Sound Sensor Module (LM393, Microphone)

Description

The Sound Sensor Module is a highly versatile and easy-to-use board designed to detect the intensity of ambient sound in its environment. At its core, the module utilizes a sensitive electret condenser microphone combined with an LM393 voltage comparator chip, allowing it to instantly convert acoustic sound waves into a clean digital electrical signal.

Available at Tomson Electronics, this module is perfect for triggering actions based on noise levels. It features an onboard multi-turn potentiometer (preset) that lets you manually adjust the sound detection threshold. When the ambient noise (like a hand clap, a door slamming, or a dog barking) exceeds your set threshold, the sensor's digital output pin drops LOW, signaling your microcontroller to take action.

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Specifications

• Microphone Type: Electret Condenser Microphone
• Comparator Chip: LM393
• Operating Voltage: 3.3V to 5V DC
• Output Type: Digital Output (DO) - outputs LOW when sound threshold is reached
• Sensitivity Adjustment: Built-in potentiometer
• Indicators: Onboard Power LED and Output Status LED
• PCB Dimensions: Approx. 32mm x 17mm

Applications

• Home Automation: Building classic "clap-on, clap-off" smart switches for room lighting or appliances.
• Security Systems: Serving as an intrusion detector by triggering an alarm when the sound of breaking glass or forced entry is detected.
• Interactive Installations: Creating sound-reactive LED light shows, animatronics, or interactive art displays.
• Robotics: Programming autonomous robots to navigate toward or away from loud noise sources.

Frequently Asked Questions (FAQ)

Q: Can this module record voice audio or recognize speech commands?
A: No. This basic sensor is only designed to detect the volume (amplitude) of sound and trigger a digital signal when a specific loudness threshold is crossed. It does not have the processing capability or bandwidth to record actual audio files or recognize words. For voice recognition, you would need an I2S microphone or a dedicated voice recognition module.

Q: How do I tune the sensor to only detect loud claps?
A: Connect the sensor to power (5V and GND). Use a small screwdriver to turn the blue potentiometer. While turning, clap your hands at the volume you want to detect. Adjust the dial until the onboard Output LED only lights up when you clap loudly, ignoring normal background talking.

Q: Can I measure exact Decibel (dB) levels with this?
A: No. The LM393 comparator provides a simple digital ON/OFF signal based on a relative threshold, not calibrated analog data. It cannot provide an accurate numeric decibel reading.

Package Includes

• 1 × Sound Sensor Module (LM393)