Control system for exhibition hall lighting circuit

A control system for exhibition hall lighting circuit includes a first light intensity sensor, a second light intensity sensor, a data analysis module, a controller, a cabinet light control module, an exhibition hall light control module, a residual light control module, a display module, an alarm module, a power supply monitoring module, a UPS power supply, a power supply, a time synchronization module and an activity detection module. The first light intensity sensor and the second light intensity sensor enable the system to automatically turn on lights in an exhibition hall for lighting when the light intensity in the exhibition hall satisfies certain requirements. The activity detection module enables the system to turn on exhibition hall lights and cabinet lights in the exhibition hall when a light intensity difference is out of a certain range and there are activities of people in the exhibition hall.

FIELD OF THE PATENT APPLICATION

The present patent application generally relates to an exhibition hall lighting circuit and more specifically to a control system for exhibition hall lighting circuit.

BACKGROUND

Exhibition design refers to visual arts of all exhibitions and displays, including indoor and outdoor environmental planning and beautification design for commercial sales space and service space such as shopping malls, hotels, supermarkets and so on. Digital exhibition hall design focuses on 3D images so that the information is more visual and easier to understand while more information can be shown. Such digital exhibition hall design enriches ways of expressions of exhibition halls and therefore the exhibition halls can bring about profound experience. The hypermedia technology employed in the exhibition hall design has been widely applied in exhibition projects for real estate marketing, government planning, cultural activities, business achievements and so on.

However, at present, as for exhibition halls, the design of lighting systems is a key to the design of exhibition halls and an effective lighting system can better promote the exhibition of exhibition halls. However, at present, there lacks an effective exhibition hall lighting system which can not only illuminate an exhibition hall intelligently, but also guard against theft to some degree.

SUMMARY

The present patent application is directed to a control system for exhibition hall lighting circuit. In one aspect, the control system for exhibition hall lighting circuit includes a first light intensity sensor, a second light intensity sensor, a data analysis module, a controller, a cabinet light control module, an exhibition hall light control module, a residual light control module, a display module, an alarm module, a power supply monitoring module, a UPS power supply, a power supply, a time synchronization module and an activity detection module. The cabinet light control module is configured to control operation of cabinet lights in display cabinets in an exhibition hall. The exhibition hall light control module is configured to control operation of hall lights in the exhibition hall. The residual light control module is configured to control operation of lights except cabinet lights and exhibition hall lights. The first light intensity sensor is disposed in the exhibition hall and configured to acquire an information group of first light intensity information Hi produced at preset time intervals in the exhibition hall. The second light intensity sensor is disposed outside the exhibition hall and configured to detect in real time an information group of second light intensity information Ji produced at the preset time intervals outside the exhibition hall. The time synchronization module is synchronized with the Internet time. The controller is configured to acquire time information of the Internet in real time. The first light intensity sensor is configured to transmit the first light intensity information Hi to the data analysis module. The second light intensity sensor is configured to transmit the second light intensity information Ji to the data analysis module.

The data analysis module is configured to process the first light intensity information Hi and the second light intensity information Ji according to a processing method. The processing method includes the following steps:

step 1: deriving a light intensity difference X1by subtracting the first light intensity information Hi from the second light intensity information Ji;

step 2: automatically deriving multiple light intensity differences Xi (i=2 . . . n) at the preset time intervals after deriving the initial light intensity difference X1;

step 3: deriving average light intensity differences O in real time and deriving light intensity values Si in accordance with a formula

Si=1N⁢∑i=1N⁢(Xi-O)2;
step 4: deriving real-time varied values T of light intensity values Si in accordance with a formula T=|Si−Si−1|; and
step 5: determining the first light intensity information Hi when the real-time varied value T is greater than a first preset value, then determining the value of a formula Hi−Hi−1; transmitting a preparatory lighting signal to the controller when the value of the formula Hi−Hi−1is greater than 0.

The data analysis module is configured to transmit a preparatory lighting signal to the controller according to the processing method when processing conditions are met. The activity detection module is configured to detect activities of people in the exhibition hall in real time and transmit an accessory lighting signal to the controller when detecting activities of people in the exhibition hall. The controller transmits a lighting signal to the exhibition hall light control module when receiving the accessory lighting signal transmitted by the activity detection module and the preparatory lighting signal transmitted by the data analysis module. The exhibition hall light control module turns on exhibition hall lights for lighting when receiving the lighting signal transmitted by the controller.

The controller may transmit a lighting signal to the cabinet light control module when receiving an accessory lighting signal transmitted by the activity detection module and a preparatory lighting signal transmitted by the data analysis module.

The cabinet light control module may turn on cabinet lights for lighting when receiving the lighting signal transmitted by the controller.

The power supply monitoring module may be configured to monitor operation of the power supply of the exhibition hall lighting system in real time. The power supply monitoring module may be configured to switch to the UPS power supply for power supply when detecting disconnection of the power supply. The power supply monitoring module may be configured to transmit a power supply alarm signal to the controller when detecting disconnection of the power supply. The controller may transmit the power supply alarm signal to the alarm module when receiving the power supply alarm signal transmitted by the power supply monitoring module. The alarm module may raise an alarm when receiving the power supply alarm signal transmitted by the controller.

The controller may transmit the power supply alarm signal to the display module when receiving the power supply alarm signal transmitted by the power supply monitoring module. The display module may automatically display words of “disconnection of power supply” when receiving the power supply alarm signal transmitted by the controller. The data analysis module may transmit a preparatory lighting signal to the controller when receiving second light intensity information Ji which is lower than a second preset value.

The data analysis module may be further configured to transmit a range lighting signal to the controller when the light intensity difference is out of a first preset range. The controller may transmit a lighting signal to the residual light control module when receiving the range lighting signal transmitted by the data analysis module. The residual light control module may turn on lights except cabinet lights and exhibition hall lights for lighting when receiving the lighting signal transmitted by the controller.

The data analysis module may transmit a regular lighting signal to the controller when the light intensity difference is out of a second preset range. The controller may be configured to transmit a lighting signal to the exhibition hall light control module when receiving the regular lighting signal transmitted by the data analysis module in a first preset time period. The exhibition hall light control module may turn on exhibition hall lights when receiving the lighting signal transmitted by the controller.

The controller may be further configured to transmit an anti-theft signal to the alarm module when receiving an accessory lighting signal transmitted by the activity detection module in a second preset time period. The alarm module may raise an alarm when receiving the anti-theft signal transmitted by the controller.

The controller may be further configured to transmit an anti-theft signal to the display module when receiving an accessory lighting signal transmitted by the activity detection module in a third preset time period. The display module displays words of “abnormal activities” when receiving the anti-theft signal transmitted by the controller.

In another aspect, the present patent application provides a control system for exhibition hall lighting circuit. The control system for exhibition hall lighting circuit includes a first light intensity sensor disposed in the exhibition hall and configured to acquire an information group of first light intensity information Hi produced at preset time intervals in the exhibition hall, a second light intensity sensor disposed outside the exhibition hall and configured to detect in real time an information group of second light intensity information Ji produced at the preset time intervals outside the exhibition hall, a data analysis module, a controller and an exhibition hall light control module configured to control operation of hall lights in the exhibition hall.

The first light intensity sensor is configured to transmit the first light intensity information Hi to the data analysis module. The second light intensity sensor is configured to transmit the second light intensity information Ji to the data analysis module.

The data analysis module is configured to process the first light intensity information Hi and the second light intensity information Ji according to a processing method. The processing method includes the following steps:

step 1: deriving a light intensity difference X1by subtracting the first light intensity information Hi from the second light intensity information Ji;

step 2: automatically deriving multiple light intensity differences Xi (i=2 . . . n) at the preset time intervals after deriving the initial light intensity difference X1;

step 3: deriving average light intensity differences O in real time and deriving light intensity values Si in accordance with a formula

Si=1N⁢∑i=1N⁢(Xi-O)2;
step 4: deriving real-time varied values T of light intensity values Si in accordance with a formula T=|Si−Si−1|; and
step 5: determining the first light intensity information Hi when the real-time varied value T is greater than a first preset value, then determining the value of a formula Hi−Hi−1; transmitting a preparatory lighting signal to the controller when the value of the formula Hi−Hi−1is greater than 0.

The data analysis module transmits a regular lighting signal to the controller when the light intensity difference is out of a second preset range. The controller is configured to transmit a lighting signal to the exhibition hall light control module when receiving the regular lighting signal transmitted by the data analysis module in a first preset time period. The exhibition hall light control module turns on exhibition hall lights when receiving the lighting signal transmitted by the controller.

The control system for exhibition hall lighting circuit may further include a cabinet light control module configured to control operation of cabinet lights in display cabinets in the exhibition hall and an activity detection module configured to detect activities of people in the exhibition hall in real time and transmit an accessory lighting signal to the controller when detecting activities of people in the exhibition hall. The data analysis module may transmit a preparatory lighting signal to the controller when receiving second light intensity information Ji which is lower than a second preset value. The data analysis module may be configured to transmit a preparatory lighting signal to the controller according to the processing method when processing conditions are met. The controller may transmit a lighting signal to the exhibition hall light control module when receiving the accessory lighting signal transmitted by the activity detection module and the preparatory lighting signal transmitted by the data analysis module. The exhibition hall light control module may turn on exhibition hall lights for lighting when receiving the lighting signal transmitted by the controller. The controller may transmit a lighting signal to the cabinet light control module when receiving an accessory lighting signal transmitted by the activity detection module and a preparatory lighting signal transmitted by the data analysis module. The cabinet light control module may turn on cabinet lights for lighting when receiving the lighting signal transmitted by the controller.

The control system for exhibition hall lighting circuit may further include a power supply monitoring module, a UPS power supply, a power supply, a display module and an alarm module. The power supply monitoring module may be configured to monitor operation of the power supply of the exhibition hall lighting system in real time. The power supply monitoring module may be configured to switch to the UPS power supply for power supply when detecting disconnection of the power supply. The power supply monitoring module may be configured to transmit a power supply alarm signal to the controller when detecting disconnection of the power supply. The controller may transmit the power supply alarm signal to the alarm module when receiving the power supply alarm signal transmitted by the power supply monitoring module. The alarm module may raise an alarm when receiving the power supply alarm signal transmitted by the controller. The controller may transmit the power supply alarm signal to the display module when receiving the power supply alarm signal transmitted by the power supply monitoring module. The display module may automatically display words of “disconnection of power supply” when receiving the power supply alarm signal transmitted by the controller.

The control system for exhibition hall lighting circuit may further include a residual light control module configured to control operation of lights except cabinet lights and exhibition hall lights. The data analysis module may be further configured to transmit a range lighting signal to the controller when the light intensity difference is out of a first preset range. The controller may transmit a lighting signal to the residual light control module when receiving the range lighting signal transmitted by the data analysis module. The residual light control module may turn on lights except cabinet lights and exhibition hall lights for lighting when receiving the lighting signal transmitted by the controller.

The control system for exhibition hall lighting circuit may further include a time synchronization module. The time synchronization module may be synchronized with the Internet time. The controller may be configured to acquire time information of the Internet in real time.

The controller may be further configured to transmit an anti-theft signal to the alarm module when receiving an accessory lighting signal transmitted by the activity detection module in a second preset time period. The alarm module may raise an alarm when receiving the anti-theft signal transmitted by the controller. The controller may be further configured to transmit an anti-theft signal to the display module when receiving an accessory lighting signal transmitted by the activity detection module in a third preset time period. The display module may display words of “abnormal activities” when receiving the anti-theft signal transmitted by the controller.

In yet another aspect, the present patent application provides a control system for exhibition hall lighting circuit. The control system for exhibition hall lighting circuit includes a first light intensity sensor disposed in the exhibition hall and configured to acquire an information group of first light intensity information Hi produced at preset time intervals in the exhibition hall, a second light intensity sensor disposed outside the exhibition hall and configured to detect in real time an information group of second light intensity information Ji produced at the preset time intervals outside the exhibition hall, a data analysis module, a controller, a cabinet light control module configured to control operation of cabinet lights in display cabinets in the exhibition hall, an exhibition hall light control module configured to control operation of hall lights in the exhibition hall and an activity detection module configured to detect activities of people in the exhibition hall in real time and transmit an accessory lighting signal to the controller when detecting activities of people in the exhibition hall. The first light intensity sensor is configured to transmit the first light intensity information Hi to the data analysis module. The second light intensity sensor is configured to transmit the second light intensity information Ji to the data analysis module.

The data analysis module is configured to process the first light intensity information Hi and the second light intensity information Ji according to a processing method. The processing method includes the following steps:

step 1: deriving a light intensity difference X1by subtracting the first light intensity information Hi from the second light intensity information Ji;

step 2: automatically deriving multiple light intensity differences Xi (i=2 . . . n) at the preset time intervals after deriving the initial light intensity difference X1;

step 3: deriving average light intensity differences O in real time and deriving light intensity values Si in accordance with a formula

Si=1N⁢∑i=1N⁢(Xi-O)2;
step 4: deriving real-time varied values T of light intensity values Si in accordance with a formula T=|Si−Si−1|; and
step 5: determining the first light intensity information Hi when the real-time varied value T is greater than a first preset value, then determining the value of a formula Hi−Hi−1; transmitting a preparatory lighting signal to the controller when the value of the formula Hi−Hi−1is greater than 0.

The data analysis module is configured to transmit a preparatory lighting signal to the controller according to the processing method when processing conditions are met. The controller transmits a lighting signal to the exhibition hall light control module when receiving the accessory lighting signal transmitted by the activity detection module and the preparatory lighting signal transmitted by the data analysis module. The exhibition hall light control module turns on exhibition hall lights for lighting when receiving the lighting signal transmitted by the controller. The controller transmits a lighting signal to the cabinet light control module when receiving an accessory lighting signal transmitted by the activity detection module and a preparatory lighting signal transmitted by the data analysis module. The cabinet light control module turns on cabinet lights for lighting when receiving the lighting signal transmitted by the controller.

The control system for exhibition hall lighting circuit may further include a residual light control module configured to control operation of lights except cabinet lights and exhibition hall lights. The data analysis module may transmit a preparatory lighting signal to the controller when receiving second light intensity information Ji which is lower than a second preset value. The data analysis module may be further configured to transmit a range lighting signal to the controller when the light intensity difference is out of a first preset range. The controller may transmit a lighting signal to the residual light control module when receiving the range lighting signal transmitted by the data analysis module. The residual light control module may turn on lights except cabinet lights and exhibition hall lights for lighting when receiving the lighting signal transmitted by the controller. The data analysis module may transmit a regular lighting signal to the controller when the light intensity difference is out of a second preset range. The controller may be configured to transmit a lighting signal to the exhibition hall light control module when receiving the regular lighting signal transmitted by the data analysis module in a first preset time period. The exhibition hall light control module may turn on exhibition hall lights when receiving the lighting signal transmitted by the controller.

The control system for exhibition hall lighting circuit may further include a power supply monitoring module, a UPS power supply, a power supply, a display module and an alarm module. The power supply monitoring module may be configured to monitor operation of the power supply of the exhibition hall lighting system in real time. The power supply monitoring module may be configured to switch to the UPS power supply for power supply when detecting disconnection of the power supply. The power supply monitoring module may be configured to transmit a power supply alarm signal to the controller when detecting disconnection of the power supply. The controller may transmit the power supply alarm signal to the alarm module when receiving the power supply alarm signal transmitted by the power supply monitoring module. The alarm module may raise an alarm when receiving the power supply alarm signal transmitted by the controller. The controller may transmit the power supply alarm signal to the display module when receiving the power supply alarm signal transmitted by the power supply monitoring module. The display module may automatically display words of “disconnection of power supply” when receiving the power supply alarm signal transmitted by the controller.

The control system for exhibition hall lighting circuit may further include a time synchronization module. The time synchronization module may be synchronized with the Internet time. The controller may be configured to acquire time information of the Internet in real time.

The controller may be further configured to transmit an anti-theft signal to the alarm module when receiving an accessory lighting signal transmitted by the activity detection module in a second preset time period. The alarm module may raise an alarm when receiving the anti-theft signal transmitted by the controller. The controller may be further configured to transmit an anti-theft signal to the display module when receiving an accessory lighting signal transmitted by the activity detection module in a third preset time period. The display module may display words of “abnormal activities” when receiving the anti-theft signal transmitted by the controller.

DETAILED DESCRIPTION

Reference will now be made in detail to a preferred embodiment of the control system for exhibition hall lighting circuit disclosed in the present patent application, examples of which are also provided in the following description. Exemplary embodiments of the control system for exhibition hall lighting circuit disclosed in the present patent application are described in detail, although it will be apparent to those skilled in the relevant art that some features that are not particularly important to an understanding of the control system for exhibition hall lighting circuit may not be shown for the sake of clarity.

Furthermore, it should be understood that the control system for exhibition hall lighting circuit disclosed in the present patent application is not limited to the precise embodiments described below and that various changes and modifications thereof may be effected by one skilled in the art without departing from the spirit or scope of the protection. For example, elements and/or features of different illustrative embodiments may be combined with each other and/or substituted for each other within the scope of this disclosure.

Referring toFIG. 1toFIG. 3, a control system for exhibition hall lighting circuit includes a first light intensity sensor1, a second light intensity sensor2, a data analysis module3, a controller4, a cabinet light control module5, an exhibition hall light control module6, a residual light control module7, a display module8, an alarm module9, a power supply monitoring module10, a UPS power supply11, a power supply12, a time synchronization module13and an activity detection module14.

The cabinet light control module5is configured to control the operation of cabinet lights in display cabinets in an exhibition hall. The exhibition hall light control module6is configured to control the operation of hall lights in the exhibition hall (excluding cabinet lights and residual lights). The residual light control module7is configured to control the operation of lights except cabinet lights and exhibition hall lights. The first light intensity sensor1is disposed in the exhibition hall and configured to acquire an information group of first light intensity information Hi produced at preset time intervals (e.g. one to five minutes) in the exhibition hall. The second light intensity sensor2is disposed outside the exhibition hall and configured to detect in real time an information group of second light intensity information Ji produced at the preset time intervals (e.g. one to five minutes) outside the exhibition hall. The time synchronization module13is synchronized with the Internet time. The controller4is configured to acquire time information of the Internet in real time.

The first light intensity sensor1is configured to transmit the first light intensity information Hi to the data analysis module3. The second light intensity sensor2is configured to transmit the second light intensity information Ji to the data analysis module3. The data analysis module3is configured to process the first light intensity information Hi and the second light intensity information Ji according to the processing method described hereafter. Referring toFIG. 2, the processing method includes the following steps:

Step201: deriving a light intensity difference X1by subtracting the first light intensity information Hi from the second light intensity information Ji;

Step202: automatically deriving multiple light intensity differences Xi (i=2 . . . n) at the preset time intervals (e.g. one to five minutes) after deriving the initial light intensity difference X1;

Step203: deriving average light intensity differences O in real time and deriving light intensity values Si in accordance with a formula

Si=1N⁢∑i=1N⁢(Xi-O)2;
Step204: deriving real-time varied values T of light intensity values Si in accordance with a formula T=|Si−Si−1|;
Step205: determining the first light intensity information Hi when the real-time varied value T is greater than a first preset value (e.g. 0.1-1.5 lux), then determining the value of a formula Hi−Hi−1; transmitting a preparatory lighting signal to the controller4when the value of the formula Hi−Hi−1is greater than 0.

It is noted that the first light intensity information Hi and the second light intensity information Ji are not limited to the values listed above. The first preset value can be (Tmax+Tmin)/2.

The data analysis module3is configured to transmit a preparatory lighting signal to the controller4according to the processing method described above when processing conditions are met. The activity detection module14is configured to detect the activities of people in the exhibition hall in real time. The activity detection module14transmits an accessory lighting signal to the controller4when detecting activities of people in the exhibition hall. The controller4transmits a lighting signal to the exhibition hall light control module6when receiving the accessory lighting signal transmitted by the activity detection module14and the preparatory lighting signal transmitted by the data analysis module3. The exhibition hall light control module6turns on exhibition hall lights for lighting when receiving the lighting signal transmitted by the controller4.

In addition, the controller4transmits a lighting signal to the cabinet light control module5when receiving an accessory lighting signal transmitted by the activity detection module14and a preparatory lighting signal transmitted by the data analysis module3. The cabinet light control module5turns on cabinet lights for lighting when receiving the lighting signal transmitted by the controller4.

Further, the power supply monitoring module10is configured to monitor the operation of the power supply12of the exhibition hall lighting system in real time. The power supply monitoring module10is configured to switch to the UPS power supply11for power supply when detecting the disconnection of the power supply12.

The power supply monitoring module10is configured to transmit a power supply alarm signal to the controller4when detecting disconnection of the power supply12. The controller4transmits the power supply alarm signal to the alarm module9when receiving the power supply alarm signal transmitted by the power supply monitoring module10. The alarm module9raises an alarm when receiving the power supply alarm signal transmitted by the controller4.

Furthermore, the controller4transmits the power supply alarm signal to the display module8when receiving the power supply alarm signal transmitted by the power supply monitoring module10. The display module8automatically displays words of “disconnection of power supply” when receiving the power supply alarm signal transmitted by the controller4.

The data analysis module3transmits a preparatory lighting signal to the controller4when receiving the second light intensity information Ji which is lower than a second preset value. For example, the second preset value can be 50-60 lux.

The data analysis module3is further configured to transmit a range lighting signal to the controller4when the light intensity difference is out of a first preset range (e.g. 90-110 lux). The controller4transmits a lighting signal to the residual light control module7when receiving the range lighting signal transmitted by the data analysis module3. The residual light control module7turns on lights except cabinet lights and exhibition hall lights for lighting when receiving the lighting signal transmitted by the controller4.

The data analysis module3transmits a regular lighting signal to the controller4when the light intensity difference is out of a second preset range (e.g. 110-150 lux). The controller4is configured to transmit a lighting signal to the exhibition hall light control module6when receiving the regular lighting signal transmitted by the data analysis module3in a first preset time period (e.g. 8:30-20:00). The exhibition hall light control module6turns on exhibition hall lights when receiving the lighting signal transmitted by the controller4.

The controller4is further configured to transmit an anti-theft signal to the alarm module9when receiving an accessory lighting signal transmitted by the activity detection module14in a second preset time period (e.g. 20:30-8:00). The alarm module9raises an alarm when receiving the anti-theft signal transmitted by the controller4.

The controller4is further configured to transmit an anti-theft signal to the display module8when receiving an accessory lighting signal transmitted by the activity detection module14in a third preset time period (e.g. 20:30-8:00). The display module8displays words of “abnormal activities” when receiving the anti-theft signal transmitted by the controller4.

In one embodiment, when the first light intensity sensor1and the second light intensity sensor2transmit first light intensity information Hi and second light intensity information Ji to the data analysis module3, the data analysis module3automatically derives light intensity differences and transmits a preparatory lighting signal to the controller4when a light intensity difference is out of a preset range.

At the same time, when the activity detection module14detects activities of people in the exhibition hall, the activity detection module14transmits an accessory lighting signal to the controller4. The controller4transmits a lighting signal to the exhibition hall light control module6when receiving the accessory lighting signal transmitted by the activity detection module14and the preparatory lighting signal transmitted by the data analysis module3. At this time, the exhibition hall light control module6turns on exhibition hall lights for lighting when receiving the lighting signal transmitted by the controller4and the cabinet light control module5drives and controls cabinet lights in exhibition cabinets to be turned on.

In another embodiment, the first light intensity sensor1and the second light intensity sensor2transmit first light intensity information Hi and second light intensity information Ji to the data analysis module3. The data analysis module3is configured to transmit a range lighting signal to the controller4when a light intensity difference is out of a first preset range. The controller4transmits a lighting signal to the residual light control module7when receiving the range lighting signal transmitted by the data analysis module3. The residual light control module7drives and controls lights except cabinet lights and exhibition hall lights to be turned on for lighting when receiving the lighting signal transmitted by the controller4, as so to maintain the lighting of hallways in the exhibition hall.

In yet another embodiment, the controller4is further configured to transmit an anti-theft signal to the alarm module9when receiving an accessory lighting signal transmitted by the activity detection module14in a second preset time period. In the second preset time period, there are few activities of people. The alarm module9raises an alarm when receiving the anti-theft signal transmitted by the controller4.

At the same time, the controller4transmits an anti-theft signal to the display module8when receiving an accessory lighting signal transmitted by the activity detection module14in a third preset time period. The display module8displays words of “abnormal activities” on the screen when receiving the anti-theft signal transmitted by the controller4so as to remind the working staff.

The design of a first light intensity sensor1and a second light intensity sensor2in a control system for exhibition hall lighting circuit enables the system to automatically turn on lights in an exhibition hall for lighting when the light intensity in the exhibition hall satisfies certain requirements. The configuration of a data analysis module3enables the system to detect the light intensity information in the exhibition hall effectively. The configuration of an activity detection module14enables the system to turn on exhibition hall lights and cabinet lights in the exhibition hall when the light intensity difference is out of a certain range and there are activities of people in the exhibition hall. When it is in a second preset time period and a controller4detects that exhibition hall lights need to be turned on, an alarm module9raises an alarm automatically. The present patent application is simple, effective and easy to use.

While the present patent application has been shown and described with particular references to a number of embodiments thereof, it should be noted that various other changes or modifications may be made without departing from the scope of the present invention.