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Gravity: Analog Sound Sensor

Gravity: Analog Sound Sensor

MPN: DFR0034
DFRobot
HYLD9767 Sound Sensor Gravity Platform Evaluation Expansion Board
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Overview

The DFR0034 is an electret microphone-based sound sensor designed for the Gravity interface ecosystem. It utilizes the HYLD9767 microphone capsule to detect ambient sound levels and output a proportional analog voltage. Operating between 3.3V and 5V, it is specifically designed for easy integration with microcontrollers that feature an Analog-to-Digital Converter (ADC).

Why Choose This Part

The module features a standardized Gravity 3-pin interface which eliminates the need for soldering or complex breadboarding. Its wide input voltage range of 3.3V to 5V ensures compatibility with both low-power ARM Cortex-M devices and standard 5V AVR-based controllers. The small 22x30mm footprint and onboard amplification make it a plug-and-play solution for quick prototyping.

Applications

Voice Operated Switch
Implementing sound-triggered relays or lighting systems where a specific decibel threshold activates an output.
Environmental Noise Monitoring
Collecting ambient sound level data for smart home or industrial workspace safety analysis.
Interactive Robotics
Allowing robots to react to auditory cues such as claps, whistles, or loud impacts.
Audio Visualization
Providing a raw analog signal for MCU-driven LED strips or matrix displays to create reactive light shows.

Key Specifications

Type Sensor
Contents Board(s), Cable(s)
Function Sound
Platform Gravity
Utilized IC / Part HYLD9767

Getting Started

Connect the 3-pin Gravity cable to an analog input pin on an Arduino or compatible microcontroller. Use the standard analogRead() function to sample the sound intensity, keeping in mind that the output will fluctuate based on the audio waveform. For threshold-based triggers, calibrate your software by sampling the ambient noise floor of your specific environment first.