Research And Design Of Distributed Synchronous Data Acquisition System Based On CC2530

In the bridge structure health monitoring application,synchronous data acquisition is an important part of it,which provides important raw data for the health assessment of bridge structure.The performance of synchronous data acquisition will directly affect the results of the health assessment of the bridge structure.In view of the current bridge structure health monitoring synchronous acquisition system,there are problems such as low data acquisition accuracy,large power consumption,large time synchronization error between nodes and poor stability.This paper chooses a wireless sensor network solution with low cost,low power consumption,distributed self-organizing network and other advantages.Based on CC2530 low power chip,a distributed synchronous data acquisition system is designed.The system is mainly composed of three parts: time synchronization mechanism design,sensor node hardware and software design.(1)Time synchronization mechanism design.The four typical time synchronization algorithms of wireless sensor networks are studied and compared.The Flooding Time Synchronization Protocol with better comprehensive performance is selected as the research object.A frame-based delimitation is designed.The FTSP time synchronization mechanism captured by the Start of Frame Delimiter is improved and its synchronization accuracy and stability are improved.(2)Sensor node hardware design.Taking the CC2530 chip as the core,the modular hardware design is used to design the hardware core board and the backplane of the node.According to the hardware function and power consumption requirements of the coordinator,router and terminal acquisition node,the microprocessor and wireless data transceiver module are mainly designed.The circuit,the serial data communication module circuit,the power module circuit,the LCD display module circuit,the resistance strain type pressure sensor module circuit and the signal conditioning module circuit,etc.,simultaneously complete the PCB drawing and physical production of the corresponding module circuit..(3)Sensor node software design.The IAR software development tool and Z-Stack protocol stack are used to design the coordinator,router and terminal collection node software and networking program,as well as the time synchronization mechanism and the coordinator node serial data communication program.Finally,on the software and hardware platform designed in this paper,the time synchronization error and stability between system nodes and the system strain signal acquisition accuracy are tested.The experimental results show that the improved FTSP time synchronization mechanism of the system design in the three-hop network has an average time synchronization error as low as 9.167?s and good stability.At the same time,the synchronous acquisition accuracy of the bridge strain signal is micro-strain level.Both can meet the needs of synchronous data collection in bridge structure health monitoring applications.