Lesson: 10 - How to Use a Relay Module with Arduino | Complete Beginner’s Guide
Hello and Welcome to Electro Nerds Academy! In this video, we’ll learn how to control high-voltage and high-power devices like AC bulbs using an Arduino and a relay module. Since Arduino pins can only handle 5V DC at very low current, we use a relay as an electrically operated switch to safely control larger loads.
What you’ll learn:
✅ What a relay is and how it works ⚡
✅ Relay schematic symbols and types (SPDT, SPST, DPDT)
✅ Relay module circuit diagram explained
✅ Relay specifications and markings (coil voltage, contact ratings, datasheets)
✅Step-by-step project: controlling an AC bulb with Arduino using serial monitor commands
⚠️ Safety Note: We’ll be working with mains AC voltage, so please be careful when replicating this project. And we are not responsible for any harm caused.
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