constexpr uint8_t ledPin = 2;
void setup() 
{
  Serial.begin(9600);
  pinMode(ledPin, OUTPUT);
}

void loop() 
{
  int randNum = random(0,10);
  Serial.println(randNum);

  if((randNum % 2) == 0)
    digitalWrite(ledPin, HIGH);
  else 
    digitalWrite(ledPin, LOW);

  delay(1000);
}