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 public class MQ303ASample { 26 27 static { 28 try { 29 System.loadLibrary("javaupm_mq303a"); 30 } catch (UnsatisfiedLinkError e) { 31 System.err.println("error in loading native library"); 32 System.exit(-1); 33 } 34 } 35 main(String[] args)36 public static void main(String[] args) throws InterruptedException { 37 // Instantiate an mq303a sensor on analog pin A0 38 39 // This device uses a heater powered from an analog I/O pin.· 40 // If using A0 as the data pin, then you need to use A1, as the heater 41 // pin (if using a grove mq303a). For A1, we can use the D15 gpio,· 42 // setup as an output, and drive it low to power the heater. 43 upm_mq303a.MQ303A mq303a = new upm_mq303a.MQ303A(1, 15); 44 45 System.out.println("Enabling heater and waiting 2 minutes for warmup."); 46 mq303a.heaterEnable(true); 47 Thread.sleep(120000); 48 49 System.out.println("This sensor may need to warm until the value drops below about 450."); 50 51 for (int i = 1; i < 10; i++) { 52 int val = mq303a.value(); 53 System.out.println("Alcohol detected (higher means stronger alcohol): " + val); 54 55 Thread.sleep(1000); 56 } 57 58 mq303a.heaterEnable(false); 59 System.out.println("Exiting"); 60 } 61 62 }