#include <LiquidCrystal.h>

const int rs = 12, en = 11, d4 = 5, d5 = 4, d6 = 3, d7 = 2;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);

const int potentiometerPin = A0;
const int threshold = 512; // Пороговое значение

void setup() {
  lcd.begin(16, 2);

  lcd.print("Smoke Detector");
  delay(1000);

  lcd.clear();
  lcd.print("RA252 BY UZAP");
  delay(1000);

  lcd.clear();
  showLoadingBar();

  lcd.clear();
  lcd.print("OK");
}

void loop() {
  int potValue = analogRead(potentiometerPin);

  if (potValue >= threshold) {
    lcd.clear();
    lcd.print("WARNING FIRE");
    while (potValue >= threshold) {
      potValue = analogRead(potentiometerPin);
      delay(100);
    }
    lcd.clear();
    lcd.print("OK");
  }

  delay(100);
}

void showLoadingBar() {
  for (int i = 0; i <= 100; i++) {
    displayProgressBar(i);
    delay(50);
  }
}

void displayProgressBar(int percent) {
  lcd.setCursor(0, 1);
  lcd.print("[");
  for (int i = 0; i < 14; i++) {
    if (i < (percent / 6)) {
      lcd.write((byte)255);
    } else {
      lcd.print(" ");
    }
  }
  lcd.print("]");
  lcd.print(percent);
  lcd.print("%");
}