"基于HMC1022与NRF9E5的智能交通数据采集系统设计与实现"

Intelligent Transport Systems (ITS) is considered the current effective means to solve the problem of traffic congestion and improve road safety in large cities in China. Traffic data collection is the most basic link in ITS. This design analyzes the current status and problems of data collection systems at home and abroad, demonstrates the necessity of traffic data collection systems, and puts forward the basic requirements of traffic data collection systems. This paper elaborates on the signal acquisition module based on HMC1022 magnetic sensor, whose hardware circuit includes magnetic detection circuit, signal amplification circuit, and wireless RF transceiver circuit based on NRF9E5 chip. By using the HMC1022 dual-axis to detect changes in the magnetic field and performing appropriate calculations and conversion, errors can be effectively reduced. Through the NRF9E5-based transmission and reception modules, long-distance communication is achieved. Compared with the previous loop coil induction collection, this system has lower cost, higher accuracy, and easier maintenance. The wireless transmission module is powered by solar energy, which reduces the maintenance probability and minimizes the impact of equipment maintenance on traffic. The software is written in C language and edited and compiled in the KEIL integrated environment. Experimental results prove that the entire system has the advantages of high accuracy, low power consumption, convenience of use, and miniaturization. Keywords: magnetic sensor; signal acquisition; wireless RF transceiver; module design"