Adding ADXL3xx accelerometer example; minor comment changes.

build/shared/dist/examples/Analog/ADXL3xx/ADXL3xx.pde

@@ -0,0 +1,47 @@
+// ADXL3xx
+// 
+// Reads an Analog Devices ADXL3xx accelerometer and communicates the
+// acceleration to the computer.  The pins used are designed to be easily
+// compatible with the breakout boards from Sparkfun, available from:
+// http://www.sparkfun.com/commerce/categories.php?c=80
+//
+// http://www.arduino.cc/en/Tutorial/ADXL3xx
+
+// Breakout Board Pinout
+// 0: self test
+// 1: z-axis
+// 2: y-axis
+// 3: x-axis
+// 4: ground
+// 5: vcc
+
+int groundpin = 18;             // analog input pin 4
+int powerpin = 19;              // analog input pin 5
+int xpin = 3;                   // x-axis of the accelerometer
+int ypin = 2;                   // y-axis
+int zpin = 1;                   // z-axis (only on 3-axis models)
+
+void setup()
+{
+  Serial.begin(9600);
+  
+  // Provide ground and power by using the analog inputs as normal
+  // digital pins.  This makes it possible to directly connect the
+  // breakout board to the Arduino.  If you use the normal 5V and
+  // GND pins on the Arduino, you can remove these lines.
+  pinMode(groundpin, OUTPUT);
+  pinMode(powerpin, OUTPUT);
+  digitalWrite(groundpin, LOW); 
+  digitalWrite(powerpin, HIGH);
+}
+
+void loop()
+{
+  Serial.print(analogRead(xpin));
+  Serial.print(" ");
+  Serial.print(analogRead(ypin));
+  Serial.print(" ");
+  Serial.print(analogRead(zpin));
+  Serial.println();
+  delay(1000);
+}