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Blink a LED by Pressing Button

 const int LED=13;

const int BUTTON=7;

int a;

void setup()

{

  pinMode(LED,OUTPUT);

  pinMode(BUTTON,INPUT);

}

  void loop()

  { 

    a=digitalRead(BUTTON);

    if(a==HIGH)

    {

      digitalWrite(LED,HIGH);

    }

    else

    {

     digitalWrite(LED,LOW); 

    }

    }


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