CN101984726A

CN101984726A - Grain condition measurement and control system based on wireless sensor network

Info

Publication number: CN101984726A
Application number: CN2010105249455A
Authority: CN
Inventors: 叶海挺
Original assignee: NINGBO SIBODA ELECTRONIC TECHNOLOGY Co Ltd
Current assignee: NINGBO SIBODA ELECTRONIC TECHNOLOGY Co Ltd
Priority date: 2010-10-29
Filing date: 2010-10-29
Publication date: 2011-03-09

Abstract

The invention discloses a grain condition measurement and control system based on a wireless sensor network. The system comprises a measurement and control host computer connected with a personal computer (PC), a plurality of measurement and control auxiliary computers arranged outside granaries and sensing elements in wireless connection with the measurement and control auxiliary computers. The system of the invention is characterized in that each sensing element contains at least a temperature-measuring cable component and a temperature and humidity sensor; the temperature-measuring cable component contains a first wireless communication terminal, a connecting cable and a plurality of temperature-measuring cables; each temperature and humidity sensor contains a second wireless communication terminal and a temperature and humidity acquisition chip; and each measurement and control auxiliary computer is provided with an input keyboard and a display screen and also provided with a first wireless communication module with the frequency of 470MHz and a second wireless communication module with the frequency of 433MHz which are used to realize the communications between the measurement and control host computer and the first wireless communication terminal and second wireless communication terminal respectively. The invention has the following advantages: the mutual interferences of communication signals can be effectively prevented, the energy consumptions of the wireless communication terminals can be reduced, the cost of the system can be lowered and the measurement and control can be performed to each single granary according to the need.

Description

A kind of grain information monitoring system based on radio sensing network

Technical field

The present invention relates to a kind of grain information monitoring system, especially relate to a kind of grain information monitoring system based on radio sensing network.

Background technology

Existing grain information monitoring system is the grain ends of loveization such as temperature and humidity that exist in the grain storage process, the system that its environmental parameter is monitored and controlled that is provided with for the quality that guarantees stored grain.Traditional grain information monitoring system exists more defective to be substituted by the grain information monitoring system based on radio sensing network gradually because of adopting wired mode.As on December 12nd, 2007 disclosed application number be to disclose a kind of grain information monitoring system in No. 200610012130.2 Chinese invention patent Shen Qing Publication specifications based on radio sensing network, realize grain information monitoring by a terminal server and a plurality of dissimilar radio node are set for a grain depot.But this TT﹠C system also exists following defective, the one, and radio node uses independent DC power supply, for grain information monitoring, often needs to use about 3 years; The 2nd, can produce signal when communicating between each radio node and disturb with terminal server and enabling communication between nodes; Can not leave terminal server and easily single silo be carried out the data adjustment; In addition, use a plurality of sensing nodes can increase the cost of whole TT﹠C system greatly.

Summary of the invention

Technical problem to be solved by this invention provides that a kind of power consumption is less, signal can the phase mutual interference, can leave terminal server carries out data adjustment and lower-cost grain information monitoring system based on radio sensing network to single silo easily.

The present invention solves the problems of the technologies described above the technical scheme that is adopted: a kind of grain information monitoring system based on radio sensing network, comprise a measurement and control host computer that is connected with PC, a plurality of be arranged on the outer observing and controlling extension set of each silo and with the senser element of described observing and controlling extension set wireless connections, described senser element comprises at least one group of cable for measuring temperature assembly and a humidity temperature pickup, described cable for measuring temperature assembly comprises first wireless communication terminal, stube cable that is connected with described first wireless communication terminal and Duo Gen are set up in parallel the cable for measuring temperature on described stube cable, described humidity temperature pickup comprises second wireless communication terminal and temperature humidity acquisition chip, described observing and controlling extension set is provided with input keyboard and display screen, it is second wireless communication module of 433MHz that described observing and controlling extension set is provided with first wireless communication module and the frequency that frequency is 470MHz, carry out radio communication by first wireless communication module between described measurement and control host computer and the described observing and controlling extension set, carry out radio communication by second wireless communication module between described observing and controlling extension set and described first wireless communication terminal and described first wireless communication terminal.

Be set side by side with six cable for measuring temperature on the described stube cable, described cable for measuring temperature is provided with at least two thermometric chips.

Described first wireless communication terminal comprises that model is that single-chip microcomputer and the model of P89LPC922 is the radio transmitting and receiving chip of CC1100, and described single-chip microcomputer is provided with external real time clock circuit.

Compared with prior art, the invention has the advantages that the observing and controlling extension set is set to the double frequency communication device, can prevent the phase mutual interference between the signal of communication effectively; Simultaneously, consider that the communication distance between observing and controlling extension set and cable for measuring temperature assembly and the humidity temperature pickup is less than 200 meters usually, and adopt 433 to carry out wireless leading to, then can reduce the wireless communication terminal energy consumption greatly, prolong the useful life of battery; Same employing frequency is that first wireless communication module and the measurement and control host computer of 470MHz communicates, because being first wireless communication module of 470MHz, frequency is provided with signal amplification circuit, then can in 2 kilometers scope, not use any trunk module just can finish each other communication, can reduce the cost of system, and the observing and controlling extension set is arranged on outside the silo, can use mains-supplied, not have the problem in useful life; And substitute wireless senser with cable for measuring temperature, and then can reduce the quantity of battery, reduce the cost of whole system greatly, and input keyboard and display screen are set at the observing and controlling extension set, then can carry out observing and controlling to independent silo as required easily; External real time clock circuit is set on the single-chip microcomputer in first and second wireless communication terminals, can interrupts arousal function, further reduce the energy consumption of wireless communication terminal by the software setting self-timing.

Description of drawings

Fig. 1 is a system configuration schematic diagram of the present invention;

Fig. 2 is the circuit theory diagrams of observing and controlling extension set of the present invention;

Fig. 3 is the circuit theory diagrams of measurement and control host computer of the present invention;

Fig. 4 is the circuit theory diagrams of the present invention's first wireless communication terminal.

Embodiment

Embodiment describes in further detail the present invention below in conjunction with accompanying drawing.

As shown in the figure, a kind of grain information monitoring system based on radio sensing network, comprise PC 1 that is arranged on central machine room and the measurement and control host computer 2 that is connected with PC 1, be outside equipped with observing and controlling extension set 3 at each silo, the interval is provided with one group of cable for measuring temperature assembly 4 for 5 meters in silo, surface at the grain heap is provided with a humidity temperature pickup 5, cable for measuring temperature assembly 4 comprises first wireless communication terminal 41, the stube cable 42 that is connected with first wireless communication terminal 41 and the six roots of sensation are set up in parallel the cable for measuring temperature 43 on stube cable 42, every cable for measuring temperature 43 is from top to bottom by the state specified standards monobus numeral thermometric chip 44 that to be arranged at intervals with four models be DS18B20, humidity temperature pickup 5 comprises the temperature humidity acquisition chip 52 that second wireless communication terminal 51 identical with first wireless communication terminal, 41 structures and model are SHT11, first wireless communication terminal 41 and second wireless communication terminal 51 comprise that model is the single-chip microcomputer U1 of P89LPC922 and the radio transmitting and receiving chip U2 that model is CC1100, single-chip microcomputer U1 goes up except the onboard clock circuit, also be provided with external real time clock circuit K1, observing and controlling extension set 3 is provided with input keyboard 31 and display screen 32, observing and controlling extension set 3 is provided with can be the first wave point JRFA that is connected of first wireless communication module (figure show) of 470MHz with commercially available frequency and can be the second wave point JRFB that second wireless communication module (scheming demonstration) of 433MHz is connected with commercially available frequency, carry out radio communication by first wireless communication module between measurement and control host computer 2 and the observing and controlling extension set 3, carry out radio communication by second wireless communication module between the observing and controlling extension set 3 and first wireless communication terminal 41 and second wireless communication terminal 51.

Observing and controlling extension set 3 is based on the dual band wireless communication design of Platform, observing and controlling extension set 3 is 470MHZ with the radio communication fundamental frequency of measurement and control host computer 2, observing and controlling extension set 3 is 433MHZ with the radio communication fundamental frequency of wireless communication terminal, She Ji purpose can be avoided the wireless communication terminal when observing and controlling extension set 3 sends acquisition of measurement and control host computer 1 under the same frequency range to send the channel occupancy conflict that image data cause to observing and controlling extension set 3 disturbing first like this, causes data to transmit to make mistakes or omits; Second the physical distance between grain depot central machine room and each silo is much larger than the physical distance between observing and controlling extension set 3 and each wireless communication terminal, measurement and control host computer 2 is 470MHZ with the fundamental frequency of communicating by letter between the observing and controlling extension set 3, having back level signal amplifies, transmitting power 27dbm (0.5W), the open field communication distance can reach 2Km; And the fundamental frequency of communicating by letter of observing and controlling extension set 3 and each wireless communication terminal is 433MHZ, transmitting power 10dbm, and quiescent current 2uA, communication distance 250m is fit to the requirement of powered battery low-power consumption mode.Such technical scheme is saved the device material cost greatly satisfying under the prerequisite of working condition requirement, the wireless communication module price of 470MHZ0.5W is 200 yuan of RMB, and the wireless communication module of 433MHZ only needs 30 yuan of RMB.

The main control chip of measurement and control host computer 2 adopts the LPC2103 chip of PHILIPS ARM7 series, built-in 470MHZ wireless communication module, and integration standard RS232 interface and PC 1 communicate.

Claims

1. grain information monitoring system based on radio sensing network, comprise a measurement and control host computer that is connected with PC, a plurality of be arranged on the outer observing and controlling extension set of each silo and with the senser element of described observing and controlling extension set wireless connections, it is characterized in that described senser element comprises at least one group of cable for measuring temperature assembly and a humidity temperature pickup, described cable for measuring temperature assembly comprises first wireless communication terminal, stube cable that is connected with described first wireless communication terminal and Duo Gen are set up in parallel the cable for measuring temperature on described stube cable, described humidity temperature pickup comprises second wireless communication terminal and the temperature humidity acquisition chip identical with the described first wireless communication terminal structure, described observing and controlling extension set is provided with input keyboard and display screen, it is second wireless communication module of 433MHz that described observing and controlling extension set is provided with first wireless communication module and the frequency that frequency is 470MHz, carry out radio communication by first wireless communication module between described measurement and control host computer and the described observing and controlling extension set, carry out radio communication by second wireless communication module between described observing and controlling extension set and described first wireless communication terminal and described second wireless communication terminal.

2. a kind of grain information monitoring system based on radio sensing network as claimed in claim 1 is characterized in that being set side by side with on the described stube cable six cable for measuring temperature, and described cable for measuring temperature is provided with at least two thermometric chips.

3. a kind of grain information monitoring system as claimed in claim 1 based on radio sensing network, it is characterized in that described first wireless communication terminal comprises that model is that single-chip microcomputer and the model of P89LPC922 is the radio transmitting and receiving chip of CC1100, described single-chip microcomputer is provided with external real time clock circuit.