Memsic 2125 Accelerometer

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1/*
2
3  Memsic2125
4
5  Read the Memsic 2125 two-axis accelerometer. Converts the pulses output by the
6
7  2125 into milli-g's (1/1000 of Earth's gravity) and prints them over the
8
9  serial connection to the computer.
10
11  The circuit:
12
13    - X output of accelerometer to digital pin 2
14
15    - Y output of accelerometer to digital pin 3
16
17    - +V of accelerometer to +5V
18
19    - GND of accelerometer to ground
20
21  created 6 Nov 2008
22
23  by David A. Mellis
24
25  modified 30 Aug 2011
26
27  by Tom Igoe
28
29  This example code is in the public domain.
30
31  https://www.arduino.cc/en/Tutorial/Memsic2125
32
33*/
34
35// these constants won't change:
36
37const int xPin = 2;     // X output of the accelerometer
38
39const int yPin = 3;     // Y output of the accelerometer
40
41void setup() {
42
43  // initialize serial communications:
44
45  Serial.begin(9600);
46
47  // initialize the pins connected to the accelerometer as inputs:
48
49  pinMode(xPin, INPUT);
50
51  pinMode(yPin, INPUT);
52}
53
54void loop() {
55
56  // variables to read the pulse widths:
57
58  int pulseX, pulseY;
59
60  // variables to contain the resulting accelerations
61
62  int accelerationX, accelerationY;
63
64  // read pulse from x- and y-axes:
65
66  pulseX = pulseIn(xPin, HIGH);
67
68  pulseY = pulseIn(yPin, HIGH);
69
70  // convert the pulse width into acceleration
71
72  // accelerationX and accelerationY are in milli-g's:
73
74  // Earth's gravity is 1000 milli-g's, or 1 g.
75
76  accelerationX = ((pulseX / 10) - 500) * 8;
77
78  accelerationY = ((pulseY / 10) - 500) * 8;
79
80  // print the acceleration
81
82  Serial.print(accelerationX);
83
84  // print a tab character:
85
86  Serial.print("\t");
87
88  Serial.print(accelerationY);
89
90  Serial.println();
91
92  delay(100);
93}