  digital input on pin 2 and prints the results to the serial monitor.
  
  The circuit: 
- * Momentary switch attached from pin 2 to ground 
- * Built-in LED on pin 13
+ * Momentary switch attached from pin A3 to ground 
+ * Built-in LED on pin A2
  
  Unlike pinMode(INPUT), there is no pull-down resistor necessary. An internal 
  20K-ohm resistor is pulled to 5V. This configuration causes the input to 

/*
 Input Pullup Serial
 

 
 created 14 March 2012
 by Scott Fitzgerald
 modified 25 May 2016
 by bunnie
 
 http://www.arduino.cc/en/Tutorial/InputPullupSerial
 
