DIY Home Security System using the Arduino Nano ESP32

1#include "thingProperties.h"
2
3// Pins
4#define PIR_PIN 2
5#define SMOKE_PIN 3
6#define BUZZER_PIN 4
7
8void setup() {
9  Serial.begin(115200);
10  delay(1500);
11
12  pinMode(PIR_PIN, INPUT);
13  pinMode(SMOKE_PIN, INPUT);
14  pinMode(BUZZER_PIN, OUTPUT);
15
16  initProperties();
17  ArduinoCloud.begin(ArduinoIoTPreferredConnection);
18
19  Serial.println("✅ Setup complete, waiting for events...");
20}
21
22void loop() {
23  ArduinoCloud.update();
24
25  // Read sensors
26  bool motion = digitalRead(PIR_PIN);
27  bool smoke = digitalRead(SMOKE_PIN);
28
29  // Update cloud variables
30  intruderAlert = motion;
31  smokeAlert = smoke;
32
33  // Logic:
34  // If dashboard switch = OFF → buzzer must stay OFF
35  if (!alarmControl) {
36    digitalWrite(BUZZER_PIN, LOW);
37    Serial.println("🔕 Buzzer OFF (dashboard override)");
38  } 
39  else {
40    // Dashboard = ON → allow sensors to control buzzer
41    if (motion || smoke) {
42      digitalWrite(BUZZER_PIN, HIGH);
43      Serial.println("🔔 Buzzer ON (motion/smoke detected)");
44    } else {
45      digitalWrite(BUZZER_PIN, LOW);
46      Serial.println("🔕 Buzzer OFF (no danger)");
47    }
48  }
49
50  delay(200);
51}
52
53// Callback: runs when dashboard switch changes
54void onAlarmControlChange() {
55  Serial.print("Alarm control set to: ");
56  Serial.println(alarmControl ? "ON (sensors active)" : "OFF (override, muted)");
57}