/*
  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

  created 6 Nov 2008
  by David A. Mellis
  modified 30 Aug 2011
  by Tom Igoe

  This example code is in the public domain.

  http://www.arduino.cc/en/Tutorial/Memsic2125
*/

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

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

void loop() {
  // variables to read the pulse widths:
  int pulseX, pulseY;
  // variables to contain the resulting accelerations
  int accelerationX, accelerationY;

  // 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 1 g.
  accelerationX = ((pulseX / 10) - 500) * 8;
  accelerationY = ((pulseY / 10) - 500) * 8;

  // print the acceleration
  Serial.print(accelerationX);
  // print a tab character:
  Serial.print("\t");
  Serial.print(accelerationY);
  Serial.println();

  delay(100);
}
