From 9481259966178701fb363416fa736721ce6f2a38 Mon Sep 17 00:00:00 2001
From: Dan Buch <dan@meatballhat.com>
Date: Sun, 29 Dec 2013 15:12:21 -0500
Subject: [PATCH] LED switch exercise

---
 arduino/LEDSwitch/LEDSwitch.ino | 29 +++++++++++++++++++++++++++++
 arduino/LEDSwitch/Makefile      |  1 +
 2 files changed, 30 insertions(+)
 create mode 100644 arduino/LEDSwitch/LEDSwitch.ino
 create mode 120000 arduino/LEDSwitch/Makefile

diff --git a/arduino/LEDSwitch/LEDSwitch.ino b/arduino/LEDSwitch/LEDSwitch.ino
new file mode 100644
index 0000000..53667d3
--- /dev/null
+++ b/arduino/LEDSwitch/LEDSwitch.ino
@@ -0,0 +1,29 @@
+const unsigned int LED_PIN = 13;
+const unsigned int BAUD_RATE = 9600;
+
+void setup() {
+  pinMode(LED_PIN, OUTPUT);
+  Serial.begin(BAUD_RATE);
+}
+
+void loop() {
+  if (Serial.available() <= 0) {
+    return;
+  }
+
+  int command = Serial.read();
+
+  switch (command) {
+  case '1':
+    digitalWrite(LED_PIN, HIGH);
+    Serial.println("LED on");
+    break;
+  case '2':
+    digitalWrite(LED_PIN, LOW);
+    Serial.println("LED off");
+    break;
+  default:
+    Serial.print("Unknown command: ");
+    Serial.println(command);
+  }
+}
diff --git a/arduino/LEDSwitch/Makefile b/arduino/LEDSwitch/Makefile
new file mode 120000
index 0000000..51c7f30
--- /dev/null
+++ b/arduino/LEDSwitch/Makefile
@@ -0,0 +1 @@
+../arduino.mk
\ No newline at end of file