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diff --git a/LibOVR/Src/OVR_SensorImpl_Common.h b/LibOVR/Src/OVR_SensorImpl_Common.h
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+/************************************************************************************
+
+Filename    :   OVR_SensorImpl_Common.h
+Content     :   Source common to SensorImpl and Sensor2Impl.
+Created     :   January 21, 2014
+Authors     :   Lee Cooper
+
+Copyright   :   Copyright 2014 Oculus VR, Inc. All Rights reserved.
+
+Licensed under the Oculus VR Rift SDK License Version 3.1 (the "License"); 
+you may not use the Oculus VR Rift SDK except in compliance with the License, 
+which is provided at the time of installation or download, or which 
+otherwise accompanies this software in either electronic or hard copy form.
+
+You may obtain a copy of the License at
+
+http://www.oculusvr.com/licenses/LICENSE-3.1 
+
+Unless required by applicable law or agreed to in writing, the Oculus VR SDK 
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+
+*************************************************************************************/
+
+#ifndef OVR_SensorImpl_Common_h
+#define OVR_SensorImpl_Common_h
+
+#include "Kernel/OVR_System.h"
+#include "OVR_Device.h"
+
+namespace OVR 
+{
+
+void UnpackSensor(const UByte* buffer, SInt32* x, SInt32* y, SInt32* z);
+void PackSensor(UByte* buffer, SInt32 x, SInt32 y, SInt32 z);
+
+// Sensor HW only accepts specific maximum range values, used to maximize
+// the 16-bit sensor outputs. Use these ramps to specify and report appropriate values.
+const UInt16 AccelRangeRamp[] = { 2, 4, 8, 16 };
+const UInt16 GyroRangeRamp[]  = { 250, 500, 1000, 2000 };
+const UInt16 MagRangeRamp[]   = { 880, 1300, 1900, 2500 };
+
+UInt16 SelectSensorRampValue(const UInt16* ramp, unsigned count,
+                                    float val, float factor, const char* label);
+
+// SensorScaleImpl provides buffer packing logic for the Sensor Range
+// record that can be applied to DK1 sensor through Get/SetFeature. We expose this
+// through SensorRange class, which has different units.
+struct SensorRangeImpl
+{
+    enum  { PacketSize = 8 };
+    UByte   Buffer[PacketSize];
+    
+    UInt16  CommandId;
+    UInt16  AccelScale;
+    UInt16  GyroScale;
+    UInt16  MagScale;
+
+    SensorRangeImpl(const SensorRange& r, UInt16 commandId = 0);
+
+    void SetSensorRange(const SensorRange& r, UInt16 commandId = 0);
+    void GetSensorRange(SensorRange* r);
+
+    static SensorRange GetMaxSensorRange();
+
+    void  Pack();
+    void Unpack();
+};
+
+struct SensorConfigImpl
+{
+    enum  { PacketSize = 7 };
+    UByte   Buffer[PacketSize];
+
+    // Flag values for Flags.
+    enum {
+        Flag_RawMode            = 0x01,
+        Flag_CalibrationTest	= 0x02, // Internal test mode
+        Flag_UseCalibration		= 0x04,
+        Flag_AutoCalibration	= 0x08,
+        Flag_MotionKeepAlive    = 0x10,
+        Flag_CommandKeepAlive   = 0x20,
+        Flag_SensorCoordinates  = 0x40
+    };
+
+    UInt16  CommandId;
+    UByte   Flags;
+    UInt16  PacketInterval;
+    UInt16  KeepAliveIntervalMs;
+
+    SensorConfigImpl();
+
+    void    SetSensorCoordinates(bool sensorCoordinates);
+    bool    IsUsingSensorCoordinates() const;
+
+    void Pack();
+    void Unpack();
+};
+
+struct SensorFactoryCalibrationImpl
+{
+    enum  { PacketSize = 69 };
+    UByte   Buffer[PacketSize];
+    
+    Vector3f AccelOffset;
+    Vector3f GyroOffset;
+    Matrix4f AccelMatrix;
+    Matrix4f GyroMatrix;
+    float    Temperature;
+
+    SensorFactoryCalibrationImpl();
+
+    void     Pack();    // Not yet implemented.
+    void     Unpack();
+};
+
+
+// SensorKeepAlive - feature report that needs to be sent at regular intervals for sensor
+// to receive commands.
+struct SensorKeepAliveImpl
+{
+    enum  { PacketSize = 5 };
+    UByte   Buffer[PacketSize];
+
+    UInt16  CommandId;
+    UInt16  KeepAliveIntervalMs;
+
+    SensorKeepAliveImpl(UInt16 interval = 0, UInt16 commandId = 0);
+
+    void Pack();
+    void Unpack();
+};
+
+struct TrackerSample
+{
+    SInt32 AccelX, AccelY, AccelZ;
+    SInt32 GyroX, GyroY, GyroZ;
+};
+
+enum LastCommandIdFlags
+{
+    LastCommandId_Shutter = 1,
+    LastCommandId_LEDs    = 2
+};
+
+} // namespace OVR
+
+#endif // OVR_SensorImpl_Common_h