Adding a '3' command for blinky time

arduino/LEDSwitch/LEDSwitch.ino

@@ -1,6 +1,26 @@
 const unsigned int LED_PIN = 13;
 const unsigned int BAUD_RATE = 9600;
 
+void ledOn() {
+  digitalWrite(LED_PIN, HIGH);
+  Serial.println("LED on");
+}
+
+void ledOff() {
+  digitalWrite(LED_PIN, LOW);
+  Serial.println("LED off");
+}
+
+void ledBlink() {
+  Serial.println("BLINKY TIME");
+  for (int i = 0; i < 5; i++) {
+    ledOn();
+    delay(100);
+    ledOff();
+    delay(100);
+  }
+}
+
 void setup() {
   pinMode(LED_PIN, OUTPUT);
   Serial.begin(BAUD_RATE);
@@ -15,12 +35,13 @@ void loop() {
 
   switch (command) {
   case '1':
-    digitalWrite(LED_PIN, HIGH);
-    Serial.println("LED on");
+    ledOn();
     break;
   case '2':
-    digitalWrite(LED_PIN, LOW);
-    Serial.println("LED off");
+    ledOff();
+    break;
+  case '3':
+    ledBlink();
     break;
   default:
     Serial.print("Unknown command: ");