/*
  Wokwi | general
  Fatin — 12/19/24 at 10:50 PM
  ok so this is actually a circuit where i would
  like to control my led to specific time (on/off),
  but the coding itself is wrong. so i don't really
  know what to do. help please
*/

#include <LiquidCrystal_I2C.h>

const int NUM_BTNS = 4;
const int BTN_PINS[] = {8, 9, 10, 11};
const int BUZZ_PIN  = 12;
const int RELAY_PIN = 13;

int btnState[NUM_BTNS];
int oldBtnState[NUM_BTNS];
unsigned long delayTime = 1000;
unsigned long prevTime = 0;

LiquidCrystal_I2C lcd(0x27, 16, 2);

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

  for (int i = 0; i < NUM_BTNS; i++) {
    // check each button
    btnState[i] = digitalRead(BTN_PINS[i]);
    if (btnState[i] != oldBtnState[i])  { // if it changed
      oldBtnState[i] = btnState[i];       // remember state for next time
      if (btnState[i] == LOW)  {          // was just pressed
        btnPressed = i + 1;
        Serial.print("Button ");
        Serial.print(btnPressed);
        Serial.println(" pressed");
        //digitalWrite(LED_PINS[i], HIGH);
      } else {                            // was just released
        //digitalWrite(LED_PINS[i], LOW);
      }
      delay(20);  // debounce
    }
  }
  return btnPressed;
}

void setup() {
  Serial.begin(9600);
  lcd.init();
  lcd.backlight();
  for (int i = 0; i < 4; i++) {
    pinMode(BTN_PINS[i], INPUT_PULLUP);
  }
  pinMode(BUZZ_PIN, OUTPUT);
  pinMode(RELAY_PIN, OUTPUT);
  lcd.print("Ready");
  delay(1000);
  lcd.clear();
}

void loop() {
  int btnNumber = checkButtons();
  if (btnNumber)  {
    lcd.clear();
    lcd.print(btnNumber);
  }

/*
  digitalWrite(RELAY_PIN, HIGH);
  tone(BUZZ_PIN, 440, 100);
  delay(1000);
  digitalWrite(RELAY_PIN, LOW);
  delay(1000);
*/
}