CN110708221A - A home remote control system and method - Google Patents

Abstract

The invention discloses a home remote control system and method, wherein the system comprises a single-chip microcomputer and a control switch corresponding to a household appliance, the output end of the single-chip microcomputer is connected to the control switch, and is used to control the work of the household appliance, and the control system further comprises a A ringing detection circuit, a DTMF decoding circuit, and a voice reminder circuit in the telephone landline. The ringing detection circuit is used to detect the ringing signal of the telephone landline. and an off-hook circuit, the output end of the DTMF decoding circuit is connected to the single-chip microcomputer, and the DTMF decoding circuit and the voice reminder circuit are respectively connected to the telephone line through the off-hook circuit. The present invention realizes the control of household appliances by means of the user dialing the fixed telephone at home and inputting the keys according to the voice prompt. This method has a simple structure and is convenient to control. By improving the internal circuit structure of the telephone, the intelligent control of the household appliances is increased. degree.

Description

A home remote control system and method

technical field

The invention relates to the field of intelligent home control, in particular to a home remote control system and method for controlling home appliances based on a home fixed telephone.

Background technique

With the development of smart home control, remote control of electrical work in the home through remote or automatic methods has become the development direction of smart home remote control. In the prior art, the method of setting up a cloud server is often used to achieve, and the control signal is sent through the cloud server. To realize the control of electrical appliances in the home. However, setting up a cloud platform or registering a cloud platform account is still inconvenient for users. Based on the prior art, the present application proposes a new smart home appliance control method, which uses a fixed telephone and a telephone network in the home to realize signal transmission, thereby realizing remote signal transmission to control the operation of household appliances.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the deficiencies of the prior art, and to provide a home remote control system for realizing remote control of household appliances through a home fixed telephone.

In order to achieve the above purpose, the technical solution adopted in the present invention is as follows: a home remote control system, comprising a single-chip microcomputer and a control switch corresponding to a household appliance, wherein the output end of the single-chip microcomputer is connected to a control switch for controlling the work of the household appliance, and the control The system also includes a ringing detection circuit, a DTMF decoding circuit, and a voice reminder circuit arranged in the telephone landline. The ringing detection circuit is used to detect the ringing signal of the telephone landline. The voice reminder circuit and the on-hook circuit are respectively connected, the output end of the DTMF decoding circuit is connected with the single-chip microcomputer, and the DTMF decoding circuit and the voice reminder circuit are respectively connected to the telephone line through the on-hook circuit.

The off-hook circuit connects the telephone line with the DTMF decoding circuit and the voice reminder circuit according to the control signal of the single-chip microcomputer.

The on-hook circuit includes an MC1413 chip, a triode, and a relay. The input end of the MC1413 chip is connected to the single-chip microcomputer, the output end of the MC1413 chip is connected to the base of the triode, the transmitter of the triode is grounded, and the collector of the triode passes through the relay. The coil is connected to the power supply VCC, and the normally open contact of the relay is set between the telephone line and the DTMF decoding circuit as well as the telephone line and the voice reminder module.

The ringing detection circuit includes a bridge rectifier module, an optocoupler circuit, and an AND gate circuit. The telephone line is connected to the input end of the bridge rectifier circuit. The input end of the coupling circuit is connected, the output end of the optocoupler circuit is connected to one input end of the AND gate circuit, the other input end of the AND gate circuit is grounded, and the output end of the AND gate circuit is connected to the single-chip microcomputer.

The voice reminder circuit includes an ISD2560 chip, which is used to output a preset voice reminder signal according to the input control signal of the single-chip microcomputer.

A control method for a home remote control system, comprising the following steps:

Step 1: The single-chip microcomputer detects the ringing signal through the ringing detection circuit and counts the number of rings. When the number of rings is greater than the set number of times, the connection between the telephone line and the voice reminder module is connected through the off-hook circuit;

Step 2: The voice reminder module sends a voice signal to remind the other party to input the verification password to the telephone line and is received by the caller;

Step 3: The single-chip microcomputer receives the data transmitted from the telephone line through the DTMF decoding circuit, decodes it and sends it to the single-chip computer, and after the password is correct, the single-chip microcomputer drives the voice reminder module to request the input of the digital keys corresponding to the controlled household appliances through the telephone line. ;

Step 4: The single-chip microcomputer obtains the signal from the telephone line through the DTMF decoding circuit to obtain the number and determines the household appliance corresponding to the number;

Step 5: The single-chip microcomputer controls the power on and off of the household appliances;

Step 6: The single-chip microcomputer controls the on-hook circuit to perform the on-hook operation.

When the single-chip microcomputer obtains the key signal from the telephone line through the DTMF decoding circuit, when the key signal is not received within the set time interval, the single-chip computer controls the on-hook circuit to control the on-hook.

In step 3: the DTMF decoding chip MT8870 will convert the key signal input by the user into a corresponding digital signal, and send it to the single-chip microcomputer for judgment; if the password is incorrect, the single-chip microcomputer drives the voice reminder module to transmit a voice prompt to re-input. When the number of times is set, the system will automatically hang up.

The advantages of the present invention lie in that the control of the household appliances is realized by the user dialing the fixed telephone at home and inputting the keys according to the voice prompt. This method has a simple structure and is convenient to control. By improving the internal circuit structure of the telephone, the telephone line It is convenient and reliable to carry out communication and dissemination of data to realize the control of household appliances, which increases the degree of intelligent control of household appliances.

Description of drawings

Below is a brief description of the content expressed in each of the drawings in the description of the present invention and the labels in the drawings:

Fig. 1 is the control system structure principle diagram of the present invention;

Fig. 2 is the ringing detection principle diagram of the present invention;

3 is a schematic diagram of a decoding circuit of the present invention;

FIG. 4 is a schematic diagram of an off-hook circuit of the present invention;

FIG. 5 is a schematic diagram of the power-on and power-off control of the household appliance of the present invention.

Detailed ways

The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and through the description of the preferred embodiments.

As shown in Figure 1-5, a home remote control system includes a single-chip microcomputer and control switches corresponding to household appliances. The output end of the single-chip microcomputer is connected to the control switch to control the work of the household appliance. The control switch can use a relay to control the household appliance. The power supply and power off to achieve for. The control system also includes a ringing detection circuit, a DTMF decoding circuit, and a voice reminder circuit arranged in the telephone landline. The ringing detection circuit is used to detect the ringing signal of the telephone landline. The reminding circuit, the on-hook circuit, the output end of the DTMF decoding circuit are connected to the single-chip microcomputer, and the DTMF decoding circuit and the voice reminding circuit are respectively connected to the telephone line through the on-hook circuit.

The on-hook circuit connects the telephone line with the DTMF decoding circuit and the voice reminder circuit according to the control signal of the single-chip microcomputer. The on-hook circuit includes MC1413 chip, triode, and relay. The input end of the MC1413 chip is connected to the single-chip microcomputer, the output end of the MC1413 chip is connected to the base of the triode, the transmitter of the triode is grounded, and the collector of the triode passes through the coil of the relay. Connect the power supply VCC, the normally open contact of the relay is set between the telephone line and the DTMF decoding circuit, as well as the telephone line and the voice reminder module.

The ringing detection circuit includes a bridge rectifier module, an optocoupler circuit, and an AND gate circuit. The telephone line is connected to the input end of the bridge rectifier circuit. The output end of the optocoupler circuit is connected to one of the input ends of the AND gate circuit, the other input end of the AND gate circuit is grounded, and the output end of the AND gate circuit is connected to the single-chip microcomputer.

The voice reminder circuit includes the ISD2560 chip, which is used to output the preset voice reminder signal according to the input control signal of the single-chip microcomputer.

A control method of a home remote control system of the present application includes the following steps:

Step 1: The single-chip microcomputer detects the ringing signal through the ringing detection circuit and counts the number of rings. When the number of rings is greater than the set number of times, the connection between the telephone line and the voice reminder module is connected through the off-hook circuit;

Step 2: The voice reminder module sends a voice signal to remind the other party to input the verification password to the telephone line and is received by the caller;

Step 3: The single-chip microcomputer receives the data transmitted from the telephone line through the DTMF decoding circuit, decodes it and sends it to the single-chip computer, and after the password is correct, the single-chip microcomputer drives the voice reminder module to request the input of the digital keys corresponding to the controlled household appliances through the telephone line. ;

Step 4: The single-chip microcomputer obtains the signal from the telephone line through the DTMF decoding circuit to obtain the number and determines the household appliance corresponding to the number;

Step 5: The single-chip microcomputer controls the power on and off of the household appliances;

Step 6: The single-chip microcomputer controls the on-hook circuit to perform the on-hook operation.

When the single-chip microcomputer obtains the key signal from the telephone line through the DTMF decoding circuit, when the key signal is not received within the set time interval, the single-chip computer controls the on-hook circuit to control the on-hook.

In step 3: the DTMF decoding chip MT8870 will convert the key signal input by the user into a corresponding digital signal, and send it to the single-chip microcomputer for judgment; if the password is incorrect, the single-chip microcomputer drives the voice reminder module to transmit a voice prompt to re-input. When the number of times is set, the system will automatically hang up.

The invention introduces a remote control system for household appliances based on a telephone network and a single-chip microcomputer. With the invention, the user can conveniently remotely control the electrical appliances in the home by making a phone call. For example, the user can turn on the rice cooker, air conditioner and water heater at home in advance by phone before going off work. When I get home from get off work, the rice has been cooked, the room temperature is just right, and the water in the water heater has been heated, which is both comfortable and convenient. The composition and control principle of the invention are described in detail below.

As shown in Figure 1, ISD2560 is a voice storage and recording chip. When the user needs to control the home appliances, he can use the mobile phone or fixed phone to dial the home phone number, and the ringing signal is transmitted to the home phone through the telephone network. At this time, the ringing detection circuit starts to detect the ringing current signal, and a ringing current signal generates a pulse. , the pulse is sent to the single chip AT89C51 for counting. When someone answers or the number of rings is not more than 6 times (which can be set by software), the control system considers it to be a telephone call signal or misoperation and does not act to avoid interfering with normal telephone services. When the number of rings is greater than 6 times, the system considers it to be the control of sockets and electrical appliances, and the single-chip microcomputer controls the off-hook and starts the voice prompt circuit (ISD2560) to issue a prompt tone, requiring the user to enter a password. The DTMF decoding chip MT8870 will convert the key signal input by the user into the corresponding digital signal, and send it to the single-chip microcomputer for judgment. If the password is incorrect, it will be prompted to re-enter it by voice. When the number of input exceeds 3 times (which can be set by the software), the system will hang up automatically; if the password is entered and confirmed by the system to be correct, the voice prompts the user for the number keys corresponding to each operation. , after confirming that the operation is completed, the system automatically hangs up. When the user dials the phone key, the time interval between key presses cannot exceed a certain time (generally set to 5 to 10 seconds). When the set time is exceeded, the system will also hang up automatically.

The central processing unit of this system is AT89C51, and all control commands are issued by it. After the system is powered on and reset, the CPU continuously detects the state of the ringing signal. When a valid ringing signal is detected, the counting procedure is started. After counting to the set number of rings, the CPU sends out the off-hook signal, the control circuit automatically goes off-hook and sends out the off-hook prompt tone, prompting the user to input the password. At the same time, the single-chip microcomputer detects the STD signal sent by the MT8870. When the STD signal is valid, it reads the instruction code from the MT8870 and compares it with the preset password. If it is inconsistent, it will hang up automatically. If they are consistent, the user can perform further operations according to the voice prompt of the system, such as checking the working status of the electrical appliance plugged into the socket, or setting its status.

The ringing detection circuit is shown in Figure 2. When the ringing signal is input through C21 and C22, the 75±15V, 25Hz AC voltage on the telephone line is bridge rectified by D4, filtered by C8, and the DC voltage stabilized by D5 makes the optocoupler conduct, and the +5V power supply The voltage charges the capacitor C13 through the photocoupler, R22 and D3. When the voltage on the capacitor is charged to the gate voltage of the 74L08, the 74LS08 is turned on, and the analog signal is converted into a digital pulse signal, and then input to the T0 pin of the AT89C51 microcontroller for processing. count. Each ringing current signal generates a pulse, and the microcontroller counts it once. When the count reaches 6 times, the P2.1 pin of the AT89C51 is issued a low level through software to complete the off-hook action.

The decoding circuit is shown in Figure 3. The function of the DTMF decoding circuit is to receive the dual-tone multi-frequency signal input from the phone and convert it into binary code, and then input it to the single-chip microcomputer for data processing, and then realize the control function. The MT8870 is a complete DTMF receiver that can be used as an interface separation filter and digital decoder. The filter part is used to convert the high and low filter groups of the capacitor, and the decoder is used for digital inquiry and converts the detected 16-bit DTMF signal into a 4-bit code. The minimum value of the external count is preset by various input amplifiers, clock oscillators, and latched three-bit state values. The signal on the telephone line is coupled by capacitor C23, attenuated by R13, R14 and input to the 2 feet and 3 feet of MT8870 for decoding, and converts the telephone dialing signal into the corresponding binary code. After the user operates the keys on the keyboard of the telephone, the information is sent out through the telephone line in a dual tone mode.

ISD2560 chip is only used for voice prompting and monitoring circuits. ISD series voice chips avoid the quantization noise and distortion of general solid voice circuits, and can better reproduce the natural effect of voice. The ISD2560 supports the user's direct address operation on the voice information, so that the designer does not need to know the address when operating and combining the voice information segments, but only needs to know the relative serial numbers of the voice segments. The operation mode of ISD2560 is divided into 6 different modes according to the different combinations of the high and low levels of pins A1 to A8 to achieve different functions. When the monitoring function is activated, it is only necessary to change the level of the corresponding port to convert the sound of the scene into a level signal and send it to the telephone line. The circuit is simple and easy to use.

Pick up / hang up circuit as shown in Figure 4. Usually when the phone hangs up, the two telephone lines are in an open circuit state, and the line voltage is applied to both ends of the ringing circuit of the phone. When off-hook, the ringing circuit is disconnected and the telephone line is connected. When making a call, the high-voltage ringing signal from the telephone line generates a pulse signal through the ringing current detection circuit, and sends it to the P3.5 port of the single-chip microcomputer for ringing pulse counting. When the number of rings reaches 6 times, the microcontroller program controls the P2.1 port to output a low level, and then the high level of the P2.1 port is sent to the 1 pin of the MC1413 integrated switch drive circuit for amplification, and the 16 pin outputs a high level It is sent to the base of the triode 9013 to make the triode saturate and conduct. At this time, the +5V power supply is grounded through the relay coil and the triode, and the relay coil is energized, so that the normally open electric shock of the relay is closed, and the phone is connected. When the user enters the wrong password or the operation ends, the system software controls the P2.1 port to output a high level, and through the MC1413 drive circuit, pin 16 outputs a low level, the control 9013 is turned off, the relay coil is de-energized, and the normally open contact is disconnected , the telephone line is in the open state again, and the hang-up is realized.

The power-on and power-off control circuit of household appliances is shown in Figure 5. The design adopts the control of the power socket with a relay to realize the final control of the household appliances. Electrical appliances such as rice cookers, water heaters, and air conditioners only need to be plugged in, and the main control single-chip microcomputer The on-off of the electrical power supply can be controlled by controlling the relays in the socket. This method is simple and easy to implement.

Obviously, the specific implementation of the present invention is not limited by the above-mentioned manner, as long as various insubstantial improvements made by adopting the method concept and technical solution of the present invention are all within the protection scope of the present invention.

Claims (8)

1. The utility model provides a remote control system of family, includes the control switch that singlechip, domestic appliance correspond, singlechip output connection control switch for control domestic appliance's work, its characterized in that: the control system also comprises a ringing detection circuit, a DTMF decoding circuit and a voice reminding circuit which are arranged in the telephone base, wherein the ringing detection circuit is used for detecting ringing signals of the telephone base, the output end of the ringing detection circuit is connected with the single chip microcomputer, the output end of the single chip microcomputer is respectively connected with the voice reminding circuit and the hook-and-loop circuit, the output end of the DTMF decoding circuit is connected with the single chip microcomputer, and the DTMF decoding circuit and the voice reminding circuit are respectively connected with a telephone line through the hook-and-loop circuit.

2. A home remote control system as claimed in claim 1, wherein: the on-off hook circuit is connected with the telephone line, the DTMF decoding circuit and the voice reminding circuit according to the control signal of the single chip microcomputer.

3. A home remote control system as claimed in claim 2, wherein: the on-off circuit comprises an MC1413 chip, a triode and a relay, wherein the input end of the MC1413 chip is connected with a single chip microcomputer, the output end of the MC1413 chip is connected with the base electrode of the triode, the emitter of the triode is grounded, the collector electrode of the triode is connected with a power supply VCC through the coil of the relay, and the normally open contact of the relay is arranged between a telephone line and a DTMF decoding circuit and between the telephone line and the voice reminding module.

4. A home remote control system as claimed in claim 1 or 2, wherein: the ringing detection circuit comprises a bridge rectifier module, an optical coupling circuit and an AND gate circuit, wherein a telephone line is connected with the input end of the bridge rectifier circuit, the voltage rectified and output by the bridge rectifier circuit is connected with the input end of the optical coupling circuit after passing through a filtering and voltage stabilizing circuit, the output end of the optical coupling circuit is connected with one input end of the AND gate circuit, the other input end of the AND gate circuit is grounded, and the output end of the AND gate circuit is connected with the single chip microcomputer.

5. A home remote control system as claimed in claim 1 or 2, wherein: the voice reminding circuit comprises an ISD2560 chip and is used for outputting a preset voice reminding signal according to an input control signal of the single chip microcomputer.

6. A control method of a home remote control system as claimed in any one of claims 1 to 5, wherein: the method comprises the following steps:

step 1: the singlechip detects ringing signals through the ringing detection circuit and counts ringing times, and when the ringing times are more than the set times, the singlechip switches on the connection between a telephone line and the voice reminding module through the on-off and on-hook circuit;

step 2: the voice reminding module sends a voice signal for reminding the other party of inputting the verification password to the telephone line and is received by the dialed telephone;

and step 3: the singlechip receives transmitted data from the telephone line through the DTMF decoding circuit, decodes the data and transmits the decoded data to the singlechip, and after the password is correct, the singlechip drives the voice reminding module to input the request to a numerical key corresponding to the controlled household appliance through the telephone line;

and 4, step 4: the single chip microcomputer obtains signals on a telephone line through a DTMF decoding circuit to obtain numbers and determines household appliances corresponding to the numbers;

and 5: the singlechip controls the on-off control of the household appliance;

step 6: the single chip microcomputer controls the pick-and-place machine circuit to carry out on-place operation.

7. The control method of a home remote control system as claimed in claim, wherein: when the single chip microcomputer obtains a key signal transmitted from a telephone line through the DTMF decoding circuit, the single chip microcomputer controls the on-hook circuit to control on-hook when the key signal is not received within a set time interval.

8. A control method of a home remote control system as claimed in claim 6 or 7, wherein: in step 3: the DTMF decoding chip MT8870 converts the key signals input by the user into corresponding digital signals and sends the digital signals to the singlechip for judgment; if the password is incorrect, the singlechip drives the voice prompt module to transmit the voice prompt for re-input, and when the input times exceed the set times, the system automatically hangs up.

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