CN208572204U - SCM Based telephone remote control system - Google Patents

Abstract

A kind of SCM Based telephone remote control system.Existing paging frequency resource is utilized in remote control mode based on radio call, it is not required to occupy additional frequency spectrum, with seek sigh net national network, the distance that it is remotely controlled is substantially unrestricted, but the operation that controlling party is lagged behind by prosecutor movement of which, do not have real-time, and does not have very high reliability.A kind of SCM Based telephone remote control system, it includes: that/on-hook circuit (2) is plucked in master controller (1) and ring detection and simulation that it, which is formed, ring detection plucks with simulation/and on-hook circuit connect with telephone wire (8), telephone wire is also connect with DTMF decoding circuit (3) and circuit (4) respectively, DTMF decoding circuit and ring detection pluck with simulation/and on-hook circuit connect with master controller respectively, circuit is connect with alarm control circuit (5), and alarm control circuit is connect with master controller.The utility model is applied to the telephone remote control system of single-chip microcontroller.

Description

SCM Based telephone remote control system

Technical field:

The utility model relates to a kind of SCM Based telephone remote control systems.

Background technique:

With the rapid development of science and technology, various high-tech constantly pour in our life, work, also change us Understanding.All kinds of intellectual technologies for incorporating certain wisdom, walk close to us silently, and will become the heat of next development Tide.With the development of Modern Family's domestic electric appliance increased with communication line, existing communication apparatus and route pair are utilized Household electrical appliance and instrument are remotely controlled, and following development trend is had become.

Wherein, remote control technology is the control for implementing certain distance to controlled object by certain means, common mode There are wireless remotecontrol, wired remote control, infrared ray and ultra-sonic remote control etc..Wireless remotecontrol is both using radio signal to controlled Object implements far distance control.Wireless remotecontrol must inevitably occupy certain RF resources, cause electromagnetism dirty Dye；Conventional wired remote control need to carry out special wiring, increase investment；And infrared ray, ultra-sonic remote control are then limited by distance. In existing remote control mode, there are also carrier communication control means and based on the remote control mode of radio call.Carrier system passes through Power line transmits information, and which can only be confined to same electric substation, in same transformer administrative area.Therefore there is also distances Problem is of limited application.Existing paging frequency resource is utilized in remote control mode based on radio call, is not required to occupy additional Frequency spectrum.Moreover, with the national network for sighing net is sought, the distance of remote control is substantially unrestricted.But which is dynamic by prosecutor The operation for lagging behind controlling party does not have real-time, and does not have very high reliability.

Summary of the invention:

The purpose of the utility model is to provide a kind of SCM Based telephone remote control systems to utilize public telephone network Network realizes the long-range control to household electrical appliance.

Above-mentioned purpose is realized by following technical scheme:

A kind of SCM Based telephone remote control system, composition include: master controller and ring detection and simulation Pluck/on-hook circuit, the ring detection plucks with simulation/on-hook circuit connect with telephone wire, the telephone wire also respectively with DTMF decoding circuit is connected with circuit, and the DTMF decoding circuit and the ring detection are plucked/hung with simulation Electromechanical road is connect with the master controller respectively, and the circuit is connect with alarm control circuit, the report Alert control circuit is connect with the master controller, the master controller respectively with Centralized Controller and ERPROM are read-only deposits Reservoir connection.

The SCM Based telephone remote control system, the master controller are control with 89C51 single-chip microcontroller Center receives peripheral operation and instructs to form various control signals, after the 89C51 single-chip microcontroller receives off hook signal, starting Voice warning circuit issues prompt tone, and the master controller has an interface circuit, the interface circuit provide single-chip microcontroller with The interface of outside line, the 89C51 single-chip microcontroller come with the flash storage of 4KB and the chip of 256KB ram cell.

The SCM Based telephone remote control system, the circuit include that alarm signal is visited The prompt of head, the alarm signal probe uses HC-SR501 infrared induction circuit.

The SCM Based telephone remote control system, the DTMF decoding circuit is using MT8880 coding solution Code chip, and multisound and double-frequency signal is received, the MT8880 coding and decoding chip is CMOS large scale integrated chip, by Filter, decoder and control circuit three parts composition.

The SCM Based telephone remote control system, the DTMF decoding circuit, the alarm signal Circuit and ring detection and simulation pluck/and on-hook circuit in parallel is in the both ends of telephone sets for home use.

The utility model has the beneficial effects that

2. the utility model using 80C51 single-chip microcontroller and MT8870 dual-tone multifrequency decoder as core, is aided with ring detection electricity Circuit for answering, DTMF decoding circuit and home appliance control circuit are simulated to realize its function in road.User outdoors can be by any one Portion's dual-tone multifrequency phone (including mobile phone, extension), by the present apparatus, is remotely controlled.The system utilitarian design, function Versatile and flexible, high reliablity is easy to operate, can be widely applied to family or other intelligence with telephone line place Control.

The utility model can be applied to the fields such as the automation control of factory and enterprise.Telephone remote control system is by monolithic Mechanism carries out main information processing at main control module, receives peripheral operation and instructs to form various control signals, and complete for The record of various information；Additionally include ring detection module, the control of simulation dislodging machine, dual-audio DTMF decoding module and electric appliance Drive module etc..

The utility model is not required to carry out special wiring, is not take up RF resources, avoids electromagnetic pollution.Together When, since telephone line various regions are networked, existing telephone network can be made full use of, therefore remote control distance can Trans-Provincial/Municipal, or even across It is more national.System does not extend the other function of telephone device further to protrude high performance-price ratio, and all The integrated circuit and other components used all selects cheap as far as possible.Function Extension is carried out on the basis of the system simultaneously is Very easily.For example: adding message-leaving function, guest can leave a message when owner stays out, and owner can be made very square using remote control mode Just it extracts the message information in strange land；Sensor is connected in each road terminal can be realized monitoring to the environment sound；It connects certainly Predetermined information periodically can be gone to owner's beeper or particular telephone by dynamic dial-up circuit, to achieve the purpose that timed reminding owner

5. the utility model DTMF decoding circuit receives the dual-tone multifrequency letter inputted from TEL0, TEL1 using MT8880 chip Number and convert thereof into binary coding, then transport to single-chip microcontroller carry out data processing, and then realize control function.Warning note Using HC-SR501 infrared induction circuit, the information for recognizing controlled household electrical appliance in time can be allowed an operator to, product is reached To interactive and intelligence.Master controller uses AT89C51, it is a completely compatible with MCS51 and internal comes with 4KB The chip of flash storage and 256KB ram cell, therefore can be not required in addition extend EEPROM and static state RAM can be real Existing required function.

Detailed description of the invention:

Attached drawing 1 is the structural schematic diagram of the utility model.

Attached drawing 2 is matrix keyboard circuit schematic diagram.

Attached drawing 3 is 89c51 structure chart.

Attached drawing 4 is MT8880 pinouts.

Attached drawing 5 is dislodging machine flow chart.

Attached drawing 6 is alarm module software design figure.

In figure: 1 ,/on-hook circuit, 3, DTMF decoding circuit, 4, alarm signal are plucked in master controller, 2, ring detection and simulation Circuit, 5, alarm control circuit, 6, Centralized Controller, 7, ERPROM read-only memory, 8, telephone wire.

Specific embodiment:

Embodiment 1:

A kind of SCM Based telephone remote control system, composition include: master controller 1 and ring detection and simulation Pluck/on-hook circuit 2, the ring detection plucks with simulation/and on-hook circuit connect with telephone wire 8, and the telephone wire is also distinguished It is connect with DTMF decoding circuit 3 and circuit 4, the DTMF decoding circuit and the ring are detected and simulated Pluck/on-hook circuit connect with the master controller respectively, the circuit is connect with alarm control circuit 5, institute The alarm control circuit stated is connect with the master controller, the master controller respectively with Centralized Controller 6 and ERPROM Read-only memory 7 connects.

Embodiment 2:

According to SCM Based telephone remote control system described in embodiment 1, the master controller is mono- with 89C51 Piece machine is control centre, receives peripheral operation and instructs to form various control signals, and the 89C51 single-chip microcontroller receives off-hook letter After number, starting voice warning circuit issues prompt tone, and the master controller has interface circuit, and the interface circuit provides The interface of single-chip microcontroller and outside line, the 89C51 single-chip microcontroller come with the flash storage and 256KB ram cell of 4KB Chip.

The circuit includes alarm signal probe, and the prompt of the alarm signal probe uses HC- SR501 infrared induction circuit.

The DTMF decoding circuit uses MT8880 coding and decoding chip, and receives multisound and double-frequency signal, described MT8880 coding and decoding chip is CMOS large scale integrated chip, by filter, decoder and control circuit three parts group At.

/ on-hook electricity is plucked in DTMF decoding circuit, the circuit and the ring detection and simulation Road is parallel to the both ends of telephone sets for home use.

The utility model completes warning circuit function using infrared induction probe, and the alarm signal probe used is HC- SR501 can allow an operator to the information for recognizing controlled household electrical appliance in time using alarm probe, and product is made to reach interactive With intelligence.With a variety of manual control modes, sectional management is convenient, multistage control when circuit is simple, sample rate and it is complete from Innervation is answered: people enters its induction range and then exports high level, and people leaves induction range, and then automatic time delay closes high level, exports low Level.When carrying out infrared induction using HC-SR501, there are two types of triggering mode: (can wire jumper selection) a, not reproducible triggering side Formula: i.e. after inductive output high level, delay time section one terminates, and output will become low level from high level automatically；B, it repeats Triggering mode: i.e. after inductive output high level, in delay time section, if there is human body is in the activity of its induction range, output It will be always maintained at high level, being just delayed after people leaves becomes low level for high level (induction module detects the every of human body Can postpone a delay time section automatically after primary activity, and using the last time movable time as the starting of delay time Point).Infrared induction signal by probe input and line input mode enter, by microphone amplifier in chip carry from Dynamic gain adjustment, if signal amplitude can be directly entered line input in 100mV or so, alarm signal is filtered through inside It is sent in power amplifier after device, sample circuit processing by a low-pass filter, then pushes directly on external loudspeaker and put Sound alarm.

AT89C51 is the low-voltage of band 4K byte flashing programmable and erasable read-only memory FPEROM a kind of, high-performance CMOS8 bit microprocessor, is commonly called as single-chip microcontroller.The device is manufactured using ATMEL high density nonvolatile storage manufacturing technology, with work The MCS-51 instruction set of industry standard is mutually compatible with output pin.

Two kinds of basic modes of serial communication:

Around when two equipment carry out serial communication, how just can guarantee receiver receive correctly hungry character this A problem generallys use two kinds of transmission modes (i.e. communication modes) that communication two party is all approved.

Asynchronous communication mode: in asynchronous communication, character is transmitted by format.Every frame format is as shown in the figure.? In frame format, one was initiated with " 0 " before this, followed by 5-8 data, stipulated that low level, preceding, a high position is rear；Followed by surprise Even parity bit (can be omited), last position is off position " 1 ".This transmission mode it is loyal using each shellfish, stop signal establishes Synchronization between sending and receiving.Its main feature is that: do not have everybody inside a frame to be all made of fixed time interval, but Bei Zhenyu shellfish is loyal Between time interval be random.Receiver leans on the start bit of each shellfish chastity with stop position to identify that character transmission is just completely Still it is being over or a new character.This is also the connotation place of " asynchronous ".

Synchronous driving mode: synchronous driving mode is a kind of mode continuously transmitted, it need not think asynchronous communication mode that Sample will will add in each character, stop bit, but synchronization character SYN be added before the data block to be transmitted, and data It is very close to each other, using synchronous driving mode, high speed, the data transmission of large capacity may be implemented.When with synchronous driving mode, Correct in order to guarantee to receive, sender also transmits clock signal other than transmitting data simultaneously.

Baud rate:

In serial communication, there is an important index baud rate.It is defined as transmission each second binary numeral Digit (also known as bit number), using bit/second as unit.Baud rate reflects the rate of serial communication, also reflects logical to transmission The requirement in road: baud rate is higher, it is desirable that the frequency band of transmission channel is wider.

Digital display portion:

Digital display circuit uses LCD1602 display mode, and easy to use, structure is simple, does not have to additional special drive Dynamic chip.1602LCD is divided to for band backlight and without two kinds of backlight, and base controller is largely HD44780, the ratio with backlight without The thickness of backlight, if band backlight is no difference in the application.

Liquid crystal display principle:

The principle of liquid crystal display is the physical characteristic using liquid crystal, is controlled by voltage its display area, there is electricity Just there is display, can show figure in this way.Liquid crystal display is with thickness is thin, directly drives suitable for large scale integrated circuit It moves, be easily achieved the characteristics of full-color EL display, it is mobile to be widely used in portable computer, digital camera, PDA at present The various fields such as means of communication.

The display of Chinese character:

The point horizontal and vertical parity check code (one for graphically extracting Chinese character to be shown from microcomputer in advance is generally adopted in the display of Chinese character As use matrix withdraw software), each Chinese character accounts for 32B, point or so two halves, respectively account for 16B, 1,3,5 ... the right 2 of the left side, 4, 6 ... can find out the corresponding address of display random access memory according to the columns of the ranks number and every row that start display on LCD, set up cursor, The first byte of Chinese character to be shown is served, cursor position adds 1, send second byte, and line feed presses column alignment, send third word Section ... can obtain a complete Chinese character on LCD until 32B has been shown.

Keyboard interface:

(1) classification and function

The switch matrix that the keyboard of this system is made of 16 keys, it is a kind of cheap output equipment.One key Disk generally includes number key (0~9), letter key (A~Z) and some function keys.Operator can be by keyboard to calculating Machine input data, address, instruction or other control commands, realize simple human-computer dialogue.

Keyboard for computer system has two classes :-class is to encode to be closed the identification of key on chain drum, i.e. keyboard by dedicated It is hard-wired.Another kind of is nonencoded keyboard, i.e., the identification that key is keyed in and be closed on keyboard is studied carefully by software.

(2) working principle of keyboard

When not having key closure on keyboard, all lines and alignment are disconnected, and alignment Y0-Y3 is in high level.Work as hard disk On when connecing key closure, then alignment corresponding to the key and line short circuit.Such as 4 number keys when pressing closure, line Xl and column Line Y0 short circuit, the level of Y0 is determined by the current potential of X1 line at this time.If alignment is connected to the input port of microcomputer, line is connected to The delivery outlet of microcomputer makes line X0 low level (0) then under the control of microcomputer, and Xl is high level, reads alignment state.Such as Fruit Y0, Y1, Y2, Y3 are high level, then without closure key in this line of X0, if the alignment state read is not all high electricity Flat, then the key for low level alignment and the intersection X0 is in closed state；If without closure key in this line of X0, with such It pushes away, finally makes alignment X2 low level, remaining line is high level, checks in this line of X2 whether there is key closure.It is this by Row checks that the process of keyboard state is known as the single pass to keyboard column by column.CPU can take process control to keyboard scan Random fashion, CPU scans keyboard when the free time.Timing controlled mode can also be taken, at regular intervals, CPU sweeps keyboard Retouch-secondary.It can also use interrupt mode, whenever having key closure on keyboard, interrupt to CPU request, CPU responds keyboard input It interrupts, to keyboard scan, to identify which key is in closed state, and respective handling is made to key input information, CPU is to key It is closed the key determination of key on disk, can be acquired according to the state computation of line and alignment, it can also be according to line and alignment state It tables look-up and acquires.

Its method of mechanical shaking of removal key is to have key closure in differentiation to keyboard, and rear delay a period of time differentiates keyboard again State, if still there is key closure, then it is assumed that there is a key to be in the stable closure phase on keyboard, otherwise it is assumed that being the shake of key；

(4) the key method for differentiating closure key is to be scanned to the alignment of keyboard, and scanning mouth P2.7~P2.4 is successively defeated Out.

Warning note circuit:

The intelligent level of hyundai electronics, electric equipment products and equipment is continuously improved, and not only has on Human Machine Interface The visual expressions such as words identification, luminous tube indicate, picture screen is shown, and there are also the various sense of hearings to express, such as simplest " drop Drop, too " information ring sound, slightly enrich the language of a little musical sound or even employment directly to user's " speaking " etc..Alarm call number We are stored in advance in memory, and by operation keyboard, we can change alarm number.

The B key of matrix keyboard is pressed, the You are prompted with of liquid crystal meeting at this time inputs your phone number, inputs your 11 phone numbers Completion.Press the C key on matrix keyboard, so that it may check your currently stored phone number.C key is also remotely to report simultaneously Alert start button, if it is desired to remote alarming function is opened, as long as pressing C key after powering on checks alarm number, while long-range Warning function also starts simultaneously.Have a key Call on plate, when pressing this alarm keys, automatically from recall it is pre- before you keep Phone number carry out dialing alarm, at this time your mobile phone will jingle bell, buzzer also remembers alarm simultaneously！

After powering on, after having modified alarm mobile phone number, press after C key checks alarm number, infrared induction probe is just opened Beginning work please wait 20 seconds, in order to guarantee the level equalization after infrared induction powers on later if someone is in infrared induction Within 1 meter, or more recently, so that it may trigger infrared induction remote alarms, can see on liquid crystal and dial you Mobile phone, mobile phone will sound later.The fixed-line telephone number connecting with development board is dialed with phone or mobile phone, at this time long-range control panel Son can turn on automatically after 3 sound of jingle bell, at this time liquid crystal can You are prompted with press the digital keys on your mobile phone or fixed-line telephone, press 7 Key, the relay remotely controlled are connected, while buzzer rings 1 sound, presses 8 keys, and the relay remotely controlled disconnects, while buzzing Device rings 2 sound, presses # key, automatic hand-up.The number key that you press can be shown on liquid crystal.

Ring detection and simulation circuit for answering:

Ringing signal is when remote subscriber calls telephone remote control system, from programme-controlled exchange to remote control using telephone The control signaling that system is sent.

Decoding circuit:

MT8880 is CMOS large scale integrated chip, it is mainly by filter decoder and control circuit three parts group At.Filter circuit is made of signal gain and filter two parts.Externally input DTMP signal, amplifies through operational amplifier Afterwards, into double-tone filter.Double-tone filter be two six grades of switching capacities constitute high-pass and low-pass filter, it can effectively by High and low audio in dtmf signal distinguishes.The high and low audio signal being distinguished is again through high and low frequency group filter, then It is sent into the decoding circuit of chip.Decoding circuit is by Digital Detecting, a few part compositions of each ternary output of code conversion.Digital Detecting electricity Road use to input audio signal carry out digital counting mode, with determine dtmf signal frequency and verify whether with standard Dtmf signal is consistent.In the process, using the average algorithm of a set of complexity, the frequency departure of dtmf signal is provided certain Range of tolerable variance, to improve to the anti-interference ability of interfering frequency and noise.

After user inputs password on the keyboard of telephone set or presses lower button, it is logical that these information are all made of dual-audio mode Cross telephone wire sending.The main function of DTMF decoding circuit be receive from TEL0, TEL1 input touch-tone signal and by its It is converted into binary coding, single-chip microcontroller is then transported to and carries out data processing, and then realize control function [4].

This circuit using MT8880 dual-tone multifrequency decoding chip, be able to achieve the transmission of touch-tone signal (DTMF) with It receives.MT8880 is a complete double voice multi-frequency receiver circuit, has band separation filter and digital decoding function.Filter Wave device part is using switched capacitor technique for that will dial audio Signal separator into high frequency group signal and low frequency group signal.It is decoding All 16 kinds of dual-tone multifrequency audios pair are detected in device using digital counting technology, and they are weaved into 4 codes.Since on piece is standby There are differential input amplifier, clock oscillator and tri-state to latch bus interface, therefore outward element number minimize.When user exists Password is inputted on the keyboard of telephone set or presses these information of after control button and is all made of dual-tone multifrequency mode passes through telephone wire hair Out.DTMF dual-tone multifrequency decoding circuit is the key component of system, and major function is information to be extracted from telephone network, and will be System dialing information serves telephone network, and then realizes control function.Inputted using the dual-tone multifrequency decoding chip of phone-specific, The decoding for exporting double-audio signal, is more commonly used method.Using integrated circuit, not only peripheral circuit is simple, and reliability Height, signal become binary code by conversion convenient for single-chip microcontroller reading.Ordinary phone dual-tone multifrequency decoder has 8870,8880, 8888 etc., MT8880 are to apply CMOS technology with the monolithic DTMF modem of detection call filter and make it have Low-power consumption and high reliability.Internal counter provides burst mode, and this tone-burst can be sent with accurate timing.It may be selected to exhale It was range filter, so as to the single-tone in microprocessor analysis calling procedure.Offer standard microcomputer interface and 6800 series are compatible, And allow one status register of microcomputer addressing, two control registers and two data registers.In conjunction with this design requirement We select MT8880 to complete subfunction.

When MT8880 is as DTMP transmitter, tetrad code is latched at transmission data on data/address bus DO-D3 In register, the dtmf signal frequency of transmission is generated by the crystal oscillation fractional frequency of 3.58MHz.Frequency divider is isolated from base frequency first The sine wave line count device of 8 different frequencies isolates one in such a way that eight take two according to the data in transmitting data register A high-frequency signal and a low frequency signal, make D/A conversion through switching capacity, synthesize dtmf signal in adder, and from TONE End output [5].

The realization of signal sound judgement:

The principle of signal sound judgement is: since the frequency of the dialing tone of phone system signal sound, ring-back tone and busy tone is The sine wave of 425-475Hz, only break-make ratio is different and has apparent difference in time (dialing tone continuous signal: busy tone is 0. 35s is logical, and 0.35s is disconnected, and ringback tone is logical for 1S, and 4S is disconnected).Judge signal sound, should will handle the MT8880 of dtmf signal first Chip is set as call treatment mode, and when selecting call processing model formula, MT8880 cannot be used to detect dtmf signal. The call treatment filter of MT8880 is a bandpass filter, and passband is 300-510 Hz, when signal input part has signal When sound inputs, if MT88801 makees just to export a high level in IRQ foot in CP mode.Make the various letters in telephone call Number sound is filtered through MT8880, square wave is obtained after clipping, and gone out by the IRQ elm of MT8880.Then to the irq signal of MT8880 output 5S is counted, the count upper-limit of dialing tone is (450+25) × 5-2375, and the counting lower limit of dialing tone is (450-25) × 5-2175. Similarly, the count range of busy tone is 1041-1212, and the count range of ring-back tone is 425-475, and the counting of no signal should be 0.

With interface microcontroller:

MT8880 uses the microprocessor interface of standard, so that sending and receiving for signal becomes simple. There are 5 registers inside MT8880, this 5 registers can be divided into data temporary register, transmitting-receiving control register and transceiver Status register.Data temporary register has reception data register and transmitting data register reception data register to be used for The virtual value that storage last time receives is a read-only register；Data decision in transmitting data register will be sent Double-audio signal frequency composition, we can only write personal data into transmitting data register.Program beginning and power-up, [6] are initialized to control register when system reset, on software.

Hardware interface circuit:

P2. the P2. 4-P2.7 that O-P2.3 meets the DO-D3: single-chip microcontroller of people MT8880 respectively connect respectively MT8880 KSO, CS,R/W,CK.One external signal IRQL of the every reception of MT8880 is lower once by height, and single-chip microcontroller is during interruption by data DO- D3 reads in internal data memory from MT8880, interrupts after the completion of servicing.Roi is got higher by Was, is started reception next signal and (is set Timing should be noted that interrupt service time is less than dialing internal digital time interval).When external publication order.8051 by internal number PO mouthfuls are transmitted to according to DO-D3.Then the DO-D3 of MT8880 is sent to from PO oral instructions again, data are in MT8880 through two-tone modulation Dtmf signal is exported from TONE foot afterwards.The chip selection signal CSI of MT8880 control line is connected by NAND gate with P2.5, P2.5=l, Choose MT8880,2716 clock signal of P2.5-0 hit program memory is provided by 8051 signal: read-write R/W by P2.6 is provided, and register chip selection signal is provided by P2.7.OSCI, OSC2 connect 3.528MHz crystal oscillator.The external RC integral in 18 and 19 ends Circuit makes decoding data generate a delay, CPU can correctly be read.

Online implementing/offline/reset circuit:

When dtmf signal decoding circuit and voice warning circuit are connected to subscriber's telephone line, we claim system to be in online (Odine) state: conversely, when dtmf signal decoding circuit and voice warning circuit and subscriber's telephone line disconnect, we claim be System is in offline (Offline) state.Only when telephone remote control system works, system just should be at online state.This The purpose that sample is done is other high-voltage noises on High voltage ring signals (up to 120VMS) and route when avoiding user's calling system Harm is generated to dtmf signal decoding circuit and voice warning circuit.The realization of online/offline/reset function, and by system What hardware circuit and software were realized jointly.

Online implementing circuit:

The function of online implementing circuit is the ring ringing signal for detecting programme-controlled exchange and sending, and then passes through interrupt mode Notify AT89S82 single-chip microcontroller, according to software set, closed system is online/offline/reseting switch circuit, open dtmf signal solution The connection of code circuit and voice warning circuit and telephone loop.The major part of online circuit is bell flowing detecting circuit.Ringing-current Signal is the control from programme-controlled exchange to telephone remote control system that send from when remote subscriber calls telephone remote control system Signaling processed.

Offline/reset circuit:

After the completion of user operates telephone remote control system, issuing terminates order, in AT89S82 single-chip microcontroller disconnection system Line/offline/reseting switch circuit, system off-line.If user occur maloperation or forget send terminate order, system according to Software set disconnects online implementing/offline/reseting switch circuit, makes system off-line, and initializers setting [8].

Liquid crystal display and state display module:

System display module select liquid crystal display block, for show the selected electric appliance channel of user, electrical work state, The telephone number transferred to when emergency.Status display circuit is the current working status and operation instruction for indicating each channel.It should Module is mainly made of 51 ~ LED5 of Light-emitting diode LED.LED1 ~ LED5 is used to refer to the working condition of circuit, light-emitting diodes It indicates that the electric appliance on the access has connected power supply when managing bright, indicates that the road electric appliance is turned off when going out.

Electrical equipment control:

No. eight electric appliances are controlled by the P2 mouth of AT89C51.The performer of control circuit uses relay.Work as single-chip microcontroller When realizing the control to electric appliance, by P2 mouthfuls of sending control signals and 8 relays are driven after triode amplifies, to control The on-off of No. 8 electric appliances is made.

Software design:

Simulate circuit for answering and simulation on-hook circuit composition simulation dislodging machine module.It is by diode D1 ~ D4, triode V1, V2 and four resistance compositions.D1 ~ D4 is rectifier bridge, and the alternating current on telephone line is switched to direct current；When to V2 base stage one Triode V2(NPN when high level) conducting, V1(PNP) base stage and the collector of V2 be connected through resistance R2, V2 conducting is to make The level for obtaining the base stage of V1 becomes low level to make V1 be connected, and the collector of V1 forms circuit through resistance R3.Because of program-controlled electric Words interchanger to the response of phone off-hook be telephone wire loop current become larger suddenly be about 30mA electric current, interchanger detects back Road electric current, which becomes larger, is considered as telephone set off-hook.When the base stage of V2 is low level, i.e. V2, V1 cut-off telegram in reply resistive is big, electricity Talk about line loop electric current and be much smaller than 30mA, interchanger detects that loop current becomes smaller and is considered as telephone set on-hook, namely be System communication terminates [9].

This secondary design is introduced the development of China and the comparison of various remote control technologies since phone, and then expands to electricity Talk about the relatively prominent advantage of remote control.Thus enter telephone remote technology in the application of real life and prospect.? In this secondary design, following several respects work has mainly been done:

(1) detailed introduction has been done to telephone remote system design principle and feasibility, and has constructed each system The basic model of module.

On the basis of constructed in hardware basic ideas, basic hardware circuit is devised, and illustrates each hardware circuit Working principle and component Selecting All Parameters.Wherein hardware circuit part includes that ring detecting circuit, simulation circuit for answering, double-tone are more Frequency decoding circuit.

Software design part be then according to the process in programming flowchart step by step write program, design this remote control The groundwork of the control program of device is telephone signal to be detected and received user instructions the work of control household electrical appliance Make.

Emulation part carries out the emulation of partial circuit using protues8.0, properly selects element instead of in simulation software No component, in the hope of reaching the analysis of circuit feasibility.

Phone line traffic control household electrical appliances, its essence is remotely realized by double-audio signal that telephone wire uses to various families The control of electrical appliance.Phone line traffic control appliance system has been designed and produced, it can be achieved that right using single-chip microcontroller and double-audible frequency chip The control of the different household electrical appliances on up to eight tunnels is finally able to achieve to the arbitrarily switch of household electrical appliances all the way.In terms of test result, and require to set Evaluation has reached consistent.

Claims (6)

1. a kind of SCM Based telephone remote control system, composition includes: master controller and ring detection and simulation pluck/ On-hook circuit, it is characterized in that: the ring detection pluck with simulation/on-hook circuit connect with telephone wire, the telephone wire is also It is connect respectively with DTMF decoding circuit and circuit, the DTMF decoding circuit and the ring are detected and simulated Pluck/on-hook circuit connect with the master controller respectively, the circuit is connect with alarm control circuit, described Alarm control circuit connect with the master controller, the master controller respectively with Centralized Controller and ERPROM only Read memory connection.

2. SCM Based telephone remote control system according to claim 1, it is characterized in that: the master controller Using 89C51 single-chip microcontroller as control centre, receives peripheral operation and instruct to form various control signals, the 89C51 single-chip microcontroller connects After receiving off hook signal, starting voice warning circuit issues prompt tone, and the master controller has interface circuit, and described connects Mouthful circuit provides the interface of single-chip microcontroller and outside line, the 89C51 single-chip microcontroller come with 4KB flash storage and The chip of 256KB ram cell.

3. SCM Based telephone remote control system according to claim 1 or 2, it is characterized in that: the alarm Signal circuit includes alarm signal probe, and the prompt of the alarm signal probe uses HC-SR501 infrared induction circuit.

4. SCM Based telephone remote control system according to claim 1 or 2, it is characterized in that:

The DTMF decoding circuit uses MT8880 coding and decoding chip, and receives multisound and double-frequency signal, the MT8880 Coding and decoding chip is CMOS large scale integrated chip, is made of filter, decoder and control circuit three parts.

5. SCM Based telephone remote control system according to claim 3, it is characterized in that: the DTMF is decoded Circuit, the circuit and described ring detection and simulation pluck/and on-hook circuit in parallel is in the two of telephone sets for home use End.

6. SCM Based telephone remote control system according to claim 4, it is characterized in that: the DTMF is decoded Circuit, the circuit and described ring detection and simulation pluck/and on-hook circuit in parallel is in the two of telephone sets for home use End.