The Design Of ZigBee Wireless Sensor
A wireless sensor node hardware system based on Arduino open source platform and ZigBee protocol is proposed for the high cost and poor scalability of traditional wireless sensor nodes. Taking into account the design requirements of the system, the overall framework of the sensor node hardware system is given first, and then the concrete scheme of the processor module, the sensor module, the wireless communication module and the power module in the hardware system is given. The wireless sensor node hardware system can realize high performance, low cost and low power wireless environment data acquisition, and has more research and application value than traditional method.
Wireless sensor network is an important technical form of the network of the Internet of Things. It integrates sensor technology, information processing technology and wireless communication technology. Wireless sensor network node as the basic component of wireless sensor network, its performance advantages and disadvantages of the entire network work efficiency and work costs, so high-performance low-cost wireless sensor nodes become wireless sensor network design The essential. At present, there are two main types of wireless sensor nodes: one is the direct purchase of available nodes such as Micaz, TelosB node; the other is in a specific chip such as CC2430, CC2530 on the design of the node. The former node performance is good, but the price is more expensive and can be customizable poor, the latter node, although the price is cheap, but the development of large workload, and scalable interface less.
Arduino is a rapid popular in recent years, a controller, the core of its hardware circuit is an AVR chip, the whole board is similar in function to the microcontroller development board, but the Arduino board is much more powerful than the single-chip development board. ZigBee is a short-range wireless communication technology that can solve the last 100 m communication problem in the Internet of Things and has been widely used in intelligent transportation, intelligent medical, intelligent home and industrial automation. Based on Arduino's ZigBee wireless sensor node, this paper designs the Arduino hardware and software, which is rich in interface, rich in interface, easy to use, and can be used according to the development of wireless sensor network. Application requirements to achieve personalized system design and other features and ZigBee technology transmission delay is low, low complexity, high capacity, low power consumption, low cost and other characteristics together to achieve more practical and more suitable for the Internet of things Wireless sensor network node.There are many electronic components distributors to supply it.
The wireless sensor network node hardware circuit comprises a processor module, a sensor module, a wireless communication module and a power supply module. Among them, the power part of the entire node to provide energy, and the remaining three are energy modules. In this paper, Arduino Uno R3 function board circuit as the hardware design of the basic circuit board, combined with the actual needs of the circuit on the basis of the components of the deletion and functional modules increase. Arduino Uno R3 is the latest version of the Arduino USB interface series. All of its reference designs are based on the AVR chip ATmega328, both of which are pin compatible.
In each module of the node, the processor module adopts the ATmega328P-PU as the CPU to collect, for example how to program atmega328p, process and transmit the sensing data. The ATmega16U2-MU is used as the conversion chip to realize the USB interface data and the serial data of the processor. The sensor module is set to interface mode, the sensor is not directly selected and the sensor is connected to the circuit. The sensor module interface includes a digital signal interface and an analog signal interface. Wireless communication module using Digi's XBee ZB module, XBee ZB module through the RX, TX serial port and single-chip data communication. Power module using battery-powered and USB power supply collaboration mode, in order to avoid battery-powered and USB power supply access circuit at the same time conflict, the use of FDN34 0P FET to achieve battery power and USB power supply mode automatically switch. In addition, the node also controls the working status of the sensor module and the wireless communication module through the hardware-assisted form to reduce the working energy consumption of the node.
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