how to make clap switch using arduino


Clap switch using Arduino


 In this Arduino project for beginners. The sound made by clapping is detected by an electret microphone connected to one of the Arduino analog input pin.
The first time that the clap is detected by the Arduino, the light will be switch ON. The second time that a clap is detected the light will be switched OFF. this is an easy and fun project for beginners.


Circuit diagram.

https://www.youtube.com/watch?v=CFlzrHVzK8U

Requirements.

Microphone.
100n (104) ceramic capacitor.
100k resistor.
10k resistor.
100 – 1k resistor any one of them.
BC547 NPN Transistor.
12v Relay.
Wire.
Holder.
12v DC Supply.
Jumper wire.
Arduino  (Any Arduino board ).
https://youtu.be/hH07vDR9zn8

Arduino code.

After building the above circuit, load the following sketch to the Arduino board.

 Code.

void setup() {

  Serial.begin(9600);             // using serial port to check analog value
  pinMode(2, OUTPUT);             // LED on digital pin 2
}

void loop() {
  int analog_val;                 // analog value read from A2
  static bool led_state = false;  // current state of LED
  
  analog_val = analogRead(A2);

  if (analog_val > 55) {          // trigger threshold, you can change the value as per your requirements, if you decrease the value sensitivity is increased or vice versa, here I used 55 because of I used 12v SMPS so its output, not pure dc means its output mix with ac with 50Hz frequency, so I used 55

    // toggle LED
    if (led_state) {
      led_state = false;          // LED was on, now off
      digitalWrite(2, LOW);
      Serial.println(analog_val); // print analog value for debug purposes
    }
    else {
      led_state = true;
      digitalWrite(2, HIGH);      // LED was off, now on
      Serial.println(analog_val);
    }
    delay(50);  // wait for clap noise to subside
  }
}



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