CN111852251A - Intelligent door and window communication system - Google Patents
Intelligent door and window communication system Download PDFInfo
- Publication number
- CN111852251A CN111852251A CN202010708597.0A CN202010708597A CN111852251A CN 111852251 A CN111852251 A CN 111852251A CN 202010708597 A CN202010708597 A CN 202010708597A CN 111852251 A CN111852251 A CN 111852251A
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- Prior art keywords
- door
- window
- communication system
- glass
- zigbee wireless
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- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05F—DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION; CHECKS FOR WINGS; WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
- E05F15/00—Power-operated mechanisms for wings
- E05F15/70—Power-operated mechanisms for wings with automatic actuation
- E05F15/72—Power-operated mechanisms for wings with automatic actuation responsive to emergency conditions, e.g. fire
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- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
- E05B45/00—Alarm locks
- E05B45/06—Electric alarm locks
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- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
- E05B49/00—Electric permutation locks; Circuits therefor ; Mechanical aspects of electronic locks; Mechanical keys therefor
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- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
- E05B51/00—Operating or controlling locks or other fastening devices by other non-mechanical means
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- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05F—DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION; CHECKS FOR WINGS; WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
- E05F15/00—Power-operated mechanisms for wings
- E05F15/70—Power-operated mechanisms for wings with automatic actuation
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05F—DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION; CHECKS FOR WINGS; WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
- E05F15/00—Power-operated mechanisms for wings
- E05F15/70—Power-operated mechanisms for wings with automatic actuation
- E05F15/77—Power-operated mechanisms for wings with automatic actuation using wireless control
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- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
- E06B5/00—Doors, windows, or like closures for special purposes; Border constructions therefor
- E06B5/10—Doors, windows, or like closures for special purposes; Border constructions therefor for protection against air-raid or other war-like action; for other protective purposes
- E06B5/11—Doors, windows, or like closures for special purposes; Border constructions therefor for protection against air-raid or other war-like action; for other protective purposes against burglary
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- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
- E06B7/00—Special arrangements or measures in connection with doors or windows
- E06B7/28—Other arrangements on doors or windows, e.g. door-plates, windows adapted to carry plants, hooks for window cleaners
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
- G08B21/02—Alarms for ensuring the safety of persons
- G08B21/12—Alarms for ensuring the safety of persons responsive to undesired emission of substances, e.g. pollution alarms
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/80—Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Civil Engineering (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Structural Engineering (AREA)
- Signal Processing (AREA)
- General Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Power-Operated Mechanisms For Wings (AREA)
Abstract
The invention discloses an intelligent door and window communication system, which comprises a communication door and window host, and is characterized in that: the inner cavity of the communication door and window host comprises a ZigBee wireless communication module, a door magnetic detector, a door lock switch controller, an air purification driver, a temperature and humidity sensor, a glass breaking detector, a window switch driver, a curtain switch driver, a gas detection and control device, a smoke induction alarm, a glass dimming controller, a gas detection and control device, a smoke induction alarm and a ZigBee wireless communication module, when the system detects abnormal signals such as gas, harmful gas or smoke, the signal detected by the sensor is fed back to the door and window communication host computer, the door and window communication host computer sends out an instruction immediately to open the door and window, thereby avoiding fire or gas poisoning, can control door and window through mobile client, can also carry out the scene mode setting according to daily life custom, realize timing control at the appointed time, great improvement quality of life and factor of safety.
Description
Technical Field
The invention relates to the technical field of intelligent equipment, in particular to an intelligent door and window communication system.
Background
With the continuous development of economy, people desire the need of improving the quality of life, especially the attention degree of family safety, although the theft is less and less with the improvement of the overall quality of people, the theft still exists, and accidents caused by gas leakage and the like also exist, so that in order to avoid the accidents, in addition, like no one in the rainy family, the fact that the window cannot be closed causes that the humidity in the family is heavy is a very headache for many people, if the intelligent door and window can be remotely controlled, the situation can be avoided, and the current people pay more attention to enjoyment, such as long and heavy curtains of compound buildings, if the curtain is opened in the morning and closed at night, the curtain is manually opened every day, and the common door and window can not meet the living requirements of people, so that an intelligent door and window remote control system is very necessary in life.
Disclosure of Invention
The invention aims to provide an intelligent door and window communication system to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides an intelligent door and window communication system, includes communication door and window host computer, its characterized in that: the inner cavity of the communication door and window host comprises a ZigBee wireless communication module, a door magnetic detector, a door lock switch controller, an air purification driver, a temperature and humidity sensor, a glass breakage detector, a window switch driver, a curtain switch driver, a gas detection and control device, a smoke induction alarm and a glass dimming controller.
Preferably, the ZigBee wireless communication module is a wireless network protocol of low-speed short-distance transmission, the bottom layer adopts a medium access layer and a physical layer of IEEE 802.15.4 standard specification, the ZigBee wireless communication module is suitable for a series of electronic component devices with short transmission range and low data transmission rate, and the ZigBee wireless communication module is arranged on each indoor intelligent door and window.
Preferably, the door and window communication host is in radio frequency communication connection with the mobile client through the ZigBee wireless communication module, and the mobile client comprises a mobile phone and a tablet.
Preferably, the door and window communication host comprises a power supply commutation circuit and a power supply switch circuit which are connected.
Preferably, the glass breaking detector can effectively detect the high-frequency glass breaking sound of 10 k-15 kHZ, and the height of the sound emission frequency of the glass breaking sound and the intensity are related to the thickness and the area of the glass.
Preferably, the temperature and humidity sensor adopts a digital integrated sensor as a probe and is provided with a digital processing circuit, so that the temperature and the relative humidity in the environment are converted into corresponding standard analog signals, 4-20mA, 0-5V or 0-10V, and the temperature and humidity sensor can simultaneously convert the changes of the temperature and the humidity into the changes of current/voltage values.
Preferably, the door sensor is composed of a permanent magnet and a wireless door sensor main body, the permanent magnet and the wireless door sensor main body are generally arranged above or on the edge of the inner side of a door, a permanent magnet is arranged in the inner cavity of the permanent magnet, a normally open reed pipe is arranged in the inner cavity of the wireless door sensor main body, when the distance between the permanent magnet and the reed pipe is less than 5 millimeters, the door sensor is in a working waiting state, and after the permanent magnet is away from the reed pipe for a certain distance, the wireless door sensor immediately transmits a 315MHZ high-frequency radio signal containing an address code and a self identification code.
Preferably, the door lock switch controller comprises a power supply circuit and a single chip microcomputer, a door lock state switching value input terminal and two door switch switching value input terminals are fixedly connected to the single chip microcomputer, and a BEEP output signal of the single chip microcomputer is connected with the alarm through a buzzer amplifier.
Preferably, the glass dimming controller comprises a zero crossing detection circuit, a photoelectric coupler, a microprocessor circuit, a signal control circuit, an IGBT drive circuit, a chopper power switch voltage stabilization detection circuit and an overvoltage protection circuit, wherein the model of a microprocessor chip is CY8C29566, the model of an insulated gate bipolar transistor IGBT drive module is MC33153D, the model of a differential signal control chip is MAX485, the model of the photoelectric coupler is EL817S, and an insulated gate bipolar transistor IGBT power tube is FGA25N120ANTD, and the glass dimming controller is connected with the mobile client through a ZigBee wireless communication module and radio frequency communication through the ZigBee wireless communication module.
Compared with the prior art, the invention has the beneficial effects that:
1. this intelligent door and window communication system, gas detection and control ware, smoke induction alarm, zigBee wireless communication module's cooperation is used, when the system detects gas and harmful gas or smog and so on abnormal signal, the signal feedback that the sensor will detect at once is to door and window communication host computer on, door and window communication host computer send the instruction at once, open door and window, automatic alarm simultaneously to send alert feelings to mobile client, avoid taking place conflagration or gas poisoning.
2. This intelligent door and window communication system can control door and window through mobile client, can also carry out the scene mode setting according to daily life custom, realizes timing control at the appointed time, great improvement quality of life and factor of safety.
3. This intelligent door and window communication system, broken detector of glass provide simple and convenient, nimble mounting means, and its sound and vibrations monitoring sensitivity are regulatable, and the broken detector of glass production can feed back information to door and window communication host computer and automatic alarm at once when glass is broken reports to the police, can prevent illegal invasion.
4. The intelligent door and window communication system realizes a plurality of intelligent function anti-theft doors by taking the door and window communication host as a carrier through a new technical means, adopts a design without a key hole, and really and effectively blocks a channel unlocked by a thief technology.
5. This intelligent door and window communication system, zigBee wireless communication module compare in traditional network communication technology, and zigBee wireless communication technology demonstrates more high-efficient, convenient characteristic, possesses the advantage of low cost, low-power consumption, and the suitability is wider, can especially install in a series of fixed, portable mobile terminal conveniently, and meanwhile, zigBee wireless communication technology still can realize the GPS function.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural view of the present invention;
FIG. 3 is a schematic structural view of the present invention;
fig. 4 is a flow chart of the present invention.
In the figure: ZigBee wireless communication module, door magnetic detector, door lock switch controller, air purification driver, temperature and humidity sensor, glass breakage detector, window switch driver, curtain switch driver, gas detector controller, smoke induction alarm, glass dimming controller.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-4, the present invention provides a technical solution: an intelligent door and window communication system comprises a communication door and window host, wherein an inner cavity of the communication door and window host comprises a ZigBee wireless communication module, a door magnetic detector, a door lock switch controller, an air purification driver, a temperature and humidity sensor, a glass breakage detector, a window switch driver, a curtain switch driver, a gas detection controller, a smoke induction alarm and a glass dimming controller, the ZigBee wireless communication module is a wireless internet protocol for low-speed short-distance transmission, a bottom layer adopts a media access layer and a physical layer which are specified by IEEE 802.15.4 standard, and is suitable for being used among a series of electronic component devices with short transmission range and low data transmission rate, each indoor intelligent door and window is provided with a ZigBee wireless communication module, the door and window communication host is in radio frequency communication connection with a mobile client through the ZigBee wireless communication module, and the mobile client comprises a mobile phone and a flat plate, the door and window communication host comprises a power supply phase change circuit and a power supply switch circuit which are connected, a glass breaking detector can effectively detect high-frequency glass breaking sound of 10-15 kHZ, the high and low sound emission frequency and the intensity of the glass breaking are related to the thickness and the area of glass, a temperature and humidity sensor adopts a digital integrated sensor as a probe and is matched with a digital processing circuit so as to convert the temperature and the relative humidity in the environment into standard analog signals corresponding to the temperature and the relative humidity, 4-20mA, 0-5V or 0-10V, the temperature and humidity sensor can simultaneously convert the change of the temperature and the humidity into the change of current/voltage, a door magnetic detector consists of a permanent magnet and a wireless door magnetic main body, the door magnetic detector is generally arranged above or on the inner side of a door, the inner cavity of the permanent magnet is provided with a permanent magnet, and the inner cavity of the wireless door magnetic main body is provided with, when the distance between the permanent magnet and the reed pipe is less than 5 mm, the door magnetic sensor is in a working waiting state, when the permanent magnet is away from the reed pipe for a certain distance, the wireless door magnetic sensor immediately transmits 315MHZ high-frequency radio signals containing address codes and self identification codes, the door lock switch controller comprises a power supply circuit and a single chip microcomputer, a door lock state switching value input terminal and two door switch switching value input terminals are fixedly connected to the single chip microcomputer, BEEP output signals of the single chip microcomputer are connected with an alarm through a buzzer amplifier, the glass dimming controller consists of a zero-crossing detection circuit, a photoelectric coupler, a microprocessor circuit, a signal control circuit, an IGBT driving circuit, a chopping power switch voltage-stabilizing detection circuit and an overvoltage protection circuit, the model of the microprocessor chip is CY8C29566, and the model of the IGBT driving module is MC33153D, the model of the differential signal control chip is MAX485, the model of the photoelectric coupler is EL817S, the IGBT power tube is FGA25N120ANTD, and radio frequency communication connection is carried out between the power tube and the mobile client through the ZigBee wireless communication module and the ZigBee wireless communication module.
The working principle is as follows: when the intelligent door and window communication system is used, firstly, a ZigBee wireless communication module is required to be installed on each intelligent door and window, the intelligent door and window system is realized by taking a door and window communication host as a carrier and taking a mobile client as a control source, firstly, the information acquisition standard of each controller can be set through the mobile client, the controller is connected with an alarm and is in signal connection with the ZigBee wireless communication module, the information is fed back to the door and window communication host while the information is acquired, the signal transmitted by the door and window communication host through a data converter is subjected to data analysis and whether the alarm standard is met is judged according to the information set by a terminal, if the alarm standard is met, the signal is transmitted to the alarm through the ZigBee wireless communication module and is fed back to the mobile client through an A/D data converter, and according to daily life habits, the intelligent door lock is characterized in that a scene mode is set, timing control is achieved at a specified time, if a getting-up mode and a sleeping mode are set, the intelligent door lock is early morning, when a user wakes up, a curtain is automatically opened, the user can meet a new day, the curtain can be automatically closed at night, a silent rest environment is created, remote control of the intelligent door lock brings convenience for out-of-home friends, even if the intelligent door lock is not at home, the user wants to enter the home of the user, and the intelligent door and window communication can be achieved by sending an instruction through a mobile phone.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. The utility model provides an intelligent door and window communication system, includes communication door and window host computer, its characterized in that: the inner cavity of the communication door and window host comprises a ZigBee wireless communication module, a door magnetic detector, a door lock switch controller, an air purification driver, a temperature and humidity sensor, a glass breakage detector, a window switch driver, a curtain switch driver, a gas detection and control device, a smoke induction alarm and a glass dimming controller.
2. The smart door/window communication system according to claim 1, wherein: the ZigBee wireless communication module is a wireless network protocol for low-speed short-distance transmission, the bottom layer adopts a media access layer and a physical layer which are specified by IEEE802.15.4 standard, the ZigBee wireless communication module is suitable for being arranged among a series of electronic component devices with short transmission range and low data transmission rate, and the ZigBee wireless communication module is arranged on each indoor intelligent door and window.
3. The smart door/window communication system according to claim 1, wherein: the door and window communication host is in radio frequency communication connection with the mobile client through the ZigBee wireless communication module, and the mobile client comprises a mobile phone and a tablet.
4. The smart door/window communication system according to claim 1, wherein: the door and window communication host comprises a power supply commutation circuit and a power supply switch circuit which are connected.
5. The smart door/window communication system according to claim 1, wherein: the glass breaking detector can effectively detect the high-frequency glass breaking sound of 10 k-15 kHZ, and the height of the sound emission frequency of the broken glass and the intensity are related to the thickness and the area of the glass.
6. The smart door/window communication system according to claim 1, wherein: the temperature and humidity sensor adopts a digital integrated sensor as a probe and is matched with a digital processing circuit, so that the temperature and the relative humidity in the environment are converted into corresponding standard analog signals, 4-20mA, 0-5V or 0-10V, and the temperature and humidity sensor can simultaneously convert the changes of the temperature and the humidity into the changes of current/voltage values.
7. The smart door/window communication system according to claim 1, wherein: the door magnetic detector is composed of a permanent magnet and a wireless door magnetic main body, the door magnetic detector is generally installed above or on the edge of the inner side of a door, a permanent magnet is arranged in the inner cavity of the permanent magnet, a normally open reed pipe is arranged in the inner cavity of the wireless door magnetic main body, when the distance between the permanent magnet and the reed pipe is smaller than 5 mm, the door magnetic sensor is in a working waiting state, and after the permanent magnet leaves the reed pipe for a certain distance, the wireless door magnetic sensor immediately transmits a high-frequency radio signal of 315MHZ containing address codes and self identification codes.
8. The smart door/window communication system according to claim 1, wherein: the door lock switch controller comprises a power supply circuit and a single chip microcomputer, a door lock state switching value input terminal and two door switch switching value input terminals are fixedly connected to the single chip microcomputer, and BEEP output signals of the single chip microcomputer are connected with an alarm through a buzzer amplifier.
9. The smart door/window communication system according to claim 1, wherein: the glass dimming controller is composed of a zero crossing detection circuit, a photoelectric coupler, a microprocessor circuit, a signal control circuit, an IGBT driving circuit, a chopping power switch voltage stabilization detection circuit and an overvoltage protection circuit, wherein the model of a microprocessor chip is CY8C29566, the model of an insulated gate bipolar transistor IGBT driving module is MC33153D, the model of a differential signal control chip is MAX485, the model of the photoelectric coupler is EL817S, and an insulated gate bipolar transistor IGBT power tube is FGA25N120ANTD, and the glass dimming controller is connected with a mobile client through a ZigBee wireless communication module and a ZigBee wireless communication module in a radio frequency communication mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010708597.0A CN111852251A (en) | 2020-07-22 | 2020-07-22 | Intelligent door and window communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010708597.0A CN111852251A (en) | 2020-07-22 | 2020-07-22 | Intelligent door and window communication system |
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| CN111852251A true CN111852251A (en) | 2020-10-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010708597.0A Pending CN111852251A (en) | 2020-07-22 | 2020-07-22 | Intelligent door and window communication system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114753741A (en) * | 2022-04-08 | 2022-07-15 | 上海博乐之星节能科技有限公司 | Intelligent door and window control system |
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| CN201837859U (en) * | 2010-09-14 | 2011-05-18 | 镇江市旋丽电器有限公司 | Smart glass controller |
| CN202164923U (en) * | 2011-06-08 | 2012-03-14 | 郑忠荣 | Intelligent door and window controlling system |
| CN105275306A (en) * | 2015-11-13 | 2016-01-27 | 北京艾科斯玛特自动化控制技术有限公司 | Control system for intelligent door and window and method |
| CN106054821A (en) * | 2015-10-04 | 2016-10-26 | 易永安 | Intelligent door and window control system and control method |
| CN106297160A (en) * | 2015-05-29 | 2017-01-04 | 天津鹦鹉螺科技有限公司 | A kind of novel intelligent integration house security warning system |
| CN206096907U (en) * | 2016-08-29 | 2017-04-12 | 成都科达光电技术有限责任公司 | Building door and window safety control system |
| US20170191287A1 (en) * | 2015-12-30 | 2017-07-06 | Google Inc. | Door lock |
| CN206608028U (en) * | 2017-03-20 | 2017-11-03 | 荆楚理工学院 | A kind of automatic switch window system based on smoke sensing and humidity inductive |
-
2020
- 2020-07-22 CN CN202010708597.0A patent/CN111852251A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201837859U (en) * | 2010-09-14 | 2011-05-18 | 镇江市旋丽电器有限公司 | Smart glass controller |
| CN202164923U (en) * | 2011-06-08 | 2012-03-14 | 郑忠荣 | Intelligent door and window controlling system |
| CN106297160A (en) * | 2015-05-29 | 2017-01-04 | 天津鹦鹉螺科技有限公司 | A kind of novel intelligent integration house security warning system |
| CN106054821A (en) * | 2015-10-04 | 2016-10-26 | 易永安 | Intelligent door and window control system and control method |
| CN105275306A (en) * | 2015-11-13 | 2016-01-27 | 北京艾科斯玛特自动化控制技术有限公司 | Control system for intelligent door and window and method |
| US20170191287A1 (en) * | 2015-12-30 | 2017-07-06 | Google Inc. | Door lock |
| CN206096907U (en) * | 2016-08-29 | 2017-04-12 | 成都科达光电技术有限责任公司 | Building door and window safety control system |
| CN206608028U (en) * | 2017-03-20 | 2017-11-03 | 荆楚理工学院 | A kind of automatic switch window system based on smoke sensing and humidity inductive |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114753741A (en) * | 2022-04-08 | 2022-07-15 | 上海博乐之星节能科技有限公司 | Intelligent door and window control system |
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