Smart Home Security Alarm (copy) (copy) — Arduino Mega simulation

Sistem keamanan rumah dan alarm multi-bahaya menggunakan Arduino Mega dengan sensor PIR, DHT11, Keypad, LCD, dan Buzzer.

An interactive Arduino Mega circuit simulation you can run free in your browser on Velxio, by s160425118.

Components

• Resistor 220 x4
• Led x3
• Buzzer
• Grove Dht11
• Grove Gas Mq2
• Junction
• Lcd1602
• Membrane Keypad
• Pir Motion Sensor
• Pro Dc Motor

Sketch code

#include <LiquidCrystal.h>
#include <DHT.h>
#include <Keypad.h>

// ==================================================
// DHT11
// ==================================================
#define DHTPIN A0
#define DHTTYPE DHT11

DHT dht(DHTPIN, DHTTYPE);

// ==================================================
// GAS / SMOKE SENSOR (MQ2 - Grove 3 Pin)
// ==================================================
#define MQ2PIN A1
const int smokeThreshold = 400; // Threshold indikasi asap/gas (0 - 1023)

// ==================================================
// LCD 16x2 (RS, E, D4, D5, D6, D7)
// ==================================================
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

// ==================================================
// KEYPAD CONFIGURATION (4x4)
// ==================================================
const byte ROWS = 4;
const byte COLS = 4;

char keys[ROWS][COLS] = {
  {'1', '2', '3', 'A'},
  {'4', '5', '6', 'B'},
  {'7', '8', '9', 'C'},
  {'*', '0', '#', 'D'}
};

byte rowPins[ROWS] = {22, 23, 24, 25}; 
byte colPins[COLS] = {26, 27, 28, 29}; 

Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);

// Password Settings
const String CORRECT_PASSWORD = "1234";
String enteredPassword = "";
int failedAttempts = 0;
const int MAX_ATTEMPTS = 5;
bool isLocked = false;
bool passwordMode = false;

// Mode status untuk spam pesan di Serial Monitor
bool isWrongPasswordState = false;
unsigned long wrongPasswordStartMillis = 0;
const long wrongPasswordDuration = 3500; // Durasi spam WRONG PASSWORD (3.5 detik)

// ==================================================
// PIN KOMPONEN
// ==================================================
const int pirPin = 7;
const int buzzerPin = 6;
const int fanPin = 8; // Pin untuk Kipas (DC Motor)

const int ledPIRPin = 30;
const int ledTempPin = 31; // LED Merah Indikator Suhu / Fire Alarm
const int ledsafe = 17;

// ==================================================
// STATUS ALARM & TIMING
// ==================================================
bool alarmAktif = true;
unsigned long previousMillis = 0;
const long interval = 2000; // Interval pembacaan sensor

unsigned long lastSerialMsgMillis = 0;
const long serialInterval = 800; // Interval spam pesan serial (0.8 detik)

void setup() {
  pinMode(pirPin, INPUT);
  pinMode(buzzerPin, OUTPUT);
  pinMode(fanPin, OUTPUT); // Set pin Kipas sebagai OUTPUT
  pinMode(ledPIRPin, OUTPUT);
  pinMode(ledTempPin, OUTPUT);
  pinMode(ledsafe, OUTPUT);

  Serial.begin(9600);

  lcd.begin(16, 2);
  lcd.clear();

  dht.begin();

  noTone(buzzerPin);
  digitalWrite(buzzerPin, LOW);
  digitalWrite(fanPin, LOW); // Kipas mati saat awal dinyalakan
  digitalWrite(ledPIRPin, LOW);
  digitalWrite(ledTempPin, LOW);
  digitalWrite(ledsafe, HIGH);

  lcd.setCursor(0, 0);
  lcd.print("SYSTEM ARMED");
  lcd.setCursor(0, 1);
  lcd.print("Initializing...");

  Serial.println("SYSTEM ARMED");
  Serial.println("DHT11 & MQ2 Starting...");
  Serial.println("------------------------------------

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• Smart Home Security Alarm (copy) — Arduino Mega
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