Clap-Light-Switch
👏 Clap-Activated Light Control System 💡
This project demonstrates a basic sound-based automation system using an Arduino Uno and a relay module to control an AC bulb via clap detection. The system uses a sound sensor module to register audio spikes (like a clap) and toggles the relay accordingly. It serves as a simple prototype for noise-activated smart control applications in home automation.
📘 Objective
The objective of this project is to design a low-cost, embedded system that can detect a clap sound and use it to control high-voltage electrical loads, demonstrating the principles of sensor-based switching, signal processing, and relay interfacing in embedded systems.
🧰 Components
| No. | Component | Quantity | Description |
|---|---|---|---|
| 1 | Arduino Uno | 1 | Main microcontroller for signal processing |
| 2 | Sound Sensor (KY-038 / LM393) | 1 | Detects audio signals like claps |
| 3 | Relay Module (5V) | 1 | Switches an AC bulb via Arduino signal |
| 4 | AC Bulb + Holder | 1 | Load to demonstrate switching |
| 5 | Breadboard + Jumper Wires | Several | For prototyping and connections |
| 6 | LED + 220Ω Resistor (Optional) | 1 | Used for testing without AC load |
| 7 | USB Cable | 1 | For Arduino programming |
⚙️ Working Principle
- The sound sensor continuously monitors environmental noise.
- When a clap is detected (sharp sound spike), it sends a digital HIGH signal to Arduino.
- The Arduino toggles the relay state, switching the connected AC bulb ON or OFF.
- The system can also be tested safely using an LED instead of an AC load.
🔬 Technical Learning Outcomes
- Interfacing sound sensors with Arduino
- Relay control for switching high-voltage devices
- Use of debounce logic for clean input detection
- Prototyping basic automation systems using microcontrollers
🛠 Future Enhancements
- Add clap pattern recognition (e.g., double or triple clap)
- Introduce a timer circuit for auto-off function
- Add Bluetooth/Wi-Fi module for remote override
- Use optocouplers for improved isolation and safety
🖼️ Circuit Diagram
Replace the image below with your circuit diagram.
⚠️ Safety Notice
This project includes an AC load. When working with relays and 220V:
- Ensure proper insulation and terminal protection
- Avoid handling live wires directly
- Use safety gloves and isolate circuits before uploading new code
👨💻 Author
Aliyan Hassan
Electrical Engineering Department
GIFT University, Gujranwala, Pakistan
GitHub: @aliyan-hassan
Email: aliyank7171@gmail.com