CN111123881B - High-precision household appliance control system - Google Patents
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- CN111123881B CN111123881B CN202010121804.2A CN202010121804A CN111123881B CN 111123881 B CN111123881 B CN 111123881B CN 202010121804 A CN202010121804 A CN 202010121804A CN 111123881 B CN111123881 B CN 111123881B
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Classifications
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/418—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS], computer integrated manufacturing [CIM]
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B15/00—Systems controlled by a computer
- G05B15/02—Systems controlled by a computer electric
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D27/00—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00
- G05D27/02—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00 characterised by the use of electric means
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/26—Pc applications
- G05B2219/2642—Domotique, domestic, home control, automation, smart house
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
Abstract
The invention provides a high-precision household appliance control system which comprises a display unit, a storage unit, a control unit, a dust detection unit, a signal processing unit, an embedded controller, a power supply unit, a temperature sensor, a humidity sensor, a WiFi unit and a remote monitoring end, wherein the dust detection unit comprises a light source and a light intensity sensor, the light source is arranged on the ground in a household, the light source emits light signals, the light intensity sensor is arranged on a ceiling in the household and is used for receiving the light intensity emitted by the light source, the light intensity sensor converts the received light intensity into an electric signal, the electric signal is transmitted to the signal processing unit, the detection precision of the light intensity sensor can be greatly improved by the signal processing unit, and the indoor household appliance is controlled with high precision by the control unit.
Description
Technical Field
The invention relates to the field of intelligent household appliances, in particular to a high-precision household appliance control system.
Background
Smart home originates in the United states. The reconstruction of the "metropolitan office building" in the united states was completed in 1984, marking the formation of the first recognized "intelligent building" in the world. Originally, engineering sponsor UTBS is connected with communication equipment in a building to monitor and control equipment such as illumination, elevator and air conditioner of a building, and simultaneously provides information service functions such as voice call and e-mail. After that, countries such as Europe and Singapore put forward own intelligent home solutions.
At present, the development of intelligent home furnishing in developed countries abroad is relatively mature in comparison with China, the system standard suitable for own countries is gradually formed, a mature intelligent home furnishing ecological circle is gradually formed by virtue of the high-speed development of science and technology, all home furnishing products are respectively and independently operated, the cooperation of different workers is realized, the requirements of home owners are commonly treated, the intelligent home furnishing industry in japan is developed, the automatic networking of household appliances is widely realized at present, and an automatic door recognition system is realized by utilizing a biological authentication technology. In addition, the intelligent household equipment of the notebook is almost pore-free and can not enter. For example, some households have a smart sphygmomanometer mounted on a toilet pad, and the smart device can automatically detect the blood pressure and blood glucose level of the user and display the blood pressure and blood glucose level of all the households on a special display screen. Korean is more careful and more normative to the division of smart home system functions. Korean telecommunication 4A describes their digital home system (HDS) in which Any Device, any Time, any white, any Service, meaning that the system allows a user to operate Any Device at home and enjoy Any Service at Any place and Any Time. Some intelligent home systems set the refrigerator to be always in an on state and connect the refrigerator to a network, and meanwhile, the refrigerator is used as a control center of the intelligent system. The intelligent refrigerator not only can provide delicious recipes, but also can realize the functions of surfing the internet and watching television; the household health care checking system installed in the bedroom can monitor the symptoms of the user such as body temperature, pulse, respiration and the like at any time, so that doctors can monitor the health condition of the user in time. And the face-to-face consultation of the patient and the doctor is realized by networking the television of the bedroom.
In China, intelligent home is not a single product or system, is not an intelligent cell in the traditional sense, and is a multi-level home intelligent solution based on the cell. Compared with foreign countries, the development of the intelligent home industry in China is lagged, and the intelligent home network market in China is formed only after the intelligent home network industry in China successively goes through concept years, research and development years, experimental years, popularization years and popularization years.
With the development of economy and the progress of scientific technology, various household appliances in the household life of people are increasingly abundant. The household appliances are independent of each other, and the control modes are different, so that the household appliances are inconvenient for users to perform unified management and control. The single household appliance service is slow and can not meet the demands of users, and the unified management and remote control of various household appliances are future development trends. The traditional remote household appliance control system mostly uses a PC as a control terminal, and the networking mode mostly adopts a wired mode, so that the defects of high power consumption, inconvenience in wiring and movement of the control terminal and the like exist.
Disclosure of Invention
Therefore, in order to overcome the problems described above, the present invention provides a high-precision home appliance control system, which comprises a display unit, a storage unit, a control unit, a dust detection unit, a signal processing unit, an embedded controller, a power supply unit, a temperature sensor, a humidity sensor, a WiFi unit and a remote monitoring terminal, wherein the dust detection unit comprises a light source and a light intensity sensor, the light source is arranged on the ground in the home, the light source emits light signals, the light intensity sensor is arranged on the ceiling in the home, the light intensity sensor is used for receiving the light intensity emitted by the light source, the light intensity sensor converts the received light intensity into an electrical signal, the light intensity sensor transmits the electrical signal to the signal processing unit, the signal processing unit can greatly improve the detection precision of the light intensity sensor, and the control unit is used for performing high-precision control on the home appliance in the home.
The high-precision household appliance control system provided by the invention comprises a display unit, a storage unit, a control unit, a dust detection unit, a signal processing unit, an embedded controller, a power supply unit, a temperature sensor, a humidity sensor, a WiFi unit and a remote monitoring end.
The dust detection unit is used for collecting household dust signals, the output end of the dust detection unit is connected with the input end of the signal processing unit, the output end of the signal processing unit is connected with the input end of the embedded controller, the temperature sensor is used for collecting household temperature signals, the output end of the temperature sensor is connected with the input end of the embedded controller, the humidity sensor is used for collecting household humidity signals, the output end of the humidity sensor is connected with the input end of the embedded controller, the embedded controller is connected with the remote monitoring end through the WiFi unit, the power supply unit provides power support for the embedded controller and the WiFi unit, and the input end of the display unit, the input end of the storage unit and the input end of the control unit are all connected with the output end of the embedded controller.
Preferably, the dust detection unit is used for collecting the dust signal in the house, the output end of the dust detection unit is connected with the input end of the signal processing unit, the signal processing unit carries out signal processing on the received dust signal and then transmits the processed dust signal to the embedded controller, the embedded controller stores a dust threshold value signal, the embedded controller compares the received dust signal with the dust threshold value signal, if the dust signal received by the embedded controller is larger than the dust threshold value signal, the embedded controller sends a first trigger signal to the control unit, and the control unit controls the air dust removal equipment in the house to carry out indoor dust removal operation after receiving the first trigger signal.
Preferably, the temperature sensor is used for collecting a temperature signal in a house, the temperature sensor transmits the collected temperature signal to the embedded controller, a temperature threshold value signal is stored in the embedded controller, if the temperature signal received by the embedded controller is larger than the temperature threshold value signal, the embedded controller sends a second trigger signal to the control unit, the control unit controls the air conditioning equipment in the house to perform cooling operation after receiving the second trigger signal until the temperature signal collected by the temperature sensor is equal to the temperature threshold value signal, if the temperature signal received by the embedded controller is smaller than the temperature threshold value signal, the embedded controller sends a third trigger signal to the control unit, and the control unit controls the air conditioning equipment in the house to perform heating operation after receiving the third trigger signal until the temperature signal collected by the temperature sensor is equal to the temperature threshold value signal.
Preferably, the humidity sensor is used for collecting humidity signals in a house, the humidity sensor transmits the collected humidity signals to the embedded controller, humidity threshold signals are stored in the embedded controller, if the humidity signals received by the embedded controller are larger than the humidity threshold signals, the embedded controller sends fourth trigger signals to the control unit, the control unit controls the indoor dehumidification equipment to perform dehumidification operation after receiving the fourth trigger signals until the humidity signals collected by the humidity sensor are equal to the humidity threshold signals, if the humidity signals received by the embedded controller are smaller than the humidity threshold signals, the embedded controller sends fifth trigger signals to the control unit, and the control unit controls the indoor humidification equipment to perform humidification operation after receiving the fifth trigger signals until the humidity signals collected by the humidity sensor are equal to the humidity threshold signals.
Preferably, the embedded controller transmits the received temperature signal, humidity signal and dust signal to the display unit for display, the embedded controller transmits the received temperature signal, humidity signal and dust signal to the storage unit for storage, and the embedded controller transmits the received temperature signal, humidity signal and dust signal to the remote monitoring end through the WiFi unit.
Preferably, the power supply unit comprises a 220VAC mains supply, a rectifying unit and a voltage conversion unit, wherein the 220VAC mains supply transmits the 220VAC to the rectifying unit, the rectifying unit converts the received 220VAC into 5DC and provides power support for the embedded controller, the rectifying unit transmits the converted 5DC to the voltage conversion unit, and the voltage conversion unit converts the received 5DC into 3.3DC and provides power support for the WiFi unit.
Preferably, the dust detection unit comprises a light source and a light intensity sensor, wherein the light source is arranged on the ground in a house, the light source emits light signals, the light intensity sensor is arranged on a ceiling in the house and is used for receiving the light intensity emitted by the light source, the light intensity sensor converts the received light intensity into an electric signal, and the light intensity sensor transmits the electric signal to the signal processing unit.
Preferably, the light intensity sensor is used for receiving the light intensity emitted by the light source, the light intensity sensor converts the received light intensity into a voltage signal V0, the voltage signal V0 is transmitted to the signal processing unit, V1 is the voltage signal processed by the signal processing unit, the signal processing unit comprises a signal amplifying unit and a signal filtering unit, the output end of the light intensity sensor is connected with the input end of the signal amplifying unit, the output end of the signal amplifying unit is connected with the input end of the signal filtering unit, and the output end of the signal filtering unit is connected with the input end of the embedded controller.
Preferably, the signal amplifying unit comprises resistors R1-R9, capacitors C1-C2 and operational amplifiers A1-A3, wherein the resistor R9 is a sliding rheostat.
The output end of the light intensity sensor is connected with one end of a resistor R1, the other end of the resistor R1 is connected with the non-inverting input end of an operational amplifier A1, one end of a resistor R2 is connected with one end of a capacitor C1, the other end of the resistor R2 is connected with the other end of the capacitor C1, the other end of the resistor R2 is connected with the output end of the operational amplifier A1, one end of a resistor R5 is connected with the output end of the operational amplifier A1, one end of a resistor R3 is grounded, the other end of the resistor R3 is connected with the non-inverting input end of the operational amplifier A2, one end of the resistor R4 is connected with the output end of the operational amplifier A2, the other end of the resistor R4 is connected with the inverting input end of the operational amplifier A2, one end of the capacitor C2 is connected with one end of the resistor C4, the other end of the resistor C6 is connected with one end of the resistor C4, the other end of the resistor R6 is connected with the non-inverting input end of the resistor A3, the other end of the resistor R8 is connected with the other end of the resistor R3, the other end of the resistor R8 is connected with the other end of the resistor C9, and the other end of the resistor R3 is connected with the other end of the resistor A3 is connected with the inverting input end of the resistor A3, and the other end of the resistor is connected with the other end of the resistor 3 is connected with the other end of the resistor 3.
Preferably, the signal filtering unit comprises resistors R10-R12, capacitors C3-C5 and an operational amplifier A4.
The output end of the signal amplifying unit is connected with one end of a resistor R10, one end of a capacitor C3 and one end of a capacitor C4 which are connected in parallel are connected with the output end of an operational amplifier A4, the other end of the capacitor C3 and the other end of the capacitor C4 which are connected in parallel are connected with the other end of a resistor R10, one end of the capacitor C5 is grounded, the other end of the capacitor C5 is connected with the in-phase input end of the operational amplifier A4, one end of a resistor R11 is connected with one end of the capacitor C3 and one end of the capacitor C4 which are connected in parallel, the inverting input end of the operational amplifier A4 is connected with the output end of the operational amplifier A4, one end of a resistor R12 is connected with the input end of an embedded controller, and the signal filtering unit transmits a voltage signal V1 to the embedded controller.
Preferably, the embedded controller is STM32F107.
Compared with the prior art, the invention has the following beneficial effects:
(1) The invention provides a high-precision household appliance control system which comprises a display unit, a storage unit, a control unit, a dust detection unit, a signal processing unit, an embedded controller, a power supply unit, a temperature sensor, a humidity sensor, a WiFi unit and a remote monitoring end, wherein the dust detection unit comprises a light source and a light intensity sensor, the light source is arranged on the ground in a house, the light source emits light signals, the light intensity sensor is arranged on a ceiling in the house and is used for receiving the light intensity emitted by the light source, the light intensity sensor converts the received light intensity into an electric signal, the light intensity sensor transmits the electric signal to the signal processing unit, the signal processing unit can greatly improve the detection precision of the light intensity sensor, and the control unit is used for carrying out high-precision control on the household appliance in the house.
(2) The dust detection unit comprises a light source and a light intensity sensor, wherein the light source is arranged on the ground in a house, the light source emits light signals, the light intensity sensor is arranged on a ceiling in the house, the light intensity sensor is used for receiving the light intensity emitted by the light source, the light intensity sensor converts the received light intensity into an electric signal, and the light intensity sensor transmits the electric signal to the signal processing unit.
(3) The invention is also characterized in that the noise of the signal processing unit provided by the invention is within 1.25nV, the drift is 0.75 mu V/DEG C, and the detection precision of the light intensity sensor is greatly improved.
Drawings
FIG. 1 is a schematic diagram of a high-precision home appliance control system of the present invention;
FIG. 2 is a schematic diagram of a dust detection unit according to the present invention;
fig. 3 is a circuit diagram of a signal processing unit of the present invention.
Detailed Description
The high-precision home appliance control system of the present invention will be described in detail with reference to the accompanying drawings and examples.
As shown in FIG. 1, the high-precision household appliance control system provided by the invention comprises a display unit, a storage unit, a control unit, a dust detection unit, a signal processing unit, an embedded controller, a power supply unit, a temperature sensor, a humidity sensor, a WiFi unit and a remote monitoring end.
The dust detection unit is used for collecting household dust signals, the output end of the dust detection unit is connected with the input end of the signal processing unit, the output end of the signal processing unit is connected with the input end of the embedded controller, the temperature sensor is used for collecting household temperature signals, the output end of the temperature sensor is connected with the input end of the embedded controller, the humidity sensor is used for collecting household humidity signals, the output end of the humidity sensor is connected with the input end of the embedded controller, the embedded controller is connected with the remote monitoring end through the WiFi unit, the power supply unit provides power support for the embedded controller and the WiFi unit, and the input end of the display unit, the input end of the storage unit and the input end of the control unit are all connected with the output end of the embedded controller.
In the above embodiment, the dust detection unit is used for collecting the dust signal in the house, the output end of the dust detection unit is connected with the input end of the signal processing unit, the signal processing unit performs signal processing on the received dust signal and then transmits the processed dust signal to the embedded controller, the embedded controller stores a dust threshold signal, the embedded controller compares the received dust signal with the dust threshold signal, if the dust signal received by the embedded controller is greater than the dust threshold signal, the embedded controller sends a first trigger signal to the control unit, and the control unit controls the air dust removal equipment in the house to perform indoor dust removal operation after receiving the first trigger signal.
The temperature sensor is used for collecting temperature signals in a house, the temperature sensor transmits the collected temperature signals to the embedded controller, the embedded controller stores temperature threshold signals, if the temperature signals received by the embedded controller are larger than the temperature threshold signals, the embedded controller sends second trigger signals to the control unit, the control unit receives the second trigger signals and then controls the air conditioning equipment in the house to conduct cooling operation until the temperature signals collected by the temperature sensor are equal to the temperature threshold signals, if the temperature signals received by the embedded controller are smaller than the temperature threshold signals, the embedded controller sends third trigger signals to the control unit, and the control unit controls the air conditioning equipment in the house to conduct heating operation after receiving the third trigger signals until the temperature signals collected by the temperature sensor are equal to the temperature threshold signals.
The humidity sensor is used for collecting indoor humidity signals, the humidity sensor transmits the collected humidity signals to the embedded controller, humidity threshold signals are stored in the embedded controller, if the humidity signals received by the embedded controller are larger than the humidity threshold signals, the embedded controller sends fourth trigger signals to the control unit, the control unit controls indoor dehumidification equipment to dehumidify after receiving the fourth trigger signals until the humidity signals collected by the humidity sensor are equal to the humidity threshold signals, if the humidity signals received by the embedded controller are smaller than the humidity threshold signals, the embedded controller sends fifth trigger signals to the control unit, and the control unit controls indoor humidification equipment to carry out humidification operation after receiving the fifth trigger signals until the humidity signals collected by the humidity sensor are equal to the humidity threshold signals.
The embedded controller transmits the received temperature signal, humidity signal and dust signal to the display unit for display, and transmits the received temperature signal, humidity signal and dust signal to the storage unit for storage, and the embedded controller transmits the received temperature signal, humidity signal and dust signal to the remote monitoring end through the WiFi unit.
Still further, the high-precision household appliance control system provided by the invention comprises a display unit, a storage unit, a control unit, a dust detection unit, a signal processing unit, an embedded controller, a power supply unit, a temperature sensor, a humidity sensor, a WiFi unit and a remote monitoring end, wherein the dust detection unit comprises a light source and a light intensity sensor, the light source is arranged on the ground in a household, the light source emits light signals, the light intensity sensor is arranged on a ceiling in the household and is used for receiving the light intensity emitted by the light source, the light intensity sensor converts the received light intensity into an electric signal, the light intensity sensor transmits the electric signal to the signal processing unit, the signal processing unit can greatly improve the detection precision of the light intensity sensor, and the control unit is used for carrying out high-precision control on the household appliance in the household.
Furthermore, the output signals of the light intensity sensor, the temperature sensor and the humidity sensor are all voltage signals, and meanwhile, the dust signal threshold value, the temperature signal threshold value and the humidity signal threshold value are all voltage signals, so that the output signals of the light intensity sensor, the temperature sensor and the humidity sensor do not need to be converted into dust concentration values, temperature values and humidity values, and the running speed of the high-precision household appliance control system is improved.
As shown in fig. 1, the power supply unit is characterized in that the power supply unit comprises a commercial power 220VAC, a rectifying unit and a voltage conversion unit, the commercial power 220VAC transmits the 220VAC to the rectifying unit, the rectifying unit converts the received 220VAC into 5DC and provides power support for the embedded controller, the rectifying unit transmits the converted 5DC to the voltage conversion unit, and the voltage conversion unit converts the received 5DC into 3.3DC and provides power support for the WiFi unit.
As shown in fig. 2, the dust detection unit includes a light source and a light intensity sensor, the light source is disposed on the floor of the house, the light source emits a light signal, the light intensity sensor is disposed on the ceiling of the house, the light intensity sensor is configured to receive the light intensity emitted by the light source, the light intensity sensor converts the received light intensity into an electrical signal, and the light intensity sensor transmits the electrical signal to the signal processing unit.
At present, dust detectors which are put into use are mainly divided into a microcomputer laser type detector and an alternating current electrostatic induction type detector. Dust meters based on tribostatic technology use a probe inserted into the flue gas duct, so that the change in the charge carried by the particles can be measured and the relevant data recorded. They can only measure dust that has collided or is very close to the probe. Dust meters based on the spectrophotometry technique mainly use light transmission means to measure particle density and narrow light beams passing through the flue gas duct to measure the value of light absorption. The dust measuring instrument based on the light scattering technology measures the content of particles by using the flashing frequency of particle reflection and the duration of the process, and has the biggest advantage that errors caused by factors such as humidity and the like can be greatly reduced. Dust measuring instruments based on light absorption technology utilize the principle that light waves interact with a linear substance when passing through the substance, one part of the light waves are absorbed by the medium, the other part of the light waves are scattered by the medium, and the rest part of the light waves keep the original propagation direction and pass through the medium. The measuring instrument calculates the dust concentration by measuring the energy intensity of the incident light and the energy intensity of the emergent light, and has the biggest advantage of throwing away to ensure accurate measurement results when the dust concentration is large.
The dust detection unit provided by the invention comprises a light source and a light intensity sensor, wherein the light source is arranged on the ground in a house, the light source emits light signals, the light intensity sensor is arranged on a ceiling in the house and is used for receiving the light intensity emitted by the light source, and the light intensity sensor converts the received light intensity into an electric signal.
As shown in fig. 3, the light intensity sensor is configured to receive light intensity emitted by the light source, the light intensity sensor converts the received light intensity into a voltage signal V0, and transmits the voltage signal V0 to the signal processing unit, V1 is the voltage signal processed by the signal processing unit, the signal processing unit includes a signal amplifying unit and a signal filtering unit, an output end of the light intensity sensor is connected with an input end of the signal amplifying unit, an output end of the signal amplifying unit is connected with an input end of the signal filtering unit, and an output end of the signal filtering unit is connected with an input end of the embedded controller.
Specifically, the signal amplifying unit comprises resistors R1-R9, capacitors C1-C2 and operational amplifiers A1-A3, wherein the resistor R9 is a slide rheostat.
The output end of the light intensity sensor is connected with one end of a resistor R1, the other end of the resistor R1 is connected with the non-inverting input end of an operational amplifier A1, one end of a resistor R2 is connected with one end of a capacitor C1, the other end of the resistor R2 is connected with the other end of the capacitor C1, the other end of the resistor R2 is connected with the output end of the operational amplifier A1, one end of a resistor R5 is connected with the output end of the operational amplifier A1, one end of a resistor R3 is grounded, the other end of the resistor R3 is connected with the non-inverting input end of the operational amplifier A2, one end of the resistor R4 is connected with the output end of the operational amplifier A2, the other end of the resistor R4 is connected with the inverting input end of the operational amplifier A2, one end of the capacitor C2 is connected with one end of the resistor C4, the other end of the resistor C6 is connected with one end of the resistor C4, the other end of the resistor R6 is connected with the non-inverting input end of the resistor A3, the other end of the resistor R8 is connected with the other end of the resistor R3, the other end of the resistor R8 is connected with the other end of the resistor C9, and the other end of the resistor R3 is connected with the other end of the resistor A3 is connected with the inverting input end of the resistor A3, and the other end of the resistor is connected with the other end of the resistor 3 is connected with the other end of the resistor 3.
Specifically, the signal filtering unit comprises resistors R10-R12, capacitors C3-C5 and an operational amplifier A4.
The output end of the signal amplifying unit is connected with one end of a resistor R10, one end of a capacitor C3 and one end of a capacitor C4 which are connected in parallel are connected with the output end of an operational amplifier A4, the other end of the capacitor C3 and the other end of the capacitor C4 which are connected in parallel are connected with the other end of a resistor R10, one end of the capacitor C5 is grounded, the other end of the capacitor C5 is connected with the in-phase input end of the operational amplifier A4, one end of a resistor R11 is connected with one end of the capacitor C3 and one end of the capacitor C4 which are connected in parallel, the inverting input end of the operational amplifier A4 is connected with the output end of the operational amplifier A4, one end of a resistor R12 is connected with the input end of an embedded controller, and the signal filtering unit transmits a voltage signal V1 to the embedded controller.
In the above embodiment, in the signal amplifying unit, the resistance of the resistor R1 is 150k ohms, the resistance of the resistor R2 is 150k ohms, the resistance of the resistor R3 is 150k ohms, the resistance of the resistor R4 is 150k ohms, the resistance of the resistor R5 is 20k ohms, the resistance of the resistor R6 is 20k ohms, the resistance of the resistor R7 is 300k ohms, the resistance of the resistor R8 is 300k ohms, the full Cheng Zu value of the resistor R9 is 104 ohms, the capacitance of the capacitor C1 is 5p method, the capacitance of the capacitor C2 is 5p method, and the types of the operational amplifiers A1 to A3 are OP37G.
Furthermore, since the signal detected by the sensor is weak and has a high frequency (about 200 kHz), the signal amplifying unit provided by the invention requires high input impedance, high common mode rejection ratio, good symmetry, and a sufficiently wide frequency band, and adopts three operational amplifiers to form an amplifying circuit.
As can be seen from the circuit diagram, the signal amplifying unit provided by the invention maintains perfect symmetry from the input stage to the output stage, and the gain is as follows:
。
the gain of the signal amplifying unit can be changed by adjusting the sliding rheostat R9 without affecting the symmetry of the signal amplifying unit circuit, and the common mode rejection ratio CMRR of the current is determined by the CMRR of the operational amplifier A2 and the accuracy of r7/r5=r8/R6, so that the resistors R5-R7 are all precise resistors in specific application, so as to ensure that the amplifying circuit has higher CMRR.
Since the signal frequency of the sensor is about 200kHz, the frequency is higher for the operational amplifier in the prior art, and the amplification effect on weak signals is ensured, so the bandwidth gain product of the signal amplifying unit is not less than 10MHz, the high-frequency operational amplifier OP37G is selected for the signal amplifying unit, and the bandwidth gain product is 63MHz. The invention is also characterized in that the lead compensation is adopted, a capacitor of 5pF is respectively connected in parallel with the resistor R2 and the resistor R4, thus the zero point is added at the loop gain curve fz, wherein,
。
in the signal filtering unit, the resistance of the resistor R10 is 36k ohms, the resistance of the resistor R11 is 36k ohms, the resistance of the resistor R12 is 1k ohms, the capacitance of the capacitor C3 is 0.1 mu method, the capacitance of the capacitor C4 is 0.1 mu method, the capacitance of the capacitor C5 is 0.1 mu method, and the signal of the operational amplifier A4 is OPA277.
The signal filtering unit is a low-pass filter, can filter noise signals with the frequency of about 50Hz, and has the transfer function of:
。
the cut-off frequency fc of the signal filtering unit is:
。
the quality factor Q of the signal filtering unit is:
。
the noise of the signal processing circuit provided by the invention is within 1.25nV, and the drift is 0.75 mu V/DEG C.
Specifically, the embedded controller is STM32F107.
The high-precision household appliance control system provided by the invention is communicated with the master control chip STM32F107 through an SPI bus.
SPI (synchronous serial interface technology) allows microcontrollers such as MCU or ARM to interact data with various peripheral devices in a full duplex synchronous serial manner. In actual design, only 5 pins (4 pins are connected with the SPI controller and the other is used as an interrupt input line) are allocated on the main control chip STM32F107, so that the control and data transmission of synchronous serial communication between the chip and the main control chip STM32F107 can be realized, the occupation of the pins of the chip is saved, and the space is saved for the PCB layout.
When the system runs specifically, the main program firstly performs system initialization processing, including pin port initialization, SPI initialization, timer setting and the like of the STM32F107 chip. If the EnterMode variable flag has entered the wait configuration state, when the EnterMode variable is 1, the smartconfig configuration process may begin, and if it is 0, wait continues. The CC3000Connected variable is used to determine whether the smartconfig network configuration process is finished, if the variable is 1, it indicates that the smartconfig process is finished, the CC3000 device is Connected to the wireless network, and the data transmission process is entered after the configuration process is finished. Meanwhile, after the configuration process is finished, the variable CC3000Connected is set to 0 and stored in the EEPROM, so that the configuration process is realized only once. If reconfiguration is required, the variable CC3000Connected is set to 1 in the configuration wait state.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It is to be understood that the invention is not limited to the precise arrangements and instrumentalities shown in the drawings, which have been described above, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (5)
1. The high-precision household appliance control system is characterized by comprising a display unit, a storage unit, a control unit, a dust detection unit, a signal processing unit, an embedded controller, a power supply unit, a temperature sensor, a humidity sensor, a WiFi unit and a remote monitoring end; the dust detection unit is used for collecting household dust signals, the dust detection unit is connected with the signal processing unit, the signal processing unit is connected with the embedded controller, the temperature sensor is used for collecting household temperature signals, the temperature sensor is connected with the embedded controller, the humidity sensor is used for collecting household humidity signals, the humidity sensor is connected with the embedded controller, the embedded controller is connected with the remote monitoring end through the WiFi unit, and the input end of the display unit, the input end of the storage unit and the control unit are all connected with the embedded controller; the dust detection unit comprises a light source and a light intensity sensor, wherein the light source is arranged on the ground in a house, the light source emits light signals, the light intensity sensor is arranged on a ceiling in the house and is used for receiving the light intensity emitted by the light source, the light intensity sensor converts the received light intensity into an electric signal, and the light intensity sensor transmits the electric signal to the signal processing unit; the light intensity sensor is used for receiving the light intensity emitted by the light source, the light intensity sensor converts the received light intensity into a voltage signal V0, the voltage signal V0 is transmitted to the signal processing unit, V1 is the voltage signal processed by the signal processing unit, the signal processing unit comprises a signal amplifying unit and a signal filtering unit, the output end of the light intensity sensor is connected with the input end of the signal amplifying unit, the output end of the signal amplifying unit is connected with the input end of the signal filtering unit, and the output end of the signal filtering unit is connected with the input end of the embedded controller; the signal amplifying unit comprises resistors R1-R9, capacitors C1-C2 and operational amplifiers A1-A3, and the resistor R9 is a slide rheostat; the output end of the light intensity sensor is connected with one end of a resistor R1, the other end of the resistor R1 is connected with the in-phase input end of an operational amplifier A1, one end of a resistor R2 is connected with the inverting input end of the operational amplifier A1, one end of a resistor R2 is connected with one end of a capacitor C1, the other end of the resistor R2 is connected with the other end of the capacitor C1, the other end of the resistor R2 is connected with the output end of the operational amplifier A1, one end of a resistor R3 is grounded, the other end of the resistor R3 is connected with the in-phase input end of the operational amplifier A2, one end of a resistor R4 is connected with the output end of the operational amplifier A2, the other end of the resistor R4 is connected with the inverting input end of the operational amplifier A2, one end of the capacitor C2 is connected with one end of the other end of the resistor C4, one end of the resistor C6 is connected with one end of the resistor C4, the other end of the resistor R6 is connected with the other end of the resistor C3, the other end of the resistor R8 is connected with the inverting input end of the resistor A3, and the other end of the resistor A3 is connected with the inverting input end of the resistor A9; the signal filtering unit comprises resistors R10-R12, capacitors C3-C5 and an operational amplifier A4; the output end of the signal amplifying unit is connected with one end of a resistor R10, one end of a capacitor C3 connected in parallel with a capacitor C4 is connected with the output end of an operational amplifier A4, the other end of the capacitor C3 connected in parallel with the capacitor C4 is connected with the other end of a resistor R10, one end of a capacitor C5 is grounded, the other end of the capacitor C5 is connected with the in-phase input end of the operational amplifier A4, one end of a resistor R11 is connected with one end of the capacitor C3 connected in parallel with the capacitor C4, the other end of the resistor R11 is connected with the other end of the capacitor C5, the inverting input end of the operational amplifier A4 is connected with the output end of the operational amplifier A4, one end of a resistor R12 is connected with the input end of the embedded controller, and the signal filtering unit transmits a voltage signal V1 to the embedded controller; in the signal amplifying unit, the resistance value of a resistor R1 is 150k ohms, the resistance value of a resistor R2 is 150k ohms, the resistance value of a resistor R3 is 150k ohms, the resistance value of a resistor R4 is 150k ohms, the resistance value of a resistor R5 is 20k ohms, the resistance value of a resistor R6 is 20k ohms, the resistance value of a resistor R7 is 300k ohms, the resistance value of a resistor R8 is 300k ohms, the full Cheng Zu value of a resistor R9 is 104 ohms, the capacitance value of a capacitor C1 is 5p method, the capacitance value of a capacitor C2 is 5p method, and the types of operational amplifiers A1-A3 are OP37G; the signal amplifying unit keeps symmetrical from the input stage to the output stage circuit, and the gain is as follows:
；
the bandwidth gain product of the signal amplifying unit is not less than 10MHz, the signal amplifying unit selects a high-frequency operational amplifier OP37G, and the bandwidth gain product is 63MHz;
a capacitor of 5pF is connected in parallel to each of the resistors R2 and R4, corresponding to the addition of a zero point at the loop gain curve fz, wherein,
；
in the signal filtering unit, the resistance value of the resistor R10 is 36k ohms, the resistance value of the resistor R11 is 36k ohms, the resistance value of the resistor R12 is 1k ohms, the capacitance value of the capacitor C3 is 0.1 mu method, the capacitance value of the capacitor C4 is 0.1 mu method, the capacitance value of the capacitor C5 is 0.1 mu method, and the signal of the operational amplifier A4 is OPA277;
the signal filtering unit is a low-pass filter for filtering noise signals with the frequency of 50Hz, and the transfer function of the signal filtering unit is as follows:
；
the cut-off frequency fc of the signal filtering unit is:
；
the quality factor Q of the signal filtering unit is:
；
noise of the signal processing circuit is within 1.25nV, and drift is 0.75 mu V/DEG C.
2. The high-precision household appliance control system according to claim 1, wherein the signal processing unit processes the received dust signal and transmits the processed dust signal to the embedded controller, a dust threshold signal is stored in the embedded controller, the embedded controller compares the received dust signal with the dust threshold signal, if the dust signal received by the embedded controller is greater than the dust threshold signal, the embedded controller sends a first trigger signal to the control unit, and the control unit controls the indoor air dust removal equipment to perform indoor dust removal operation after receiving the first trigger signal.
3. The high-precision household appliance control system according to claim 1, wherein the temperature sensor transmits the collected temperature signal to the embedded controller, a temperature threshold signal is stored in the embedded controller, if the temperature signal received by the embedded controller is greater than the temperature threshold signal, the embedded controller sends a second trigger signal to the control unit, the control unit receives the second trigger signal and then controls the household air conditioning equipment to perform cooling operation until the temperature signal collected by the temperature sensor is equal to the temperature threshold signal, if the temperature signal received by the embedded controller is less than the temperature threshold signal, the embedded controller sends a third trigger signal to the control unit, and after receiving the third trigger signal, the control unit controls the household air conditioning equipment to perform heating operation until the temperature signal collected by the temperature sensor is equal to the temperature threshold signal.
4. The high-precision household appliance control system according to claim 1, wherein the humidity sensor is used for collecting a humidity signal in a household, the humidity sensor transmits the collected humidity signal to the embedded controller, a humidity threshold signal is stored in the embedded controller, if the humidity signal received by the embedded controller is greater than the humidity threshold signal, the embedded controller sends a fourth trigger signal to the control unit, the control unit receives the fourth trigger signal and then controls a dehumidification device in the household to perform dehumidification operation until the humidity signal collected by the humidity sensor is equal to the humidity threshold signal, if the humidity signal received by the embedded controller is less than the humidity threshold signal, the embedded controller sends a fifth trigger signal to the control unit, and the control unit controls the humidification device in the household to perform humidification operation after receiving the fifth trigger signal until the humidity signal collected by the humidity sensor is equal to the humidity threshold signal; the embedded controller transmits the received temperature signal, humidity signal and dust signal to the display unit for display, the embedded controller transmits the received temperature signal, humidity signal and dust signal to the storage unit for storage, and the embedded controller transmits the received temperature signal, humidity signal and dust signal to the remote monitoring end through the WiFi unit.
5. The high precision home appliance control system of claim 1, wherein the power supply unit comprises a mains 220VAC, a rectifying unit and a voltage conversion unit, the mains 220VAC transmits 220VAC to the rectifying unit, the rectifying unit converts the received 220VAC into 5DC and provides power support for the embedded controller, the rectifying unit transmits the converted 5DC to the voltage conversion unit, and the voltage conversion unit converts the received 5DC into 3.3DC and provides power support for the WiFi unit.
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| CN207675600U (en) * | 2017-12-07 | 2018-07-31 | 华北科技学院 | A kind of intelligence high-precision dust sensor |
| CN109781190A (en) * | 2019-03-26 | 2019-05-21 | 南京梵科智能科技有限公司 | A kind of construction site environment comprehensive monitoring system |
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