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diff --git a/peripheral/libupm/src/ppd42ns/ppd42ns.h b/peripheral/libupm/src/ppd42ns/ppd42ns.h
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+++ b/peripheral/libupm/src/ppd42ns/ppd42ns.h
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+/*
+ * Author: Zion Orent <sorent@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.
+ */
+#pragma once
+
+#include <string>
+#include <time.h>
+#include <mraa/aio.h>
+
+namespace upm {
+
+typedef struct
+{
+	int lowPulseOccupancy;
+	double ratio;
+	double concentration;
+} dustData;
+
+  /**
+   * @brief PPD42NS Dust Sensor library
+   * @defgroup ppd42ns libupm-ppd42ns
+   * @ingroup seeed gpio other eak
+   */
+  /**
+   * @library ppd42ns
+   * @sensor ppd42ns
+   * @comname PPD42NS Dust Sensor
+   * @altname Grove Dust Sensor
+   * @type other
+   * @man seeed
+   * @web http://www.seeedstudio.com/wiki/Grove_-_Dust_Sensor
+   * @con gpio
+   * @kit eak
+   *
+   * @brief API for the PPD42NS Dust Sensor
+   *
+   * UPM module for the PPD42NS dust sensor
+   *
+   * @image html ppd42ns.jpg
+   * @snippet ppd42ns.cxx Interesting
+   */
+  class PPD42NS {
+  public:
+    /**
+     * PPD42NS constructor
+     *
+     * @param pin Digital pin to use
+     */
+    PPD42NS(int pin);
+    /**
+     * PPD42NS destructor
+     */
+    ~PPD42NS();
+    /**
+     * Prints dust concentration
+     *
+     * @return struct dustData  Contains data from the dust sensor
+     */
+     dustData getData();
+
+  private:
+        mraa_gpio_context m_gpio;
+		/**
+		 * Returns the amount of time it takes a pin to go from HIGH to LOW or from LOW to HIGH
+		 *
+		 * @param highLowValue int Do we measure movements from HIGH to LOW or from LOW to HIGH? highLowValue is the "from" value
+		 */
+		double pulseIn_polyfill(bool highLowValue, double endTime);
+		double m_timediff(timespec time1, timespec time2);
+	};
+}
+
+