java: added java samples

Signed-off-by: Stefan Andritoiu <stefan.andritoiu@intel.com>
Signed-off-by: Mihai Tudor Panu <mihai.tudor.panu@intel.com>

examples/java/MQ303ASample.java

@@ -0,0 +1,62 @@
+/*
+ * Author: Stefan Andritoiu <stefan.andritoiu@intel.com>
+ * Copyright (c) 2015 Intel Corporation.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+public class MQ303ASample{
+
+	static {
+		try {
+			System.loadLibrary("javaupm_mq303a");
+		}catch (UnsatisfiedLinkError e) {
+			System.err.println("error in loading native library");
+			System.exit(-1);
+		}
+	}
+	
+	public static void main(String[] args) throws InterruptedException {
+		// Instantiate an mq303a sensor on analog pin A0
+		 
+		// This device uses a heater powered from an analog I/O pin.·
+		// If using A0 as the data pin, then you need to use A1, as the heater
+		// pin (if using a grove mq303a).  For A1, we can use the D15 gpio,·
+		// setup as an output, and drive it low to power the heater.
+		upm_mq303a.MQ303A mq303a = new upm_mq303a.MQ303A(1,15);
+		
+		System.out.println("Enabling heater and waiting 2 minutes for warmup.");
+		mq303a.heaterEnable(true);
+		Thread.sleep(120000);
+		
+		System.out.println("This sensor may need to warm until the value drops below about 450.");
+		
+		for(int i = 1 ; i < 10 ; i++){
+			int val = mq303a.value();
+			System.out.println("Alcohol detected (higher means stronger alcohol): " + val);
+			
+			Thread.sleep(1000);
+		}
+		
+		mq303a.heaterEnable(false);
+		System.out.println("Exiting");
+	}
+
+}