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/* Button Press Detection with Interrupts
 * Authors: Ron And Nitsan
 * Purpose: Activate LED and buzzer after a set number of button presses within a time limit
 */

// Pin Definitions
const int BUTTON_PIN = 2;  // Pin connected to the button
const int LED_PIN = 5;     // Pin connected to the LED
const int BUZZER_PIN = 6;  // Pin connected to the buzzer

// Configuration
const int PRESS_THRESHOLD = 5;          // Number of presses required
const unsigned long TIME_WINDOW = 5000; // Time limit in milliseconds

// Variables
volatile int pressCount = 0;            // Count of button presses
volatile bool buttonPressed = false;    // Tracks if button press has occurred
unsigned long lastPressTime = 0;        // Time of last button press

void setup() {
  Serial.begin(9600);                   // Initialize serial communication for debugging

  // Pin Modes
  pinMode(LED_PIN, OUTPUT);             // Set LED pin as output
  pinMode(BUZZER_PIN, OUTPUT);          // Set buzzer pin as output
  pinMode(BUTTON_PIN, INPUT_PULLUP);    // Set button pin as input with pull-up resistor

  // Interrupt Setup
  attachInterrupt(digitalPinToInterrupt(BUTTON_PIN), buttonPressISR, FALLING);
}

void loop() {
  // Check if the button press flag is set
  if (buttonPressed) {
    // Record time of button press and reset the flag
    lastPressTime = millis();
    pressCount++;
    buttonPressed = false; // Reset the flag
  }

  // Check if enough time has passed since the last button press
  if (millis() - lastPressTime >= TIME_WINDOW) {
    pressCount = 0; // Reset press count if time limit exceeded
  }

  // Check if the required number of presses is reached
  if (pressCount >= PRESS_THRESHOLD) {
    activateAlert(); // Activate LED and buzzer
    pressCount = 0;  // Reset press count
  }

  // Ensure LED and buzzer are turned off
  digitalWrite(LED_PIN, LOW);
  noTone(BUZZER_PIN);

  // Debug: Print current time
  Serial.print("Current time: ");
  Serial.println(millis());
}

// Interrupt Service Routine for button press
void buttonPressISR() {
  buttonPressed = true;       // Set flag indicating button press
}

// Function to activate the LED and buzzer
void activateAlert() {
  unsigned long alertStartTime = millis(); // Record start time of alert

  // Keep LED and buzzer on for 5 seconds
  while (millis() - alertStartTime < 5000) {
    digitalWrite(LED_PIN, HIGH);   // Turn on LED
    tone(BUZZER_PIN, 576);         // Play buzzer tone at 576 Hz
  }

  // Ensure LED and buzzer are turned off
  digitalWrite(LED_PIN, LOW);
  noTone(BUZZER_PIN);
}