Description M5Stack Microphone Unit (LM393), also known as Unit MIC, is a compact sound sensor module for M5Stack projects. It combines an omnidirectional electret microphone with a MAX4466 microphone preamplifier to help suppress power-supply noise and common-mode noise while providing high-fidelity sound output in noisy environments. The module supports both analog and digital signal output, making it useful for audio sampling, sound-to-electricity conversion, and sound-activated control. The M5Stack Microphone Unit (LM393) also integrates an LM393 dual voltage comparator. By adjusting the onboard 10K potentiometer, users can set the comparison-voltage threshold for digital trigger output while still using the analog signal for waveform or sound-level processing. This makes the M5Stack Microphone Unit (LM393) suitable for prototyping audio interaction, voice switch projects, and compact IoT sound detection systems. Features Sound sampling and audio recording: captures environmental sound for audio input and detection projects. MAX4466 preamplifier: improves microphone signal output and helps reduce power-supply and common-mode noise. Omnidirectional microphone: provides 52dB sensitivity for broad sound pickup around the module. Analog and digital outputs: supports waveform-level processing and threshold-based trigger detection. LM393 threshold control: includes a voltage comparator and adjustable potentiometer for digital trigger tuning. M5Stack development workflow: supports Arduino and UIFlow development with the HY2.0-4P interface. Compact mounting: includes 2 LEGO-compatible holes for quick integration into prototypes and fixtures. Specifications Microphone sensitivity / signal-to-noise ratio 52dB / 40dB Output signal Analog / Digital Input voltage 5V Product size 32.0 x 24.0 x 8.0mm Product weight 4.6g Package size 138.0 x 93.0 x 9.0mm Gross weight 10.0g Applications Sound-to-electricity conversion experiments Sound-activated switches and trigger input Audio sampling and sound-level detection Interactive installations and responsive prototypes Smart home or IoT sound monitoring projects Product List 1 Unit MIC 1 HY2.0-4P Grove cable (20cm) Other Content PinMap HY2.0-4P wire color Black Red Yellow White PORT.B function GND 5V Digital Output Analog Output The M5Stack Microphone Unit (LM393) is designed for PORT.B connection and can be used with Arduino or UIFlow examples for microphone AD-value sampling and threshold-based sound detection. Resources M5Stack Unit MIC documentation MAX4466 datasheet LM393 datasheet Unit MIC Arduino example Unit MIC EasyLoader FAQ What is the M5Stack Microphone Unit (LM393) used for? It is used for audio sampling, sound-to-electricity conversion, and sound-activated switch projects where a compact analog and digital sound sensor is needed. What is the difference between the analog and digital outputs? The analog output can be used for sound-level or waveform processing, while the digital output is controlled by the adjustable LM393 threshold circuit. Which development platforms are supported? The module is designed for M5Stack workflows and supports Arduino and UIFlow development through the HY2.0-4P interface.
