Wireless Data Acquisition System For Hybrid Transmission Of Energy And Information

Wireless charging is applied to the wireless sensing system,which solves the problem of energy life and extends the operational time of the system.However,at present,all the wireless charging based wireless data acquisition systems use an additional wireless communication module to transmit sensor data,which undoubtedly increases the size,power consumption and cost of the sensor node.In a Qi protocol based wireless charging system,the transmitter and the receiver use the load modulation and frequency modulation technique to perform bidirectional communication.If the sensor data can be transmitted using the communication link of the wireless charging system while ensuring the normal transmission of the power control information,the wireless data acquisition system does not need an additional wireless communication module.Therefore,the research content of this paper is as follows:1.We propose to transmit sensor data through the communication link of the wireless charging system.By analyzing the working phase characteristics of the wireless charging system,the communication link redundancy in the power transmission phase,the Qi protocol packet class,and the packet transmission time limit,this paper verifies the feasibility of the idea and designs the sensor data transmission scheme.2.By analyzing the modulation mode and data transmission format of bidirectional communication and combining with the peripheral resources of STM32,a bidirectional communication coding and decoding scheme suitable for STM32 is designed.The experimental results show that the scheme has large tolerance,strong anti-interference ability and fewer resources requirement.3.Based on the STM32 platform and the Free-RTOS embedded operating system,the system hardware and software are completed,and the system functions are realized.4.For the practical application of kitchen air monitoring,an extended definition of the proprietary packet is proposed.Then,the function test and the performance analysis of the wireless data acquisition system with mixed energy and information transmission are carried out,including receiver identification,power transmission and data acquisition.This paper proposes to transmit sensor data through the communication link of the wireless charging system,and designs a wireless data acquisition system with energy and information hybrid transmission.The system eliminates the need for an additional wireless communication module,which simplifies the system circuit,reduces the size and power consumption of the data acquisition node,and reduces the cost,so it has broad application prospects.