#include <avr/io.h>
#include <util/delay.h>

// Define pin connections
#define ALARM_PIN 8
#define VOLUME_UP_PIN 9
#define VOLUME_DOWN_PIN 10
#define SWITCH_PIN 11

// Volume settings
#define MAX_VOLUME 10
#define MIN_VOLUME 0

void setup() {
    // Set pin directions
    pinMode(ALARM_PIN, OUTPUT);         // Set ALARM_PIN as output
    pinMode(VOLUME_UP_PIN, INPUT_PULLUP);    // Set VOLUME_UP_PIN as input with pull-up resistor
    pinMode(VOLUME_DOWN_PIN, INPUT_PULLUP);  // Set VOLUME_DOWN_PIN as input with pull-up resistor
    pinMode(SWITCH_PIN, INPUT_PULLUP);       // Set SWITCH_PIN as input with pull-up resistor

    Serial.begin(9600);
}

void loop() {
    static uint8_t volume = 5;               // Initial volume level
    static uint8_t alarm_on = 0;             // Alarm is initially off

    // Check if the switch is pressed
    if (digitalRead(SWITCH_PIN) == LOW) {
        delay(50);            // Debounce delay
        if (digitalRead(SWITCH_PIN) == LOW) {
            alarm_on = !alarm_on;  // Toggle alarm state
            while (digitalRead(SWITCH_PIN) == LOW);  // Wait for switch release
        }
    }

    // Adjust volume up
    if (digitalRead(VOLUME_UP_PIN) == LOW) {
        delay(50);            // Debounce delay
        if (digitalRead(VOLUME_UP_PIN) == LOW && volume < MAX_VOLUME) {
            volume++;
            while (digitalRead(VOLUME_UP_PIN) == LOW);  // Wait for button release
        }
    }

    // Adjust volume down
    if (digitalRead(VOLUME_DOWN_PIN) == LOW) {
        delay(50);            // Debounce delay
        if (digitalRead(VOLUME_DOWN_PIN) == LOW && volume > MIN_VOLUME) {
            volume--;
            while (digitalRead(VOLUME_DOWN_PIN) == LOW);  // Wait for button release
        }
    }

    // Control the alarm
    if (alarm_on) {
        digitalWrite(ALARM_PIN, HIGH);  // Turn on alarm
        delay(1000 / (volume + 1));  // Volume affects delay (frequency)
        digitalWrite(ALARM_PIN, LOW);   // Turn off alarm
        delay(1000 / (volume + 1));  // Volume affects delay (frequency)
    } else {
        digitalWrite(ALARM_PIN, LOW);   // Ensure alarm is off
    }

    delay(100);  // Main loop delay
}