Datasheet

2
1. Introduction
The Grove - Loudness Sensor is designed to detect the loudness of environmental sound. Based on amplifier
LM2904 and a built-in microphone, it amplifies and filters the high frequency signal that received from the
microphone, and outputs a positive envelop. This will make for Arduino’s signal acquisition. The output
value depends on the level of sound input. In order to avoid unnecessary signal disturbances, input signal
will go through two times’ filtering inside the module. Lastly, there is a screw potentiometer that enables
manual adjustments to the output gain.