Arduino Uno Relay Light Switch Kit — Build a Button-Controlled Lamp and Learn How Relays Work

Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.

Imagine pressing a simple tactile button and watching a table lamp turn on — not because it’s plugged directly into the Arduino, but because a tiny electromagnet inside the relay has closed a high-voltage circuit safely. That’s exactly what you’ll build and understand with this kit. You’ll go beyond blinking LEDs and into real-world automation, where microcontrollers command appliances through relays.

What You'll Build

You'll wire an Arduino Uno to a 5V relay module, a tactile button, and a breadboard with indicator LEDs. Press the button and the relay clicks — a satisfying sound that means the internal switch has connected the lamp to mains power (through the relay’s output terminals). You’ll see the LED indicator confirm the relay state. This is the same principle used in smart home switches and industrial controllers.

What You'll Learn

• How a relay uses an electromagnet to physically toggle a switch — the core of electrically controlled switching
• Reading a button input with Arduino’s digital pins and debouncing in code
• Driving a relay module safely with a transistor and flyback diode (built into the module)
• Building a complete project on a breadboard, from wiring to testing with a real appliance

Kit Contents

Why Buy This Kit Instead of Sourcing Parts Separately

Who This Kit Is For

This kit is ideal for school students under CBSE Class 11-12 who are starting with Arduino, whether in ATL Tinkering Labs or at home. B.Tech ECE/EEE freshmen at institutions like VIT, SRM, or NITs will also find it a perfect first hands-on project to understand relays before tackling larger automation tasks. Even young innovators preparing for Smart India Hackathon can use this as a foundational module for home automation prototypes.

Built and Backed by Compoden

Every Compoden kit ships with an AI build companion trained on this exact project — accessible via a QR code on the box, with WhatsApp and email backup. We've spent 10 years building projects for makers, schools, and institutions across India. If a part fails because of a manufacturing defect, replace it free within 7 days.