The purpose of this research is to develop a cheap, accurate and autonomous quadcopter. This quadcopter contains microcontroller, gyroscope, accelerometer, barometer, electronic governor and brushless motor. At present, the noise removal filter of the quadcopter sold on the market is a complementary filter, and its disadvantage is that it will produce distortion when the attitude changes at a large angle. Therefore, in order to improve the shortcomings of the complementary filter in the quadcopter, we use the Kalman filter to replace complementary filters to achieve goal. At the same time, through the bluetooth remote connection, the flight situation can be immediately known, and the remote unmanned and stable flight of the quadcopter aerial camera can be achieved, so that the disaster areas or places that are difficult for exploration personnel to quickly obtain stable and clear images for convenient arrangement of rescue operations.
Because the thread is easy to install, disassemble, and replace, and most of the threads have been standardized, the miniaturized internal thread structure is quite special, the size is extremely small, and the space position is limited, so that the current common measurement mechanism cannot achieve effective measurement. Based on the above reasons, this research aims to develop a portable miniaturized metric internal thread contact detector. The parameter values that can be detected by the detector respectively include the hole diameter value under the inner thread before tapping, the minor diameter value and the major diameter value of the internal thread after tapping. Then, use the quadratic element measuring instrument to measure three parameter values, namely the lower diameter value, the smaller diameter value of the internal thread, and the value of the major diameter of the internal thread. It is then verified with the theoretical value of the metric internal thread, which proves that the experimental parameter values designed in this study are consistent with the theoretical values. That is to say, the miniaturized metric internal thread detector can be applied to any miniaturized metric internal thread detection place, and can accurately detect the obtained parameter values, and can overcome the detection limitation given by the miniaturized internal thread in the space structure. Finally, the easy availability of the detector and the relatively low cost are its main development advantages.
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