Files
README.mdSmartHomeSecurity.ino
A 24/7 home security solution that detects:
- Intrusion via PIR motion sensor
- Door/window open via magnetic reed switch
- Gas leak via MQ-2 combustible gas sensor
When any alarm triggers, the system sounds a buzzer, flashes an LED, and sends a push notification to your smartphone via Blynk.
- 1 × NodeMCU ESP8266 board
- 1 × PIR motion sensor (HC-SR501)
- 1 × Magnetic reed switch + magnet
- 1 × MQ-2 gas sensor module + pull-down resistor (10 kΩ)
- 1 × Active buzzer
- 1 × LED (5 mm) + resistor (220 Ω)
- 1 × Breadboard + jumper wires
- 1 × USB cable for power/programming
- Software: Blynk app (iOS/Android), Blynk library
NodeMCU ESP8266 Sensor/Actuator
┌─────────────────┐ ┌───────────────┐
│ VIN (5 V) ──► Vcc │ PIR motion │
│ GND ────────► GND │ PIR motion │
│ D5 ────────► OUT │ PIR motion │
├─────────────────┤
│ 3V3 ────────► Vcc │ MQ-2 gas │
│ GND ────────► GND │ MQ-2 gas │
│ A0 ────────► AO │ MQ-2 gas │
├─────────────────┤
│ D6 ────────► one side │ Reed switch │
│ GND ────────► other │ Reed switch │
├─────────────────┤
│ D7 ────────► Anode │ LED (+ 220 Ω) │
│ GND ────────► Cathode │ LED │
├─────────────────┤
│ D8 ────────► + │ Buzzer (+) │
│ GND ────────► – │ Buzzer (–) │
└─────────────────┘
Note: MQ-2 analog output goes to A0. Adjust its onboard potentiometer for threshold.
- Install the Blynk app on your phone.
- Create a new “Device”: select ESP8266, connection Wi-Fi.
- Copy the Auth Token emailed to you.
- In the app, add a Notification widget.
- Edit
SmartHomeSecurity.inowith yourWIFI_SSID,WIFI_PASSandBLYNK_AUTH. - Open project folder in Arduino IDE.
- Install libraries:
- Blynk (BlynkSimpleEsp8266)
- Select NodeMCU 1.0 (ESP-12E Module), correct port.
- Compile & Upload.
- Open the Blynk app, start the dashboard.
- Arm the system by resetting power; any motion, door-open, or gas leak triggers alarm and push notification.
Say continua to move on to project #3!