1 /*
2  * Author: Stefan Andritoiu <stefan.andritoiu@intel.com>
3  * Copyright (c) 2015 Intel Corporation.
4  *
5  * Permission is hereby granted, free of charge, to any person obtaining
6  * a copy of this software and associated documentation files (the
7  * "Software"), to deal in the Software without restriction, including
8  * without limitation the rights to use, copy, modify, merge, publish,
9  * distribute, sublicense, and/or sell copies of the Software, and to
10  * permit persons to whom the Software is furnished to do so, subject to
11  * the following conditions:
12  *
13  * The above copyright notice and this permission notice shall be
14  * included in all copies or substantial portions of the Software.
15  *
16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
17  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
18  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
19  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
20  * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
21  * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
22  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
23  */
24 
25 //NOT TESTED!!!
26 public class MQ2Sample {
27 	private static final short resolution = 5;
28 
29 	static {
30 		try {
31 			System.loadLibrary("javaupm_gas");
32 		} catch (UnsatisfiedLinkError e) {
33 			System.err.println("error in loading native library");
34 			System.exit(-1);
35 		}
36 	}
37 
main(String[] args)38 	public static void main(String[] args) throws InterruptedException {
39 		// ! [Interesting]
40 		short[] buffer = new short[128];
41 
42 		// Attach gas sensor to A0
43 		upm_gas.MQ2 sensor = new upm_gas.MQ2(0);
44 
45 		upm_gas.thresholdContext ctx = new upm_gas.thresholdContext();
46 		ctx.setAverageReading(0);
47 		ctx.setRunningAverage(0);
48 		ctx.setAveragedOver(2);
49 
50 		while (true) {
51 			int len = sensor.getSampledWindow(2, buffer);
52 
53 			if (len != 0) {
54 				int thresh = sensor.findThreshold(ctx, 30, buffer);
55 				sensor.printGraph(ctx, resolution);
56 				if (thresh != 0) {
57 					System.out.println("---Threshold reached---");
58 				}
59 			}
60 
61 			Thread.sleep(1000);
62 		}
63 		// ! [Interesting]
64 	}
65 }