Arduino + accelerometer

memskit_03.ino

/*
   Memsic2125
   Read the Memsic 2125 two-axis accelerometer.  Converts the
   pulses output by the 2125 into milli-g's (1/1000 of earth's
   gravity) and prints them over the serial connection to the
   computer.

   The circuit:
    * X output of accelerometer to digital pin 2
    * Y output of accelerometer to digital pin 3
    * +V of accelerometer to +5V
    * GND of accelerometer to ground
 
   http://www.arduino.cc/en/Tutorial/Memsic2125
   
   created 6 Nov 2008
   by David A. Mellis
   modified 30 Aug 2011
   by Tom Igoe
   modified April 2013
   by Mark Aiello
   
   This example code is in the public domain.
 */

// these constants won't change:
const int xPin = 2;     // X output of the accelerometer
const int yPin = 3;     // Y output of the accelerometer
const int yPinLED = 5;  // Y LED output 
//const int xPinLED = 6;  // X LED output 

void setup() {
  // initialize serial communications:
  Serial.begin(9600);
  // initialize the pins connected to the accelerometer
  // as inputs:
  pinMode(xPin, INPUT);
  pinMode(yPin, INPUT);
  pinMode(yPinLED, OUTPUT);   // sets pin as output
  //pinMode(xPinLED, OUTPUT);   // sets pin as output
}

void loop() {
  // variables to read the pulse widths:
  int pulseX, pulseY;
  // variables to contain the resulting accelerations
  int accelerX, accelerY;
  int ledY;
  //int ledX;
 
  // read pulse from x- and y-axes:
  pulseX = pulseIn(xPin,HIGH);  
  pulseY = pulseIn(yPin,HIGH);
 
  // convert the pulse width into acceleration
  // accelerationX and accelerationY are in milli-g's:
  // earth's gravity is 1000 milli-g's, or 1g.
  accelerX = ((pulseX / 10) - 500) * 8;
  accelerY = 40+((pulseY / 10) - 500) * 8;
  
  //ledX = map(pulseX, 0, 10000, 0, 255); 
  ledY= map(pulseY, 2000, 5100, 255, 0); 
  //analogWrite(xPinLED, ledX);  
  analogWrite(yPinLED, ledY);  
  //analogWrite(xPinLED, ledX);  

  Serial.print("AX=");
  Serial.print(accelerX);
  Serial.print("\t");
  Serial.print("AY=");
  Serial.print(accelerY);
  Serial.print("\t");
  Serial.print("X=");
  Serial.print(pulseX);
  Serial.print("\t");
  Serial.print("Y=");
  Serial.print(pulseY);
  Serial.print("\t");
  Serial.println();

  delay(100);
}