The Research And Implementation Of LEACH In WSN Based On NRF24L01

Wireless sensor network(WSN in short)consist of large amounts of distributed sensor nodes in the monitoring region.The network is supposed to real-time monitor and collect the data of regional objects through transmission channels among wireless sensor and send the data to the user.At present,the wireless sensor network has a wide range of research and development including national economic development and national security and stability,application including industrial production,military defense and home health care etc.,which cause much attention from people around the world.The wireless sensor nodes in a network are under many constraints,such as size,weight and work life.Most of these nodes are powed by batteries for energy supplement,which limited the nodes working life.Because many nodes may be out of work due to the low-power and quit the network,the transmission task will fail in this case.At the same,it is very inconvienent to replace the batteries frequently due to the environmental constraints,so low-energy comsuption is an very important factor in design of netwok structure,routing algorithm,system structure and hardware for wireless sensor network.In addition,the routing algorithms for the network has great influence on network working efficiency.In order to obtain a higher working efficiency and improve the lifetime of wireless sensor networks,many routing protocols are optimized according to the actual applicated modle.Among these optimized protocols,clustering algorithm LEACH has a optimization of clustering head selection and data fusion,while shortest path algorithm makes improments in data transmission effective shortest path choice.Through these optimized algorithm,the workload and enery consumption of nodes has be reduced and the network achieve the goal of low-energy transmission task.According to the shortcomings in the traditiongal wireless sensor network,this thesis design a new low-energy system based on low power consumption MCF51QE128 single-chip microcomputer as the control core,combined with wireless transmission module nRF24L01,a data wireless transmission,armed with optimized LEACH algorithm,which improve the selection of clustering head,and optimized Dijstra SPFA algorithm,which improved the choice of shortest path in data transmission.Experiments show that this system has a long distance in transmission,low power consumption,high reliability,and been used widely.