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'''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.<br />
<br />
== Summary ==<br />
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.<br />
<br />
== Related products at JW Tech ==<br />
* [https://shop.jw-tech.eu/p/9534 9534 – LM386 Sound Sensor, Sound Detector, Compatible with Arduino]<br />
* [https://shop.jw-tech.eu/p/WSAL9534 WSAL9534 – LM386 Sound Sensor, Sound Detector, Compatible with Arduino]<br />
<br />
== Technical overview ==<br />
* Board size: 39.0 mm × 21.0 mm; mounting hole diameter 2.0 mm.<br />
* Operating voltage: 3.3 V to 5.5 V (pin description states 3.3 V to 5.3 V).<br />
* Outputs: AOUT carries the analog audio signal; DOUT provides the digital threshold output (logic 0/1).<br />
* 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×.<br />
* Two potentiometers: the A pot adjusts the amplification level, while the D pot sets the threshold for the digital output.<br />
* Pico wiring: VCC→3.3 V, GND→GND, AOUT→GP26, DOUT→GP22.<br />
* STM32 wiring (F103RB example): VCC→3.3 V, GND→GND, AOUT→PA6, DOUT→PA4.<br />
* Arduino UNO wiring: VCC→5 V, GND→GND, AOUT→A0, DOUT→D2.<br />
<br />
'''Commands and examples – verify before use:''' <br />
<syntaxhighlight lang="text"><br />
sudo apt-get install p7zip-full<br />
cd ~<br />
sudo wget https://files.waveshare.com/upload/b/bc/Sound-Sensor-code.7z<br />
7z x Sound-Sensor-code.7z -o./Sound-Sensor-code<br />
cd ~/Sound-Sensor-code<br />
cd Pico/c/build/<br />
cd ~/Sound-Sensor-code/Pico/c/<br />
cmake ..<br />
make -j9<br />
cp main.uf2 /media/pi/RPI-RP2/<br />
</syntaxhighlight><br />
<br />
== Notes and version constraints ==<br />
* 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.<br />
* Provided sample firmware files (e.g., rp2-pico-20210418-v1.15.uf2) are version-specific; other Pico firmware versions may require recompiling or adaptation.<br />
* The STM32 examples use the HAL library and a Keil project for the F103RB; other STM32 boards need custom porting.<br />
* The Arduino examples target the UNO; compatibility with other Arduino models must be verified separately.<br />
* The module does not measure decibel levels; ADC values from the microcontroller do not directly represent sound intensity.<br />
<br />
== Source and revision record ==<br />
* [https://www.waveshare.com/wiki/Sound_Sensor Sound Sensor - Waveshare Wiki]<br />
* Source revision: 80552<br />
* Captured: 2026-08-29T09:45:58+00:00<br />
* SHA-256: <code>c60fa33b73888eeab1d3e9fb1d533b54593f15541b536daaed058017ef687878</code></div>JWTechPublisher