Arduino Code

-

 #define SENSOR_PIN 2

#define RELAY_PIN 3


int previousValue = HIGH;

int clapCount = 0;

unsigned long previousTime = millis();

bool relayOutPut = HIGH;


void setup() 

{

  pinMode(SENSOR_PIN , INPUT);

  pinMode(RELAY_PIN, OUTPUT);


  //Turn off relay . Relay is LOW level triggered relay

  digitalWrite(RELAY_PIN, HIGH);

}



void loop() 

{

  int currentValue = digitalRead(SENSOR_PIN);

  if (previousValue == HIGH && currentValue == LOW)

  {

    if (clapCount == 1 &&  millis() - previousTime >= 500)

    {

      clapCount = 0;

    }

    

    if (clapCount == 0)

    {

      previousTime = millis();

    }

    clapCount++;


    if (clapCount == 2)

    {

      relayOutPut = !relayOutPut;

      digitalWrite(RELAY_PIN, relayOutPut);

      clapCount = 0;          

    }

    delay(200);    

  }

  previousValue = currentValue;

}

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