The geeekus Sound Sensor module is designed for measuring sound signals like voice, claps, snaps and knocks in your surroundings. It works through sound vibrations, which cause a plate inside the sensor to bend back and forth, producing a change in voltage that can be measured. Larger vibrations means higher values.
The sound sensor consists of a microphone as a transducer, potentionmeter to adjust the intensity, LM386 low power audio amlifier, LED and other passive components like resistors and capacitors. You can set a threshold value using the potentiometer so that when the amplitude of the sound exceeds the threshold value, the module will output LOW otherwise HIGH.
It works similar to our ears. Our Ears have a diaphragm which converts the detected the vibration and converts it in the signal. Similarly, the sound sensors convert the vibration into audio signal (voltage and current proportional) with the help of a microphone. This microphone has an inbuilt diaphragm, made up of magnets which are coiled by metal wire. Whenever sound waves hits the diaphragm, magnets vibrate and at the same time coil induces the current.
Specifications:
Operating voltage: 3.3V-5V（DC）
Operating current: <10mA
Interface：3PIN
Output signal: Analog
Connection Diagram
Sample Code
int sensorPin =A0 ; // define analog port A0
int value = 0; //set value to 0
void setup() { Serial.begin(9600); //set the baud rate to 9600
} void loop() {
value = analogRead(sensorPin); //set the value as the value read from A0
Serial.println(value, DEC); //print the value and line wrap
delay(200); //delay 0.2S
}
Test Result: upload the code and then open the serial monitor on the right upper corner of Arduino IDE. The analog value will pop up on the monitor window. The greater the sound, the greater the analog value is.
WARNING
