#include <LiquidCrystal.h>

// Define LCD and component pins
static const uint8_t LCD_RS = 7U;
static const uint8_t LCD_E  = 8U;
static const uint8_t LCD_D4 = 9U;
static const uint8_t LCD_D5 = 10U;
static const uint8_t LCD_D6 = 11U;
static const uint8_t LCD_D7 = 12U;

static const uint8_t LED_PIN = 2U;
static const uint8_t BUZZER_PIN = 3U;
static const uint8_t BUTTON_PIN = 4U;

static LiquidCrystal lcd(LCD_RS, LCD_E, LCD_D4, LCD_D5, LCD_D6, LCD_D7);

void setup(void) {
    pinMode(LED_PIN, OUTPUT);
    pinMode(BUZZER_PIN, OUTPUT);
    pinMode(BUTTON_PIN, INPUT_PULLUP);  // Use internal pull-up resistor

    lcd.begin(16U, 2U);  // Initialize LCD (16 columns, 2 rows)
    
    lcd.setCursor(0U, 0U);
    lcd.print("LED: OFF BZR: OFF");

    lcd.setCursor(0U, 1U);
    lcd.print("BTN: NOT Pressed");
}

void loop(void) {
    uint8_t buttonState = digitalRead(BUTTON_PIN);
    uint8_t ledState = digitalRead(LED_PIN);
    uint8_t buzzerState = digitalRead(BUZZER_PIN);

    // Toggle LED and Buzzer when button is pressed
    if (buttonState == LOW) {
        digitalWrite(LED_PIN, HIGH);
        digitalWrite(BUZZER_PIN, HIGH);
    } else {
        digitalWrite(LED_PIN, LOW);
        digitalWrite(BUZZER_PIN, LOW);
    }

    // Update LCD display
    lcd.setCursor(5U, 0U);
    if (ledState == HIGH) {
        lcd.print(" ON ");
    } else {
        lcd.print("OFF");
    }

    lcd.setCursor(13U, 0U);
    if (buzzerState == HIGH) {
        lcd.print(" ON ");
    } else {
        lcd.print("OFF");
    }

    lcd.setCursor(5U, 1U);
    if (buttonState == LOW) {
        lcd.print("Pressed ");
    } else {
        lcd.print("NOT Pressed");
    }

    delay(200U);  // Small delay for debounce
}