9534 – Sound Sensor/en

Documentation notice: This technical documentation was independently rewritten from an archived supplier source. Check technical details and commands against the product version and manufacturer documentation before use.

Summary

The Waveshare Sound Sensor is built around the LM386 audio amplifier. It provides analog and digital outputs, supports connection to Raspberry Pi Pico, STM32, and Arduino UNO, and covers a frequency range of 50 Hz to 20 kHz.

Related products at JW Tech

Technical overview

Board size: 39.0 mm × 21.0 mm; mounting hole diameter 2.0 mm.
Operating voltage: 3.3 V to 5.5 V (pin description states 3.3 V to 5.3 V).
Outputs: AOUT carries the analog audio signal; DOUT provides the digital threshold output (logic 0/1).
The LM386 has a built-in gain of 20; adding an external resistor and capacitor between pin 1 and pin 8 allows gain adjustment up to 200×.
Two potentiometers: the A pot adjusts the amplification level, while the D pot sets the threshold for the digital output.
Pico wiring: VCC→3.3 V, GND→GND, AOUT→GP26, DOUT→GP22.
STM32 wiring (F103RB example): VCC→3.3 V, GND→GND, AOUT→PA6, DOUT→PA4.
Arduino UNO wiring: VCC→5 V, GND→GND, AOUT→A0, DOUT→D2.

Commands and examples – verify before use:

sudo apt-get install p7zip-full
cd ~
sudo wget https://files.waveshare.com/upload/b/bc/Sound-Sensor-code.7z
7z x Sound-Sensor-code.7z -o./Sound-Sensor-code
cd ~/Sound-Sensor-code
cd Pico/c/build/
cd ~/Sound-Sensor-code/Pico/c/
cmake ..
make -j9
cp main.uf2 /media/pi/RPI-RP2/

Notes and version constraints

The source gives conflicting operating-voltage ranges: specification says 3.3–5.5 V, pin description says 3.3–5.3 V. Confirm which limit applies before powering the board.
Provided sample firmware files (e.g., rp2-pico-20210418-v1.15.uf2) are version-specific; other Pico firmware versions may require recompiling or adaptation.
The STM32 examples use the HAL library and a Keil project for the F103RB; other STM32 boards need custom porting.
The Arduino examples target the UNO; compatibility with other Arduino models must be verified separately.
The module does not measure decibel levels; ADC values from the microcontroller do not directly represent sound intensity.

Source and revision record

Sound Sensor - Waveshare Wiki
Source revision: 80552
Captured: 2026-08-29T09:45:58+00:00
SHA-256: c60fa33b73888eeab1d3e9fb1d533b54593f15541b536daaed058017ef687878