The Arduino-compatible sound level meter, also known as a decibel meter or noise meter, is a precision instrument designed to measure the sound level of the surrounding environment. Utilizing an instrument circuit and a low noise microphone, it ensures accurate readings, making it suitable for applications such as environmental noise testing, highway noise monitoring, and residential noise monitoring. With the growing concerns about noise pollution and its potential health impacts, this device offers an essential tool for detecting harmful noise levels and safeguarding health. This sound level meter features a plug-and-play design, making it easy to use without the need for soldering. It supports a wide input voltage range from 3.3V to 5.0V and provides a linear analog output from 0.6V to 2.6V, corresponding to sound levels from 30dBA to 130dBA. The linear relationship between the decibel value and the output voltage simplifies the conversion process, eliminating the need for complex algorithms.

The device is particularly useful for DIY enthusiasts and professionals looking to create custom noise monitoring solutions to protect hearing and monitor environmental noise levels.

Features

1. High Precision: Utilizes an instrument circuit and low noise microphone to ensure accurate sound level measurements.
2. Wide Voltage Input: Supports a voltage range of 3.3 to 5.0V, making it versatile for different projects.
3. Simple Conversion: Offers a linear analog output (0.6 to 2.6V) corresponding to 30 to 130 dBA, simplifying the process without requiring complex algorithms.
4. Easy to Use: Designed for plug-and-play functionality, eliminating the need for soldering.

Specifications

• Measuring Range: 30 dBA to 130 dBA
• Measurement Error: ±1.5 dB
• Frequency Weighted: A-weighted
• Frequency Response: 31.5 Hz to 8.5 kHz
• Time Characteristics: 125 ms
• Input Voltage: 3.3 to 5.0V
• Input Current: 22 mA at 3.3V, 14 mA at 5.0V
• Output Voltage: 0.6 to 2.6V
• Module Size: 60 mm x 43 mm

Usage Precautions

• Avoid touching the sensitive black film with fingernails or sharp objects on the microphone.
• Do not place the module on conductive or semiconductor surfaces to prevent shorting the microphone’s pins.
• It is recommended to place the module on a dry insulator or use nylon columns to suspend it in the air.

Documents:

• Product wiki
• Analog Sound Level Meter Layout

Package Includes: