const int BUTTON = 5;       //Connect button to D5
const int LED1=4;       //Connect LED to D4
int ledState = LOW;           //Default state of LED is low
int previousButtonState;    
int presentButtonState;
void setup()
{
pinMode(BUTTON,INPUT);    //Configure Button as input
pinMode(LED1, OUTPUT);            //Configure LED as output
}
void loop()
{           //Read the button state
  presentButtonState = digitalRead(BUTTON);
   if(presentButtonState==HIGH)  //If Button state is high
  {
 	digitalWrite(LED1, HIGH);  //Turn ON LED
}
  else          //If button state is low
 {
    	digitalWrite(LED1, LOW);  //Turn LOW LED
 }
}