High Sensitivity Microphone Sensor
A KY-037 microphone module senses sound level with both an analog output and an adjustable digital threshold output.
Part images
What it is
A KY-037 microphone module senses sound level with both an analog output and an adjustable digital threshold output.
How students use it
Students use it for clap triggers, sound meters, threshold tuning, and analog-versus-digital comparison.
Pins and power
AO analog output, DO digital threshold output, VCC, and GND on common KY-037 boards.
Use module power that keeps AO/DO outputs Pico-safe.
AO follows sound envelope/noise level; DO changes when the onboard comparator threshold is crossed.
Voltage and safety
Never send an output above 3.3V into Pico GPIO or ADC.
Avoid testing with painful sound levels. Protect ears first.
Module internals
Main component: Electret microphone with amplifier/comparator module.
Microphone capsule, LM393-style comparator on many boards, trimmer, indicator LEDs, and header pins.
Datasheet notes
It measures loudness changes, not speech recognition or high-quality audio.
Common libraries
Use machine.ADC for AO and machine.Pin for DO.
Common mistakes
Expecting words/music audio, setting the threshold with no test sound, ignoring room noise, and using 5V outputs directly.