CN201524516U

CN201524516U - Automatic dehumidification device

Info

Publication number: CN201524516U
Application number: CN2009200659653U
Authority: CN
Inventors: 胡玉平; 李征坤; 龙文; 梁烈全; 梁英宏; 刘辉
Original assignee: Guangdong University of Business Studies
Current assignee: Guangdong University of Business Studies
Priority date: 2009-09-21
Filing date: 2009-09-21
Publication date: 2010-07-14
Anticipated expiration: 2019-09-21

Abstract

The utility model discloses an automatic dehumidification device, including a singlechip, a temp/moisture sensor, an input keyboard, a memory, a relay, and a dehumidifier, wherein the input terminal of the input terminal singlechip is respectively connected the temp/moisture sensor and the input keyboard, the output end of the singlechip is respectively connected to the input terminal of the display and the control terminal of the relay, the memory is in communication connection with the singlechip, and the relay is connected to the control terminal of the dehumidifier. The utility model can perform real time measurement to the temperature and humidity of the internal environment of space. When the internal humidity is greater than the upper limit of the set value, the relay is controlled to attract, and start the dehumidifier; when the humidity is less than the lower limit of the set value, the relay is controlled to disconnect and close up the dehumidifier, to achieve that the relative humidity is remained in the set range. The utility model effectively solves the adverse effect of the environment high humidity on the production and life, and has simple structure, easy operation, and no need of human duty.

Description

A kind of automatic dehydrating unit

Technical field

The utility model relates to a kind of automatic dehydrating unit.

Background technology

China's southern area humidity is bigger, and especially at the end of spring and the beginning of summer plum rain season, humidity is generally all more than 80%, and temperature also reaches more than 25 ℃ simultaneously.Under this environment, microbial growths such as mould breedings is exceedingly fast, and the clothing that causes storing, books etc. go mouldy, and have influenced the normal daily life of people.Simultaneously also may use and be damaged because of the excessive influence of humidity with closely bound up some the important production equipments of industrial production, may be as the circuit board in the Digit Control Machine Tool cabinet because of moist and produce short circuit and cause burning out; Some precisions and valuable instrument bigger measure error can occur when using under moisture conditions, even can not normally use; If the interior humidity of distribution cabinet is excessive in the power system, can produce negative influence to the electric energy dispensing, even have influence on whole electrical network, may produce blast when serious.

The utility model content

Excessive for humidity in the air in the solution daily life, cause the affected technical problem of people's productive life, the utility model provides a kind of and can dehumidify automatically according to ambient conditions, and simple in structure, the automatic dehydrating unit of easy operating.

The scheme that the utility model solves the problems of the technologies described above is: a kind of automatic dehydrating unit, comprise single-chip microcomputer, Temperature Humidity Sensor, input keyboard, memory, display, relay and dehumidifier, the input of described single-chip microcomputer is connected to Temperature Humidity Sensor and input keyboard respectively, the output of single-chip microcomputer is connected to the input of display and the control end of relay respectively, described memory is connected with single chip communication, and described relay is connected with the control end of dehumidifier.

Technique effect of the present utility model is: the utility model can be measured in real time to the interior volume ambient temperature and humidity.When humidity inside greater than the going up in limited time of setting value, the control relay adhesive starts dehumidifier, control relay disconnects humidity, closes dehumidifier in limited time less than setting value following, realizes that relative humidity remains in the scope of setting.Solved effectively under the high humility of environment the harmful effect that productive life caused, and simple and reliable for structure, easy and simple to handle, need not manually on duty.

Below in conjunction with accompanying drawing the utility model is further described.

Description of drawings

Fig. 1 is a circuit block diagram of the present utility model;

Fig. 2 is humiture testing circuit figure of the present utility model;

Fig. 3 is chip external memory X24C02 interface circuit figure of the present utility model;

Fig. 4 is a LCD interface circuit diagram of the present utility model;

Fig. 5 is keyboard interface circuit figure of the present utility model;

Fig. 6 is control output interface circuit figure of the present utility model;

Fig. 7 is a course of work flow chart of the present utility model.

The specific embodiment

Referring to Fig. 1, the utility model comprises single-chip microcomputer, Temperature Humidity Sensor, and input keyboard, memory, relay and dehumidifier, Temperature Humidity Sensor are finished warm and humid data acquisition, and transfer of data to single-chip microcomputer handled, single-chip microcomputer is controlled the start and stop of miniature dehumidifier by relay.Present embodiment adopts " capital, river " miniature dehumidifier, removes wetted surface 1-2m ², moisture removal: 0.14 liter/day, power: 8.5W, volume: 81*67*177MM, suitable environment: 15 ℃＜T＜55 ℃,＞35%RH.

Referring to Fig. 2, the SHT15 monolithic integrated sensor that Temperature Humidity Sensor adopts Switzerland to produce, it is a kind of sensor that can measure temperature, humidity and dew point simultaneously, do not need peripheral cell just can directly export data signal, can remedy traditional temperature, the deficiency of humidity sensor effectively through relative temperature, humidity and the dew point of having demarcated.

The measurement sequential of SHT15 is as follows: when a SCK is high level, low level appears in DATA, SCK becomes low level then, then when SCK is high level again, DATA also becomes high level and then represents to begin reading and writing data (initiating sequence), an ensuing command sequences comprises three address bits and five command bits, SCK continues the clock of transmission one-period and represents ACK, at this moment sensor begins to measure, behind about 210ms (corresponding 14 precision), sensor is sent low level and is represented measure to finish on DATA, at this moment send measurement data and verification and.

Reliable for what guarantee to measure, should check verification and.Affirmation bit representation communication with the CRC data finishes.If do not use the CRC-8 verification, controller can be ended communication by keeping an affirmation position ACK high level behind measured value LSB.After measurement and communication end, SHT15 will change resting state automatically over to.

The temperature that Temperature Humidity Sensor SHT15 sends, humidity data must could be represented the temperature and humidity of reality through data transaction, and its formula is as follows: the output characteristics of SHT15 is certain non-linear.Non-linear obtaining accurate data for what compensate humidity sensor, can be by following formula correction humidity value:

Temperatue＝d ₁+d ₂×SO _T

RH _linear＝c ₁+c ₂×SO _RH+c ₃×SO _RH ²

RH _true＝(T _℃-25)×(t ₁+t ₂×SO _RH)+RH _linear

In the formula: Temperature is a temperature; RH _LinearBe meant the correction linear value of SHT15 humidity sensor; RH _TureBe relative humidity through temperature-compensating; D1, d2 are relevant with temperature resolution; C1, C2, C3, t1, t2 are relevant with humidity resolution ratio; SO _TThe temperature value that expression is read from SHT15; SO _RHThe humidity value that expression is read from SHT15.Its corresponding relation is shown in table 1, table 2.

Table 1 temperature correction facotor

SO _T	d ₂[℃]	d ₂[°F]
SO _T	d ₂[℃]	d ₂[°F]	14bit	0.01	0.018
12bit	0.04	0.072	14bit	0.01	0.018

Table 2 humidity correction factor

SO _RH	c ₁	c ₂	c ₃	t ₁	t ₂
SO _RH	c ₁	c ₂	c ₃	t ₁	t ₂	12bit	-4	0.0405	-2.8*10 ^-6	0.01	0.00008
8bit	-4	0.648	-7.2*10 ^-4	0.01	0.00128	12bit	-4	0.0405	-2.8*10 ^-6	0.01	0.00008

Referring to Fig. 3, the data that adopt the X24C02 storage chip scene of realizing to import are preserved under the situation of outage for a long time, re-entering when avoiding start shooting next time.X24C02 is the E2PROM of band I2C EBI, and its capacity is 256 * 8.Single-chip microcomputer itself just can carry out read/write operation to it, writes data and can preserve more than 10 years under powering-off state.P3.0 is as sda line among the figure, and P3.1 is as the SCK line.A2, A1, A0 are the pin address.Can meet 8 X24C02 on the bus altogether, the design only adopts a slice X24C02, with A0-A2 ground connection.WP is the write-protect pin, because X24C02 does not have the write-protect function, so this pin ground connection.

Referring to Fig. 4, adopt 1602 LCDs to show Current Temperatures in real time, the setting value of humidity and measured value.The character generation memory (CGROM) of 1602 Liquid Crystal Module inside stores 160 different dot character figures, and these characters have the capital and small letter of Arabic numerals, English alphabet, symbol commonly used etc.1602 adopt 16 pin interfaces of standard, and wherein: VSS is the ground power supply, and VDD connects the 5V positive supply, and V0 is a LCD contrast adjustment end, adjusts contrast by the potentiometer of a 10K.RS is that register is selected, selection instruction register when selecting data register, low level during high level, RW is a reading writing signal line, carry out read operation during high level, carry out write operation during low level, the E end is Enable Pin, when the E end becomes low level by the high level saltus step, Liquid Crystal Module fill order, these 3 pins are controlled by P3.5, P3.6, the P3.7 of single-chip microcomputer respectively.D0～D7 is 8 bidirectional data lines, connects the P0 mouth of single-chip microcomputer.

Referring to Fig. 5, Keysheet module is made up of 4 keys, adopts independent button keyboard.4 keys link to each other with P1.4, P1.5, P1.6 and the P1.7 pin of single-chip microcomputer respectively, adopt interrupt mode, when arbitrary button is pressed, all can send the external interrupt request to single-chip microcomputer, and laggard line unit function treatment is interrupted in the single-chip microcomputer response.Wherein SET key (P1.4) is used to enter the adjustment of system's humidity set point, with "+" (P1.5) and "-" (P1.6) key adjust the setting value of humidity, adjust the back and return by ENT key (P1.7).

Referring to Fig. 6, the control output circuit is used to control dehumidifier, and control end is selected the P3.4 in the single-chip microcomputer P3 mouth for use, and when P 3.4 was high level, relay worked in length and opens state, and when P 3.4 was low level, relay worked in the long state that closes.

Referring to Fig. 7, after system powers on and starts working, can set the upper limit value and lower limit value of humidity according to actual needs, the Single-chip Controlling Temperature Humidity Sensor is measured in real time to little interior volume ambient temperature and humidity.Humidity inside goes up in limited time greater than setting value, and the control relay adhesive starts dehumidifier automatically, and humidity is prescribed a time limit less than the following of setting value, and control relay disconnects, and closes dehumidifier, realizes that relative humidity remains in the scope of setting.

Claims

1. automatic dehydrating unit, it is characterized in that, comprise single-chip microcomputer, Temperature Humidity Sensor, input keyboard, memory, display, relay and dehumidifier, the input of described single-chip microcomputer is connected to Temperature Humidity Sensor and input keyboard respectively, the output of single-chip microcomputer is connected to the input of display and the control end of relay respectively, and described memory is connected with single chip communication, and described relay is connected with the control end of dehumidifier.