| China is a famous agricultural country.Agriculture plays a decisive role in China's economy.In recent years,with the rapid development of Internet of Things(IOT)technology,the smart agricultural model supported by the IOT has become a new direction for China's agricultural development.In terms of composition sensing and material identification,Near-infrared spectroscopy technology has the characteristics of fast,non-destructive,etc.However,due to the limitations of various factors,most experiments can only be performed in an ideal laboratory environment.Based on a near-infrared spectroscopy component developed by Shanghai Institute of Technology Physics,and combined with the Internet of Things technology,This article designed a new type of spectral sensing node system.The system uses a passive solar light source to acquire,transmit by wireless module,store and display the object's reflection spectrum under the outdoor natural environment.This system can be used both as hand-held spectrometers and on UAV platforms for remote control,and point-to-point acquisition of object spectral information.The main tasks of the dissertation are as follows:(1)Based on the STM32 chip's internal timer interrupt function,a high-quality and high-precision spectrum component driving timing signal was obtained;a spectrum data acquisition and storage module and a control display module were made;benefiting from the optimized hardware design and software programming,the size of the system was greatly reduced,while the system's functionality is enriched.(2)Thanks to the enhanced NRF24L01 wireless communication module,The ideal communication distance of the system is up to 2Km.Lithium battery power supply and dedicated USB charging module are designed to support the use while charging,and it can be used continuously for more than 10 hours at one time.In the information display design,two coordinate axes are created on the LCD screen in an innovative way.The spectral data can be visually displayed using a graphic method,and the real-time spectral information and the previously acquired spectral data can be compared.(3)Design the structure of the acquisition node.In order to minimize the weight of the shell and ensure the precision of the processing,the flexible photosensitive resin is selected as the material of the system shell;in order to ensure the system's sealed light-proof performance,a push-pull type plug for SD card insertion and ejection ports and charging interfaces is designed,which can largely reduce the stray light interference when the node works normally.(4)A large number of experiments were designed to verify the performance of the system.And the M600 PRO,an industrial application-class drone platform produced by DJI Dajiang Technology Co.,Ltd.,was used to collect spectral information of ground objects at an outdoor altitude of 50 meters.The results show that the system not only has the characteristics of miniaturization and low power consumption,with a shell size of only 8.3cm×6.3cm×6.0cm and power consumption less than 1W,but also can work stably in an outdoor environment.It is expected that the system and a special component analysis algorithm will be combined later to obtain crop growth information in real time and provide an effective and reliable reference for agricultural production. |
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