//Describing the purpose and assumptions of the code
//print Hello world and blink LED 

//define constants
#define LED 2

//define global variables

// put your setup code here, to run once:
void setup() {
  Serial.begin(115200);
  Serial.println("Hello, world");
  pinMode(LED, OUTPUT);
}

// put your main code here, to run repeatedly:
void loop() {
  digitalWrite(LED, HIGH);
  delay(500);
  digitalWrite(LED, LOW);
  delay(500);
}