The Sound Sensor sends an electrical signal when it reaches a specific sound threshold. You can increase its sensitivity using a Dimmer. When sensitivity is increased, it can detect quieter sounds.
In "a" mode, the module sends an analog signal and functions as a regulator.
In "b" mode, the module detects the digital signal.
Just as our ears transmit the vibrations of sound waves to our brain through electricity, sound sensors allow the flow of current.
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