CN202855057U

CN202855057U - Environmental parameter monitoring system for vegetable greenhouse based on GSM (Global System for Mobile Communications) network

Info

Publication number: CN202855057U
Application number: CN 201220445266
Authority: CN
Inventors: 郑争兵
Original assignee: Shaanxi University of Technology
Current assignee: Shaanxi University of Technology
Priority date: 2012-09-04
Filing date: 2012-09-04
Publication date: 2013-04-03
Anticipated expiration: 2022-09-04

Abstract

The utility model discloses an environmental parameter monitoring system for a vegetable greenhouse based on a GSM (Global System for Mobile Communications) network. The system comprises an acquiring and monitoring terminal, a GSM network and a mobile phone monitoring terminal, wherein the acquiring and monitoring terminal adopts a temperature-humidity sensor SHT11 to realize the monitoring of temperature and humidity in the vegetable greenhouse in a timing mode and a random mode; A TC (Temperature Coefficient) 35 I module completes data exchange with the mobile phone monitoring terminal in the form of a short message; and the experiment and test result shows that the temperature monitoring range of the system is (-)10 DEG C to 40 DEG C; the error is within 0.4 DEG C; the humidity error is within 3%; and the temperature-humidity measuring precision requirements are satisfied.

Description

Environment of vegetable greenhouse parameter monitoring system based on the GSM network

Technical field

The utility model relates to wireless network monitoring field, specifically a kind of environment of vegetable greenhouse parameter monitoring system based on the GSM network.

Background technology

Along with the green house of vegetables of China is planted towards scale, industrialization future development, the informationalized management level in greenhouse directly affect output and the quality of agricultural product.Therefore, in process of production monitoring and the control of greenhouse-environment parameter is had great importance.Because the unbalancedness of China's each department agricultural development, and be subjected to the peasant to grasp the constraint of the ability of science and technology, traditional wired monitoring mode, complicated operation can not satisfy actual needs.Along with mobile phone the popularizing of rural area, system adopts the scheme of gsm wireless network to have more advantage.This wide network coverage is not subjected to distance limit, can realize in the mode of short message any time radio communication in any place.

The utility model content

The purpose of this utility model provides a kind of environment of vegetable greenhouse parameter remote monitoring system based on the GSM network transmission platform, adopts the mode of timed sending and random challenge effectively to realize the monitoring at booth scene, finishes the intellectuality of information processing.

For solving the problems of the technologies described above, the technical solution adopted in the utility model is:

Environment of vegetable greenhouse parameter monitoring system based on the GSM network, form by gathering monitoring terminal, GSM network and mobile phone monitoring terminal, described collection monitoring terminal comprises Temperature Humidity Sensor, clock circuit, display circuit, gsm module and single-chip microcomputer, and described Temperature Humidity Sensor, clock circuit, display circuit, gsm module are connected with single-chip microcomputer.

It is the Temperature Humidity Sensor of SHT11 that described Temperature Humidity Sensor adopts model, finishes the monitoring of humiture in the green house of vegetables with timing mode and random fashion, the exchange of finishing data with mode and the monitoring mobile phone terminal of short message by the TC35I module.

The function that the monitoring mobile phone terminal mainly realizes inquiring about environmental parameter and receives short message, the environmental parameter monitoring terminal is responsible for the collection of on-the-spot humiture, calculates and processing capacity, and its hardware configuration is as shown in Figure 1.

The model of described single-chip microcomputer is AVR single chip computer AT mega16.

The beneficial effects of the utility model are:

The utility model adopts the mode that gathers monitoring terminal and mobile phone terminal combination, has realized real-time, the wireless transmission of humiture data.On-the-spot test shows: the temperature monitoring scope of system is-10～40 ℃, and error is in 0.4 ℃, and the humidity error is in 3%, and mobile phone can obtain the humiture data at random.This device has the advantages such as hardware connection is simple, easy to operate, with low cost, and antijamming capability is strong, can be advantageously applied to other agriculture field monitoring fields.

Description of drawings

Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.

Fig. 1 is environmental parameter monitoring terminal structure in the utility model;

Fig. 2 is Temperature Humidity Sensor and single-chip microcomputer connection layout;

Fig. 3 is gsm module and single-chip microcomputer connection layout;

Fig. 4 is the monitoring terminal software flow pattern.

Embodiment

According to actual conditions, use 485 buses to enlarge distance and the way of data acquisition.Concrete principle of work is: Temperature Humidity Sensor gathers multipoint data, and ATmega16 finishes linearization process and the temperature compensation of these data and calculates, and the control gsm module is finished the radio communication of short message, shows the current time, humiture parameter and correlation parameter.

The humiture collection circuit

The accurate digital relative humidity of the monolithic whole school that the humiture collection circuit has adopted Switzerland Sensirion company to produce and temperature sensor SHT11.This sensor all is integrated in one Temperature Humidity Sensor, signal amplification conditioning, A/D conversion, I2C bus interface, has reliable CRC data transmission verifying function, with the I2C digital interface of industrial standard, output resolution ratio is that 14 humidity values and resolution are 12 temperature values.Whole chip finished digital output, exempt to debug, non-calibrating, exempt from peripheral circuit and full function of exchanging.The interface connecting circuit of SHT11 and AVR single chip computer AT mega16 as shown in Figure 2.The I2C interface pin PCO of ATmega16 links to each other with the clock pin DATA of SHT11, and reliable clock signal is provided, and pin PCI links to each other with the data pin DATA of SHT11, realizes control command and humiture data transfer.For fear of signal conflict, guarantee that by connect the 4.7K pull-up resistor at the DATA signal wire controller drive signal level is low level.The SHT11 power pack adopts direct current 5V to power, and adds decoupling capacitor, the composition of filter out power between power supply VCC and ground GND.

The gsm module interface circuit design

Gsm module is mainly used in accessing existing gsm cellular network, finishes the wireless transmission of data.The TC35i of Siemens is a technical grade gsm module of supporting the Chinese short message breath, is operated in GSM900 and GSM1800 two-band, but by AT order transmitted in both directions instruction and data.TC35i adopts the mode of serial communication, because operation level and the single chip computer AT mega16 of its interface are incompatible, therefore adopts the level transferring chip MAX3232 of U.S. letter company that the COMS level conversion is become Transistor-Transistor Logic level, realizes and the serial communication of single-chip microcomputer.Concrete interface circuit as shown in Figure 2.The serial data of TC35i module sends pin TXD_TC35 and receives pin RXD_TC35, and the serial data of single chip computer AT mega16 sends pin PD1 and receives pin PD0, is connected respectively to the sending and receiving that pin corresponding to MAX3232 can be realized data.In addition, by standard RS232 attachment plug, adopt hyper terminal can realize the TC35i modular debugging at PC.

Software for Design

The monitoring terminal of system mainly is the collection of being finished the humiture parameter by single chip computer AT mega16, process and and with the data interaction function of fixing monitoring mobile phone terminal.Single-chip microcomputer takes regularly the mode of reading manner and random response message search to read the humiture data, and its overall software flow pattern as shown in Figure 4.

After system powered on, at first single chip computer AT mega16 carried out initialization process: mainly comprise the time adjustment of clock chip DS1302 and pass through to send the AT instruction to the initialization of TC35I.Then detect whether SMS query is arranged, if having then read the humiture data, process and then send SMS message, otherwise then next step judges whether regularly to read the time, if not then withdraw from, if having then finish corresponding data and process.What adopt when TC35I sends short messages is that the PDU pattern is to realize the transmission of Chinese short message.

Claims

1. based on the environment of vegetable greenhouse parameter monitoring system of GSM network, it is characterized in that: form by gathering monitoring terminal, GSM network and mobile phone monitoring terminal, described collection monitoring terminal comprises Temperature Humidity Sensor, clock circuit, display circuit, gsm module and single-chip microcomputer, and described Temperature Humidity Sensor, clock circuit, display circuit, gsm module are connected with single-chip microcomputer.

2. the environment of vegetable greenhouse parameter monitoring system based on the GSM network according to claim 1 is characterized in that: it is the Temperature Humidity Sensor of SHT11 that described Temperature Humidity Sensor adopts model.

3. the environment of vegetable greenhouse parameter monitoring system based on the GSM network according to claim 1, it is characterized in that: the model of described single-chip microcomputer is AVR single chip computer AT mega16.