DEV Community: Md Sazzadul islam

How I Built a WiFi Motion Detection App Using RSSI in Flutter

Md Sazzadul islam — Tue, 19 May 2026 11:07:25 +0000

WiFi signals are everywhere around us.

But most people only think of WiFi as internet connectivity.

What many don’t realize is that WiFi signals can also be used for experimental human sensing — including motion detection, presence estimation, breathing monitoring, and activity analysis.

Recently, I started building an experimental Flutter application called:

SenseWave: WiFi Motion Detector

The app explores how RSSI (Received Signal Strength Indicator) fluctuations can be analyzed in real time to estimate environmental changes caused by human movement.

This project combines:

Flutter
Android native WiFi scanning
RSSI signal analysis
Realtime visualization
Signal processing
Motion analytics

without using:

Camera
Microphone
Bluetooth
External sensors

What Is RSSI?

RSSI stands for:

Received Signal Strength Indicator

Every WiFi packet received by your device has a signal strength value.

Example:

-45 dBm → Strong signal
-72 dBm → Weak signal

When humans move inside a room, they affect:

signal reflections
attenuation
multipath propagation
interference patterns

These small fluctuations can be analyzed to estimate motion and environmental activity.

What My App Can Detect

The app is experimental, but currently focuses on:

1. Presence Detection

Estimate whether someone is inside a room by analyzing RSSI variance and signal instability.

Use cases:

smart home occupancy
room activity monitoring
automation triggers

2. Motion Detection

Human movement causes rapid RSSI fluctuations.

The app analyzes:

variance
signal spikes
temporal instability

to estimate:

movement intensity
room activity level
motion events

3. Approximate Position Heatmap

Using RSSI changes from nearby access points, the app can generate an approximate activity heatmap.

Important:
This is NOT precise indoor positioning.

It is an experimental approximation based on signal disturbance.

4. Breathing Detection (Experimental)

Breathing creates micro signal fluctuations.

Using:

FFT analysis
low-pass filtering
periodicity detection

the app attempts to estimate breathing rate under controlled conditions.

Best results:

single person
short distance
minimal interference

5. Sleep Monitoring

The app can also analyze:

breathing stability
nighttime motion
movement interruptions

to create experimental sleep activity analytics.

6. Walking Pattern Recognition

Walking generates periodic RSSI peaks.

By analyzing:

frequency patterns
step periodicity
motion rhythm

the app estimates:

walking activity
movement intensity
approximate step frequency

Signal Processing

RSSI data is noisy.

To improve stability, I use:

moving average filters
FFT
Kalman filtering
variance analysis
peak detection

These help extract meaningful patterns from unstable WiFi signals.

Why This Technology Is Interesting

WiFi sensing could eventually enable:

smarter homes
contactless monitoring
occupancy automation
low-cost environmental sensing

without requiring cameras or wearable devices.

The combination of:

RF sensing
mobile apps
realtime signal processing
machine learning

opens many exciting possibilities.

Final Thoughts

Building SenseWave has been one of the most interesting Flutter projects I’ve worked on.

It combines:

mobile engineering
RF sensing
signal processing
realtime visualization
experimental AI concepts

all inside a Flutter application.

WiFi signals contain much more information than most people realize.

And we are only beginning to explore what’s possible.

Follow My Project

App:

SenseWave: WiFi Motion Detector

Exploring realtime RSSI-based human sensing using Flutter and Android.

Travel Trip Hub: Your Complete Travel Agency Solution

Md Sazzadul islam — Sun, 29 Dec 2024 05:32:29 +0000

Travel Trip Hub: Your Complete Travel Agency Solution

Managing a travel agency can be complex, but with Travel Trip Hub, it doesn’t have to be. Designed specifically for travel agencies of all sizes, Travel Trip Hub is an all-in-one platform that simplifies day-to-day operations, allowing you to focus on providing exceptional experiences for your clients.

Why Choose Travel Trip Hub?

Travel Trip Hub offers a comprehensive solution for every aspect of your travel business. Whether it’s managing client inquiries, tracking leads, generating invoices, or coordinating with vendors, the platform provides tools that save time, reduce errors, and improve efficiency.

Key Features

Lead Tracking & Conversion

Capture, nurture, and convert leads into loyal customers effortlessly. With Travel Trip Hub, you can track inquiries, follow up with leads at the right time, and turn opportunities into bookings.
Client Management

Build long-lasting relationships by organizing detailed client profiles, including preferences, booking history, and communication logs.
Invoice Management

Simplify financial operations with easy-to-generate invoices, payment tracking, and reminders—all in one place.
Booking & Ticketing

Streamline the booking process with tools that make ticket issuance and itinerary management seamless and efficient.
Vendor Coordination

Maintain smooth collaboration with vendors and service providers by tracking payments and ensuring timely communication.
Reports & Insights

Make informed decisions with detailed reports on sales, bookings, and client behavior. Gain the insights you need to drive growth.

Who Is Travel Trip Hub For?

Small Travel Agencies: Simplify your operations with tools that save time and improve accuracy.
Large-Scale Agencies: Manage multiple clients, leads, and vendors effortlessly, all from a centralized platform.
Freelance Travel Agents: Stay organized and deliver professional service with features that support every aspect of your business.

Benefits of Using Travel Trip Hub

Time-Saving Tools: Automate repetitive tasks like follow-ups and invoicing.
Improved Accuracy: Reduce errors in booking, client communication, and financial tracking.
Enhanced Client Experience: Personalize services with detailed client insights and organized data.
Business Growth: Leverage analytics and reporting to identify trends and opportunities for scaling your agency.

Ready to Transform Your Travel Business?

With Travel Trip Hub, you have everything you need to manage your travel agency efficiently and effectively. From lead tracking to invoice generation, our platform is built to empower travel professionals like you.

Visit Travel Trip Hub today to learn more and take the first step toward streamlining your travel business.

Frontdesk/Visitor Management System project

Md Sazzadul islam — Tue, 04 Jun 2024 11:45:29 +0000

Introduction

A front desk / visitor management system is an essential aspect of any business. It serves as the first point of contact for customers, potentially making or breaking their experience. Our Welcome - Frontdesk/Visitor Management System is designed to handle all customer inquiries and requests, track them effectively, and automate parts of the process. It also provides information about the company’s services and products, saving time and money while enhancing customer service.

Key Features

Here are some of the main features that make this system stand out:

Welcome Visitor Records: Efficiently manage visitor information.
Capture Visitor Images: Keep a visual record of your visitors.
Connect and Sync with Active Directory (AD): Seamless integration with your existing directory.
Web-based Front Desk: Convenient check-in/out process for visitors.
Visitor Analytics Dashboard: Gain insights into visitor data.
Daily Visitor List: Keep track of daily visitors.
Non-Checked-Out Visitor List: Manage visitors who haven't checked out.
Unlimited Accounts: Create as many accounts as needed.
User Role and Permission System: Define roles and permissions for better control.
Responsive Interface: Accessible on desktop, tablet, and mobile devices.
Cloud and Self-Hosted Solutions: Flexibility to choose your hosting option.

Requirements

Before you start, ensure your environment meets the following requirements:

PHP version ^8.1
MySQL 5.x or higher
Nginx or Apache
LDAP Extension (if using Active Directory)

Installation

Follow these steps to get the project up and running:

Step 1: Clone the Repository

git clone https://github.com/md-sazzadul-islam/front-desk-visitor-management.git
cd front-desk-visitor-management

Step 2: Install Dependencies

composer install

Step 3: Configure Environment

Copy the example environment file and generate the application key:

cp .env.example .env
php artisan key:generate

Step 4: Edit the `.env` File

Configure your database and other settings in the .env file.

Step 5: Import SQL

Import the SQL file to set up the database schema:

File: sql/welcome.sql

Step 6: Serve the Application

Start the development server:

php artisan serve

Configuration

LDAP Configuration

Ensure your .env file contains the following LDAP configurations:

LDAP_HOSTS=mail.example.com
LDAP_PORT=389
LDAP_USERNAME=welcome@example.com
LDAP_PASSWORD=password
LDAP_BASE_DN="dc=example,dc=com"

Mail Configuration

Configure your mail settings in the .env file:

MAIL_MAILER=smtp
MAIL_HOST=smtp.mailtrap.io
MAIL_PORT=2525
MAIL_USERNAME=f0958845bdc3a0
MAIL_PASSWORD=0256d421515e5d
MAIL_ENCRYPTION=tls

Demo Login Info

Use the following demo accounts to log in:

Admin

Username: admin@sazzadul.com
Password: 12345678

User

Username: user@sazzadul.com
Password: 12345678

Contributing

Contributions are what make the open-source community such an amazing place to learn, inspire, and create. Any contributions you make are greatly appreciated. Check out the GitHub repository to get started.

Contact

For any questions or support, feel free to reach out:

Md Sazzadul Islam - https://sazzadul.com

For more details, visit the project documentation.

Let's build a better visitor management experience together!

Dynamic Report Generation in Laravel: Introducing `laravel-dynamic-report-generator`

Md Sazzadul islam — Sat, 01 Jun 2024 18:26:04 +0000

Are you looking for a way to dynamically generate reports in your Laravel application? Look no further! Today, I’m excited to introduce laravel-dynamic-report-generator, a package that allows you to create dynamic reports with drag-and-drop functionality for selecting table columns and joining multiple tables. Let's dive in and see how you can easily integrate this into your Laravel project.

Features

Drag and drop table columns
Join multiple tables
Generate dynamic SQL queries
View and paginate query results

Installation

To get started with laravel-dynamic-report-generator, follow these steps:

Install the package via Composer:

composer require devforest/laravel-dynamic-report-generator

Publish the configuration file and assets:

php artisan vendor:publish --provider="DevForest\ReportGeneratorServiceProvider"

Run the migrations:
```
php artisan migrate
```

Add the service provider to config/app.php (if not using package discovery):

'providers' => [
    // Other service providers...
    DevForest\\ReportGeneratorServiceProvider::class,
],

Usage

Now that you have the package installed, let's walk through how to use it to generate reports.

Navigate to the Report Generator:
Open your browser and go to /report-generator in your Laravel application.
Select Tables and Columns:
- Drag and drop tables from the list to the workspace.
- Drag and drop columns from the selected tables to include them in the report.
Generate the Query:
Once you've selected the necessary columns and joins, generate the query. Review and edit the query if needed before executing it.
Execute the Query:
Click the "Execute" button to run the query and view the results. The results will be displayed in a paginated table.

Conclusion

With laravel-dynamic-report-generator, creating dynamic reports in Laravel has never been easier. Whether you need to generate reports for data analysis, exporting, or just viewing complex data sets, this package has you covered. Install it today and take your Laravel application to the next level!

For more details, check out the GitHub repository and the documentation.

Feel free to modify the content according to your needs and include any additional information or features that might be relevant to your users. Happy coding!

Introducing the Passport Management System - A Comprehensive Solution for Passport Management

Md Sazzadul islam — Sat, 01 Jun 2024 18:13:06 +0000

Hello Dev.to community!

I'm thrilled to introduce you to my latest project - the Passport Management System! This Laravel-based application is designed to simplify and streamline the management of passports, medical statuses, payments, and more.

🚀 Features

User Authentication

Secure login and registration powered by Laravel Passport.

Passport Management

Create, update, and manage passport records with ease.

Medical Status Tracking

Track medical statuses and reports for passport holders.

Payments

Manage payments efficiently and generate detailed payment reports.

Roles and Permissions

Utilize fine-grained access control with Spatie Laravel Permission.

Settings Management

Easily configure system settings from a user-friendly interface.

🛠️ Getting Started

Prerequisites

PHP ^8.0.2
Composer

Installation Steps

Clone the repository:

   git clone https://github.com/md-sazzadul-islam/passport-management-system.git

Install dependencies:

   composer install

Copy .env.example to .env and configure your environment variables.
Generate the application key:

   php artisan key:generate

Create storage link:

   php artisan storage:link

Import SQL:

   File: passport.sql

Start the development server:

   php artisan serve

📖 Documentation

For more detailed documentation, please visit the GitHub Wiki.

🤝 Contribution

I welcome contributions from the community! Whether it's fixing bugs, adding new features, or improving documentation, your help is greatly appreciated. Here's how you can contribute:

📝 Feedback

Your feedback is invaluable! If you have any suggestions, feature requests, or encounter any issues, please open an issue on GitHub or leave a comment below.

Thank you for checking out the Passport Management System. I hope you find it useful for your projects. Happy coding!

Feel free to customize this post further to match your style or to add more details about the project.

DEV Community: Md Sazzadul islam

How I Built a WiFi Motion Detection App Using RSSI in Flutter

SenseWave: WiFi Motion Detector

What Is RSSI?

Received Signal Strength Indicator

What My App Can Detect

1. Presence Detection

2. Motion Detection

3. Approximate Position Heatmap

4. Breathing Detection (Experimental)

5. Sleep Monitoring

6. Walking Pattern Recognition

Signal Processing

Why This Technology Is Interesting

Final Thoughts

Follow My Project

App:

Travel Trip Hub: Your Complete Travel Agency Solution

Travel Trip Hub: Your Complete Travel Agency Solution

Why Choose Travel Trip Hub?

Key Features

Who Is Travel Trip Hub For?

Benefits of Using Travel Trip Hub

Ready to Transform Your Travel Business?

Frontdesk/Visitor Management System project

Introduction

Key Features

Requirements

Installation

Step 1: Clone the Repository

Step 2: Install Dependencies

Step 3: Configure Environment

Step 4: Edit the .env File

Step 5: Import SQL

Step 6: Serve the Application

Configuration

LDAP Configuration

Mail Configuration

Demo Login Info

Admin

User

Contributing

Contact

Dynamic Report Generation in Laravel: Introducing `laravel-dynamic-report-generator`

Features

Installation

Usage

Conclusion

Introducing the Passport Management System - A Comprehensive Solution for Passport Management

🚀 Features

User Authentication

Passport Management

Medical Status Tracking

Payments

Roles and Permissions

Settings Management

🛠️ Getting Started

Prerequisites

Installation Steps

📖 Documentation

🤝 Contribution

📝 Feedback

Step 4: Edit the `.env` File