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