/*
  Wokwi | projects
  Need help with a speaker with lcd screen
  armin Wednesday, December 10, 2025 6:30 PM
  i really dont know what i did wrong, im new to this, so any help would come in handy.
  This is the link https://wokwi.com/projects/449989709560970241
*/

#include <Wire.h>
#include <LiquidCrystal.h>
#include <RTClib.h>

const int NUM_BTNS = 3;
const int BUZZER_PIN =  6;
const int BTN_PINS[] = {5, 4, 3};

int alarmHour = 0;
int alarmMinute = 0;
int btnState[NUM_BTNS];
int oldBtnState[NUM_BTNS];

LiquidCrystal lcd(12, 11, 10, 9, 8, 7);
RTC_DS1307 rtc;

void setAlarmTime() {
  char dispBuffer[16];

  // Increment the alarm hour when UP_BTN_PIN is pressed
  if (digitalRead(BTN_PINS[0]) == LOW) {
    alarmHour++;
    if (alarmHour > 23) {
      alarmHour = 0;
    }
    delay(200);
  }
  // Decrement the alarm hour when DN_BTN_PIN is pressed
  if (digitalRead(BTN_PINS[1]) == LOW) {
    alarmHour--;
    if (alarmHour < 0) {
      alarmHour = 23;
    }
    delay(200);
  }
  // Display the alarm time on the LCD
  snprintf(dispBuffer, 15, "Alarm: %2d:%02d", alarmHour, alarmMinute);
  lcd.setCursor(0, 0);
  lcd.print(dispBuffer);
}

void activateAlarm() {
  // Sound the buzzer for 5 seconds
  for (int i = 0; i < 5; i++) {
    //digitalWrite(BUZZER_PIN, HIGH);
    tone(BUZZER_PIN, 1000);
    delay(500);
    //digitalWrite(BUZZER_PIN, LOW);
    noTone(BUZZER_PIN);
    delay(500);
  }
}

// function returns which button was pressed, or 0 if none
int checkButtons()  {
  int btnPressed = 0;

  for (int i = 0; i < NUM_BTNS; i++) {
    btnState[i] = digitalRead(BTN_PINS[i]); // check each button
    if (btnState[i] != oldBtnState[i])  {   // if it changed
      oldBtnState[i] = btnState[i];         // remember state for next time
      if (btnState[i] == 0)  {              // was just pressed
        btnPressed = i + 1;
      }
      delay(20);  // debounce
    }
  }
  return btnPressed;
}

void setup() {
  Serial.begin(115200);
  lcd.begin(16, 2);
  rtc.begin();
  // Set the time of RTC if it's not set
  if (!rtc.isrunning()) {
    rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
  }
  for (int i = 0; i < NUM_BTNS; i++)  {
    pinMode(BTN_PINS[i], INPUT_PULLUP);
  }
  //pinMode(SET_BTN_PIN, INPUT_PULLUP);
  //pinMode(UP_BTN_PIN, INPUT_PULLUP);
  //pinMode(DN_BTN_PIN, INPUT_PULLUP);
  pinMode(BUZZER_PIN, OUTPUT);
  // Attach an interrupt to the SET_BTN_PIN pin
  //attachInterrupt(digitalPinToInterrupt(SET_BTN_PIN), setAlarmTime, FALLING);
  Serial.println("Ready");
  lcd.print("Alarm System");
}

void loop() {
  char dispBuff[16];

  int btnNum = checkButtons();
  if (btnNum) {
    Serial.print("Button ");
    Serial.print(btnNum);
    Serial.println(" pressed");
    if (btnNum == 3)  {
      setAlarmTime();
    }
  }
  // Read the current time from RTC
  DateTime now = rtc.now();
  // Display the current time on the LCD
  lcd.setCursor(4, 1);
  snprintf(dispBuff, 16, "%2d:%02d:%02d", now.hour(), now.minute(), now.second());
  lcd.print(dispBuff);
  // Check if the alarm time is reached
  if (now.hour() == alarmHour && now.minute() == alarmMinute) {
    activateAlarm();
  }
}