Design Of A Solar-powered Wireless UHF Reader Based On Cortex-M3

After the first and the second wave of information technology, the Internet of Things technology, as is so called the third wave of information technology is coming.Based on the internet, the Internet of Things technology combines various objects into a large wisdom networks through the recognition technology, such as radio frequency identification, sense technology and so on.The radio frequency identification technology, as one of the key technology of the Internet of Things, has been used in every aspect of our life, such as the campus card,the bus card and the non-stop electronic toll collection, etc. Put simply, the radio frequency identification technology can non-contact acquire the information in the electronic tag through electromagnetic coupling and inductive coupling.The current UHF reader cannot work independently in outdoor, because it have to use wired line to get the energy or communicate with computers. This situation greatly restricts the reader’s application. In order to solve this problem, combining the solar energy technology and RFID technology, a wireless solar-powered UHF reader is designed after analyzing the ISO/IEC 18000-6C protocol and wireless communication theory in this thesis. The main works of this thesis are listed as follows:First, the UHF reader is powered by the solar energy, therefore it can work in outdoors for a long time. The energy collected by the solar panels is stored into the large capacity lithium battery, A power management circuit is designed at the same time.Second, reader can wirelessly communicate with the computer through the Bluetooth module. This module has two advantages: low power consumption and long distance communication.Third, the hardware circuit is designed in this thesis. STM32F103VET6 belongs to the Cortex-M3 series is the MCU of the system, and it is used to process the baseband signal. A transmitter and receiver circuit is designed in this thesis.Fourth, after a detailed analysis on the ISO/IEC 18000-6C protocols, a new CRC algorithm has been proposed and it improves the efficiency of the reader.Last, in order to support multitasks, a real-time operation system μCOS-II is transplanted into the MCU. The upper software communicating with the reader is coded by C++ on VS2008 platform.