examples: moved examples to new c++ subfolder

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

examples/c++/mq303a.cxx

@@ -0,0 +1,78 @@
+/*
+ * Author: Jon Trulson <jtrulson@ics.com>
+ * Copyright (c) 2014 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.
+ */
+
+#include <unistd.h>
+#include <iostream>
+#include <signal.h>
+#include "mq303a.h"
+
+using namespace std;
+
+int shouldRun = true;
+
+void sig_handler(int signo)
+{
+  if (signo == SIGINT)
+    shouldRun = false;
+}
+
+int main ()
+{
+  signal(SIGINT, sig_handler);
+
+//! [Interesting]
+  // 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 = new upm::MQ303A(0, 15);
+  
+  cout << "Enabling heater and waiting 2 minutes for warmup." << endl;
+  mq303a->heaterEnable(true);
+  sleep(120);
+
+  cout << "This sensor may need to warm until the value drops below about 450." 
+       << endl;
+
+  // Print the detected alcohol value every second
+  while (shouldRun)
+    {
+      int val = mq303a->value();
+
+      cout << "Alcohol detected (higher means stronger alcohol): " 
+           << val << endl;
+
+      sleep(1);
+    }
+//! [Interesting]
+
+  cout << "Exiting" << endl;
+  mq303a->heaterEnable(false);
+
+  delete mq303a;
+  return 0;
+}