SEN0232

Gravity: Analog Sound Level Meter SKU:SEN0232 Introduction Analog Sound Level Meter SKU:SEN0232 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 Num Label Sound Level Meter Description 1 A Analog Signal Output(0.6~2.6V) 2 + Power VCC(3.3~5.0V) 3 - Power GND(0V) Tutorial This tutorial will show you how to use this module to measure the decibel value of surrounding environment. Requirements • Hardware DFRduino UNO (or similar) x 1 Sound Level Meter x1 Gravity 3P Cable (or dupont Line) x 1 • Software Arduino IDE (Version requirements: V1.0.x or V1.8.x), Click to Download Arduino IDE from Arduino® Connection Diagram Sample Code /*************************************************** DFRobot Gravity: Analog Sound Level Meter *************************************************** This sample code is used to test the analog sound level meter. Created 2017-06-26 By Jason GNU Lesser General Public License. See for details. All above must be included in any redistribution ****************************************************/ /***********Notice and Trouble shooting*************** 1. This sample code is tested on Arduino Uno with Arduino IDE 1.0.5 r2. 2. In order to protect the microphone on the board, you should not touch the black membrane on the microphone. Also you should keep it clean. 3. Please do not place this module on the surface of conductor or semicondu ctor. Otherwise, this will cause the microphone pin to be shorted. ****************************************************/ #define SoundSensorPin A1 level meter #define VREF 5.0 //voltage on AREF pin,default:operating voltage void setup() { Serial.begin(115200); } void loop() //this pin read the analog voltage from the sound { float voltageValue,dbValue; voltageValue = analogRead(SoundSensorPin) / 1024.0 * VREF; dbValue = voltageValue * 50.0; //convert voltage to decibel value Serial.print(dbValue,1); Serial.println(" dBA"); delay(125); } Expected Results After uploading the sample code, you can open the serial monitor, and get the decibel value. The test environment is the office.The decibel value is shown as below. Relation between Decibel Value and Voltage Output For this product,the decibel value is linear with the output voltage.When the output voltage is 0.6V, the decibel value should be 30dBA. When the output voltage is 2.6V, the decibel value should be 130dBA. The calibration is done before leaving the factory, so you don't need to calibrate it. So we can get this relation: Decibel Value(dBA) = Output Voltage(V) × 50, as shown below. For any questions, advice or cool ideas to share, please visit the DFRobot Forum. More Documents • Analog Sound Level Meter Layout https://www.dfrobot.com/wiki/index.php/Gravity:_Analog_Sound_Level_Meter_SKU:SEN0232 1-10-18