#include <Arduino.h>

#define RED_LED 2
void setup() {
  // put your setup code here, to run once:
  pinMode(RED_LED, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(RED_LED, HIGH);
  delay(500);
  digitalWrite(RED_LED, LOW);
  delay(500);
  // String thisString = String(13, HEX);
  // String str1=String(14,HEX);
  // int a = str1.length();

}