CN203433398U

CN203433398U - Digital grain depot temperature-humidity monitoring system based on AT89C52 and DHT11

Info

Publication number: CN203433398U
Application number: CN201320579063.8U
Authority: CN
Inventors: 曹昌勇; 孔敏; 邬志军; 孙勇; 李鸿宾; 贾伟建; 周小超; 林华; 李金胜
Original assignee: West Anhui University
Current assignee: West Anhui University
Priority date: 2013-09-18
Filing date: 2013-09-18
Publication date: 2014-02-12
Anticipated expiration: 2023-09-18

Abstract

The utility model discloses a digital grain depot temperature-humidity monitoring system based on an AT89C52 and a DHT11. The system comprises an AT89C52 single-chip microcomputer. Input ends of the AT89C52 single-chip microcomputer are respectively connected with a unibus digital temperature-humidity sensor DHT11, a clock module and a keyboard input module. Output ends of the AT89C52 single-chip microcomputer are respectively connected with an acousto-optic alarm module, a ventilation control circuit and an LED display module. By means of field debugging, field temperature-humidity data of a plurality of points in a grain depot are collected, and according to the test results, the digital grain depot temperature-humidity monitoring system based on the AT89C52 and the DHT11 basically meets the requirements of field temperature-humidity data collection. A relative temperature-humidity display value is +/- (2-5)% of the real temperature of the grain depot, and is in the range of permitted measurement errors. The whole monitoring system is high in response speed and good in real-time performance. By adopting the digital grain depot temperature-humidity monitoring system, the grain preservation quality is improved, manpower is saved, the economic benefit of the grain depot is greatly increased, and the real application value is relatively good.

Description

Based on AT89C52 and the digital grain depot temperature and humidity monitoring system of DHT11

Technical field

The utility model relates to a kind of grain depot supervisory system, specifically a kind of based on AT89C52 and the digital grain depot temperature and humidity monitoring system of DHT11.

Background technology

In grain depot, the temperature and humidity of grain is two key factors that affect grain storage life and quality.The humiture distribution of piling in order to understand in time grain depot China Oil and Food Import and Export Corporation, accurate analysis grain heap humiture changes and takes in time respective handling measure, for the grain storage quality, the loss of minimizing stored grain that improve in warehouse, is extremely important.Existing supervisory system is large owing to being subject to grain depot floor area, and the impact that controlled device is disperseed exists automaticity compared with the shortcoming such as low, measuring error is large, response speed is slow, real-time is poor.

Utility model content

For above-mentioned technical matters, the purpose of this utility model be to provide a kind of automaticity compared with high, measuring error is little, fast response time, real-time are good based on AT89C52 and the digital grain depot temperature and humidity monitoring system of DHT11.

For achieving the above object, the utility model provides following technical scheme:

The digital grain depot temperature and humidity monitoring system of AT89C52 and DHT11, comprises AT89C52 single-chip microcomputer, and described AT89C52 single-chip microcomputer input end connects respectively unibus digital hygro sensor DHT11, clock module and keyboard load module; AT89C52 single-chip microcomputer output terminal connects respectively sound and light alarm module, Ventilation Control circuit and LED display module.

As further program of the utility model: on described AT89C52 single-chip microcomputer, two-way being connected with expanded module CAN/USB.

Compared with prior art, the beneficial effects of the utility model are:

1. the accuracy showing for this supervisory system of checking humiture, through field adjustable, gathers the on-the-spot humiture data of multiple spot in silo, and experimental result finds that the utility model temperature and humidity monitoring system meets the requirement of on-the-spot humiture data acquisition substantially.Relative humiture shows that numerical value, at storage actual temperature ± (2 – 5) %, belongs to and measures within the scope of permissible error.

2. this supervisory system adopts novel all-in-one unibus DHT11 Temperature Humidity Sensor to realize the signals collecting of temperature and humidity, by internal circuit, carry out analog to digital conversion, convert simulating signal to digital signal and deliver to master controller and carry out data analysis processing and show.Whole supervisory system fast response time, real-time is good.

3. in order to realize Long-distance Control or PC control, this supervisory system can be expanded and realize networking, is easy to realize the centralized management of each subsystem and monitoring, realizes the robotization of monitoring.Adopt after this system, not only improved grain and preserved quality, but also saved manpower, increased substantially the economic benefit of grain depot, there is good actual application value.

Accompanying drawing explanation

Fig. 1 is the structured flowchart based on AT89C52 and the digital grain depot temperature and humidity monitoring system of DHT11.

Embodiment

Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is only the utility model part embodiment, rather than whole embodiment.Embodiment based in the utility model, those of ordinary skills are not making the every other embodiment obtaining under creative work prerequisite, all belong to the scope of the utility model protection.

Refer to Fig. 1, in the utility model embodiment, the digital grain depot temperature and humidity monitoring system of AT89C52 and DHT11, comprises AT89C52 single-chip microcomputer, and AT89C52 single-chip microcomputer input end connects respectively unibus digital hygro sensor DHT11, clock module and keyboard load module; AT89C52 single-chip microcomputer output terminal connects respectively sound and light alarm module, Ventilation Control circuit and LED display module.

As further program of the utility model: described AT89C52 single-chip microcomputer and expanding two-way connection of module CAN/USB.

The main control unit that the utility model adopts is the low-voltage of American ATMEL exploitation, high-performance position AT89C52 single-chip microcomputer, the 8K byte that contains sheet can repeat the random access memory ram of erasable 1000 read only memory ROMs and 256 * 8 bytes, 32 programmable I/O mouths, 3 16 bit timing counters, 8 interrupt sources, duplexing serial communication port and clock circuit, 8 central authorities of sheet built-in general-purpose process and Flash storage unit, completely compatible with MCS-51 series of instructions and pin.This chip functions is powerful, is applicable to complex control application scenario.

That in the utility model, Temperature Humidity Sensor is selected is the unibus digital hygro sensor DHT11 of the integrated unibus structure of a wet temp of Guangzhou Ao Song company limited production.This sensor comprises a NTC temperature element and a resistance-type hygrometric element, this sensor mainly contains following performance index: operating voltage range: 3.5V-5.5V, working current: average 0.5mA, temperature measurement range: 0-50 ℃, moisture measurement scope: 20-90%RH humidity resolution: 1%RH(8 position), temperature resolution: 1 ℃ (8), the sampling period is 1S.This Temperature Humidity Sensor has four pins, and method of attachment is simple.The first pin Vcc connects positive supply, and crus secunda Dout is data terminal output, tripod NC be empty pin can be unsettled need not, the 4th pin GND connects power supply and holds.Unibus digital hygro sensor DHT11 power consumption is very low, and under 5V supply voltage, the average maximum current of working can reach 0.5mA.

In the utility model, 8 AT89C52 single-chip microcomputers of unibus digital hygro sensor DHT11 and a high-performance carry out simple circuit and are connected and just can realize real-time humiture data acquisition.Data transmission can adopt unibus structure to communicate (only needing an I/O mouth), therefore be referred to as unibus system structure, once to transmit data 40Bit.Data acquisition can be guaranteed the accuracy of data transmission with verification mode verification.

The utility model is to take AT89C52 single-chip microcomputer as control core, adopts integrated unibus digital hygro sensor DHT11 to carry out humiture data acquisition.This supervisory system is when normal operation, by unibus digital hygro sensor, DHT11 realizes real-time data acquisition, after processing through AT89C52 single-chip microcomputer, deliver to LED display module and carry out humiture demonstration, if while overflowing in procedure for displaying, can send optoacoustic warning message by sound and light alarm module, and control Ventilation Control circuit and ventilate.According to actual needs, the utility model can also carry out module expansion, can realize the design of CAN bus module, and serial port module design etc., realize host computer or telecommunication.

To those skilled in the art, obviously the utility model is not limited to the details of above-mentioned one exemplary embodiment, and in the situation that not deviating from spirit of the present utility model or essential characteristic, can realize the utility model with other concrete form.Therefore, no matter from which point, all should regard embodiment as exemplary, and be nonrestrictive, scope of the present utility model is limited by claims rather than above-mentioned explanation, is therefore intended to include in the utility model dropping on the implication that is equal to important document of claim and all changes in scope.Any Reference numeral in claim should be considered as limiting related claim.

In addition, be to be understood that, although this instructions is described according to embodiment, but not each embodiment only comprises an independently technical scheme, this narrating mode of instructions is only for clarity sake, those skilled in the art should make instructions as a whole, and the technical scheme in each embodiment also can, through appropriately combined, form other embodiments that it will be appreciated by those skilled in the art that.

Claims

1. one kind based on AT89C52 and the digital grain depot temperature and humidity monitoring system of DHT11, it is characterized in that, comprise AT89C52 single-chip microcomputer, described AT89C52 single-chip microcomputer input end connects respectively unibus digital hygro sensor DHT11, clock module and keyboard load module; AT89C52 single-chip microcomputer output terminal connects respectively sound and light alarm module, Ventilation Control circuit and LED display module.

2. according to claim 1ly based on AT89C52 and the digital grain depot temperature and humidity monitoring system of DHT11, it is characterized in that, on described AT89C52 single-chip microcomputer, two-way being connected with expanded module CAN/USB.