Organizing the arduino things a bit

arduino/msaqsg/ch01/HelloWorld/HelloWorld.ino

@@ -0,0 +1,27 @@
+const unsigned int LED_PIN = 13;
+const unsigned int PAUSE = 700;
+const unsigned int FLASH_DURATION = 100;
+
+
+void flash(int n) {
+  for (int i = 0; i < n; i++) {
+    digitalWrite(LED_PIN, HIGH);
+    delay(FLASH_DURATION);
+    digitalWrite(LED_PIN, LOW);
+    delay(FLASH_DURATION);
+  }
+}
+
+
+void setup() {
+  pinMode(LED_PIN, OUTPUT);
+}
+
+
+void loop() {
+  for (int i = 1; i < 4; i++) {
+    flash(i);
+    delay(PAUSE);
+  }
+  delay(PAUSE);
+}

arduino/msaqsg/ch01/HelloWorld/Makefile

@@ -0,0 +1 @@
+../../../arduino.mk