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    Picture of Small Sound Sensor Module, ModbusRTU Protocol Picture of Small Sound Sensor Module, ModbusRTU Protocol Picture of Small Sound Sensor Module, ModbusRTU Protocol Picture of Small Sound Sensor Module, ModbusRTU Protocol

    Small Sound Sensor Module, ModbusRTU Protocol

    1 review(s) | Add your review
    SKU: SUCH-NS-E0211
    $108.46
    ● Compact sound sensor module with RS485 Modbus RTU ● Measurement range: 30~130 dB, frequency range: 31.5Hz~8kHz ● 0.1 dB resolution with ±1.5 dB accuracy ● Suitable for noise monitoring in classrooms, libraries, and workshops
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    🕒 Delivery date: 6-12 days
    🔁 30-day Returns
    Overview

    Small sound sensor module uses an A-weighted measurement method, with a measurement range of 30–130dB and an accuracy of ±1.5dB. It supports Modbus RTU communication protocol and RS485 interface, facilitating integration with various control systems. SUCH noise sensor module features wide voltage input (4.3-25V), multiple selectable response times (100~400ms), and high resolution (0.1dB), enabling it to quickly and accurately reflect changes in ambient noise. With its compact structure (90×16mm), the sound sensor module is suitable for various noise monitoring scenarios such as dormitories, classrooms, libraries, construction sites, and workshops.

    Feature

    • Employs an A-weighted algorithm for sensitive detection of ambient noise changes, with a rapid and stable response.
    • Supports Modbus RTU protocol and RS485 interface, easily integrated into various monitoring systems.
    • Compact size and easy installation, suitable for various scenarios such as dormitories, classrooms, libraries, and construction sites.

    Wiring Instruction

    Sound sensor module wiring diagram

    Specs
    Operating Voltage 4.3-25V
    Operating Current 19.30mA (@5V)
    Interface Type RS485
    Measurement Range 30-130dB
    Frequency Range 31.5Hz-8kHz
    Weighting Method A-weighted
    Resolution 0.1dB
    Accuracy ±1.5dB
    Response Time 100ms, 250ms, 300ms, 400ms
    Protocol Mode Modbus RTU, Active, Passive
    Byte Format Default 115200, 8 data bits, 1 stop bit, no parity
    Baud Rate 9600, 19200, 38400, 57600, 115200
    Operating Temperature -20~60℃
    PCB Size 90×16mm
    Application
    Library

    Library

    Window sound insulation

    Window Sound Insulation

    Construction site

    Construction Site

    FAQ
    ❯

    The module uses an A-weighted algorithm, and the measurement results are consistent with human hearing, meeting the needs of environmental noise monitoring. However, due to differences in structure and calibration methods, there may be a slight error compared to a professional sound level meter. It is suitable for trend monitoring or system integration.

    ❯

    The module itself is an electronic component and requires a waterproof housing or acoustic windproof cover to be used in outdoor or high-humidity environments.

    ❯

    The module is mainly used for sound pressure level detection of environmental noise (such as human voices, mechanical sounds, traffic noise, etc.), without distinguishing between sound sources or types.

    1 review(s)
    5.0 1
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    Grant Pritchard | 10/13/2026 9:24 AM
    Handy sound sensor module for classroom monitoring
    I’m using this sound sensor module to keep track of noise levels in a classroom. I mainly wanted to see how much the noise changes throughout the day. Getting the RS485 connection working took a little trial and error, but I’ve got it talking to the controller now. It’s been useful for checking when the room gets loud, especially during busy periods.
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