// Declare a variable "led" and assign it to pin 8
int led = 8;

void setup() 
{
  //Set the led pin as an output
  pinMode(led, OUTPUT);
}

// The LED will be on for a sec, & off for a sec repeatedly
void loop() 
{ 
  // Set the pin to a high state (Apply 5V to pin 8)
  digitalWrite(led, HIGH);
  //Wait for a second
  delay(1000);

  // Set the pin to a low state (Apply 0V to pin 8)
  digitalWrite(led, LOW);
  //Wait for a second
  delay(1000);
}