Design Of Environmental Monitoring System And Research Of Task Scheduling Algorithms In EH-WSN For Harsh Environment

The wireless sensor network is a network in which a large number of sensor nodes communicate with each other through multi-hop wireless links,and has many applications in information collection and environmental monitoring.However,once the sensor node is deployed,it cannot recharge or replace the battery.At the same time,the limited battery capacity and the serious pollution of the traditional battery to the environment restrict the development of the traditional wireless sensor network.In order to better apply wireless sensor network technology,energy harvesting wireless sensor networks have been extensively studied in recent years.In order to better study the characteristics of energy harvesting wireless sensor networks,this paper mainly does the following work:(1)A Zigbee-based solar energy collection sensor node is designed while applying the CC2530 module of TI's.Through the Z-Stack protocol stack,the energy collection type wireless sensor network is settled,and the network testing of the coordinator,router and terminal are also well-functioned.(2)The energy harvesting characteristics of the sensor nodes are verified under real conditions.The results show that on sunny days,when the solar panels are directly exposed to sunlight,the collected energy and used energy are basically the same.At noon,the collected energy is slightly higher than the consumption of node energy,while on cloudy days or at night,the sensor nodes are basically unable to collect energy.In addition,we have monitored and recorded the solar irradiance information of solar energy in different seasons,different weathers and different placement angles,which can provide a reliable basis for subsequent research.(3)Based on the above researches,this paper proposes a task scheduling algorithm which is suitable for energy harvesting wireless sensor networks,that is,the order and method of transmitting collected data according to the remaining energy of the nodes.The Truetime experimental results show that when the energy provided by the environment is fewer,the task scheduling algorithm can ensure the fairness of node energy allocation,the timeliness of urgent task transmission and the high processing rate of common tasks.