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diff --git a/sensorlib/sht21.h b/sensorlib/sht21.h
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+//*****************************************************************************
+//
+// sht21.h - Prototypes for the SHT21 accelerometer driver.
+//
+// Copyright (c) 2013-2014 Texas Instruments Incorporated.  All rights reserved.
+// Software License Agreement
+// 
+// Texas Instruments (TI) is supplying this software for use solely and
+// exclusively on TI's microcontroller products. The software is owned by
+// TI and/or its suppliers, and is protected under applicable copyright
+// laws. You may not combine this software with "viral" open-source
+// software in order to form a larger program.
+// 
+// THIS SOFTWARE IS PROVIDED "AS IS" AND WITH ALL FAULTS.
+// NO WARRANTIES, WHETHER EXPRESS, IMPLIED OR STATUTORY, INCLUDING, BUT
+// NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE. TI SHALL NOT, UNDER ANY
+// CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL, OR CONSEQUENTIAL
+// DAMAGES, FOR ANY REASON WHATSOEVER.
+// 
+// This is part of revision 2.1.0.12573 of the Tiva Firmware Development Package.
+//
+//*****************************************************************************
+
+#ifndef __SENSORLIB_SHT21_H__
+#define __SENSORLIB_SHT21_H__
+
+//*****************************************************************************
+//
+// If building with a C++ compiler, make all of the definitions in this header
+// have a C binding.
+//
+//*****************************************************************************
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+//*****************************************************************************
+//
+// The structure that defines the internal state of the SHT21 driver.
+//
+//*****************************************************************************
+typedef struct
+{
+    //
+    // The pointer to the I2C master interface instance used to communicate
+    // with the SHT21.
+    //
+    tI2CMInstance *psI2CInst;
+
+    //
+    // the I2C address of the SHT21.
+    //
+    uint8_t ui8Addr;
+
+    //
+    // the state of the state machine used while accessing the
+    // SHT21.
+    //
+    uint8_t ui8State;
+
+    //
+    // the data buffer used for sending/receiving data to/from the
+    // SHT21.
+    //
+    uint8_t pui8Data[5];
+
+    //
+    // the 16 bit raw temperature reading
+    //
+    uint16_t ui16Temperature;
+
+    //
+    // the 16 bit raw humidity reading
+    //
+    uint16_t ui16Humidity;
+
+    //
+    // the function that is called when the current request has
+    // completed processing.
+    //
+    tSensorCallback *pfnCallback;
+
+    //
+    // the callback data provided to the callback function.
+    //
+    void *pvCallbackData;
+
+    //
+    // A union of structures that are used for read, write and
+    // read-modify-write operations.  Since only one operation can be active at
+    // a time, it is safe to re-use the memory in this manner.
+    //
+    union
+    {
+        //
+        // A buffer used to store the write portion of a register read.
+        //
+        uint8_t pui8Buffer[2];
+
+        //
+        // The write state used to write register values.
+        //
+        tI2CMWrite8 sWriteState;
+
+        //
+        // The read-modify-write state used to modify register values.
+        //
+        tI2CMReadModifyWrite8 sReadModifyWriteState;
+    }
+    uCommand;
+}
+tSHT21;
+
+//*****************************************************************************
+//
+// Function prototypes.
+//
+//*****************************************************************************
+extern uint_fast8_t SHT21Init(tSHT21 *psInst, tI2CMInstance *psI2CInst,
+                              uint_fast8_t ui8I2CAddr,
+                              tSensorCallback *pfnCallback,
+                              void *pvCallbackData);
+extern uint_fast8_t SHT21Read(tSHT21 *psInst, uint_fast8_t ui8Reg,
+                              uint8_t *pui8Data, uint_fast16_t ui16Count,
+                              tSensorCallback *pfnCallback,
+                              void *pvCallbackData);
+extern uint_fast8_t SHT21Write(tSHT21 *psInst, uint_fast8_t ui8Reg,
+                               const uint8_t *pui8Data,
+                               uint_fast16_t ui16Count,
+                               tSensorCallback *pfnCallback,
+                               void *pvCallbackData);
+extern uint_fast8_t SHT21ReadModifyWrite(tSHT21 *psInst, uint_fast8_t ui8Reg,
+                                         uint_fast8_t ui8Mask,
+                                         uint_fast8_t ui8Value,
+                                         tSensorCallback *pfnCallback,
+                                         void *pvCallbackData);
+extern uint_fast8_t SHT21DataRead(tSHT21 *psInst, tSensorCallback *pfnCallback,
+                                  void *pvCallbackData);
+extern void SHT21DataTemperatureGetRaw(tSHT21 *psInst,
+                                       uint16_t *pui16Temperature);
+extern void SHT21DataTemperatureGetFloat(tSHT21 *psInst, float *pfTemperature);
+extern void SHT21DataHumidityGetRaw(tSHT21 *psInst, uint16_t *pui16Humidity);
+extern void SHT21DataHumidityGetFloat(tSHT21 *psInst, float *pfHumidity);
+
+//*****************************************************************************
+//
+// Mark the end of the C bindings section for C++ compilers.
+//
+//*****************************************************************************
+#ifdef __cplusplus
+}
+#endif
+
+#endif // __SENSORLIB_SHT21_H__