In this section, we will look at a project that we can use in a house to detect noise or the level of sound so that we can detect when a person talks in front of the house. This project consists of a module that has a microphone, similar to the following image:
We need to make a program that can read the analog signal that the module sends to the Arduino board:
const int ledPin = 12; // the number of the LED pin
const int thresholdvalue = 400; //The threshold to turn the led on
void setup() {
pinMode(ledPin, OUTPUT);
Serial.begin(9600);
}
void loop() {
int sensorValue = analogRead(A0); //use A0 to read the electrical signal
Serial.print("Noise detected=");
Serial.println(sensorValue);
delay(100);
if(sensorValue > thresholdvalue)
digitalWrite(ledPin,HIGH);//if the value read from A0 is larger than 400,then light the LED
delay...