Sound Sensor Module

DESCRIPTION

The Sound Sensor Module detects sound waves and outputs an amplified analog version of the waveform

PACKAGE INCLUDES:

• Sound Sensor Module

KEY FEATURES OF SOUND SENOR MODULE:

• Microphone has frequency range of 50 Hz – 13 kHz
• Output is an amplified analog waveform which is adjustable
• 5V operation

This module incorporates a microphone and an LM386 audio amplifier IC that provides an amplified analog output of the sound waveform.

A potentiometer allows the output amplitude to be adjusted.  Turning the potentiometer CCW increases the output amplitude.

The potentiometer is on the output of the LM386 and forms a voltage divider to adjust the output amplitude so the LM386 does not provide enough current to drive a speaker directly.  The output is intended to drive an analog input of a MCU or other circuit with a fairly high impedance input.

The Vcc specification for the LM386 is 4-12VDC.  If using with a 5V MCU, the module should also be operated at 5V.  The board has a red LED which lights whenever power is applied.

Module Connections

The module has a 3-pin header on the assembly for making connections.

1 x 3 Header 

• OUT = Analog output, typically connects to analog input on MCU
• VCC = 4 – 12VDC (5V typical)
• GND = Ground

OUR EVALUATION RESULTS:

This is a useful module for experimenting with sound or taking an action based on detecting a sound of some magnitude.  It can also be used to buffer and feed the sound waveform into another circuit.

Sensitivity of the microphone is decent. We measured a frequency range of about 50Hz to 13KHz.  The scope capture below shows the analog output when the microphone picked up a 1KHz sound from a tone generator.