ledscan.ino

int LED_PIN = 9;

void setup() {
  // put your setup code here, to run once:
  pinMode(LED_PIN, OUTPUT);
  digitalWrite(LED_PIN, HIGH);
  Serial.begin(9600);
  Serial.println("* * * * * * * * * *");
  Serial.println("*     LED I/O     *");
  Serial.println("*     Program     *");
  Serial.println("*     MA 2018     *");
  Serial.println("* * * * * * * * * * \n");
  Serial.println("(f)lash, (+) on, or (-) off \n");
}

void loop() {
  // put your main code here, to run repeatedly:
  char reading = Serial.read();

  if (reading == '-')
  {
    Serial.println("LED off. \n");
    digitalWrite(LED_PIN, LOW);
  }

  if (reading == '+')
  {
    Serial.println("LED on. \n");
    digitalWrite(LED_PIN, HIGH);
  }

  if (reading == 'f')
  {
    Serial.println("LED flash. \n");
    flash();
    
  }

}

void flash()
{

  for (int i = 0; i <= 5; i++)
  {
     digitalWrite(LED_PIN, HIGH);
     delay(500);
     digitalWrite(LED_PIN, LOW);
     delay(500); 
  }  
}