Published July 6, 2021 © CC BY-SA

IoT based Door Security Alarm Project with Blynk

Today security is one of the prime aspect in our society. Securing our home and family is important.

BeginnerFull instructions provided1 hour3,969

IoT based Door Security Alarm Project with Blynk

Things used in this project

Hardware components

Espressif Wemos D1 Mini

magnetic Door Sensor

Arduino Nano R3

LED (generic)

Buzzer

Software apps and online services

Arduino IDE

Blynk

Story

In this article we will see how to make a IoT based Door Security Alarm using Blynk.

Today security is one of the prime aspect in our society. Securing our home and family is important.This is a simple but effective door security system.

Parts List

This project requires simple components and modules. These are easily available in the market.

WeMos D1 Mini x 1
Magnetic Door Sensor x 1
Buzzer 5V x 1
Transistor BC547 x 1
Resistor 330Ω x 3
LED x 2
2 Pin Screw connector x 1
Male/Female berg strip x 1 (Each)
Dotted PCB small x 1

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How it Works?

WeMos D1 Mini wifi module constantly checks the status of magnetic door sensor. If there is a change in door sensor the alarm gets activated and buzzer beeps. IoT based Door Security Alarm will also notify you through your smartphone using blynk app.

There are two modes available to set. You can enable the alarm when you are not at home or when you think it should be enabled.

Alarm ON – In this mode if door is opened buzzer will start beeping and you will be notified via Blynk app.
Alarm OFF – In this mode there will be no buzzer beeps neither blynk notification.

Magnetic Door Sensor

Magnetic Door sensor is used to detect the movement of the door. These sensors are available in two types.

Normally Open
Normally Closed

In this project we are using normally open type.

How does Magnetic Door Sensor work?

It’s very very simple.

The electrical circuit is closed when a magnet is near the switch (less than 13 mm (0.5’’) away). When the magnet is far away from the switch, the circuit is open. See the figure below.

WeMos D1 Mini

This wifi module is used to connect with internet and send data to blynk app. This also controls buzzer and Led’s as per the code.

Blynk Setup

Open Blynk app and tap on New Project

Give a name of the Project, Select Device as WeMos D1 Mini, Connection Type Wi-Fi and tap on Create

You will receive an email with Auth Token. Tap on OK

Tap on + Button to add widgets Labeled Value

Add Notification Widget

Add Segmented Switch

Configure Labeled Value Setting as per below

Configure Segmented Switch Setting as per below

Configure Notification Setting as per below

Finally the complete setup

Code

The code is simple and easy to understand. Just update the Auth Token, Network SSID and Password. You can download the code from thislink and upload the code in wifi module using Arduino IDE.

Conclusion

IoT based Door Security Alarm is a economical project which can be built by beginners.

This project will help you to interface magnetic door sensor with WeMos D1 Mini. Also you will be able to learn interfacing blynk to make the project IoT based.

Code

Code

//nextpcb
//Blynk Door Security Notification System

#define BLYNK_PRINT Serial
#include <ESP8266WiFi.h>
#include <BlynkSimpleEsp8266.h>
BlynkTimer timer;
char auth[] = "xxxxx"; //Enter the authentication code sent by Blynk to your Email
char ssid[] = "xxxxx"; //Enter your WIFI SSID
char pass[] = "xxxxx"; //Enter your WIFI Password
int flag=0;



void notifyOnButtonPress()
{
  int isButtonPressed = digitalRead(D1);
  if (isButtonPressed==1 && flag==0) {
    Serial.println("Someone Opened the door");
    Blynk.notify("Alert : Someone Opened the door");
    flag=1;
  }
  else if (isButtonPressed==0)
  {
    flag=0;
  }
}
void setup()
{
Serial.begin(9600);
Blynk.begin(auth, ssid, pass);
pinMode(D1,INPUT_PULLUP);
timer.setInterval(16000L,notifyOnButtonPress); 
}
void loop()
{
  Blynk.run();
  timer.run();
}