![TFW-G-0045](https://akadako.com/grove/assets/TFW-G-0045/picture.png)
Description
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 is received from the microphone and outputs a positive envelope.
![](https://akadako.com/grove/assets/TFW-G-0045/program_en.png)
Program:https://akadako.com/grove/assets/TFW-G-0045/program.sb3
How to use SB3 file
After downloading sample SB3 file on this page, go to Xcratch or Stretch3. Click on "Load from your computer" and select the file you downloaded to open it. After opening the file, connect AkaDako to your PC and check the operation of the sensors and actuators.
![How to use sb3 file](https://akadako.com/wp-content/themes/akadako/img/how-to-sb3_en.png)