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This is a an economical sound detector.
This module allows you to detect when sound has exceeded a set point you select. Sound is detected via a microphone and fed into an LM393 op amp.The sound level set point is adjusted via an on board potentiometer. When the sound level exceeds the set point, an LED on the module is illuminated and the output is sent low.
VCC : 5 Vdc from your Arduino
Ground : GND from your Arduino
Out : Connect to Digital Input Pin
Power LED : Illuminates when power is applied
Sound Detection LED : Illuminates when sound is detected
Sound Set Point Adjust : CW = More Sensitive
CCW = Less Sensitive