Design And Implementation Of Wireless Network Node Based On NRF24L01

The paper analyse the characteristics and system structure of wireless WSN first. Then expound the technology of wireless sensor network, nRF24L01application, the current development status of routing protocol. According to the existing sensor network technology, in line to meet demand for low-cost short-range communication in wireless sensor network research, in order to achieve the low power microcontroller ATmegal6L as the control core, use nRF24L01chip as the core, DS18B20as the temperature sensor signal environment around the acquisition.Design including the hardware design of node and software design of the detailed measurement and network protocol for nRF24L01wireless module and the relevant unicast routing algorithm. The design is important for wireless control, wireless survey, wireless sensor networks, agricultural and animal husbandry production, smart home, industrial production and other wireless networks with applications have very important significance.In addition, in-depth study of the various performance characteristics of nRF24L01, including receiving mode, transmission mode, data packet format, automatic retransmission and automatic response and design, and the method for selecting a channel, make the wireless network as much as possible to avoid unnecessary interference, a custom response mode design. Selection also introduces the hardware design and the module of every module in the system of the device.The designed of this article based on the hardware design to achieve the software design, this article uses a centralized routing algorithm,and according to the characteristics of the nRF24L01routing table, using the network nodes are ordinary nodes and the coordinator node peer-to-peer communication,unicast routingalgorithm. The routing table calculated by the coordinator node is sent to the various general network nodes. Before calculating the routing table, the coordinator node must also obtain the topology of the entire network. Designed to achieve this coordination node get network topology process.This paper also designed a number of point to point and network communication function test, to verify the implementation of the communication network, the experiments show that the design in this paper meets the design requirements.