Sound & Audio Detection Sensor Module with LM393 Comparator for Arduino & Raspberry Pi

Specifications:

• Operating Voltage: 3.3V to 5V DC
  
• Operating Current: 15mA (typical)
  
• Onboard Chipset: LM393 Dual Differential Comparator
  Sensing Element: High-sensitivity electret condenser microphone
  
• Signal Outputs: 1× Analog Output (AO) for real-time voltage tracking, 1× Digital Output (DO) for threshold triggering
  
• Status Indicators: Onboard Power LED (Red) and Signal Output Trigger LED (Green)
  
• Sensitivity Adjustment: Integrated multi-turn potentiometer
  
• Dimensions: 32mm × 17mm × 15mm
  
• Compatible Platforms: Arduino Uno, ESP32, Raspberry Pi Pico, STM32, and standard 5V/3.3V microcontrollers

Unlock New Capabilities

Past Projects
If you've already experimented with basic digital input projects like reading a tactile pushbutton or a magnetic door switch on your Arduino, you already understand how microcontrollers process high and low signal states. This means you possess the baseline wiring and logic fundamentals necessary to integrate real-time acoustic threshold detection into your builds.

Feature Upgrade 
This Sound & Audio Detection Sensor unlocks voice-activated switching, smart home clap-controlled lighting relays, knock-pattern security locks, and basic acoustic event logging. By utilizing the analog output, you can even build visual music visualizers using LED strips or detect mechanical failure thuds in industrial machinery—capabilities that are impossible to achieve with simple digital buttons or contactless optical infrared sensors.

Effort Level & Minimum Hardware

• Arduino Uno or compatible development board — needed to read the digital state changes or process the raw analog voltage spikes from the sensor module.
• USB cable — provides the reliable power delivery link to the microcontroller from your computer and serves as the data pipeline for flashing test code.
• 3× Jumper wires (Female-to-Male) — necessary to route power, ground, and signal lines cleanly from the sensor breakout pins onto the microcontroller board headers.
• Solderless breadboard — allows you to assemble the prototype configuration without applying permanent heat, making circuit adjustments risk-free.

Virtual Technician & Wiring Guide

• Voltage Output Threat: If you power this sensor module using 5V, its Digital Output (DO) and Analog Output (AO) lines will carry 5V logic signals. Connecting these output lines directly to 3.3V microcontrollers (like the ESP32, Raspberry Pi, or STM32) without a proper logic level converter or resistor voltage divider will permanently destroy the sensitive 3.3V GPIO pins.
• Polarity Damage: Double-check that your power supply lines match VCC and GND exactly before powering up the circuit. Reversing the input polarity can easily ruin the onboard LM393 differential comparator chip.
• Electret Mechanical Stress: Avoid squeezing, pressing, or bending the silver electret microphone casing. Deforming the outer metal capsule will alter the alignment of the internal acoustic diaphragm and ruin sensor calibration permanently.

Pin mapping  

Package Includes:

1 x Sound & Audio Detection Sensor Module with LM393 Comparator for Arduino & Raspberry Pi

Frequently Asked Questions

1. Is the Sound & Audio Detection Sensor compatible with Arduino Uno?
   Yes, this sound sensor module is fully compatible with the Arduino Uno because it operates perfectly at 5V and outputs standard TTL digital logic signals that can be read by any digital input pin.
2. Can I use the Sound & Audio Detection Sensor with an ESP32 board?
   Yes, it is compatible with the ESP32, but you must power the module with 3.3V instead of 5V to ensure that the digital output signal matches the 3.3V maximum logic tolerance of the ESP32 GPIO pins.
3. Can I use the Sound & Audio Detection Sensor with MicroPython on a Raspberry Pi Pico?
   Yes, you can read the digital output logic or process the analog output voltage via the Raspberry Pi Pico's analog-to-digital converter (ADC) pins using standard MicroPython machine library methods.
4. Can I run multiple Sound & Audio Detection Sensors on the same Arduino at once?
   Yes, you can operate multiple sound sensors simultaneously by assigning the signal pin of each module to an individual, unique digital input or analog input channel on your Arduino board.
5. What voltage does the Sound & Audio Detection Sensor require? The Sound & Audio Detection Sensor operates within a standard input voltage range of 3.3V to 5V DC, making it highly versatile for both 5V legacy microcontrollers and modern 3.3V boards.
6. Can I power the Sound & Audio Detection Sensor from a 3.3V pin?
   Yes, you can power the sensor module directly from a 3.3V power header, though operating at 3.3V might slightly reduce the absolute dynamic range of the analog output voltage wave compared to a 5V supply.
7. How much current does the Sound & Audio Detection Sensor draw during use?
   The sensor module is highly efficient and typically draws between 10mA and 15mA during standard operation, which is safely below the maximum current thresholds of a standard microcontroller power header.
8. How do I connect the Sound & Audio Detection Sensor to an Arduino Uno?
   Connect the sensor's VCC pin to the Arduino's 5V pin, the GND pin to any available GND pin on the Arduino, and the DO pin to Digital Pin 2 for event-driven interrupt tracking.
9. Which pins do I use to wire the Sound & Audio Detection Sensor to a Raspberry Pi?
   Wire the sensor VCC pin to a physical 3.3V pin (Pin 1 or 17), connect GND to a physical GND pin (such as Pin 6 or 9), and route the DO pin to any available Raspberry Pi GPIO pin like GPIO4.
10. Do I need a resistor or level shifter with the Sound & Audio Detection Sensor?
    No external resistor is required if you power the sensor at the exact logic voltage of your board, but you must use a resistor voltage divider if you power the sensor at 5V while reading it with a 3.3V board.
11. Which Arduino library should I use for the Sound & Audio Detection Sensor?
    No special external library is required to operate this sensor since it can be fully controlled using the built-in Arduino framework commands digitalRead() for digital thresholds and analogRead() for raw voltage waves.
12. Is there a specific MicroPython library for the Sound & Audio Detection Sensor?
    No custom MicroPython driver package is needed because the sensor utilizes standard high/low electrical state tracking, which is natively supported via the machine.Pin and machine.ADC modules.
13. Where can I find example code for the Sound & Audio Detection Sensor with Arduino?
    Basic threshold test code can be found directly by referencing the Arduino Reference Documentation or searching community hubs for simple state-change example sketches.
14. Why is my Sound & Audio Detection Sensor digital output always showing a value of 1?
    An unchanging high digital output usually means the onboard threshold potentiometer is incorrectly adjusted; turn the small brass screw on the potentiometer counterclockwise to reduce sensitivity until the indicator LED turns off.
15. Why are my Sound & Audio Detection Sensor readings inconsistent or jumping?
    Erratic data responses are typically caused by electrical noise in the circuit or a missing common ground link; ensure a stable ground wire joins the sensor module directly to your microcontroller's GND terminal.
16. Why is the Sound & Audio Detection Sensor not being detected by my Arduino?
    Detection failures are almost always caused by loose wire terminations or cold solder joints on the module header pins; verify line continuity using a digital multimeter set to resistance mode.
17. My Sound & Audio Detection Sensor works sometimes but not always—what is wrong?
    Intermittent behavior is often the result of power rail fluctuations under high load; add a 10µF decoupling capacitor across the VCC and GND lines of the sensor module to smooth out random voltage drops.
18. Does Probots sell the Sound & Audio Detection Sensor in bulk for institutional orders?
    Yes, our Bangalore office regularly manages bulk sourcing and institutional volume distribution; contact our logistics team directly via the corporate portal to request a volume quote for volume orders.
19. Is the Sound & Audio Detection Sensor on Probots the genuine version or a clone?
    The sensor module supplied by Probots is a verified standard breakout module sourced through direct, vetted Tier-1 factory supply lines to guarantee reliable, lab-tested performance over cheap unverified marketplace duplicates.
20. Does Probots provide technical support for the Sound & Audio Detection Sensor after purchase?
    Yes, every sensor purchased is fully backed by our local engineering team in Bangalore, providing direct answers to deployment technical challenges and hardware troubleshooting inquiries through our official helpdesk.