mhz16: Initial implementation

This library implements support for the MHZ16 CO2 sensor.

Signed-off-by: Jon Trulson <jtrulson@ics.com>
Signed-off-by: Zion Orent <zorent@ics.com>
Signed-off-by: John Van Drasek <john.r.van.drasek@intel.com>

src/waterlevel/CMakeLists.txt

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+set (libname "waterlevel")
+set (libdescription "upm waterlevel sensor module")
+set (module_src ${libname}.cxx)
+set (module_h ${libname}.h)
+upm_module_init("-lrt")

src/waterlevel/jsupm_waterlevel.i

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+%module jsupm_waterlevel
+%include "../upm.i"
+
+%{
+    #include "waterlevel.h"
+%}
+
+%include "waterlevel.h"

src/waterlevel/pyupm_waterlevel.i

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+%module pyupm_waterlevel
+%include "../upm.i"
+
+%feature("autodoc", "3");
+
+%include "waterlevel.h"
+%{
+    #include "waterlevel.h"
+%}

src/waterlevel/waterlevel.cxx

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+/*
+ * Author: Zion Orent <sorent@ics.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.
+ */
+
+#include "waterlevel.h"
+
+using namespace upm;
+
+WaterLevel::WaterLevel(int pin)
+{
+    m_gpio = mraa_gpio_init(pin);
+    mraa_gpio_dir(m_gpio, MRAA_GPIO_IN);
+}
+
+WaterLevel::~WaterLevel()
+{
+    mraa_gpio_close(m_gpio);
+}
+
+bool WaterLevel::isSubmerged()
+{
+	// Submerged causes 0; being above water is 1
+	return (!(bool)mraa_gpio_read(m_gpio));
+}

src/waterlevel/waterlevel.h

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+/*
+ * Author: Zion Orent <sorent@ics.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.
+ */
+#pragma once
+
+#include <mraa/gpio.h>
+
+namespace upm {
+  /**
+   * @brief C++ API for the Water Level Sensor
+   *
+   * The Water Level Sensor senses the water level.
+   * When the level rises, a ball with a magnet floats up and causes a switch to open.
+   * When the level falls, the magnet also falls and the switch closes.
+   *
+   * @defgroup waterlevel libupm-waterlevel
+   * @ingroup gpio waterlevel
+   */
+  /**
+   * @library libupm-waterlevel
+   * @sensor waterlevel
+   * @comname waterlevel
+   * @type liquid
+   * @man seeed
+   * @con gpio
+   * 
+   * @brief UPM module for the Grove Luminance Sensor
+   * 
+   * @snippet apds9002.cxx Interesting
+   */  class WaterLevel {
+  public:
+    /**
+     * Water Level Constructor
+     *
+     * @param pin digital pin to use
+     */
+    WaterLevel(int pin);
+    /**
+     * Water Level Destructor
+     */
+    ~WaterLevel();
+    /**
+     * @return bool  returns whether liquid has gone above sensor
+     */
+     bool isSubmerged();
+
+  private:
+        mraa_gpio_context m_gpio;
+	};
+}