LM393 Sound Sensor

LM393 Sound Detection Sensor Module (Adjustable Digital Output)

The LM393 Sound Detection Sensor Module is a popular and cost-effective solution for adding basic sound-triggered functionality to electronic projects. Designed to detect sound levels that exceed a user-defined threshold, this module is ideal for simple sound-activated systems such as alarms, switches, and interactive projects.

The module combines a high-sensitivity electret condenser microphone with the reliable LM393 voltage comparator IC. The microphone converts sound waves into an analog signal, which is then compared against an adjustable reference level. When the sound intensity crosses the set threshold, the module generates a clean digital signal that can be read directly by microcontrollers such as Arduino, ESP8266, ESP32, and Raspberry Pi.

🔧 Key Features and Functionality

• Comparator IC: Uses the LM393 comparator for stable and reliable sound detection.
• Adjustable Sensitivity: Onboard potentiometer allows precise control of the sound detection threshold.
• Dual Output: Provides Digital Output (D0) for threshold detection and Analog Output (A0) for raw sound signal monitoring.
• Status Indicator: Built-in LED lights up when the sound threshold is exceeded.
• Wide Voltage Support: Operates reliably on 3.3V to 5V DC.
• Event Detection: Designed for sound presence detection, not for measuring sound pressure levels (dB) or frequency analysis.

💡 Typical Applications

• Sound-Activated Switches: Clap-controlled lights or devices.
• Simple Alarm Systems: Trigger alerts when loud noises are detected.
• Interactive Toys & Robotics: Enable sound-responsive behavior.
• Educational Projects: Learn about microphones, comparators, and signal thresholds.

⚙️ Technical Specifications

📦 Package Includes

• 1 × LM393 Sound Sensor Module