void setup() {
  pinMode(13, OUTPUT); //led pin
  pinMode(2, INPUT); // push button pin
  Serial.begin(9600);
}
int val=0 ; 
// initial value to compare any button push
 void loop() {
  val = digitalRead(2); 
  //read action on push button
if (val == HIGH)
{
//if high led illuminates
delay(1000);
 digitalWrite( 13 , HIGH);
} 
else  //to dim the led
{
  delay(1000);
  digitalWrite(13, LOW);
} 
}