CN111818477B - Wireless energy-saving system and method - Google Patents
Wireless energy-saving system and method Download PDFInfo
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- CN111818477B CN111818477B CN202010704621.3A CN202010704621A CN111818477B CN 111818477 B CN111818477 B CN 111818477B CN 202010704621 A CN202010704621 A CN 202010704621A CN 111818477 B CN111818477 B CN 111818477B
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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
- H04W4/30—Services specially adapted for particular environments, situations or purposes
- H04W4/38—Services specially adapted for particular environments, situations or purposes for collecting sensor information
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/52—Indication arrangements, e.g. displays
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/54—Control or safety arrangements characterised by user interfaces or communication using one central controller connected to several sub-controllers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/56—Remote control
- F24F11/58—Remote control using Internet communication
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/02—Power saving arrangements
- H04W52/0209—Power saving arrangements in terminal devices
- H04W52/0225—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/02—Power saving arrangements
- H04W52/0209—Power saving arrangements in terminal devices
- H04W52/0225—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
- H04W52/0248—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal dependent on the time of the day, e.g. according to expected transmission activity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/20—Humidity
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- Computer Networks & Wireless Communication (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- General Physics & Mathematics (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a wireless energy-saving system and a method, wherein the system consists of a data acquisition node, a routing node and a coordinator node, and the coordinator node in the system establishes a network and then adds the data acquisition node and the routing node into the network and maintains the stability of the network; the data acquisition node detects the opening and closing state and temperature and humidity data of the position, displays real-time temperature and humidity, and realizes wireless data transmission; the routing node collects data of the data acquisition nodes distributed at different positions and transmits the data to the control systems of various electrical appliances, and the control systems of the electrical appliances regulate the electrical appliances, so that the energy conservation and emission reduction effects are achieved.
Description
Technical Field
The invention particularly relates to a wireless energy-saving system and a wireless energy-saving method, and belongs to the technical field of energy conservation.
Background
At present, the use of electrical appliances such as air conditioners meets the requirements of people on the temperature and the humidity of the environment, the requirement of industrial places on the environment with constant temperature or low temperature is also met, but a large amount of power resources are still wasted, and therefore, a certain energy-saving strategy is adopted. Most of the existing energy-saving technologies are started from a hardware angle or a large number of sensors are installed in a pipeline and a room, wired connection transmission is mostly used, the functions of data display are not available, the installation is difficult, the functions are single, and the use cost is too high.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, provides a wireless energy-saving system and a wireless energy-saving method, aims at the requirement that energy consumption of electrical appliances such as central air conditioners in places such as household, commercial, industrial and medical use needs to be reduced, monitors the opening and closing states of devices such as doors and windows and temperature and humidity data by combining a temperature and humidity sensor and a wireless transmission technology, transmits the data to an electrical appliance control system for switching and state adjustment, reduces the energy consumption of indoor electrical appliances, and improves the energy utilization rate.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
in a first aspect, the invention provides a wireless energy-saving system, which comprises a data acquisition node, a routing node and a coordinator node, wherein the data acquisition node and the routing node are connected with a common network constructed by the coordinator node;
the data acquisition node comprises an opening and closing detection module, a temperature and humidity detection module and a display module which are connected with a first power module and a first controller, wherein the first power module is connected with the first controller; the data acquisition node also comprises a magnet, and the magnet is arranged on a movable device;
the routing node comprises a second controller and a second power supply module connected with the second controller; the routing node is connected with an electric appliance control system;
the coordinator node includes a third controller, and a third power module connected to the third controller.
With reference to the first aspect, the opening and closing detection module includes a reed pipe, a reed in the reed pipe is magnetized when approaching a magnet, the opening and closing information of the device is converted into a level signal, and the opening and closing detection module is opened or closed correspondingly.
Furthermore, the magnet is a magnet with adjustable magnetism, the gap between the magnetic poles of the magnet is adjusted by utilizing a knob, the magnetic field intensity distribution generated by the magnetic poles is adjusted, and the magnetized distance between the reed pipe and the magnet is further adjusted; the opening and closing detection module can set a critical value of the magnetization distance between the reed pipe and the magnet through the magnet knob, and the critical distance between the opening state and the closing state can be adjusted.
Further, the first power module is connected with the temperature and humidity detection module, and is connected with the first controller and the display module after being subjected to voltage reduction through the REG1117 chip; the second power module adopts a 3.3V rechargeable lithium battery to supply power for the second main controller, and the third power module adopts a 3.3V rechargeable lithium battery to supply power for the third main controller.
Further, the first controller, the second controller and the third controller all adopt CC2530 chips based on a wireless sensing technology.
Furthermore, the first main controller is internally provided with a clock chip and a wireless communication module which are connected.
Furthermore, the second controller is connected with the electric appliance control system in a serial port mode.
Furthermore, the data acquisition nodes and the routing nodes are installed in a plurality of places, and the routing nodes identify the position information of the data acquisition nodes and filter the information of the data acquisition nodes in other places.
In a second aspect, the present invention provides a wireless power saving method, including the following steps:
after the coordinator node is electrified, carrying out initialization configuration to construct a common network;
after the data acquisition nodes are electrified, initialization configuration is carried out, the data acquisition nodes are accessed to a common network, and detection and data transmission of the opening and closing state of the device and acquisition, display and transmission of temperature and humidity data are carried out;
and after being electrified, the routing nodes carry out initialization configuration and access to a common network, receive the acquisition information of the data acquisition nodes and transmit the data to the electric appliance control system.
With reference to the second aspect, further, the data acquisition node performs detection and data transmission of the opening and closing state of the device, and acquires, displays and transmits temperature and humidity data, and includes the following steps:
after the data acquisition node is powered on, carrying out initialization configuration, accessing the data acquisition node to a common network, and detecting the opening and closing state of the device;
when the state of the device is detected to be opened, the data acquisition node enters a dormant state and waits for the state of the device to change;
when the device is in a closed state or is switched from an open state to a closed state, the data acquisition node acquires temperature and humidity data once every fixed time interval and transmits the data to the routing node;
after the collection process is finished, the data collection node enters a dormant state;
when the next acquisition process comes, the data acquisition node automatically exits the dormancy process through interruption, and data acquisition and data transmission are carried out again.
Compared with the prior art, the invention has the following beneficial effects:
according to the wireless energy-saving system and method, the switch of the electric appliances such as the air conditioner is controlled through the data detection node, the routing node and the coordinator node, so that the energy-saving and emission-reduction effects are achieved, the temperature and humidity data can be detected and fed back, and the somatosensory temperature and humidity are always in a comfortable area.
Drawings
Fig. 1 is a schematic structural diagram of a wireless energy saving system according to an embodiment of the present invention;
FIG. 2 is a flow chart of the data detection node according to an embodiment of the present invention;
fig. 3 is a flow chart of the operation of a routing node according to an embodiment of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
As shown in fig. 1, which is a schematic structural diagram of a wireless energy saving system according to an embodiment of the present invention, the system is based on a CC2530 chip and is composed of a data acquisition node, a routing node, a coordinator node, and the like. The system utilizes a data acquisition node to detect the opening and closing state and temperature and humidity data of the position, displays real-time temperature and humidity, and realizes wireless data transmission; collecting data of data acquisition nodes distributed at different positions by using a routing node, transmitting the data to an electric appliance control system, and constructing a network by using a coordinator node;
the data acquisition node is arranged on a wall body or other fixed positions beside a device for controlling indoor and outdoor air circulation of devices such as doors and windows according to requirements and actual conditions, and a matched magnet is arranged on a movable device such as doors and windows; the data acquisition node completes detection and transmission of opening and closing states of devices such as doors and windows and the like, and acquisition, display and transmission of temperature and humidity data; the data acquisition node comprises a first controller, an opening and closing state detection module, a temperature and humidity detection module, a display module and a first power module. The data acquisition node can realize opening and closing information of the detection device, acquisition of temperature and humidity data, real-time display of temperature and humidity information, wireless transmission of opening and closing information and temperature and humidity information.
The opening and closing state detection module adopts an MKA10110 normally-open reed pipe, an adjustable magnet and a knob, when the adjustable magnet is close to a reed, the magnetic field where the reed is located is magnetized when reaching a certain strength, the state of a normally-open node of the reed pipe is changed, the level of a connected pin is controlled to change, and the two states are correspondingly opened and closed; meanwhile, the gap between the magnetic poles of the magnet can be adjusted through the knob, the magnetic field intensity distribution generated by the magnetic poles is adjusted, the magnetized distance between the reed pipe and the magnet is further adjusted, and the distance critical value between the reed pipe and the magnet corresponding to the opening and closing states is adjusted.
The opening and closing information comprises two states of opening and closing of the corresponding device, and a critical value for switching between the two states is set to be between the fully closed state and the fully opened state of the device through the knob. The switching threshold between states is set in the corresponding electrical appliance control system according to the specific function requirements of various electrical appliances. The corresponding relation between the turning-off or working of the electric appliance and the turning-on number of the devices in the same place, which is lower than or higher than the threshold value, is set in the corresponding electric appliance control system according to the specific functions and the specific requirements of the electric appliance.
The first controller adopts a CC2530 chip, uses a monocycle 8051 kernel, is embedded with a wireless signal transceiver supporting an IEEE 802.15.4 protocol, is connected with the opening and closing state detection module, the temperature and humidity detection module and the display module, and is responsible for receiving data and wirelessly transmitting the data to the routing node.
The temperature and humidity detection module adopts a DHT11 digital temperature and humidity sensor which has calibrated digital signal output and is low in price, small in size and low in power consumption; the display module adopts a 0.49-inch (64 × 32) OLED display screen driven by an SSD1306, and is used for displaying temperature and humidity information.
The first power supply module adopts a 5V rechargeable lithium battery for power supply, and if the electric quantity of the lithium battery is exhausted, the lithium battery can be independently and quickly charged, so that the use repeatability is improved; the first power module supplies power for the DHT11 digital temperature and humidity sensor based on 5V voltage, and the REG1117 chip is adopted to convert the 5V voltage into 3.3V voltage, so that the power is supplied to the controller module and the display module, and meanwhile, the required voltage can be automatically adjusted through adjusting the resistance according to the specific requirements of other modules.
The routing node is arranged near a host of an electric appliance such as an air conditioner and the like, receives opening and closing state information and temperature and humidity data of devices such as doors and windows and the like acquired by the data acquisition node, and transmits a data serial port to a control system of the electric appliance such as the air conditioner and the like; the routing node includes a second controller and a second power module.
The second controller adopts a CC2530 chip, can receive wirelessly transmitted data and transmits the data to a control system of an electric appliance such as an air conditioner, and the like, and the second power supply module adopts a 3.3V rechargeable lithium battery to supply power to the routing node main controller;
the coordinator node comprises a third controller and a third power module, realizes the construction of a common network, enables the data acquisition node and the routing node to be added into the common network, and is responsible for the maintenance of the network. The third controller adopts a CC2530 chip and is responsible for the construction and maintenance of a network, and the third power module adopts a 3.3V rechargeable lithium battery to supply power to the coordinator node main controller;
as shown in fig. 2, which is a work flow diagram of a data detection node according to an embodiment of the present invention, a data acquisition node is powered on and then initially configured and accessed to a network; the data acquisition node detects the opening and closing states of devices such as doors and windows and sends state information to the routing node; when the devices such as doors and windows are closed, the temperature and humidity detection module does not work, the data acquisition node enters a dormant state, waits for the state change of the devices such as doors and windows, and automatically exits the dormant process and transmits data by interruption; when the door and window and other devices are opened, collecting temperature and humidity data and opening and closing information every 30 seconds, and wirelessly transmitting the data to a routing node; after the single acquisition process is finished, the data acquisition node enters a dormant state to reduce energy consumption, and the dormant timer enters a working state; when the next acquisition process comes, the sleep process is automatically exited through the interruption of the sleep timer, and data acquisition and data transmission are carried out again; the display module works independently, and can detect and display the temperature and the humidity in real time after the button is pressed.
The data received by the electric appliance control system is the opening or closing state of all devices in the same place, the electric appliances are controlled to be closed or work according to the opening number of the devices, the electric appliance control system correspondingly increases or decreases in functions in various electric appliances, and part of the electric appliance control system has the function of controlling the environmental temperature and humidity, and the output temperature and humidity are dynamically adjusted through a built-in automatic adjusting system according to the received temperature and humidity information.
As shown in fig. 3, a routing node work flow diagram according to an embodiment of the present invention includes the following specific work flows: after being electrified, the routing node carries out initialization configuration and accesses the network; the routing node receives opening and closing information and temperature and humidity information of devices such as doors and windows sent by the data acquisition node; after the routing node receives the information, the opening and closing information and the temperature and humidity information of the devices such as doors and windows are transmitted to a control system of the electrical appliances such as an air conditioner.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (6)
1. A wireless power saving method, comprising the steps of:
after the coordinator node is electrified, carrying out initialization configuration to construct a common network;
after the data acquisition nodes are electrified, initialization configuration is carried out, the data acquisition nodes are accessed to a common network, and detection and data transmission of the opening and closing state of the device and acquisition, display and transmission of temperature and humidity data are carried out;
after being electrified, the routing nodes are initialized and accessed to a common network, receive the acquisition information of the data acquisition nodes and transmit the data to the electric appliance control system;
the data acquisition node detects the opening and closing state of the device, transmits data, acquires, displays and transmits temperature and humidity data, and comprises the following steps:
after the data acquisition node is powered on, carrying out initialization configuration, accessing the data acquisition node to a common network, and detecting the opening and closing state of the device;
when the state of the device is detected to be opened, the data acquisition node enters a dormant state and waits for the state of the device to change;
when the device is in a closed state or is switched from an open state to a closed state, the data acquisition node acquires temperature and humidity data once every fixed time interval and transmits the data to the routing node;
after the collection process is finished, the data collection node enters a dormant state;
when the next acquisition process comes, the data acquisition node automatically exits the dormancy process through interruption, and data acquisition and data transmission are carried out again.
2. A wireless energy-saving system comprising the method of claim 1, comprising a data acquisition node, a routing node and a coordinator node, wherein the data acquisition node and the routing node are connected to a common network constructed by the coordinator node;
the data acquisition node comprises an opening and closing detection module, a temperature and humidity detection module and a display module which are connected with a first power module and a first controller, wherein the first power module is connected with the temperature and humidity detection module, and is connected with the first controller and the display module after being subjected to voltage reduction through a REG1117 chip; the data acquisition node also comprises a magnet, and the magnet is arranged on a movable device;
the magnet is a magnet with adjustable magnetism, the gap between the magnetic poles of the magnet is adjusted by utilizing a knob, the magnetic field intensity distribution generated by the magnetic poles is adjusted, and the magnetized distance between the reed pipe and the magnet is further adjusted; the opening and closing detection module can set a critical value of the magnetization distance between the reed pipe and the magnet through the magnet knob, so that the critical distance between the opening state and the closing state can be adjusted;
the routing node comprises a second controller and a second power module connected with the second controller, and the second power module adopts a 3.3V rechargeable lithium battery to supply power to a second main controller; the routing node is connected with an electric appliance control system;
the data acquisition nodes and the routing nodes are installed in a plurality of places, and the routing nodes identify the position information of the data acquisition nodes and filter the information of the data acquisition nodes in other places;
the coordinator node comprises a third controller and a third power module connected with the third controller, and the third power module adopts a 3.3V rechargeable lithium battery to supply power to a third main controller.
3. The wireless energy-saving system according to claim 2, wherein the opening and closing detection module comprises a reed switch, a reed in the reed switch is magnetized when approaching a magnet, the opening and closing information of the device is converted into a level signal, and the opening and closing detection module is correspondingly opened or closed.
4. The wireless energy-saving system of claim 2, wherein the first controller, the second controller and the third controller are all CC2530 chips based on wireless sensing technology.
5. The wireless energy-saving system of claim 2, wherein the first main controller is internally provided with a clock chip and a wireless communication module which are connected.
6. The wireless energy-saving system of claim 2, wherein the second controller is connected with the electrical appliance control system in a serial port mode.
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| CN112097381B (en) * | 2020-09-22 | 2022-04-08 | 河海大学常州校区 | Air conditioner energy-saving system capable of continuously and autonomously charging and method thereof |
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| CN103809558A (en) * | 2014-01-16 | 2014-05-21 | 浙江工业大学 | Multifunctional home environment monitoring device |
| CN106652479A (en) * | 2016-11-22 | 2017-05-10 | 广西大学 | Geomagnetic sensing-based wireless low-power consumption parking space detection system |
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| US9251697B2 (en) * | 2012-03-21 | 2016-02-02 | Invensys Systems, Inc. | Means for pairing a hermetically sealed wireless device |
| CN103529814B (en) * | 2013-10-30 | 2016-01-20 | 复旦大学无锡研究院 | A kind of Cold Chain Logistics master-slave radio sensing node supervisory system |
| CN104566828A (en) * | 2015-01-16 | 2015-04-29 | 江苏工程职业技术学院 | Zigbee technology based central air-conditioning cold source monitoring system and method |
| CN205117059U (en) * | 2015-11-13 | 2016-03-30 | 北京艾科斯玛特自动化控制技术有限公司 | Intelligent door and window controlling system |
| CN105530476A (en) * | 2015-12-22 | 2016-04-27 | 北京奇虎科技有限公司 | Intelligent security protection system configuration method and apparatus |
| CN206196060U (en) * | 2016-11-10 | 2017-05-24 | 贵州大学 | Laboratory environment monitoring system based on zigBee technique |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103809558A (en) * | 2014-01-16 | 2014-05-21 | 浙江工业大学 | Multifunctional home environment monitoring device |
| CN106652479A (en) * | 2016-11-22 | 2017-05-10 | 广西大学 | Geomagnetic sensing-based wireless low-power consumption parking space detection system |
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