CN111640225A - Control system and control method for automatic counting in classroom - Google Patents
Control system and control method for automatic counting in classroom Download PDFInfo
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- CN111640225A CN111640225A CN202010508460.0A CN202010508460A CN111640225A CN 111640225 A CN111640225 A CN 111640225A CN 202010508460 A CN202010508460 A CN 202010508460A CN 111640225 A CN111640225 A CN 111640225A
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- H—ELECTRICITY
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Abstract
The invention discloses a control system and a control method for automatic counting in a classroom, wherein the control system comprises a first pressure sensor, a second pressure sensor, a first floor, a second floor, a first laser emitter, a first laser receiver, a slave single chip microcomputer, a third pressure sensor, a fourth pressure sensor, a third floor, a fourth floor, a second laser emitter, a second laser receiver, a master single chip microcomputer, an LED display screen and an automatic light switching device, wherein the first pressure sensor, the second pressure sensor, the first floor, the second floor, the first laser emitter, the first laser receiver and the slave single chip microcomputer are positioned at a back door; the invention can automatically count and display the number of people entering and exiting the classroom, upload the number of people in the classroom and the number of idle seats to a school data center, and automatically turn off the illuminating lamp in the classroom after a period of time when the absence of the classroom is judged.
Description
Technical Field
The invention belongs to the technical field of intelligent classrooms, and particularly relates to a control system and a control method for automatic counting in a classroom.
Background
At present, a large number of public classrooms exist in colleges and universities for teaching or student self-study, during teaching, if teachers want to count the number of attendance, the currently and generally adopted method is roll call one by one, the method is troublesome and labor-consuming, the situation of answering with students exists, and at present, if a teacher wants to know the actual attendance rate in class, only professional staff are arranged to go to the class for checking. There are also colleges and universities who adopt the attendance machine to count the number of people on duty, but considering college classroom quantity, the installation attendance machine and later maintenance will be a great expenditure. When no teaching task exists, a classroom is generally used as a study room for students to study, and if the number of people in the classroom can be viewed before the mobile phone app is provided, the students can find out a proper study room more quickly. And the situation that the lamps are still lighted in an unmanned situation in the current classroom generally exists, so that a large amount of energy is wasted.
At present, sensor technology, single chip microcomputer technology and wireless communication technology develop rapidly, and the cost is in a trend of declining year by year. Therefore, if the sensor and the single chip microcomputer technology are utilized to realize the real-time statistics of the number of the classroom people, the efficiency of teachers and students can be greatly improved, and the development of intelligent schools is accelerated. However, the existing intelligent classroom still has the following defects:
firstly, the real-time counting of the number of people is easy to cause errors;
secondly, the sensor is insensitive and the statistics are not comprehensive;
thirdly, the system can only be used for counting the number of people, cannot achieve good green environmental protection and waste reduction on classroom maintenance and resource protection, and also can increase the workload of managers;
fourthly, the campus terminal cannot achieve good real-time synchronization, and the attendance rate is not facilitated to be promoted.
Therefore, it is now urgently needed to design a control system that not only can the automatic counting, and the count is synchronous, accurate to whether timely throttle is judged to intelligence, turn off the interior light of classroom and utilize wireless communication technique to upload the classroom number to the campus terminal when the classroom nobody, then can help mr and educational administration department to count the rate of attendance during teaching, and can realize in time turning off the light when nobody, save a large amount of electric power energy.
Disclosure of Invention
In view of the above, to solve the above-mentioned deficiencies of the prior art, an object of the present invention is to provide a control system and a control method thereof for automatic counting in a classroom, which can automatically count and display the number of people entering and exiting the classroom, upload the number of people in the classroom and the number of idle seats to a school data center, and automatically turn off the lighting lamps in the classroom after a time delay when it is determined that there is no room in the classroom.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a control system for automatic counting in a classroom comprises a first pressure sensor, a second pressure sensor, a first floor, a second floor, a first laser emitter, a first laser receiver and a slave single chip microcomputer which are positioned at a rear door, a third pressure sensor, a fourth pressure sensor, a third floor, a fourth floor, a second laser emitter, a second laser receiver and a master single chip microcomputer which are positioned at a front door, an LED display screen and an automatic light switching device; the slave single chip microcomputer, the LED display screen and the automatic lamp switching device are all connected with the master single chip microcomputer;
the first floor is arranged on the inner side of the first door frame of the rear door, the second floor is arranged on the outer side of the first door frame of the rear door, the first pressure sensor is positioned below the first floor and connected with the first floor, the second pressure sensor is positioned below the second floor and connected with the second floor, and the first laser transmitter and the first laser receiver are oppositely arranged on the first door frame of the rear door and are positioned at the same height;
the third floor is arranged on the inner side of the second door frame of the front door, the fourth floor is arranged on the outer side of the second door frame of the front door, the third pressure sensor is positioned below the third floor and connected with the third floor, the fourth pressure sensor is positioned below the fourth floor and connected with the fourth floor, and the second laser transmitter and the second laser receiver are oppositely arranged on the second door frame of the front door and are positioned at the same height.
Furthermore, the main singlechip is respectively connected with the led display screen and the Ethernet module.
Furthermore, the master singlechip and the slave singlechip are respectively connected with a Bluetooth module.
Furthermore, the slave single chip microcomputer is respectively connected with the first pressure sensor, the second pressure sensor and the first laser receiver through signal connecting lines.
Furthermore, the main single chip microcomputer is respectively connected with a third pressure sensor, a fourth pressure sensor and a second laser receiver through signal connecting lines.
Furthermore, the LED display screen and the automatic lamp switching device are arranged on one side of the main single chip microcomputer.
Further, the automatic light switching device is a circuit breaker.
Further, a control method of a control system for automatic counting in a classroom comprises the following steps:
s1: the first pressure sensor and the second pressure sensor respectively detect the pressure changes on the first floor and the second floor inside and outside the classroom door, and then judge whether a person enters or exits; when the signal intensity generated by the pressure sensor does not exceed a preset threshold value, the slave single chip microcomputer judges that the signal generated by the pressure sensor is other objects and does not count;
s2: whether a person enters a classroom is judged according to the signal generation sequence of the first pressure sensor and the second pressure sensor: counting if only the first pressure sensor or the second sensor generates signals; if the first pressure sensor generates a signal firstly and the second pressure sensor generates a signal later, the person is judged to enter a classroom; if the second pressure sensor generates a signal first and the first pressure sensor generates a signal later, the person is judged to leave the classroom;
s3: the slave single chip microcomputer judges the personnel entering the classroom again according to the signal of the first laser receiver, and the verification step S2 is carried out;
s4: the first laser emitter and the first laser receiver on the first door frame count, the data of people entering and leaving the door is calculated from the single chip microcomputer, and then the number of people entering the classroom and remaining in the classroom is obtained;
s41: the slave single chip microcomputer judges whether people enter or exit the classroom according to signals of the first pressure sensor, the second pressure sensor and the first laser receiver: if the person enters the classroom, the number of the persons left in the classroom by the counting unit is increased by one; if the person leaves the classroom, the number of the persons left in the classroom by the counting unit is reduced by one;
s5: the slave single chip microcomputer uploads the number of people entering and exiting the door to the master single chip microcomputer through the Bluetooth module at regular intervals, the master single chip microcomputer obtains the number of people in the classroom according to the received number of people entering and exiting each door, and then the master single chip microcomputer controls the LED display screen to display the number of people in the classroom;
s6: the main single chip microcomputer obtains the number of seats left in the classroom according to the total number of seats in the classroom and the calculated number of people in the classroom, the main single chip microcomputer uploads the number of people in the classroom and the number of seats left to a school data center through an Ethernet module at regular intervals, and students inquire the number of seats left in the classroom at an APP terminal;
s7: if the number of people in the current classroom is 0 as calculated by the main single-chip microcomputer, the main single-chip microcomputer performs countdown by utilizing a self-contained timer, and when the preset countdown time is 0, the automatic light switching device is controlled to switch off the illuminating lamp in the classroom.
The invention has the beneficial effects that:
the control system and the control method for automatic counting in the classroom can automatically count and display the number of people entering and exiting the classroom, upload the number of people in the classroom and the number of idle seats to a school data center, and automatically turn off the illuminating lamp in the classroom after a period of time when the situation that no people exist in the classroom is judged. The concrete advantages are as follows:
1. the control system further realizes uploading of the number of the indoor people to a school data center on the basis of accurate statistics of the number of the classroom people, so that students can inquire the number of the classroom people in real time in APP and give class to teachers, and the illuminating lamp in the classroom is automatically turned off after a period of time when the number of the classroom people is zero;
2. the control method of the invention utilizes the sensor technology to judge whether people or other moving objects enter or exit the classroom and detect and distinguish the number of people entering or exiting the classroom; transmitting statistical data on different doors of a single classroom to a main singlechip by using a Bluetooth communication technology; the single-chip microcomputer technology is utilized to carry out statistical calculation on the data of a single classroom to obtain the actual number of people in the classroom and the number of idle seats; displaying the real-time number of people in the classroom on a display screen of a classroom platform by using an led display technology so as to enable a lessee to inquire the number of people who attendance; uploading the total number of people in the classroom to a school data terminal by utilizing an Ethernet communication technology so that students can inquire the number of people in the classroom in the APP; by utilizing the timer function of the single chip microcomputer, when the number of people in a classroom is judged to be 0, the classroom illuminating lamp is turned off after a period of time delay; the function has solved the current difficulty of giving up of giving lessons teacher's statistics of rate of attendance, has solved the classroom and has still been in the extravagant scheduling problem of energy that the state led to the fact of always brightening when nobody.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a top view of a classroom of the present invention;
FIG. 2 is a front view of a classroom embodying the present invention;
the labels in the figure are: 1. the system comprises a slave single chip microcomputer, a second floor, a first pressure sensor, a second floor, a second pressure sensor, a third pressure sensor, a second pressure sensor, a third floor, a fourth floor, a second pressure sensor, a signal connecting line, a main single chip microcomputer, a second pressure sensor, a third pressure sensor, a signal connecting line, a main single chip microcomputer, a master switch light device, a master display screen, a master door frame, a master laser emitter, a master laser receiver, a master door frame, a.
Detailed Description
The following specific examples are given to further clarify, complete and detailed the technical solution of the present invention. The present embodiment is a preferred embodiment based on the technical solution of the present invention, but the scope of the present invention is not limited to the following embodiments.
Further, this embodiment of the present invention is specifically illustrated with a single classroom having two entrances, namely a front door and a rear door. The multiple inlet solution is the same as this embodiment and is within the scope of the present invention.
A control system for automatic counting in a classroom comprises a first pressure sensor 3, a second pressure sensor 5, a first floor 2, a second floor 4, a first laser emitter 13, a first laser receiver 16, a slave singlechip 1, a third pressure sensor 6, a fourth pressure sensor 9, a third floor 7, a fourth floor 8, a second laser emitter 18, a second laser receiver 19, a master singlechip 11, an LED display screen 13 and an automatic light switching device 12, wherein the first pressure sensor 3, the second pressure sensor 5, the first floor 2, the second floor 4, the first laser emitter 13, the first laser receiver 16, the slave singlechip 1 are positioned at a front door; the slave single chip microcomputer 1, the LED display screen 13 and the automatic lamp switching device 12 are all connected with the master single chip microcomputer 11;
the first floor 2 is arranged on the inner side of a first door frame 14 of the rear door, the second floor 4 is arranged on the outer side of the first door frame 14 of the rear door, the first pressure sensor 3 is positioned below the first floor 2 and connected with the first floor 2, the second pressure sensor 5 is positioned below the second floor 4 and connected with the second floor 4, the first laser transmitter 15 and the first laser receiver 16 are oppositely arranged on the first door frame 14 of the rear door and are positioned at the same height;
the third floor 7 is arranged on the inner side of a second door frame 17 of the front door, the fourth floor 8 is arranged on the outer side of the second door frame 17 of the front door, the third pressure sensor 6 is positioned below the third floor 7 and connected with the third floor 7, the fourth pressure sensor 9 is positioned below the fourth floor 8 and connected with the fourth floor 8, and the second laser transmitter 18 and the second laser receiver 19 are oppositely arranged on the second door frame 17 of the front door and are at the same height.
Further, the first floor 2, the second floor 4, the third floor 7 and the fourth floor 8 are all movable floors.
Further, the slave single chip microcomputer 1 is respectively connected with the first pressure sensor 3, the second pressure sensor 5 and the first laser receiver 16 through signal connecting lines 10.
Further, the main single chip microcomputer 11 is respectively connected with the third pressure sensor 6, the fourth pressure sensor 9 and the second laser receiver 19 through signal connection lines 10.
Further, the led display screen 13 and the automatic lamp switching device 12 are both arranged on one side of the main single chip microcomputer 11.
Further, the main singlechip 11 is connected with the led display screen 13 and the ethernet module respectively. The main singlechip 11 directly controls the led display screen 13, and can display the number of people in the classroom on the led display screen 13, and the main singlechip 11 can send the number of people in the classroom and the number of people remaining in the classroom to the school data center through the ethernet module.
Furthermore, the master singlechip 11 and the slave singlechip 1 are respectively connected with a bluetooth module. The Bluetooth module is used for receiving data of the slave single chip microcomputer, and the master single chip microcomputer is respectively connected with the pressure sensor and the laser receiver through the Bluetooth module and the signal connecting line 10 and can control the automatic light turning-off device.
Further, the automatic light switching device 12 is a circuit breaker. The main singlechip 11 can control the automatic lamp switching device 12 to turn off the indoor illumination lamp.
Further, a control method of a control system for automatic counting in a classroom comprises the following steps:
s1: the first pressure sensor 3 and the second pressure sensor 5 respectively detect the pressure changes on the first floor 2 and the second floor 4 inside and outside the classroom door, and then judge whether a person enters or exits; when the signal intensity generated by the pressure sensor does not exceed the preset threshold value, the slave single chip microcomputer 1 judges that the signal generated by the pressure sensor is other objects and does not count; furthermore, the first floor 2 is positioned outside a classroom door, the second floor 4 is positioned inside the classroom door, and the area and the installation position of the two floors ensure that all people who normally do not enter the classroom need to contact the surface of the floor, so that a pressure sensor below the floor generates signals; the single chip microcomputer 1 judges whether the person enters the classroom or leaves the classroom according to different signal generation sequences of the first pressure sensor 3 and the second pressure sensor 5; if only one pressure sensor generates a signal or the signal generated by the pressure sensor is too small and does not exceed a preset threshold value, the single chip microcomputer does not process the signal;
further, in this embodiment, when a person enters from the back door, the person firstly steps on the first floor 2, so that the signal of the first pressure sensor 3 changes, and then the person moves forward, so as to block the first laser receiver 16 from receiving the signal, so that the signal of the first laser receiver 16 changes. When a person crosses the first door frame 14 of the back door, the person can step on the second floor 4, so that the signal of the second pressure sensor 9 is changed, the signal is received from the single chip microcomputer 1, the person is judged to enter by the sequence of the signal changes of the two pressure sensors and the signal of the first laser receiver, the counting value of the single chip microcomputer 1 is increased by one, if the signal of the first laser receiver is not changed, the person is judged to enter by other objects, and the single chip microcomputer does not count;
s2: whether a person enters a classroom is judged by the signal generation sequence of the first pressure sensor 3 and the second pressure sensor 5: counting if only the first pressure sensor 3 or the second sensor 5 generates a signal; if the first pressure sensor 3 generates a signal first and the second pressure sensor 5 generates a signal later, the person is judged to enter the classroom; if the second pressure sensor 5 generates a signal first and the first pressure sensor 3 generates a signal later, the person is judged to leave the classroom;
s3: the slave single chip microcomputer 1 judges the persons entering the classroom again according to the signal of the first laser receiver 16, and the step S2 is verified;
s4: the first laser emitter 15 and the first laser receiver 16 on the first door frame 14 count, and the data of people entering and leaving the door is calculated from the single chip microcomputer 1, so that the number of people entering the classroom and remaining in the classroom is obtained; further, the first laser transmitter 15 and the first laser receiver 16 are both installed at a certain height of the first door frame 14, so as to ensure that each person entering and exiting the classroom will generate a signal; the single chip microcomputer 1 judges whether one person enters or two persons continuously enter according to the duration of the signal generated by the first laser receiver 16;
s41: the slave single chip microcomputer 1 judges whether people enter or exit the classroom according to signals of the first pressure sensor 3, the second pressure sensor 5 and the first laser receiver 16: if the person enters the classroom, the number of the persons left in the classroom by the counting unit is increased by one; if the person leaves the classroom, the number of the persons left in the classroom by the counting unit is reduced by one; further, when the person leaves the classroom through the back door, the signal change sequence of the first pressure sensor 3 and the second pressure sensor 5 is opposite to that when the person enters the classroom, and the counting value of the single chip microcomputer 1 is reduced by one; when a person enters from the front door, the sensor of the front door and the main singlechip carry out the same calculation as the above;
s5: the slave single chip microcomputer 1 uploads the number of people entering and exiting the door to the master single chip microcomputer 11 through the Bluetooth module at regular intervals, the master single chip microcomputer 11 obtains the number of people in the classroom according to the received number of people entering and exiting each door, and then the LED display screen 13 is controlled to display the number of people in the classroom;
s6: the main single chip microcomputer 11 obtains the number of seats left in the classroom according to the total number of seats in the classroom and the calculated number of people in the classroom, the main single chip microcomputer 11 uploads the number of people in the classroom and the number of seats left to a school data center through an Ethernet module at regular intervals, and students inquire the number of seats left in the classroom at an APP terminal; furthermore, each entrance is provided with a single chip microcomputer for processing the number of people entering and exiting the entrance, the single chip microcomputer of one entrance is used as a master single chip microcomputer, and the other entrances are used as slave single chip microcomputers; the master single chip microcomputer and the slave single chip microcomputers are both provided with Bluetooth modules, the number of people passing in and out obtained by processing is sent to the master single chip microcomputer through the Bluetooth modules, the master single chip microcomputer obtains the number of people in the classroom in real time according to the number of people passing in and out of each inlet sent by the slave single chip microcomputer, and the set number of seats in the classroom and the number of people in the classroom in real time obtain the number of the rest seats in the classroom;
s7: if the number of people in the current classroom calculated by the main singlechip 11 is 0, the main singlechip 11 counts down by using a self-contained timer, and when the preset countdown time is 0, namely after delaying for a period of time, the automatic light switching device 12 is controlled to switch off the illuminating lamp in the classroom. The function of automatically turning off the light is realized.
Further, when a person enters from the front door, the front door sensor and the main chip microcomputer perform the same calculation as described above, and the third pressure sensor 6 and the fourth pressure sensor 9 of the front door, which are the doors close to the main chip microcomputer 11, also sequentially move downward in the same manner as described above. Furthermore, each classroom only has one master singlechip 11, and the function of the master singlechip can be assumed by a slave singlechip of one entrance. When the main singlechip 11 receives the numerical value sent from the singlechip 1, the numerical value is added with the numerical value calculated by the main singlechip 11 to obtain the real-time number of people in the classroom, then the LED display screen 13 is controlled to update the number of people in the classroom, and the number of people in the classroom is uploaded to a school data center through the Ethernet module.
Furthermore, in the invention, in the specific implementation, the number of the entrance doors of the classroom can be multiple, and each door is provided with the slave single chip microcomputer 1, a floor, a pressure sensor, a laser emitter and a laser receiver which are matched with the slave single chip microcomputer; the number of the slave single-chip microcomputers 1 is multiple, and the specific number is determined according to actual conditions and is within the protection scope of the invention; therefore, the respective slave singlechips 1 on each door frame are connected with the master singlechip 11, and the work flow of the slave singlechips operates according to the same steps.
In summary, the control system and the control method for automatic counting in a classroom of the invention are based on sensor technology, single chip technology and wireless communication technology, and the invention provides an intelligent classroom system, which utilizes a pressure sensor and a laser receiver to detect the situation of people entering and leaving; the personnel entering and exiting conditions of each door are calculated by utilizing the single chip technology; summarizing the in-out conditions of each inlet by using a Bluetooth communication technology; uploading the number of the personnel in the classroom by utilizing the Ethernet technology; displaying the number of the indoor people on a display screen by using an LED display screen; the timer carried by the singlechip is utilized to realize closing after a period of time when the number of people in the classroom is 0.
The principal features, principles and advantages of the invention have been shown and described above. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to explain the principles of the invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the invention as expressed in the following claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. A control system for automatic counting in a classroom is characterized in that: the automatic light-emitting device comprises a first pressure sensor (3), a second pressure sensor (5), a first floor (2), a second floor (4), a first laser transmitter (13), a first laser receiver (16), a slave single chip microcomputer (1), a third pressure sensor (6), a fourth pressure sensor (9), a third floor (7), a fourth floor (8), a second laser transmitter (18), a second laser receiver (19), a master single chip microcomputer (11), an LED display screen (13) and an automatic light switching device (12), wherein the first pressure sensor (3), the second pressure sensor (5), the first floor (2), the second floor (4), the first laser transmitter (13), the first laser receiver (16) and the slave single chip microcomputer; the slave single chip microcomputer (1), the LED display screen (13) and the automatic lamp switching device (12) are connected with the master single chip microcomputer (11);
the first floor (2) is arranged on the inner side of a first door frame (14) of the rear door, the second floor (4) is arranged on the outer side of the first door frame (14) of the rear door, the first pressure sensor (3) is positioned below the first floor (2) and connected with the first floor (2), the second pressure sensor (5) is positioned below the second floor (4) and connected with the second floor (4), the first laser transmitter (15) and the first laser receiver (16) are oppositely arranged on the first door frame (14) of the rear door and are at the same height;
the third floor (7) is arranged on the inner side of a second door frame (17) of the front door, the fourth floor (8) is arranged on the outer side of the second door frame (17) of the front door, the third pressure sensor (6) is positioned below the third floor (7) and connected with the third floor (7), the fourth pressure sensor (9) is positioned below the fourth floor (8) and connected with the fourth floor (8), the second laser transmitter (18) and the second laser receiver (19) are arranged on the second door frame (17) of the front door relatively, and the second laser transmitter and the second laser receiver are positioned at the same height.
2. The system as claimed in claim 1, wherein the control system for automatic counting in classroom is characterized in that: and the main singlechip (11) is respectively connected with the LED display screen (13) and the Ethernet module.
3. The system as claimed in claim 1, wherein the control system for automatic counting in classroom is characterized in that: the master single chip microcomputer (11) and the slave single chip microcomputer (1) are respectively connected with a Bluetooth module.
4. The system as claimed in claim 1, wherein the control system for automatic counting in classroom is characterized in that: the slave single chip microcomputer (1) is respectively connected with the first pressure sensor (3), the second pressure sensor (5) and the first laser receiver (16) through signal connecting lines (10).
5. The system as claimed in claim 1, wherein the control system for automatic counting in classroom is characterized in that: and the main single chip microcomputer (11) is respectively connected with the third pressure sensor (6), the fourth pressure sensor (9) and the second laser receiver (19) through signal connecting lines (10).
6. The system as claimed in claim 1, wherein the control system for automatic counting in classroom is characterized in that: and the LED display screen (13) and the automatic lamp switching device (12) are arranged on one side of the main singlechip (11).
7. The system as claimed in claim 1, wherein the control system for automatic counting in classroom is characterized in that: the automatic light switching device (12) is a circuit breaker.
8. The control method of the control system for automatic counting in classroom according to claim 1, wherein: the method comprises the following steps:
s1: the first pressure sensor (3) and the second pressure sensor (5) respectively detect the pressure changes on the first floor (2) and the second floor (4) inside and outside the classroom door, and then judge whether the classroom door is used for people to enter or exit; when the signal intensity generated by the pressure sensor does not exceed a preset threshold value, the slave single chip microcomputer (1) judges that other objects which cause the pressure sensor to generate signals are not counted;
s2: whether a person enters a classroom is judged according to the signal generation sequence of the first pressure sensor (3) and the second pressure sensor (5): counting if only the first pressure sensor (3) or the second sensor (5) generates a signal; if the first pressure sensor (3) generates a signal firstly and the second pressure sensor (5) generates a signal later, the person is judged to enter the classroom; if the second pressure sensor (5) generates a signal firstly and the first pressure sensor (3) generates a signal later, the person is judged to leave the classroom;
s3: the slave single chip microcomputer (1) judges the personnel entering the classroom again according to the signal of the first laser receiver (16), and the verification step S2 is carried out;
s4: a first laser emitter (15) and a first laser receiver (16) on the first door frame (14) count, and the data of people entering and leaving the door is calculated from the single chip microcomputer (1), so that the number of people entering the classroom from the door is obtained;
s41: the slave single chip microcomputer (1) judges whether a person enters or exits a classroom according to signals of the first pressure sensor (3), the second pressure sensor (5) and the first laser receiver (16): if the person enters the classroom, the number of the persons left in the classroom by the counting unit is increased by one; if the person leaves the classroom, the number of the persons left in the classroom by the counting unit is reduced by one;
s5: the number of people passing in and out of the door is uploaded to the main single chip microcomputer (11) by the slave single chip microcomputer (1) through the Bluetooth module at regular intervals, the main single chip microcomputer (11) obtains the number of real-time people in the classroom according to the received number of people passing in and out of each door, and then the LED display screen (13) is controlled to display the number of people in the classroom;
s6: the main single chip microcomputer (11) obtains the residual seat number in the classroom according to the total seat number in the classroom and the calculated number of people in the classroom, the main single chip microcomputer (11) uploads the number of people in the classroom and the residual seat number to a school data center through an Ethernet module at regular intervals, and students inquire the residual seat number in the classroom at an APP terminal;
s7: if the number of people in the current classroom calculated by the main single-chip microcomputer (11) is 0, the main single-chip microcomputer (11) performs countdown by using a self-contained timer, and when the preset countdown time is 0, the automatic light switching device (12) is controlled to switch off the illuminating lamp in the classroom.
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