KY-037 microphone amplifier module

The KY-037 module is a highly sensitive microphone that detects sounds above a pre-set threshold. This module can be used to detect clicks, pops, steps, lights on, etc. Also, this module can be used in security systems.

The module is designed on the basis of a sensitive sound sensor and comparator LM393YD. With the help of the LM393YD comparator microcircuit, the moment when the sound volume threshold is exceeded is determined. When the sensor membrane vibrates from a sound wave, its capacitance changes, as a result of which the voltage at the output of the sound sensor changes. To transmit data on exceeding the threshold, 2 outputs analog (A0) and digital (D0) are used. When the set threshold value is exceeded, a high level signal appears at the D0 pin.

The sensor threshold setting is performed by a trimming resistor, which is installed next to the comparator. When setting the sensor threshold, you should pay attention to the state of the L2 LED, which lights up when the set sound threshold is exceeded. The presence of power is signaled by the LED L1, which is connected to the power buses.

There are 4 outputs on the module board:

A0: conducts voltage that matches the volume level of ambient noise
G: common wire ("ground")
D0: transmits a logical signal that the volume threshold has been exceeded
+: provides module supply voltage
You can supply power to the sensor from an external power source, the Arduino platform, or other microcontroller devices. The module supply voltage is 5 V.

Module Specifications:

Supply voltage, V 3.3 ... 5
Operating temperature, °C 0 ... +70
Mounting hole size, mm 3
Module dimensions, mm 34 x 16.