int button = 15;
int button_value;
int count = 0;

int led = 5;


void setup() {
  pinMode(led, OUTPUT);
  pinMode(button, INPUT);
}

void loop() {

button_value  = digitalRead(button);

if(button_value == HIGH){
  count++;
  delay(300);
} 
if(count == 1){
  digitalWrite(led, HIGH);
}
if(count == 2){
  digitalWrite(led, LOW);
  count = 0;
}
}