CN104207616A

CN104207616A - Automatic controller of multi-media classroom curtain

Info

Publication number: CN104207616A
Application number: CN201410479300.2A
Authority: CN
Inventors: 张静; 武艳; 李威
Original assignee: Suzhou Institute of Trade and Commerce
Current assignee: Suzhou Institute of Trade and Commerce
Priority date: 2014-09-19
Filing date: 2014-09-19
Publication date: 2014-12-17

Abstract

The invention relates to an automatic controller of a multi-media classroom curtain. The controller is formed by a power module, a motor drive module, a display module, a photosensitive module, a clock module and a single chip microcomputer, wherein the power is supplied through the power module, a signal is collected by the photosensitive module and is transmitted to the single chip microcomputer, and the single chip microcomputer controls the motor drive module to drive an executive motor to rotate forward and reverse, so that the curtain is opened and closed. The technical scheme of the invention is adopted, the states of the curtain are different according to the difference of intension of illumination; when illumination is stronger, the curtain is closed; when the light ray is moderate, the curtain is half-opened and half-closed; when the light ray is weaker, the curtain is all opened; the curtain is automatically closed at six o'clock in the evening, so that the control speed is quick, the reliability is high, the power consumption is low, and the volume is small.

Description

A kind of multi-media classroom curtain automatic controller

Technical field

The present invention relates to automatic field, be specifically related to a kind of multi-media classroom curtain automatic controller.

Background technology

Along with the prosperity of information technology, the progress of science and technology, multi-media classroom has become requisite educational aid, and even medium universities and colleges of each colleges and universities all bring into use multimedia to impart knowledge to students.Because multimedia has figure, literary composition, sound luxuriantly even have movable shadow feature like this, have many is characteristics and function valuable especially for education, teaching process, and these characteristics and function are not available for other media (such as magic lantern, projection, film, recording, video recording, TV etc.) or not exclusively possess.At present in use Multimedia Teaching, the problem that generally can run into was exactly upper class hour on daytime, light can cause too by force reflective, the unsharp situation of multimedia projection, and for this situation, the present invention devises the controller controlling the keying of curtain and the amplitude of keying according to period illumination.

Summary of the invention

The object of the invention is to overcome prior art Problems existing, a kind of multi-media classroom curtain automatic controller is provided.

For realizing above-mentioned technical purpose, reach above-mentioned technique effect, the present invention is achieved through the following technical solutions:

A kind of multi-media classroom curtain automatic controller, comprise single-chip microcomputer, also comprise power module, photosensitive module, clock module, display module, travel switch and motor drive module, the input of described power module, photosensitive module, clock module electrical connection single-chip microcomputer, the output of described display module, travel switch, motor drive module electrical connection single-chip microcomputer.

Further, described single-chip microcomputer adopts STC89C51 chip.

Further, described photosensitive module comprises photo resistance and AD conversion module.

Further, described clock module adopts DSl302 chip.

Further, described display module adopts 1602 character mode lcds.

Further, described motor drive module adopts L298 driving chip.

The invention has the beneficial effects as follows:

Adopt technical solution of the present invention, different according to the intensity of illumination, the state opening curtain is also different, when illumination is stronger, curtain is closed, and light is moderate, the half-open semi-closure of curtain, light is more weak, and curtain is all opened, six o'clock of evening arrives, curtain is closed automatically, and control rate is fast, and reliability is strong, low in energy consumption, volume is little.

Accompanying drawing explanation

Fig. 1 is structural representation of the present invention;

Fig. 2 is circuit diagram in power module;

Fig. 3 is interface microcontroller circuit diagram;

Fig. 4 is photosensitive circuit figure;

Fig. 5 is the circuit diagram of motor drive circuit;

Fig. 6 is display circuit figure;

Fig. 7 is travel switch structure circuit diagram;

Fig. 8 is control action flow chart.

Detailed description of the invention

Below with reference to the accompanying drawings and in conjunction with the embodiments, describe the present invention in detail.

As shown in Figure 1, a kind of multi-media classroom curtain automatic controller, comprise single-chip microcomputer, also comprise power module, photosensitive module, clock module, display module, travel switch and motor drive module, the input of described power module, photosensitive module, clock module electrical connection single-chip microcomputer, the output of described display module, travel switch, motor drive module electrical connection single-chip microcomputer.

As shown in Figure 2, the power supply after rectification is carried out ripple filtering by the filter circuit that in the present embodiment, power module is made up of electric capacity, the interference ripple that rejection frequency is higher.Again through a voltage stabilizing chip L7805 and the convertible 5V of going out power supply be that back-end circuit is powered.Causing native system to quit work for preventing multi-media classroom power outage to make troubles to user, during design, having standby lithium pond, continue as systems stay when having a power failure and power.

Described single-chip microcomputer adopts STC89C51 chip, as shown in Figure 3, it is primarily of power circuit, reset circuit, clock oscillation three part composition, the present embodiment needs set and display perpetual calendar and local zone time, DS1302 clock chip is selected to carry out the time of control system, clock circuit is made up of DS1302, crystal oscillator and two electric capacity, three-polar output pin access single-chip microcomputer, single-chip microcomputer can transfer interior data by software, and it is controlled, realize to year, month, day, Sunday, time, minute, second carries out timing, and has leap year compensate function.

Described photosensitive module comprises photo resistance and AD conversion module, and as shown in Figure 4, the present embodiment selects photo resistance and a/d converter to control.It is made up of an ADC0808, photo resistance and a pull-up resistor.When there being illumination to be mapped in photo resistance, resistance variations is converted into voltage change, when voltage signal imports IN0 into, namely when channel selecting address is effective, ale signal one occurs, address is just latched at once, and after at this moment conversion starting signal follows ALE closely, (or the while of with ALE) occurs.Successive approximation register SAR resets by the rising edge of START, 2 μ s after this rising edge add in 8 clock cycle (indefinite), eoc signal by step-down level, to indicate conversion operations well afoot, until convert rear EOC to uprise level again.After microprocessor receives the eoc signal becoming high level, just send OE signal immediately, open triple gate, read transformation result, namely voltage signal is converted into data signal.

Described display module adopts 1602 character mode lcds, as shown in Figure 2, adopts LCD1602 to carry out data display, be made up of 10K exclusion and 1602,1602 each pins are all connected to single-chip microcomputer end, and the data such as illumination, time export data through Single-chip Controlling, show by 1602.

Described motor drive module adopts L298 driving chip, as shown in Figure 5, this circuit utilizes the interrupt techniques of single-chip microcomputer and the PWM ripple of timer technology adjustable duty cycle, pwm pulse modulation voltage controls the speed of motor by L298, in the middle of practical application, the voltage of the voltage ratio VCC of VSS is high, otherwise there will be out-of-control phenomenon.The IN1 of L298 drives input pin to connect the P2.6 mouth of single-chip microcomputer, IN2 drives input pin to connect the P2.7 mouth of single-chip microcomputer, this chip have two TTL/CMOS hold concurrently ordinary telegram hold input, there is good antijamming capability, 4 outputs have larger current driving ability, can drive two dc motors or a stepper motor easily.

As shown in Figure 7, the positive and negative of drive motors is needed to transfer the opening and closing controlling curtain in the present embodiment, need curtain in the top simultaneously, centre, the top position stop, therefore travel switch is selected to control curtain in corresponding stopping, touch when curtain arrives a certain position push rod down Compress Spring make normally opened contact close, P2.3, P2.4, P2.5 corresponding port becomes low level, and motor stops, and curtain stops in relevant position.

Principle of the present invention:

Arrive when six o'clock of morning, curtain is opened automatically, and different according to the intensity of illumination afterwards, the state opening curtain is also different, and when illumination is stronger, curtain is closed; Light is moderate, the half-open semi-closure of curtain; Light is more weak, and curtain is all opened, and six o'clock of evening arrives, and curtain is closed automatically; Conveniently control, perpetual calendar and the intensity of illumination analogue value are shown by liquid crystal display by the design, thus the opening and closing of more intuitive control curtain; As shown in Figure 8, main program is primarily of clock submodule, photosensitive submodule, motor submodule composition, and clock submodule detects timing, if morning, timing arrived, then motor rotates forward (curtain is all opened); Time does not arrive, and motor is motionless.Photosensitive submodule detects intensity of illumination and controls the electric machine rotation number of turns, i.e. curtain opening and closing degree afterwards; If timing arrives at dusk, then motor reversal (curtain Close All).

The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims

1. a multi-media classroom curtain automatic controller, comprise single-chip microcomputer, it is characterized in that, also comprise power module, photosensitive module, clock module, display module, travel switch and motor drive module, the input of described power module, photosensitive module, clock module electrical connection single-chip microcomputer, the output of described display module, travel switch, motor drive module electrical connection single-chip microcomputer.

2. multi-media classroom curtain automatic controller according to claim 1, is characterized in that, described single-chip microcomputer adopts STC89C51 chip.

3. multi-media classroom curtain automatic controller according to claim 1, it is characterized in that, described photosensitive module comprises photo resistance and AD conversion module.

4. multi-media classroom curtain automatic controller according to claim 1, is characterized in that, described clock module adopts DSl302 chip.

5. multi-media classroom curtain automatic controller according to claim 1, it is characterized in that, described display module adopts 1602 character mode lcds.

6. multi-media classroom curtain automatic controller according to claim 1, is characterized in that, described motor drive module adopts L298 driving chip.