Sound Detection Sensor Module (LM393)

Sound Detection Sensor Module (LM393)

Sensors
DET615
Part.No: LM393
€3.75
In Stock
Immediate Dispatch
LM393 Sound Detection Sensor Module — single-channel digital output, 4–6 V operating voltage, compact 3.1×1.6×0.8 cm board. Ideal for Arduino projects that need to detect sound presence without any extra library.

 

The LM393 Sound Detection Sensor Module (MPN: LM393) is a compact digital sound detector built around the popular LM393 dual voltage comparator IC. When the onboard microphone picks up sound above a set threshold, the comparator switches its output LOW and the indicator LED lights up — giving your Arduino or compatible board an instant digital signal with no ADC or special library needed.

Key Features

  • LM393 Comparator Core: Industry-standard dual comparator IC handles the analog-to-digital conversion on-board → frees your microcontroller from threshold logic
  • Single-Channel Digital Output: Output goes LOW when sound is detected → read directly with digitalRead() or attach to an interrupt pin
  • On-board Signal Indicator LED: LED lights up when output is active (LOW) → instant visual feedback during wiring and testing
  • 4 V – 6 V Operating Voltage: Compatible with standard 5 V Arduino power rails → no extra regulator required
  • Compact Form Factor: 3.1 × 1.6 × 0.8 cm → fits easily into enclosures and breadboards

Pinout & Wiring

PINSymbolDescription
1VCCPower supply 4–6 V (connect to Arduino 5 V)
2GNDGround (connect to Arduino GND)
3DODigital Output — LOW when sound detected; connect to any Arduino digital pin

Wiring note: Connect VCC → 5 V, GND → GND, DO → any digital pin (e.g. D2 for interrupt). Use digitalRead() and check for LOW to detect a sound event. The on-board potentiometer (if present) adjusts sensitivity.

Compatibility

  • Arduino UNO / Nano / Mega: Plug-and-play at 5 V — no level shifter needed. Read DO with digitalRead().
  • ESP32 / Raspberry Pi (3.3 V logic): The LM393 IC can operate down to 2 V, but verify the module's VCC requirement (4–6 V) — power VCC from 5 V and use a voltage divider or logic-level shifter on the DO line to protect 3.3 V GPIO pins.

Typical Applications

  • Sound-activated lighting: Clap once to toggle an LED strip or relay — classic maker project with zero extra components.
  • Security & alarm systems: Detect glass breaking or a loud knock and trigger a buzzer or notification.
  • Voice-controlled switches: Use the digital pulse from a clap or knock as a simple on/off trigger in home-automation sketches.
  • Robot audio sensing: Give your Arduino robot a basic sense of hearing to react to its environment.
  • Student & classroom projects: Demonstrate comparator operation and digital I/O in electronics courses without complex code.

Technical Specifications

ParameterValue
InterfaceDigital GPIO (DO pin)
Operating Voltage4 V – 6 V DC
Output Channels1 (Single-channel)
Output Logic (active)LOW (active-low)
IndicatorOn-board LED (lights when output is LOW)
Dimensions3.1 × 1.6 × 0.8 cm
MPNLM393

FAQ

Q: Do I need a special Arduino library for this module?
A: No. The LM393 comparator does all the threshold work on-board. Simply use digitalRead() on the DO pin and check for a LOW state to detect sound.

Q: Why does the output go LOW instead of HIGH when sound is detected?
A: The LM393 has an open-collector output. When a sound crosses the threshold, the comparator pulls the output to GND (LOW) and the indicator LED turns on. Design your sketch to trigger on LOW.

Package Contents: 1 × LM393 Sound Detection Sensor Module

⚠ Note: When using with 3.3 V systems (ESP32, Raspberry Pi), power the module from 5 V but protect the GPIO input with a voltage divider or logic-level shifter on the DO line.
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