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      1 /*
      2  * Author: Stefan Andritoiu <stefan.andritoiu (at) 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 public class MQ5Sample {
     26 	private static final short resolution = 7;
     27 
     28 	static {
     29 		try {
     30 			System.loadLibrary("javaupm_gas");
     31 		} catch (UnsatisfiedLinkError e) {
     32 			System.err.println("error in loading native library");
     33 			System.exit(-1);
     34 		}
     35 	}
     36 
     37 	public static void main(String[] args) throws InterruptedException {
     38 		// ! [Interesting]
     39 		short[] buffer = new short[128];
     40 
     41 		// Attach gas sensor to A0
     42 		upm_gas.MQ5 sensor = new upm_gas.MQ5(0);
     43 
     44 		upm_gas.thresholdContext ctx = new upm_gas.thresholdContext();
     45 		ctx.setAverageReading(0);
     46 		ctx.setRunningAverage(0);
     47 		ctx.setAveragedOver(2);
     48 
     49 		while (true) {
     50 			int len = sensor.getSampledWindow(2, buffer);
     51 
     52 			if (len != 0) {
     53 				int thresh = sensor.findThreshold(ctx, 30, buffer);
     54 				sensor.printGraph(ctx, resolution);
     55 				if (thresh != 0) {
     56 					System.out.println("---Threshold reached---");
     57 				}
     58 			}
     59 
     60 			Thread.sleep(1000);
     61 		}
     62 		// ! [Interesting]
     63 	}
     64 }