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Controlling an LED with a Sound Sensor & Arduino

Ever wished your lights could respond to your voice or a clap? That’s exactly what this project does!

In this build, we use an Arduino and a sound sensor to control an LED — when the sensor picks up sound above a set threshold, the LED lights up instantly. It’s simple, interactive, and a brilliant entry point into the world of electronics and robotics.

What you’ll need: Arduino Board , Sound Sensor (with built-in mic, op-amp & comparator) ,LED + 220-ohm resistor and Jumper wires

How it works: The microphone captures sound ,the op-amp amplifies it , the comparator checks if it crosses the threshold , Arduino gets the signal ,LED switches ON or OFF. All of this happens in milliseconds!

The wiring is beginner-friendly, the code is minimal, and the result is incredibly satisfying. Whether you’re just starting out or looking for a fun weekend build, this project delivers on all fronts.

 

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