CN202614741U - Humidity detection device on basis of single-chip microcomputer - Google Patents

Abstract

The utility model discloses a humidity detection device on the basis of a singlechip microcomputer, which comprises a humidity sensor. The humidity is connected with an A/D (Analog to Digital) conversion chip; the A/D conversion chip is also connected with the singlechip; and the single-chip microcomputer is connected with a keyboard, a clock chip, an alarm and an LED (Light-emitting Diode) display. The environment humidity and time can be displayed in a real time; and the humidity detection device has an alarming function, has simple structure and is easy for a user to operate.

Description

A kind of SCM Based humidity detector

Technical field

The utility model relates to Humidity Detection and humidity control field, relates in particular to a kind of SCM Based humidity detector.

Background technology

Along with social information's the reach of science; Modern electronic product has almost permeated fields of society; Strong promotion the raising of development of social productivity and social informatization degree, simultaneously the modern electronic product performance is further improved, the rhythm of model change is more and more faster.Most widely used on various electronic products is various single-chip microcomputers; Ambient humidity all is the important parameter that will detect at a lot of career fields; No matter be the maintenance of the laboratory components and parts of scientific research, test production, grain reserves, munitions deposit, plant growth or the inside, campus; The detection of humidity, transmission and control all follow it that inseparable relation is arranged, and therefore design the humidity detector that a kind of cost is low, function is strong, simple and easy to do, are the focuses that the applicant pays close attention to.

Summary of the invention

The purpose of the utility model is, a kind of SCM Based humidity detector is provided, and this device is the humidity in the display environment accurately.

In order to realize above-mentioned task, the utility model takes following technical solution to be achieved:

A kind of SCM Based humidity detector; Comprise humidity sensor, it is characterized in that described humidity sensor is connected with the A/D conversion chip; The A/D conversion chip also is connected with a single-chip microcomputer, is connected with keyboard, clock chip, alarm and light-emitting diode display on the single-chip microcomputer.

Other characteristics of the utility model are:

Described single-chip microcomputer adopts the AT89C51 single-chip microcomputer of 51 series.

Described modulus conversion chip adopts the ADC0809 chip.

Described clock chip adopts the DS12B887 real-time timepiece chip.

Described humidity sensor adopts HIH3610 simulation humidity sensor.

The SCM Based humidity detector of the utility model, display environment humidity and time in real time, and have warning function, it is simple in structure, is easy to user's operation, and has the following advantages:

1) because humidity is tempolabile signal, and the level signal that converts to is the low level tempolabile signal, and less demanding to the A/D conversion so select comparatively cheap ADC0809A/D converter for use, greatly reduces the cost of device.

2) clock show can show year, the moon, day, the time, branch, second, and the time of clock can adjust, clock shows 12 and 24 hours two kinds of standards, standard had AM and PM to point out in 12 hours, and the RAM data can be preserved more than 10 years.

3) adopt light-emitting diode display, friendly interface is clear, and is easy to operate, rich display information, and also low in energy consumption, light shockproof.

4) the humidity presetting module has adopted keyboard mode, and the user is easy to operate.

Description of drawings

Fig. 1 is the principle schematic of the utility model.

Fig. 2 is ADC0809 modulus conversion chip and single-chip microcomputer connection layout.

Fig. 3 is the circuit diagram that humidity sensor HIH3610 is connected with modulus conversion chip ADC0809.

Fig. 4 is the circuit diagram of clock module.

Fig. 5 is the circuit diagram of keyboard and alarm module.

Fig. 6 is the circuit diagram of display module.

Below in conjunction with accompanying drawing and embodiment the utility model is done further to specify.

Embodiment

Referring to Fig. 1; This instance provides a kind of SCM Based humidity detector; Comprise 8 humidity sensors, described humidity sensor is connected with the A/D conversion chip, it is characterized in that; Described A/D conversion chip also is connected with a single-chip microcomputer, is connected with keyboard, clock chip, alarm and light-emitting diode display on the single-chip microcomputer.

In the present embodiment, single-chip microcomputer adopts the AT89C51 single-chip microcomputer of 51 series, and the A/D conversion chip adopts the ADC0809 chip, and clock chip adopts the DS12B887 real-time timepiece chip, and humidity sensor adopts HIH3610 simulation humidity sensor.

Single-chip microcomputer is controlled computing to each components and parts; Modulus conversion chip becomes digital signal to the analog signal conversion that humidity sensor collects; Clock chip carries out timing to the time on date and passes to single-chip microcomputer, and single-chip microcomputer shows the time through display module; Keyboard is in order to accomplish the setting of predetermined moisture value; Alarm is used for carrying out voice suggestion, and when the humidity that is detected surpassed or is lower than set definite value, alarm was just sounded, and reminds the staff that humidity is controlled; Light-emitting diode display shows humidity value in real time.

Fig. 2 is A/D conversion chip ADC0809 and single chip computer AT 89C51 connection layout.As shown in the figure, ADC0809 is the connection of three aspects with being connected of AT89C51: being connected of the connection of data bus, the connection of address bus and control bus.The data line D7-D0 of ADC0809 can directly be connected to the data bus of AT89C51.For the bus of AT89C51, the channel selecting port ADDA of ADC0809, ADDB, ADDC is attached thereto through 74LS373.Pin START and the ALE of ADC0809 are connected together, link AT89C51 /WR and the output terminal of pin P27 after Sheffer stroke gate, AT89C51 can carry out write operation to ADC0809 when carrying out the OUT instruction.The pin 0E of ADC0809 links AT89C51's/RD and the output terminal of pin P27 after Sheffer stroke gate, and AT89C51 can carry out read operation to ADC0809 when carrying out the IN instruction.

Fig. 3 is the circuit diagram that humidity sensor HIH3610 is connected with A/D conversion chip ADC0809, and 8 humidity sensor HIH3610 are by VCC power supply back work, and output voltage is connected on 8 input end IN-0-IN-7 of ADC0809 respectively.The 1D-8D of address latch 74ls373 links to each other with the 2-1-2-8 of ADC0809 respectively and links to each other with single-chip microcomputer, output terminal 1Q, 2Q; 8Q respectively with the ADD-1 of ADC0809; ADD-B, ADD-C links to each other, and purpose is to carry out address selection and address latch; Thereby choose the output signal of 8 humidity sensors respectively, guarantee that data decimation is accurate.

Fig. 4 is clock chip DS12B887 and single chip computer AT 89C51 connection layout; The DS end of clock chip is connected with the RD signal wire of single-chip microcomputer; The P23 pin of CS sheet choosing input single-chip microcomputer connects, and the AS address latch is connected with ALE/P, and R/W read-write input is connected with the WR pin; The output of IRQ interrupt request is connected with INT1 interrupt request pin, and AD0-AD7 bi-directional data, address multiplex always are connected with the P0 mouth.

Fig. 5 is keyboard and alarm and single chip computer AT 89C51 connection layout, in order to accomplish the setting of predetermined moisture value, is provided with 4 buttons, is respectively initiating key, adds a key, subtracts a key and acknowledgement key.Through button can different seasonal and different weather to factory in the scope of required humidity measuring circuit controlled humidity effectively regulate.In the present embodiment, except one independently button also utilized commercially available a kind of new keyboard as the initiating key, it can reduce keyboard taking the I/Q port to greatest extent.

When the detection indoor humidity surpassed or is lower than set definite value, alarm just sent warning, reminded the staff that humidity is controlled.

4 delivery outlets of keyboard circuit are connected on P10-P13 the input port of AT89C51 respectively, and one links to each other in the input port of alarm and the AT89C51P2 mouth.

Fig. 6 is display and single chip computer AT 89C51 connection layout, and display adopts 8 LED display circuits that humidity value is shown in real time.MAX7219 is a kind of integrated serial input, output common cathode display driver; The 7 piece of digital LED that it connects microprocessor and 8 bit digital show; Also can rat tail figure show or 64 LED independently, comprising the Type B BCD scrambler on the sheet, multi-channel scanning loop; The cross-talk driver, and also have the static RAM (SRAM) of a 8*8 to be used for storing each data.Have only an external register to be used for being provided with the section electric current of each LED.

One easily four line serial line interfaces can connect all general microprocessors.Each data can addressing need not be rewritten all demonstrations when upgrading.MAX7219 allows the user that each data is selected coding equally or does not encode.

Entire equipment comprises the low-power consumption " shut " mode" of a 150UA, analog-and digital-brilliance control, and a scanning limit register allows the user to show the 1-8 bit data, also has a detecting pattern that lets luminous of all LED.

Claims (5)

1. SCM Based humidity detector; Comprise humidity sensor, it is characterized in that described humidity sensor is connected with the A/D conversion chip; The A/D conversion chip also is connected with a single-chip microcomputer, is connected with keyboard, clock chip, alarm and light-emitting diode display on the single-chip microcomputer.

2. SCM Based humidity detector as claimed in claim 1 is characterized in that, described single-chip microcomputer adopts the AT89C51 single-chip microcomputer of 51 series.

3. SCM Based humidity detector as claimed in claim 1 is characterized in that, described A/D conversion chip adopts the ADC0809 chip.

4. SCM Based humidity detector as claimed in claim 1 is characterized in that, described clock chip adopts the DS12B887 real-time timepiece chip.

5. SCM Based humidity detector as claimed in claim 1 is characterized in that, described humidity sensor adopts HIH3610 simulation humidity sensor.

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