SeeedStudio Grove Loudness Sensor


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SKU: 597665
  1. Operating voltage: 3.5-10VDC (nominal 5V )
  2. Working frequency: 50~2000 Hz
  3. Sensitivity: -48 to 66 dB
  4. S/N ratio: >58 dB
  5. Output signal range: 0 – 1023 (Analog signal)
  6. Gain adjustable via screw potentiometer
  7. Wide supply voltage range
  8. Built-in signal filtering


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Select below products to add together

SeeedStudio Grove 4 pin Male Jumper to Grove 4 pin Conversion Cable 20cm(Pack of 5) ₹ 149
SeeedStudio Grove Universal 4 pin 20cm Unbuckled Cable (Pack of 5) ₹ 179

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Category: Sound Sensor
Tags: Sound Sensor, grove loudness sensor, loudness sensor

How loud is too loud? Want to detect? But, detecting sound isn’t as simple as a mic into an input, that’s why we are presenting the Seeed Studio’s Grove – Loudness Sensor for it! With this sensor, you will be able to detect the environmental sound and measure its loudness in terms of intensity.

This sensor is based on amplifier LM2904 and a built-in microphone. Signal conditioning and gain control are important and are incorporated into this Grove Loudness sensor. Using an electret mic and two-stage high-pass filter using an LM2904 OP-AMP, it creates a nice, detectable envelope signal for your Grove project.

This sensor receives the high-frequency signal from the microphone, then amplifies it to a certain extent and then, filters it. And finally, it provides a positive envelope at the output. This will make for Arduino’s signal acquisition. The output value depends on the level of sound input. In order to avoid unnecessary signal disturbances, the input signal will go through two times’ filtering inside the module. This sensor comes with a built-in screw potentiometer that enables manual adjustments to the output gain.

For all Grove users (especially beginners), Seeed Studio provides guidance PDF documents. Please download and read through Preface – Getting Started and Introduction to Grove before using the product. This is a suitable product for not only Grove users but also all electronic enthusiasts. So, why wait? Buy now!


  1. Gain adjustable via screw potentiometer
  2. Wide supply voltage range
  3. Built-in signal filtering
  4. Grove compatible interface
  5. Easy to use

Useful Links:


Package Includes:

1 x Grove – Loudness Sensor

Operating Voltage (VDC)

3.5 ~ 10

Frequency Range

50 Hz – 2000 Hz

Sensitivity (dBm)

-48 to 66

S/N Ratio (dB)

> 58

Length (mm):


Width (mm):


Height (mm):


Mounting hole diameter (mm)


Weight (g):


Shipping Weight 0.005 kg
Shipping Dimensions 6.9 × 4.4 × 1 cm

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User Manual

Grove - Loudness Sensor v0.9b Eagle File

LM2904DR Datasheet

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Country Of Origin: China

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