#include <LiquidCrystal.h>
constexpr byte led1 = 10;
constexpr byte button = A5;
int val;
int points = 0;
const int rs = 12, en = 11, d4 = 5, d5 = 4, d6 = 3, d7 = 2;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);

constexpr unsigned long BLINK_DELAY {1500};
unsigned long delayStart;

void setup() {
  Serial.begin(115200);
  lcd.begin(16, 2);
  pinMode(button, INPUT);
  pinMode(led1, OUTPUT);
  delayStart = BLINK_DELAY;
}


void loop() {
  static bool isLedOn {false};
  static bool doCount {false};

  if (millis() - delayStart > BLINK_DELAY) {
    delayStart = millis();
    (isLedOn = !isLedOn) ? digitalWrite(led1, HIGH) : digitalWrite(led1, LOW);
    doCount = (val == HIGH) ? false : true; // A continuous keystroke must not increase the counter.
  }
  val = digitalRead(button);
  if (val == HIGH && isLedOn == true && doCount == true) {
    ++points;
    doCount = false;
    Serial.println(points);
    lcd.setCursor(0, 0);
    lcd.print("Points");
    lcd.setCursor(0, 1);
    lcd.print(points);
  }
}