Design And Production Of Active RFID System Based On Solar Photovoltaic

Radio Frequency Identification is an automatic identification technology, which was invented in the1980s. In the past few decades, it was developed step by step and became mature. With the development of the internet of things and some advanced technologies in these years, RFID have a broader application space. Relative to the Passive RFID system, the Active RFID system has a longer communication distance. The research of Active RFID system has great significance in many practical applications, such as monitoring container, identifying vehicle, tracking wild animals and so on.In the Active RFID system, we use battery to supply power for the electronic tag usually. But battery’s life is limited, if it’s exhausted, we need to replace it by human regularly. On some occasions, it’s dangerous and hard to get to the place. On the other hand, the battery is not friendly to the environment. However, the solar power is a kind of ideal environment energy, because it has many outstanding advantages, such as inexhaustible, clean and non-pollution. Based on solar energy, this thesis puts forward to use solar energy photovoltaic power to supply power for active RFID tags. In this thesis, we design a low power consumption active RFID system which is powered by solar energy. Combining the software and hardware, we design and manufacture the reader and the electronic tag in modular.In this thesis, at first we introduced the developments and backgrounds of the RFID technology and photovoltaic power, explained the operating principle and classification of RFID, and analyzed the key technology in Active RFID system. Secondly, we proposed the detail overall design scheme, designed the Reader and the active tags, of which using STC12LE5604AD microcontroller as the main controller, nRF24L01as the RF chip, designed and manufactured the hardware circuit board. Then we designed the power supply for the active tag, including select the model of super capacitor and solar panel, analyze and test the charge-discharge time of super capacitor, design solar energy collecting module and energy storage module, to ensure that the output voltage can be stable enough to the tag. After that with the power supply device, tested the system’s communication distance, stability and power supply time, verified the feasibility of the system. At last, summarized the full work in the paper and had an outlook about this system, proposed the existing part which can improve and needed to be improved urgently.After testing and debugging, this power supply device can supply capacity stability, the RFID system can work well. With this power supply, the tag can work well too. In the open space, the RFID system’s communication distance can reach more than80m, we can also see that the system has good monitoring position ability.