#include <LiquidCrystal.h>

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

const int coinPin = 1;
const int relay1Pin = 4;
const int relay2Pin = 5;
const int countdownTime = 600; // 10 minutes in seconds

unsigned long previousMillis = 0;
int coinCount = 0;
int countdown = countdownTime;

void setup() {
  lcd.begin(16, 2);
  lcd.print("Coin Counter");

  pinMode(relay1Pin, OUTPUT);
  pinMode(relay2Pin, OUTPUT);

  attachInterrupt(digitalPinToInterrupt(coinPin), coinInterrupt, FALLING);
}

void loop() {
  unsigned long currentMillis = millis();

  if (countdown > 0) {
    if (currentMillis - previousMillis >= 1000) {
      previousMillis = currentMillis;
      countdown--;
      updateDisplay();
    }
  } else {
    digitalWrite(relay2Pin, LOW); // Turn off relay 2
  }
}

void coinInterrupt() {
  coinCount++;
  updateDisplay();

  if (coinCount >= 2) {
    coinCount = 0;
    countdown += countdownTime; // Increment countdown by 10 minutes
    digitalWrite(relay2Pin, HIGH); // Turn on relay 2
  }
}

void updateDisplay() {
  lcd.setCursor(0, 1);
  lcd.print("Coins: ");
  lcd.print(coinCount);
  lcd.print("   ");

  lcd.setCursor(9, 1);
  lcd.print("Time: ");
  lcd.print(countdown);
  lcd.print("s   ");
}