📡 Raspberry Pi Wireless Output Control System

A wireless IoT system that lets a mobile app remotely switch Raspberry Pi GPIO outputs ON/OFF in real time.
Perfect for home automation, industrial switching, and smart lab experiments.

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🚀 Overview

The Raspberry Pi Wireless Output Control System enables you to control connected devices (relays, LEDs, motors, etc.) from a mobile app over a Wi‑Fi network or the internet.
The app sends simple ON/OFF commands to a lightweight server running on the Raspberry Pi, which toggles the corresponding GPIO pins instantly.

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🌟 Features

• 📶 Wireless control – no cables, no physical buttons
• ⚡ Instant response – commands take effect in real time
• 📱 Simple mobile interface – intuitive Android app built with Kotlin
• 🔀 Multiple outputs – control several GPIO pins independently
• 📈 Scalable design – easily add more outputs or integrate with larger systems

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🧠 System Architecture

Mobile App (Android/Kotlin) │ │ Wi‑Fi / Internet ▼ Raspberry Pi Server (Python / Node.js) │ │ GPIO library ▼ Physical Devices (Relays, LEDs, Motors …)

1. The mobile app sends a request (e.g., http://<pi-ip>/gpio/17/on).
2. The Raspberry Pi server receives the request.
3. The server uses a GPIO library (RPi.GPIO / gpiozero / onoff) to set the pin HIGH or LOW.
4. Connected devices respond immediately.

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🛠️ Technologies Used

Layer	Technology
Backend Server	Python (Flask / FastAPI) or Node.js (Express)
Mobile App	Kotlin (Android)
Hardware Interface	RPi.GPIO, gpiozero, or WiringPi
Communication	HTTP REST or WebSocket over Wi‑Fi
Platform	Raspberry Pi (any model with GPIO header)

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🔌 Use Cases

• 🏠 Home Automation – control lights, fans, door locks
• 🏭 Industrial Switching – trigger relays for machinery
• 🧪 Smart Labs – remote experiment control
• 📚 IoT Learning – understand wireless embedded systems

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⚙️ Quick Setup Overview

⚠️ Important: The complete setup scripts (server code, Linux configuration, full Kotlin app) are not publicly available in this repository.
The source files shared here demonstrate the core concepts and wiring, but the ready‑to‑deploy package is kept private.
If you’re interested in full implementation details, a live demo, or collaboration, feel free to reach out – don’t be shy!

1. Hardware Preparation

• Set up your Raspberry Pi with Raspbian (or any Linux distribution).
• Connect your devices (relay module, LED, etc.) to the correct GPIO pins.

2. Server Side (Raspberry Pi)

• Write a simple HTTP server (Python Flask example):

  from flask import Flask
  import RPi.GPIO as GPIO
  
  app = Flask(__name__)
  GPIO.setmode(GPIO.BCM)
  GPIO.setup(17, GPIO.OUT)
  
  @app.route('/gpio/17/on')
  def on():
      GPIO.output(17, GPIO.HIGH)
      return "ON"
  
  @app.route('/gpio/17/off')
  def off():
      GPIO.output(17, GPIO.LOW)
      return "OFF"
  
  app.run(host='0.0.0.0', port=5000)
  
  Run the server and ensure it starts on boot (systemd service).

3. Mobile App Build the Android app (Kotlin) with buttons mapped to each GPIO endpoint.

Connect to the same network and enter the Pi’s IP address.

4. Operation Tap a button → command travels over Wi‑Fi → Raspberry Pi reacts → device toggles.

🔒 Security Considerations While this project is designed for simplicity, never expose the Raspberry Pi directly to the internet without proper security:

🔑 Use authentication tokens or API keys

🔒 Prefer local network operation (Wi‑Fi LAN)

🛡️ Use a VPN or secure tunnel (e.g., Tailscale, WireGuard) for remote access

🧱 Implement a firewall and disable unnecessary services

📬 Contact & Collaboration The full project files – including the complete Linux setup scripts, polished Kotlin app, and detailed wiring diagrams – are available upon request. I’m always open to discussing ideas, improvements, or custom implementations.

📧 Reach out via email – mehdimejri15@gmail.com

💬 DM me directly – don’t be shy! I’d love to help.

📄 License This project is open‑source and available under the MIT License.

_{Built with ❤️ and a Raspberry Pi by Mejri Mehdi}