/*
  EEL-5666 Example 2: Use of Digital Output Pins
  Turn on/off External LEDs connected to Pins 11 & 12 
  alternatively and the internal LED on Pin 13 on/off.
  Add a delay in each state of 1/2 sec. Use serial input
  to control the LEDs. {i,o} for internal LED {j,k} for
  external LEDs.
  Arroyo January 18, 2016
*/

int extLED1 = 11;   // External LED connected to digital pin 11
int extLED2 = 12;   // External LED connected to digital pin 12
int intLED  = 13;   // Internal LED connected to digital pin 13

void setup( ) {
  pinMode(extLED1, OUTPUT);    // sets digital pin 12 as output
  pinMode(extLED2, OUTPUT);    // sets digital pin 12 as output
  pinMode(intLED,  OUTPUT);    // sets digital pin 13 as output
  Serial.begin(57600);        // connect to the serial port
  Serial.println("Arduino Serial External LEDs");}

  int rcvData=0, count=0;

void loop( ) {
  if (count < 1) {
    for (int j=0; j<5; j++){
      Serial.print("j= ");
      Serial.println(j);
      digitalWrite(13, HIGH);   // set the internal LED on
      digitalWrite(12, LOW);    // set the external LED1 off
      digitalWrite(11, HIGH);   // set the external LED2 on
      delay(500);               // wait for a 1/2 second
      digitalWrite(13, LOW);    // set the internal LED off
      digitalWrite(12, HIGH);   // set the external LED on
      digitalWrite(11, LOW);    // set the external LED off
      delay(500);               // wait for a 1/2 second
    }
    digitalWrite(13, HIGH);   // set the internal LED  on
    digitalWrite(12, HIGH);   // set the external LED1 on
    digitalWrite(11, HIGH);   // set the external LED2 on
  }
  count=1; 
  // blink data only when you receive data:
  if (Serial.available() > 0) {
  // read the incoming byte:
     rcvData = Serial.read();
  // say what you got:
     Serial.print("I received: ");
     Serial.write(rcvData);
     Serial.println();
     if (rcvData == 'i') digitalWrite(13, HIGH);      // internal LED on
     else if (rcvData == 'o') digitalWrite(13, LOW);  // internal LED off
     else if (rcvData == 'j') {digitalWrite(12,LOW); digitalWrite(11,HIGH);}
     else if (rcvData == 'k') {digitalWrite(12,HIGH); digitalWrite(11,LOW);}
     }
}