Adding unreliable switch example

arduino/UnreliableSwitch/Makefile

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

arduino/UnreliableSwitch/UnreliableSwitch.ino

@@ -0,0 +1,21 @@
+const unsigned int BUTTON_PIN = 7;
+const unsigned int LED_PIN = 13;
+
+int ledState = LOW;
+
+void setup() {
+    pinMode(LED_PIN, OUTPUT);
+    pinMode(BUTTON_PIN, INPUT);
+}
+
+void loop() {
+    const int CURRENT_BUTTON_STATE = digitalRead(BUTTON_PIN);
+
+    if (CURRENT_BUTTON_STATE == HIGH) {
+        ledState = HIGH;
+    } else {
+        ledState = LOW;
+    }
+
+    digitalWrite(LED_PIN, ledState);
+}