arduino sketch to test ADXL3xx Accelerometer and LED

accelerometer_test.ino

// these constants describe the pins. They won't change:
const int xpin = A3;           // x-axis of the accelerometer
const int ypin = A2;           // y-axis
const int zpin = A1;           // z-axis (only on 3-axis models)

const int x_max = 512; 

int ledPin  = 8;	 //pin for led
 
 //setup
 void setup(){
   pinMode(ledPin, OUTPUT);   // set LED on output mode
   
   Serial.begin(9600);		//start serial communication
 }
 
 //loop
 void loop(){

  //read values from x, y, z pins 
  int xVal = analogRead(xpin);
  int yVal = analogRead(ypin);
  int zVal = analogRead(zpin);
   
   //compare values to x_max and trigger LED Blink
   if(xVal > x_max){
     digitalWrite(ledPin, LOW);
     delay(100);
     digitalWrite(ledPin, HIGH);
     delay(100);
   } else{
     digitalWrite(ledPin, LOW);
   }
   
   //print sensor values
   Serial.print(xVal);
   Serial.print("\t");
   Serial.print(yVal);
   Serial.print("\t");
   Serial.print(zVal);
   Serial.println();
   delay(1000);		//wait a second
   
 }