CN201418155Y

CN201418155Y - Wireless sensor network node

Info

Publication number: CN201418155Y
Application number: CN2009200222181U
Authority: CN
Inventors: 王翥; 宋佳; 郝晓强; 魏德宝
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-02-18
Filing date: 2009-02-18
Publication date: 2010-03-03
Anticipated expiration: 2019-02-18

Abstract

The utility model relates to a wireless sensor network node, which is a node capable of realizing low power consumption. The wireless sensor network node is characterized in that synchronization and calibration of network time and conversion control of working modes of long-term sleeping and timing awaking of all nodes are realized through a precise clock module. After a wireless sensor network isbuilt, node clocks in the whole network are synchronized firstly, and then on the basis of the synchronous node clocks, the precise clock module awakes nodes in long-term sleeping according to set time to respond commands of a host machine to complete data acquisition and transmission and the like, and further, the nodes are converted into a mode of long-term sleeping to wait for next awaking. The wireless sensor network node used for a wireless sensor network system has the advantages of remote control functions, synchronous time of network nodes, reducing frequently periodical awaking and sleeping of nodes, saving a large quantity of battery energy, greatly reducing power consumption of the system and the like, thereby greatly increasing energy effectiveness and effectively expanding lifecycle of the whole network.

Description

Wireless sensor network node

Affiliated technical field

The utility model relates to the node in a kind of wireless sensor network, can realize in the wireless sensor network long-time sleeping and the timing wake-up working mode change of node in the data synchronization collection and network, greatly reduce node power consumption, be applicable to the wireless sensor network of low-power consumption.

Background technology

Wireless sensor network (Wireless Sensor Networks, WSN) as an emerging technology, form by being deployed in cheap miniature nodes a large amount of in the surveyed area, form the self-organizing network of a multi-hop by communication, gather and handle the perceptive object information in the surveyed area collaboratively, and send to the observer.Its appearance has produced a kind of brand-new information and has obtained and tupe, in conjunction with sensors of various types, in various fields such as environmental monitoring, military surveillance, Smart Home, intelligent transportation, Industry Control wide application prospect is arranged.

Wherein wireless sensor network is the self-organizing network that is made of a large amount of sensor nodes cheaply.Because operational environment and cost reason, sensor node uses powered battery usually, and energy is very limited, therefore improves energy efficiency, prolongs the key technology that network life becomes the sensor network design.Collection for data in the actual detection environment generally is not very frequent, and present sensor node generally is to realize frequently waking up of short cycle by the sleep timer of microprocessor internal, patrol and examine whether the collection of data requirement is arranged, the calibration of clock is to realize by the relevant communication protocol software algorithm, has bigger defective in actual applications.

Summary of the invention

In order to overcome the complexity of time arouse machine processed, time synchronized and calibration frequent in the existing sensors network, the utility model provides a kind of wireless sensor network node that has accurate clock module.The MCU of the accurate clock module Control Node of node can realize the conversion of network time synchronization and calibration and long-time sleeping and timing wake-up, greatly reduces node power consumption, thereby has expanded the life cycle of whole network effectively.

The utility model solves the problems of the technologies described above the technical scheme that is adopted:

A kind of wireless sensor network node comprises MCU, system clock, RF module, power module and sensor interface module, it is characterized in that: also comprise accurate clock module; Wherein, described MCU is electrically connected with described system clock, described RF module, described power module, described sensor interface and described accurate clock module, is used to control sensor acquisition data and control radio communication RF module and other nodes and carries out radio communication; Described system clock is electrically connected with described MCU, for the work of node provides the stable external clock; Described RF module is electrically connected with described MCU, realizes the transmitting-receiving communication of wireless signal under the control of MCU; Described power module is described MCU, described RF module, described accurate clock module each several part electrical connection, and stable power is provided; Described sensor interface one end is electrically connected with described MCU, and the various transducers of another termination are used to finish various parameter measurements; Described distinctive accurate clock module is made up of the accurate clock chip and the peripheral components of band alarm clock, is electrically connected with described MCU.

The accurate real-time timepiece chip of the outer tape splicing alarm clock function of wireless sensor network node, make node be in closed condition at one's leisure, arrive whenever the image data time, the MCU system of being opened node by clock chip output interrupt signal is with the instruction of response host computer, and the line data collection of going forward side by side of calibration local clock is after data acquisition finishes, program control MCU system cut-off, make wireless sensor network node be in closed condition once more, change long-time dormancy over to, until interrupt wake-up signal next time.

The beneficial effects of the utility model are, utilize accurate clock module control wireless sensor network node to realize long dormancy and timing wake-up, time synchronized and calibration, promptly guaranteed pick-up transducers node data on time, having reduced the frequent cycle of node again wakes up and dormancy, a large amount of energy contents of battery have been saved, make the power consumption of node lower to a great extent, thus the life cycle that has prolonged whole network.

Description of drawings

Fig. 1 is the hardware block diagram of the utility model node;

Fig. 2 is the write operation working timing figure of the accurate clock chip of the utility model node;

Fig. 3 is the accurate clock chip Control Node of a utility model node MCU working timing figure.

Embodiment

Below in conjunction with drawings and Examples the utility model is further specified.

As shown in Figure 1, a kind of hardware block diagram of wireless sensor network node mainly comprises MCU, system clock, RF module, power module, sensor interface and accurate clock module composition.Wherein, 1. MCU is the control centre of whole sensor node; 2. system clock provides the stable external clock for the work of node; 3. the RF module realizes the transmitting-receiving of wireless signal under the control of MCU; 4. power module provides stable power for node and peripheral module, generally realizes with battery; 5. sensor interface is used for being connected of node and transducer; 6. precisely clock module is made up of the accurate clock chip and the peripheral components of band alarm clock, makes node can carry out long period dormancy and timing wake-up working mode change, realizes the time synchronized of whole network and finishes the synchronous data collection function.

MCU is the control centre of whole wireless sensor network node, all have with system clock, RF module, power module, sensor interface and accurate clock module to be connected, be used to control sensor acquisition data and control radio communication RF module and other nodes and carry out radio communication; System clock is connected with MCU, for the work of node provides the stable external clock; The RF module is connected with MCU, realizes the transmitting-receiving communication of wireless signal under the control of MCU; Power module is generally realized with battery for MCU, RF module, precisely the clock module each several part provides stable power; Sensor interface one end links to each other with MCU, and the various transducers of another termination are used to finish various parameter measurements; Precisely clock module is made up of the accurate clock chip and the peripheral components of band alarm clock, links to each other with MCU, makes node can carry out long period dormancy and timing wake-up working mode change, realizes the time synchronized of whole network and finishes the synchronous data collection function.

Wireless sensor network node is realized long-time dormancy and timing wake-up working mode change by the accurate clock module of node.

Before wireless sensor network node work, preestablish clock chip time data regularly in the accurate clock module, when timing then, the interrupt pin output pulse that clock chip links to each other with MCU, the trailing edge of pulse (perhaps rising edge) wakes MCU up when arriving, MCU control whole node is started working, the instruction of wait-for-response PC control, carry out work such as parameter acquisition, transmission data, after work was finished, program control MCU changed long-time dormancy once more over to, waited for and waking up next time.

The equal external clock chip of each node in wireless sensor network, after network struction is finished, network coordinator can receive the time synchronizing signal that Surveillance center's computer is sent at once, then this information broadcast is given all the sensors node (comprising network router and terminal node) in the network, all the sensors node can be finished the initialization local clock by this information.

Finish after interior all the nodal clock synchronous initiations of network, set the time that clock chip wakes node up, timing arrives then clock chip output interrupt signal, sensor node (comprising router and terminal node) is waken up, the instruction of response host computer, finish the collection and the transmission of data, make node change long-time dormancy once more over to afterwards, wait for the interruption wake-up signal of clock chip next time.

By Fig. 2 as seen to clock chip write operation working timing figure, when setting clock chip, write the address earlier, writing then needs time data regularly, in the clock chip Control Node MCU of Fig. 3 working timing figure, when timing then, the middle fracture output pulse that clock chip links to each other with MCU, trailing edge (perhaps rising edge) wakes MCU up when arriving, node begins the instruction of wait-for-response PC control then, gather, transmit work such as data, after work was finished, program control MCU changed long-time dormancy once more over to, waited for and waking up next time.

Wake all nodes in the network up in the moment (such as point in evening 0) that every day is fixing, telegon meeting tranmitting data register calibrating signal, each node is received calibrating signal, reinitializes local clock, thus the time of finishing whole network is recalibrated.

The foregoing description is used for explaining the utility model, rather than the utility model is limited, and in the protection range of spirit of the present utility model and claim, any modification and change to the utility model is made all fall into protection range of the present utility model.