor(3, 1);
        //lcd.print("=");

        lcd.setCursor(4, 1);
        lcd.print(Time);

      }
      // Remember the value for the next time.
      oldValue = newValue;
    
  }
  // Slow down the sketch.
  // Also for debouncing the button.
  delay(100);
}