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1/15/2018 Gravity: Analog Sound Level Meter SKU:SEN0232 - DFRobot Electronic Product Wiki and Tutorial: Arduino and Robot Wiki-DFRobot.com

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Analog Sound Level Meter SKU:SEN0232

Gravity: Analog Sound Level Meter SKU:SEN0232

Contents

1 Introduction

2 Specification

3 Board Overview

4 Tutorial

4.1 Requirements

4.2 Connection Diagram

4.3 Sample Code

4.4 Expected Results

5 Relation between Decibel Value and Voltage Output

6 FAQ

7 More Documents

Introduction

In our environment, there are all kinds of sounds, some of which are noise. With the development

of human civilization, the quiet environments are less and less, but more and more noisy

environments instead. Staying in the noise for long time will have an impact on hearing, which is

bad for health.

Sound level meter (also known as the decibel meter, noise meter) is a basic noise measurement

instrument.We have launched a sound level meter, which is compatible with Arduino, plug-and-

play . It can accurately measure the sound level of the surrounding environment. This product

uses instrument circuit, low noise microphone, which makes it highly precious. It supports

3.3~5.0V wide input voltage, 0.6~2.6V voltage output. The decibel value is linear with the output

voltage, which leads to a simple conversion, without complex algorithm.The connector is plug-and-

play, without welding, so this product can be easily used in your application.

Sound level meter is widely used in environmental noise detection, such as highway noise

monitoring station, room noise monitoring and so on. It’s time for you to DIY a sound level detector

to protect your hearing.

The black film on the microphone is a sensitive

component, do not touch it with fingernails or

other sharp objects.

Do not place this module on the surface of the

conductor or the semiconductor, otherwise it will

short the microphone’s pins. It is recommended

to place this module on a dry insulator’s surface

or secure with nylon columns to hang in the air.

Specification

Measuring Range: 30dBA ~ 130dBA

Measurement Error: ±1.5dB

Frequency Weighted: A Weighted

Frequency Response: 31.5Hz ~ 8.5KHz

Time Characteristics: 125ms

Input Voltage: 3.3 ~ 5.0V

Input Current: 22mA@3.3V, 14mA@5.0V

Output Voltage: 0.6 ~ 2.6V

Module Size: 60mm * 43mm

Board Overview

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Summary of content (4 pages)

PAGE 1
/15/2018 Gravity: Analog Sound Level Meter SKU:SEN0232 - DFRobot Electronic Product Wiki and Tutorial: Arduino and Robot Wiki-DFRobot.com Gravity: Analog Sound Level Meter SKU:SEN0232 Contents 1 2 3 4 Introduction Specification Board Overview Tutorial 4.1 Requirements 4.2 Connection Diagram 4.3 Sample Code 4.4 Expected Results 5 Relation between Decibel Value and Voltage Output 6 FAQ 7 More Documents Introduction In our environment, there are all kinds of sounds, some of which are noise.
PAGE 2
1/15/2018 Gravity: Analog Sound Level Meter SKU:SEN0232 - DFRobot Electronic Product Wiki and Tutorial: Arduino and Robot Wiki-DFRobot.com Num 1 2 3 Label A + - Description Analog Signal Output(0.6~2.6V) Power VCC(3.3~5.0V) Power GND(0V) (/wiki/index.php/File:SoundLevelMeterBoardConnector.png) Sound Level Meter Tutorial This tutorial will show you how to use this module to measure the decibel value of surrounding environment.
PAGE 3
1/15/2018 Gravity: Analog Sound Level Meter SKU:SEN0232 - DFRobot Electronic Product Wiki and Tutorial: Arduino and Robot Wiki-DFRobot.com /*************************************************** DFRobot Gravity: Analog Sound Level Meter *************************************************** This sample code is used to test the analog sound level meter. Created 2017-06-26 By Jason
PAGE 4
1/15/2018 Gravity: Analog Sound Level Meter SKU:SEN0232 - DFRobot Electronic Product Wiki and Tutorial: Arduino and Robot Wiki-DFRobot.com (/wiki/index.php/File:Voltage-db.png) FAQ Q1. Why is the decibel value unstable, and constantly varying? Is this normal? A. The decibel value measured by the sound level meter is the sound level of a short period of time (about hundreds of milliseconds), so the value is a instantaneous value.