KY-037 High Sensitivity Sound Microphone Sensor Module

KY-037 High Sensitivity Sound Microphone Sensor Module is an essential acoustic sensing component for detecting environmental sound levels and converting them into both digital and analog electrical signals. This module integrates a highly sensitive condenser microphone and a voltage comparator, offering two distinct outputs to maximize flexibility in your projects. Consequently, you can easily adapt this module for applications ranging from simple noise detection to complex audio amplitude monitoring. It operates efficiently with microcontrollers like Arduino and Raspberry Pi, making it a foundational tool for creating sound-activated switches, voice-controlled systems, and acoustic warning devices. Furthermore, the onboard potentiometer allows you to precisely tune the digital output’s sensitivity to match your specific environmental noise floor.

Key Features:

• Dual Output Modes: Provides an Analog Output (AO) for real-time sound waveform monitoring and a Digital Output (DO) for threshold detection.
• Adjustable Sensitivity: The integrated high-precision potentiometer allows fine-tuning of the switching threshold for the digital output.
• High Sensitivity Condenser Mic: Features a high-quality electret condenser microphone, enabling the module to capture subtle acoustic variations across a wide frequency range.
• Power Indicator LED: An onboard LED confirms the module is receiving power and operating correctly.
• Switching Indicator LED: A second LED clearly indicates when the digital output (DO) has crossed the set sound threshold, providing visual feedback.

Technical Specifications:

• Operating Voltage (V_CC): 3.3 V to 5 V DC
• Microphone Type: Electret Condenser Microphone (ECM)
• Output Signals: Analog (AO) and Digital (DO)
• Comparator Chip: LM393 (Generally used, offering fast response time)
• Current Consumption: ≈ 4.5 mA (Low power draw for embedded systems)
• Detection Range: Typically 50 Hz to 10 kHz

Mechanical Specifications:

• Module Material: FR-4 PCB with Solder Mask
• Mounting: Two standard mounting holes (Typically 3 mm diameter) facilitate easy attachment to project enclosures.
• Adjustable Component: One 10 kΩ Trimpot (Potentiometer) for sensitivity calibration.

Dimensions:

• PCB Length: ≈ 32 mm
• PCB Width: ≈ 15 mm
• Module Weight: ≈ 4 g (Lightweight for mobile or drone projects)

Pinout and Wiring:

• VCC: Connect the power supply (3.3V or 5V DC) to this pin.
• GND: Connect the circuit ground (0 V).
• DO (Digital Out): Connect this pin to a digital input on your microcontroller. This pin outputs HIGH or LOW based on the sound level exceeding the threshold set by the potentiometer.
• AO (Analog Out): Connect this pin to an analog-to-digital converter (ADC) pin on your microcontroller (e.g., Arduino A0). This pin provides a continuous voltage waveform representing sound amplitude.

Datasheet Reference:

• Download LM393 Comparator Datasheet

Commonly Used in:

• Acoustic Switching Circuits: Building simple clap-on/clap-off light switches or sound-activated relays.
• Security Systems: Incorporating noise detection capabilities into low-cost alarm or monitoring systems.
• Interactive Art Installations: Creating displays or props that respond dynamically to ambient sound.

Applications:

• Voice Recognition Prototypes: Capturing sound for basic frequency and pattern analysis.
• Noise Level Monitoring: Continuously measuring and logging sound intensity data.
• Robot Navigation: Providing rudimentary acoustic awareness for obstacle detection or localization.
• Frequency and Amplitude Analysis: Using the Analog Output to visualize sound waveforms.

Equivalent Models:

• KY-038: A structurally similar module, however, it sometimes features slightly different sensitivity calibration or component placement.
• MAX4466 Module: An alternative microphone module utilizing an operational amplifier for amplification, often preferred when seeking higher gain and less noise.
• FC-04 Sensor: This module is functionally identical and uses the same core circuitry, serving as a direct replacement.

Package Includes:

• 1 x KY-037 High Sensitivity Sound Microphone Sensor Module