const int led_pin = 2;
void setup() {   // put your setup code here, to run once:  pinMode(led_pin,OUTPUT);
}
void loop() {   // put your main code here, to run repeatedly:   digitalWrite(led_pin, HIGH);   delay(1000);   digitalWrite(led_pin, LOW);   delay(500);   digitalWrite(led_pin, HIGH);   delay(1000);   digitalWrite(led_pin, LOW);   delay(500);   digitalWrite(led_pin, HIGH);   delay(1000);   digitalWrite(led_pin, LOW);   delay(500);
  digitalWrite(led_pin, HIGH);   delay(2000);   digitalWrite(led_pin, LOW);   delay(500);   digitalWrite(led_pin, HIGH);   delay(2000);   digitalWrite(led_pin, LOW);   delay(500);   digitalWrite(led_pin, HIGH);   delay(2000);   digitalWrite(led_pin, LOW);   delay(500);
  digitalWrite(led_pin, HIGH);   delay(1000);   digitalWrite(led_pin, LOW);   delay(500);   digitalWrite(led_pin, HIGH);   delay(1000);   digitalWrite(led_pin, LOW);   delay(500);   digitalWrite(led_pin, HIGH);   delay(1000);   digitalWrite(led_pin, LOW);   delay(5000); }