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diff --git a/src/drivers/px4flow/i2c_frame.h b/src/drivers/px4flow/i2c_frame.h
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+++ b/src/drivers/px4flow/i2c_frame.h
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+/****************************************************************************
+ *
+ *   Copyright (c) 2013-2015 PX4 Development Team. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name PX4 nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/**
+ * @file i2c_frame.h
+ * Definition of i2c frames.
+ * @author Thomas Boehm <thomas.boehm@fortiss.org>
+ * @author James Goppert <james.goppert@gmail.com>
+ */
+
+#ifndef I2C_FRAME_H_
+#define I2C_FRAME_H_
+#include <inttypes.h>
+
+
+typedef  struct i2c_frame
+{
+    uint16_t frame_count;
+    int16_t pixel_flow_x_sum;
+    int16_t pixel_flow_y_sum;
+    int16_t flow_comp_m_x;
+    int16_t flow_comp_m_y;
+    int16_t qual;
+    int16_t gyro_x_rate;
+    int16_t gyro_y_rate;
+    int16_t gyro_z_rate;
+    uint8_t gyro_range;
+    uint8_t sonar_timestamp;
+    int16_t ground_distance;
+} i2c_frame;
+
+#define I2C_FRAME_SIZE (sizeof(i2c_frame))
+
+
+typedef struct i2c_integral_frame
+{
+    uint16_t frame_count_since_last_readout;
+    int16_t pixel_flow_x_integral;
+    int16_t pixel_flow_y_integral;
+    int16_t gyro_x_rate_integral;
+    int16_t gyro_y_rate_integral;
+    int16_t gyro_z_rate_integral;
+    uint32_t integration_timespan;
+    uint32_t sonar_timestamp;
+    uint16_t ground_distance;
+    int16_t gyro_temperature;
+    uint8_t qual;
+} i2c_integral_frame;
+
+#define I2C_INTEGRAL_FRAME_SIZE (sizeof(i2c_integral_frame))
+
+#endif /* I2C_FRAME_H_ */