KY-037 Datasheet – Sound Sensor Module with Arduino

Part Number : KY-037, KY037

Function : Microphone sensor module (high sensitivity)

Package : Module Type

Manufactures : JOY-IT

Images :

KY-037 datasheet Microphone sensor


The sensor has 3 main components on its circuit board. First, the sensor unit at the front of the module which measures the area physically and sends an analog signal to the second unit, the amplifier. The amplifier amplifies the signal, according to the resistant value of the potentiometer, and sends the signal to the analog output of the module.

The third component is a comparator which switches the digital out and the LED if the signal falls under a specific value. You can control the sensitivity by adjusting the potentiometer

This sensor doesn’t show absolute values (like exact temperature in °C or magneticfield strenght in mT). It is a relative measurement: you define an extreme value to a given normal environment situation and a signal will be send if the measurement exceeds the extreme value. It is perfect for temperature control (KY-028), proximity switch (KY-024, KY-025, KY-036), detecting alarms (KY-037, KY-038) or rotary encoder (KY-026).

Technical data / Short description

1. Digital Out : You can use a potentiometer to configure an extreme value for the sonic. If the value exceeds the extreme value, it will send a signal via digital out.
2. Analog Out : Direct microphone signal as voltage value
3. LED1 : Shows that the sensor is supplied with voltage
4. LED2 : Shows that a magnetic field was detected


KY-037 Datasheet

KY-037 pdf





Unidirectional Microphones vs Omnidirectional Microphones

What are Unidirectional Microphones?

Unidirectional Microphones are microphones that only pick up sound with high gain from a specific side or direction of the microphone. Thus, if a user is speaking into a unidirectional microphone, he must speak into correct side, normally called the voice side, of the microphone in order to get good gain on the recording.

Unidirectional Microphones

What are Omnidirectional Microphones?

Omnidirectional microphones are microphones that pick up sound with equal gain from all sides or directions of the microphone. This means that whether a user speaks into the microphone from the front, back, left or right side, the microphone will record the signals all with equal gain

Omnidirectional Microphones

Most microphones today use electromagnetic induction (dynamic microphones), capacitance change (condenser microphones) or piezoelectricity (piezoelectric microphones) to produce an electrical signal from air pressure variations. Microphones typically need to be connected to a preamplifier before the signal can be amplified with an audio power amplifier and a speaker or recorded.

Microphone Polar Patterns Compared

microphone patterns