A sound sensor built around the LM393 comparator lets Arduino respond to ambient sounds like clapping, tapping, or music, forming a simple foundation for building sound-reactive lighting or alarm systems.
Components needed
An Arduino Uno board, a sound sensor module fitted with a microphone and a sensitivity-adjustment potentiometer, an LED with a 220-ohm resistor, and connecting wires.
Wiring it up
The module's digital output connects to digital pin 2 on the Arduino, while the LED connects to digital pin 3 through a 220-ohm resistor to protect it.
How it works
The module's built-in microphone picks up ambient sound, and the LM393 comparator checks it against a sensitivity level preset via the on-board potentiometer. When the sound level exceeds this threshold, the module's output sends a HIGH digital signal. The code continuously reads this state — if it's HIGH, the LED lights up immediately, and once the signal returns to LOW after the sound ends, the LED turns off automatically, producing an instant clap-like response for controlling lighting.
You can find sound sensor modules at Juthour Tech.
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