Added example Arduino sketch

Author: ShawnHymel

Firmware/AT42QT1010_Arduino_Example/AT42QT1010_Arduino_Example.ino

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+/*
+ 12-23-2013
+ SparkFun Electronics 2013
+ Shawn Hymel
+
+ This code is public domain but you buy me a beer if you use this 
+ and we meet someday (Beerware license).
+
+ Description:
+
+ This sketch shows how to use the SparkFun AT42QT1010 Breakout
+ Board. If you touch the Capacitive Touch area on the breakout
+ board, the LED attached to the Arduino will light up (in addition
+ to the LED on the AT42QT1010 breakout board).
+ 
+ Simply connect power and ground to the breakout board,
+ and the AT42QT1010 handles all the capacitive touch functions.
+ By default, the board will light up the green LED when the pad
+ is touched. A wire may also be connected from OUT on the
+ breakout board to a digital input pin on an Arduino. This signal
+ is normally LOW but goes HIGH on a touch event. 
+ 
+ The "LED Enable" solder jumper may be de-soldered in order to
+ control the LED directly from the LED pin. This is useful if you
+ want to light up a button that the user needs to push.
+
+ Hardware connections:
+ 
+ Uno Pin    AT42QT1010 Board  Function
+ 
+ +5V        VDD               Power supply
+ GND        GND               Ground
+ 2          OUT               Capacitive touch event output
+ */
+
+// Constants
+const int TOUCH_BUTTON_PIN = 2;  // Input pin for touch events
+const int LED_PIN = 13;          // Pin number for LED
+
+// Global Variables
+int buttonState = 0;             // Variable for reading button
+
+void setup() {
+  
+  // Configure button pin as input 
+  pinMode(TOUCH_BUTTON_PIN, INPUT);
+  
+  // Configure LED pin as output
+  pinMode(LED_PIN, OUTPUT);
+  
+}
+
+void loop() {
+  
+  // Read the state of the capacitive touch board
+  buttonState = digitalRead(TOUCH_BUTTON_PIN);
+  
+  // If a touch event occurs, turn on the LED
+  if (buttonState == HIGH) {
+    digitalWrite(LED_PIN, HIGH);
+  } else {
+    digitalWrite(LED_PIN, LOW);
+  }
+}

Firmware/README.md

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+* AT42QT1010_Arduino_Example - Simple sketch showing how to use the AT42QT1010 to detect a capacitive touch event