CN116168568A - Intelligent furniture teaching module - Google Patents

Intelligent furniture teaching module Download PDF

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Publication number
CN116168568A
CN116168568A CN202211339047.1A CN202211339047A CN116168568A CN 116168568 A CN116168568 A CN 116168568A CN 202211339047 A CN202211339047 A CN 202211339047A CN 116168568 A CN116168568 A CN 116168568A
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CN
China
Prior art keywords
module
central control
control module
sensor
teaching
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Pending
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CN202211339047.1A
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Chinese (zh)
Inventor
刘明君
刘明杰
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Shenzhen Aichuang Technology Education Co ltd
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Shenzhen Aichuang Technology Education Co ltd
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Priority to CN202211339047.1A priority Critical patent/CN116168568A/en
Publication of CN116168568A publication Critical patent/CN116168568A/en
Pending legal-status Critical Current

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    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09BEDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
    • G09B5/00Electrically-operated educational appliances
    • G09B5/02Electrically-operated educational appliances with visual presentation of the material to be studied, e.g. using film strip
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09BEDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
    • G09B19/00Teaching not covered by other main groups of this subclass
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P90/00Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
    • Y02P90/02Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]

Abstract

The invention belongs to the technical field of teaching appliances, and relates to an intelligent furniture teaching module, which comprises: the system comprises an environment monitoring module, a central control module and an execution module; the environment monitoring module is connected with the central control module and comprises one or two or more sensors, and different sensors are identified through code distinction; the central control module is used for identifying the sensor through encoding and receiving the data of the sensor in real time; the execution module is connected with the central control module and drives the execution module to execute actions through the central control module; the central control module is provided with a driving unit and a setting unit, the driving unit comprises a plurality of driving circuits for driving the execution module, and the setting unit is used for setting a starting threshold value and an stopping threshold value of the driving circuits.

Description

Intelligent furniture teaching module
Technical Field
The invention belongs to the technical field of teaching appliances, and relates to an intelligent furniture teaching module.
Background
The intelligent furniture is based on modern fashion furniture, and the combination intelligence, the electronic intelligence, the mechanical intelligence and the internet of things intelligence are smartly integrated into furniture products, so that the furniture is intelligent, internationalized and fashionable, the home life is more convenient and comfortable, the intelligent furniture is an important component of a new and expensive life style, and the intelligent furniture is a development trend and trend of future international home life.
Along with the development of science and technology, intelligent life is popularized. Appliances such as intelligent furniture and intelligent automobiles are integrated into our lives. In the intelligent age, in order to enable students in middle and primary schools to be integrated into a system of intelligent home earlier, the students in middle and primary schools can learn and master related knowledge, and various schools want to develop related teaching courses so as to excite students to understand and think of intelligent furniture, and design and manual ability of the students can be cultivated.
But the relevant course is done with the following difficulties:
1. the existing intelligent furniture is complicated in hardware, exceeds the understanding range of students, has high difficulty in getting hands, and is not beneficial to training the design thinking of the students;
2. the driving circuit programming difficulty is great, and the cover face is wider, has formed great examination to the teaching and learning strength, hinders the implementation of course.
Therefore, the design of the intelligent teaching aid which is fit with the idea of intelligent furniture and is easy to popularize and go up the hand becomes a difficult problem to be solved urgently.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an intelligent furniture teaching module, which is internally provided with execution circuits of various electronic elements, is plug and play, reduces the course difficulty of teachers and students and cultures the control thinking of intelligent home.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
an intelligent furniture teaching module, comprising: the system comprises an environment monitoring module, a central control module and an execution module;
the environment monitoring module is connected with the central control module and comprises one or two or more sensors, and different sensors are identified through code distinction;
the central control module is used for identifying the sensor through encoding and receiving the data of the sensor in real time;
the execution module is connected with the central control module and drives the execution module to execute actions through the central control module;
the central control module is provided with a driving unit and a setting unit, the driving unit comprises a plurality of driving circuits for driving the execution module, and the setting unit is used for setting a starting threshold value and an stopping threshold value of the driving circuits.
Further, the central control module comprises a power supply unit, and the power supply unit is used for providing electric energy for the central control module, the environment monitoring module and the execution module.
Further, the central control module comprises a display screen, wherein the display screen is used for displaying real-time data of the sensor, a starting threshold value and an stopping threshold value of the drive.
Further, the sensor is a temperature sensor and/or a humidity sensor and/or a soil humidity sensor and/or a human body sensor and/or a light intensity sensor and/or a distance sensor.
Further, the execution module comprises a direct current motor and/or an LED and/or an atomizing sheet and/or a buzzer and/or a stepping motor.
Further, the driving circuit comprises a direct current motor drive and/or an LED drive and/or an atomizing sheet drive and/or a buzzer drive and/or a stepping motor drive.
Further, the central control module comprises a plurality of dial switches, and the dial switches are used for respectively controlling power supply of different driving circuits.
Further, the environment monitoring module and the central control module are provided with wireless receiving and transmitting units, the environment monitoring module and the central control module are connected through the wireless receiving and transmitting units, and the environment monitoring module is provided with a power supply unit.
Further, the wireless transceiver unit is a Bluetooth connection module, a WiFi connection module or an Internet of things module.
Further, the number of the sensors is two or more environmental monitoring modules, and the setting unit comprises an 'and' button and an 'or' button.
By applying the technical scheme of the invention, different control effects can be realized by matching different sensors with different execution modules, and the principle demonstration of different intelligent furniture in daily life can be simulated, thereby meeting the teaching purpose of the intelligent furniture. The intelligent furniture is classified according to actual conditions by solving the problem that complicated driving programming work is needed by the central control module with a plurality of drives, and different drives are brought into the central control module in advance according to the execution module. When the teaching module is used, students only need to think about working logic of intelligent furniture, set working threshold values and stopping threshold values, and combine with expected working scenes to use the sensor and the linear module. The intelligent living course management system has the advantages that the intelligent living course management system is used as a teacher to place the center of the lesson preparation on the living scene and the intelligent home system, a professional technical level is not required to be drilled and researched, the burden of a classroom is reduced, and the intelligent living course can be conveniently developed and popularized.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
The present invention will be described in detail below with reference to the attached drawings, so that the above advantages of the present invention will be more apparent.
FIG. 1 is a workflow diagram of an intelligent furniture teaching module of the present invention;
FIG. 2 is a schematic diagram of the modular connection of the intelligent furniture teaching module of the present invention;
FIG. 3 is a schematic diagram of the circuit connections of an intelligent furniture teaching module of the present invention;
FIG. 4 is a circuit diagram of an MCU of the intelligent furniture teaching module of the present invention;
FIG. 5 is a circuit diagram of a setup unit of the intelligent furniture teaching module of the present invention;
FIG. 6 is a circuit diagram of a dial switch of an intelligent furniture teaching module according to the present invention;
FIG. 7 is a direct drive motor drive circuit diagram of an intelligent furniture teaching module of the present invention;
FIG. 8 is a schematic diagram of an LED driving circuit of the intelligent furniture teaching module of the present invention;
FIG. 9 is a diagram of an atomizing sheet driving circuit of the intelligent furniture teaching module of the present invention;
FIG. 10 is a buzzer driving circuit diagram of an intelligent furniture teaching module according to the present invention;
fig. 11 is a diagram of a stepping motor driving circuit of an intelligent furniture teaching module according to the present invention.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
In the description of the present invention, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships as described based on the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the embodiments of the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured" and the like are to be construed broadly and include, for example, either permanently connected, removably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
Referring to fig. 1-11, an intelligent furniture teaching module, comprising: the system comprises an environment monitoring module, a central control module and an execution module;
the environment monitoring module is connected with the central control module and comprises one or two or more sensors, and different sensors are identified through code distinction;
the central control module is used for identifying the sensor through encoding and receiving the data of the sensor in real time;
the execution module is connected with the central control module and drives the execution module to execute actions through the central control module;
the central control module is provided with a driving unit and a setting unit, the driving unit comprises a plurality of driving circuits for driving the execution module, and the setting unit is used for setting a starting threshold value and an stopping threshold value of the driving circuits.
Different control effects can be achieved through cooperation of different sensors and different execution modules, principle demonstration of different intelligent furniture in daily life can be simulated, and teaching purposes of the intelligent furniture are met. The intelligent furniture is classified according to actual conditions by solving the problem that complicated driving programming work is needed by the central control module with a plurality of drives, and different drives are brought into the central control module in advance according to the execution module. When the teaching module is used, students only need to think about working logic of intelligent furniture, set working threshold values and stopping threshold values, and combine with expected working scenes to use the sensor and the linear module. The intelligent living course management system has the advantages that the intelligent living course management system is used as a teacher to place the center of the lesson preparation on the living scene and the intelligent home system, a professional technical level is not required to be drilled and researched, the burden of a classroom is reduced, and the intelligent living course can be conveniently developed and popularized.
In this embodiment, the students select the required sensor and the linear module according to the envisaged living scene, connect the sensor and execution to the central control module, and after the central control module is started, receive the code of the sensor first for identifying the type of sensing, the central control module returns a successful receiving command after receiving the number, and the environment monitoring module starts sampling and sends the environment data. After the central control module receives the environment quantity, the starting and stopping conditions of the drive are set through the setting unit. When the implementation environment data monitored by the sensor reaches a starting threshold value of the drive, the central control module starts the drive and drives the corresponding execution module, and if the environment data is lower than a stopping threshold value, the drive is stopped, and the corresponding execution module also stops working. This flow accords with the logic that intelligent house carries out the operation according to the environment variation, has satisfied the teaching demand, and diversified sensor and execution module combination are cooperated again and are set up good drive in advance, can realize diversified intelligent control effect. Meets the expectations of various use environments.
In this embodiment, the "up, down, left, right" move button, "+/-" button, "clear" button, "set/confirm" button, "manual open drive" case is included. When the device is used, a setting link is entered through a setting/confirming button, cursor flickering occurs on a screen, a cursor is moved through an up, down, left and right moving button, a threshold value is set through a "+/-" button, and finally setting is completed by pressing the setting/confirming button.
All the drivers can be manually opened or closed through a manual opening driving case, and the operation and the stop of the execution module can be manually controlled and can be used for self-checking.
In this embodiment, if the differences between the execution modules corresponding to the drivers are larger, the commonality is small, and in order to simplify the operation process, all the drivers may be turned on when the start threshold is satisfied, so as to simplify the operation process.
In this embodiment, the central control module includes a power supply unit, where the power supply unit is configured to provide electric energy for the central control module, the environmental monitoring module, and the execution module. The environment monitoring module is connected with the central control module through a 4PIN PIN row needle/row seat. The entity product corresponding to the central control module is a control box, and the central control module can be divided into an inserting type and a charging type, wherein the charging type is more than the inserting type by an independent power supply. The power supply for the environment monitoring module and the execution module through the central control module has the advantages that the voltage reduction unit and the voltage stabilizing unit can be integrated in the power supply unit, the environment monitoring module and the execution module are plug and play, the integration level is high, the power supply problem is not needed to be considered additionally, and the operation is simple and easy to get up.
In this embodiment, the central control module includes a display screen, where the display screen is used to display real-time data of the sensor, a start threshold and an stop threshold of the drive. The driving starting threshold value and the driving stopping threshold value are displayed with real-time data through the display screen, the data are visualized, and students can understand the judgment logic and principle of intelligent furniture conveniently. It is also convenient to adjust the start threshold and the stop threshold of the drive by the setting unit.
In this embodiment, the power supply unit includes a charging circuit, a lithium battery, a boost circuit, and an LDO circuit. In this embodiment, 3.7V adopted by the lithium battery outputs 5V working voltage to drive through the boost circuit, and then the output voltage of the boost circuit is reduced to 3.3V through the LDO circuit to supply power to the environmental monitoring module, the MCU and the OLED display screen.
In this embodiment, the sensor is a temperature sensor and/or a humidity sensor and/or a soil humidity sensor and/or a human body sensor and/or a light intensity sensor and/or a distance sensor. The sensor is various, can reserve the forecast space of various service environment for the student, satisfy teaching inspiring, the teaching demand of standing on the contrary, through highly integrated drive and power supply unit, guide student's main vigor to the inspiring of thinking.
In this embodiment, the execution module includes a dc motor and/or an LED and/or an atomizing plate and/or a buzzer and/or a stepper motor. In the field of intelligent home, the same sensor and corresponding execution module are different, corresponding use scenes are different, various sensors and execution modules are matched, various combinations can be formed, the assumption of various scenes in real life is satisfied, and the education requirement is met.
The driving is preset, the driving signals are connected with pins of the MCU in advance according to the driving type, when the environmental data monitored by the sensor reaches the starting threshold value, the MCU simultaneously sends out all driving signals, and the driving signals corresponding to the driving can be intercepted through the dial switch, so that the purpose of opening or closing the corresponding driving is achieved.
In this embodiment, the driving circuit includes a dc motor drive and/or an LED drive and/or an atomizing sheet drive and/or a buzzer drive and/or a stepper motor drive.
In this embodiment, the central control module includes a plurality of dial switches, where the dial switches are used to control power supply of different driving circuits respectively. In order to simplify the operation, when the environmental value monitored by the sensor reaches a threshold value, all the drives are started, and when the number of the drives is large and conflict exists, part of the drives can be manually and actively closed through the dial switch.
Embodiment case 1: humidity sensor + atomizing piece drive + atomizing piece, through the start threshold value and the stop threshold value of preset humidity, constitute intelligent humidifier's control principle.
Embodiment case 2: the temperature sensor, the direct current motor and the direct current motor are driven, and a basic structure of the intelligent temperature-sensing fan is formed through a preset starting threshold value and a preset stopping threshold value of temperature.
Embodiment 3: soil humidity sensor + direct current motor drive + direct current motor, through the start threshold value and the stop threshold value of preset humidity, direct current motor drive water pump has constituted the basic structure that vegetation intelligence was irrigated.
Embodiment 4: the human body sensor, the LED drive and the LED form a basic structure of the induction lamp by presetting whether a human body is detected as a threshold value for starting and stopping the drive.
Embodiment case 5: distance sensor + direct current motor drive + direct current motor, through the start threshold value of preset distance, through direct current motor drive flip, constitute intelligent garbage bin's basic structure.
Embodiment 6: the light intensity sensor, the stepping motor drive and the stepping motor drive the curtain through a starting threshold value of preset illumination intensity, and the stepping motor drives the curtain to form a basic mechanism of the intelligent curtain.
In this embodiment, the number of the sensors is two or more environmental monitoring modules, and the setting unit includes "and" or "keys. When a plurality of environment monitoring modules are simultaneously accessed, more responsible judgment logic can be realized, a higher intelligent control effect is achieved, and the combination possibility and operability are greatly improved. In the teaching demonstration, there is bigger operating space.
Embodiment 7: the temperature sensor, the human body sensor, the direct current motor drive, the direct current motor, the LED and the LED drive, and the relationship between the two thresholds is 'and' through the threshold value of a preset temperature value and the threshold value of whether the human body is detected or not, and when the two thresholds are triggered simultaneously, the basic structure of the intelligent air conditioner can be formed.
Embodiment case 8: the humidity sensor, the light intensity sensor, the stepping motor and the stepping motor are driven, a humidity threshold value and a light intensity threshold value are set in advance, the relation of the two threshold values is "or", when one of the humidity sensor and the light intensity sensor reaches the threshold value, the stepping motor is started to drive the stepping motor to work, and the basic principle of identifying rainy days by the automatic clothes airing rod is formed.
In this embodiment, the central control module includes a timing unit, that is, only the start threshold and the start duration of the drive need to be set when in use.
Embodiment case 9: the human body sensor, the LED drive, the LED and the timing unit can add the concept of energy conservation on the basis of the induction lamp by presetting a starting threshold value and a driving working time of human body induction, and form a basic structure of the induction night lamp.
In another embodiment, the environment monitoring module and the central control module are provided with wireless transceiver units, the environment monitoring module and the central control module are connected through the wireless transceiver units, and the environment monitoring module is provided with a power supply unit. Through adding wireless transceiver unit, both can add remote control's such as internet and thing networking teaching demonstration again on intelligent furniture's basis. Compared with the environment monitoring module, the wireless transceiver unit can prolong the distance of data transmission through the wired connection central control module. The environment monitoring module can enable the sensor to be arranged at a position far away from the central control module by being provided with an independent power supply unit. In the teaching task, the intelligent home system can be demonstrated, remote induction control is demonstrated, and students can understand the Internet of things and the Internet thinking conveniently.
And the central control module is provided with a wireless receiving and transmitting unit, so that the central control module can be connected with mobile equipment such as a smart phone, and the smart phone replaces a display screen and a setting unit to perform data visualization and threshold setting. And simulating an Internet home system, and meeting Internet teaching.
In another embodiment, the wireless transceiver unit is a bluetooth connection module, a WiFi connection module, or an internet of things module. Different data transmission modes of different receiving and transmitting unit reasons meet the demands of education display.
Finally, it should be noted that: the foregoing description is only a preferred embodiment of the present invention, and the present invention is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present invention has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. An intelligent furniture teaching module, which is characterized by comprising: the intelligent furniture system comprises an environment monitoring module, a central control module and an execution module, wherein the environment monitoring module is used for simulating a triggering unit of intelligent furniture, the execution module is used for simulating a functional unit of the intelligent furniture, and the central control module is used for programming and setting an intelligent unit for executing logic simulation intelligent home;
the environment monitoring module is connected with the central control module and comprises one or two or more sensors, and different sensors are identified through code distinction;
the central control module is used for identifying the sensor through encoding and receiving the data of the sensor in real time;
the execution module is connected with the central control module and drives the execution module to execute actions through the central control module;
the central control module is provided with a driving unit and a setting unit, the driving unit comprises a plurality of driving circuits for driving the execution module, and the setting unit is used for setting a starting threshold value and an stopping threshold value of the driving circuits.
2. The intelligent furniture teaching module of claim 1, wherein the central control module comprises a power supply unit for providing electrical power to the central control module, the environmental monitoring module, and the execution module.
3. The intelligent furniture teaching module of claim 1, wherein the central control module comprises a display screen for displaying real-time data of the sensor, a start threshold and an abort threshold of the drive.
4. Intelligent furniture teaching module according to claim 1, characterized in that the sensor is a temperature sensor and/or a humidity sensor and/or a soil humidity sensor and/or a body sensor and/or a light intensity sensor and/or a distance sensor.
5. Intelligent furniture teaching module according to claim 1, characterized in that the execution module comprises a direct current motor and/or LEDs and/or atomizing sheets and/or buzzers and/or stepper motors.
6. The intelligent furniture teaching module according to claim 5, wherein the driving circuit comprises a direct current motor drive and/or an LED drive and/or an atomizing sheet drive and/or a buzzer drive and/or a stepper motor drive.
7. The intelligent furniture teaching module according to claim 6, wherein the central control module comprises a plurality of dial switches, and the dial switches are used for respectively controlling power supply of different driving circuits.
8. The intelligent furniture teaching module according to claim 1, wherein the environment monitoring module and the central control module are provided with wireless transceiver units, the environment monitoring module and the central control module are connected through the wireless transceiver units, and the environment monitoring module is provided with a power supply unit.
9. The intelligent furniture teaching module according to claim 8, wherein the wireless transceiver unit is a bluetooth connection module, a WiFi connection module, or an internet of things module.
10. The intelligent furniture teaching module according to claim 1, wherein the number of the sensors is two or more, and the setting unit includes an "and" or "key.
CN202211339047.1A 2022-10-28 2022-10-28 Intelligent furniture teaching module Pending CN116168568A (en)

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CN202211339047.1A CN116168568A (en) 2022-10-28 2022-10-28 Intelligent furniture teaching module

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Application Number Priority Date Filing Date Title
CN202211339047.1A CN116168568A (en) 2022-10-28 2022-10-28 Intelligent furniture teaching module

Publications (1)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104575168A (en) * 2014-12-26 2015-04-29 无锡清华信息科学与技术国家实验室物联网技术中心 Intelligent environment sensing and control experiment platform
CN206396505U (en) * 2016-11-30 2017-08-11 广东石油化工学院 A kind of intelligent clothes airing device
CN108445776A (en) * 2018-05-21 2018-08-24 王连队 A kind of intelligent home control system
CN208936424U (en) * 2018-09-28 2019-06-04 华侨大学 A kind of Intelligent air conditioner controller based on sensor and WiFi technology
CN213844389U (en) * 2020-12-31 2021-07-30 长春建筑学院 Multifunctional teaching aid device for education technology demonstration

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104575168A (en) * 2014-12-26 2015-04-29 无锡清华信息科学与技术国家实验室物联网技术中心 Intelligent environment sensing and control experiment platform
CN206396505U (en) * 2016-11-30 2017-08-11 广东石油化工学院 A kind of intelligent clothes airing device
CN108445776A (en) * 2018-05-21 2018-08-24 王连队 A kind of intelligent home control system
CN208936424U (en) * 2018-09-28 2019-06-04 华侨大学 A kind of Intelligent air conditioner controller based on sensor and WiFi technology
CN213844389U (en) * 2020-12-31 2021-07-30 长春建筑学院 Multifunctional teaching aid device for education technology demonstration

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