CN104464176B - Place occupying warning system - Google Patents
Place occupying warning system Download PDFInfo
- Publication number
- CN104464176B CN104464176B CN201410857141.5A CN201410857141A CN104464176B CN 104464176 B CN104464176 B CN 104464176B CN 201410857141 A CN201410857141 A CN 201410857141A CN 104464176 B CN104464176 B CN 104464176B
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- China
- Prior art keywords
- threshold
- value
- pressure
- infrared
- unit
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B5/00—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied
- G08B5/22—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied using electric transmission; using electromagnetic transmission
- G08B5/221—Local indication of seats occupied in a facility, e.g. in a theatre
Abstract
The invention provides a place occupying warning system used for warning the situation that a seat in a classroom is not used by a person temporarily but is occupied. The place occupying warning system is characterized by comprising a sensing portion installed on the seat, a control portion and a warning portion, the sensing portion comprises a pressure sensing unit used for collecting the pressure value of a desk or chair and an infrared sensing unit used for collecting the infrared value of the desk or the chair, the control portion comprises a setting unit for setting a first threshold and a second threshold, a judgment unit for comparing the pressure value with the first threshold and comparing the difference value of the infrared value and a former infrared value with the second threshold, a timing unit used for timing and a control unit used for controlling to give a warning signal, the warning portion gives warning information according to the warning signal, and when the judgment unit carries out comparison to obtain that the pressure value is smaller than the first threshold and further carries out comparison to obtain that the difference value is smaller than the second threshold and the timing unit overflows, the control unit gives the warning signal.
Description
Technical field
The present invention relates to a kind of occupy-place warning system.
Background technology
In classroom's room for individual study or library, whenever examination season arrive, classmates all can swarm room for individual study or
In library, so these are suitable for the seat in place reviewed one's lessons, and often supply falls short of demand.So, have part classmate probably due to from
Body reason cannot go to find seat in advance, so just entrusting other classmate's help occupy-places, although so resulting on a lot of seats
Thing has been put in face, but does not have classmate to use so that in addition a collection of classmate does not have position to sit at that for a long time.If rashly will account for
The thing of seat is taken away, and so can lead to the contradiction between classmate, thus destroying academic environment, if inquiry side is same
Whether someone uses to learn this seat, can bother the study of classmate, and can not keep the quiet environment of library.
Content of the invention
The present invention be carry out to solve above-mentioned problem it is therefore intended that provide a kind of can be temporary to the seat in classroom
When unmanned using but the situation of occupied seat warned, thus preventing from accounting for the occupy-place warning system of seat.
The invention provides a kind of occupy-place warning system, for the seat in classroom temporarily unmanned using but occupied seat
Situation is warned it is characterised in that being included：Detecting means, are arranged on seat, comprise for gathering desk or chair position
The pressure sensitive unit of pressure value and the infrared sensor cell for gathering the infrared value at desk or chair position；Control
Portion, comprises：Set the setup unit of first threshold and Second Threshold, pressure value and first threshold are compared and will be infrared
Judging unit that the difference of value and previous infrared value is compared with Second Threshold, the timing unit for timing and be used for
Control the control unit sending alarm signal；And warning part, according to alarm signal alert, wherein, single when judging
Unit compares and obtains pressure value and be less than first threshold, and compares further and obtain difference and be less than Second Threshold and timing unit overflowing
When, control unit sends alarm signal.
In occupy-place warning system provided by the present invention, can also have the feature that：Wherein, pressure sensitive unit bag
Containing the first pressure sensor being arranged under desk and the second pressure sensor being arranged under chair, infrared sensor cell comprises
The first infrared sensor being arranged under desk and the second infrared sensor being arranged under chair.
In occupy-place warning system provided by the present invention, can have the feature that：Wherein, first pressure sensor is adopted
Collect the first pressure value at table position, the second pressure value at second pressure sensor acquisition to chair position, pressure value
It is the meansigma methodss of the meansigma methodss of five first pressure values and second pressure value, setup unit is additionally operable to set the 3rd threshold value, when sentencing
Disconnected unit compares pressure value and is more than first threshold and is less than the 3rd threshold value, and compares difference more than Second Threshold, and control unit is sent out
Go out alarm signal.
In occupy-place warning system provided by the present invention, can have the feature that：Wherein, first pressure sensor and
Second pressure sensor is piezoresistive pressure sensor.
In occupy-place warning system provided by the present invention, can have the feature that：Wherein, warning part is LED warning
Lamp, warning message is that LED warning lamp enters line flicker according to alarm signal.
The effect of invention and effect
According to the occupy-place warning system that the present invention relates to, because the pressure sensitive unit of detecting means is to desk and chair
On pressure value be acquired, by the judging unit of control unit according to pressure value draw on seat may no one, and because red
Outer sensing unit is acquired to the infrared value at desk and chair, is worth on seat not having according to infrared by judging unit
People, sends alarm signal now by control unit thus controlling warning part alert, so other classmates are according to police
Show that the warning message in portion learns that this seat is by people's occupy-place, explanation can use this seat, so, the occupy-place alarm of the present invention
System can temporarily unmanned to the seat in classroom use but the situation of occupied seat warns, thus effectively preventing from accounting for seat.
Brief description
Fig. 1 is the structured flowchart of occupy-place warning system in embodiments of the invention；
Fig. 2 is the internal circuit diagram of embodiments of the invention mid-infrared sensor；
Fig. 3 is human body infrared Acquisition Circuit figure in embodiments of the invention；
Fig. 4 is the workflow diagram of occupy-place warning system in embodiments of the invention.
It is embodied as case
In order that technological means, creation characteristic, reached purpose and effect that the present invention realizes are easy to understand, real below
Apply example and combine accompanying drawing and the occupy-place warning system of the present invention is specifically addressed.
Fig. 1 is the structured flowchart of occupy-place warning system in embodiments of the invention.
As shown in figure 1, in the present embodiment, occupy-place warning system 100 is arranged in the room for individual study of university or library
In, also carry out accounting for the situation of seat for preventing a same scholar not on seat.
Occupy-place warning system 100 comprises：Detecting means 10, control unit 20 and warning part 30.
Detecting means 10 are arranged on room for individual study or the seat of library, for sensing the information between seat and people, pass
Sense portion 10 comprises：Pressure sensitive unit 11 and infrared sensor cell 12.
Pressure sensitive unit 11 is used for detecting the desk at a set of seat and the pressure of chair, comprises：First pressure sensor
11a and second pressure sensor 11b.First pressure sensor 11a is arranged on below desk and is used for gathering the first pressure of desktop
Value, second pressure sensor 11b is arranged on below chair and is used for gathering the second pressure value of chair.In the present embodiment, because this
System is not high to required precision, so first pressure sensor 11a and second pressure sensor 11b adopts pressure drag type pressure to pass
Sensor, piezoresistive pressure sensor price is less than other such as mechanical pick-up device, and pressure change is turned by piezoresistive pressure sensor
It is changed to corresponding resistance change, corresponding resistance is converted into by voltage signal by both arms bridge-type pressure detection circuit, when double
When the voltage of arm bridge-type pressure detection circuit output is positive pressure reduction, piezoresistive pressure sensor is in compressive state, works as both arms
The voltage of bridge-type pressure detection circuit output is that during reverse differential pressure, piezoresistive pressure sensor is in extended state.Both arms bridge-type pressure
The low voltage signal of power testing circuit outfan is amplified by difference amplifier.Realize putting by three operational amplification circuits
Greatly, three operational amplification circuits be made up of two trsanscondutance amplifiers and high gain amplifier so that amplifier have high
Direct current and alternating CMRR (CMRR).
Infrared sensor cell 12 is used for detecting at seat whether someone, comprises：First infrared sensor 12a and second infrared
Sensor 12b.First infrared sensor 12a is used for gathering the infrared value at table position, and the second infrared sensor 12b is used for adopting
The infrared value of Ji Yiziweizhichu.
Fig. 2 is the internal circuit diagram of embodiments of the invention mid-infrared sensor.
As shown in Fig. 2 the chip of the first infrared sensor 12a and the second infrared sensor 12b is BISS0001 chip.
OP1 is first stage amplifier, and OP2 is two-stage amplifier, and 2OUT is the simulation output of two-stage amplifier, and VO is digital output signal,
VRF is reference voltage, is directly connected with running voltage VDD in the system, and the system forms biography using using operational amplifier OP1
Sense signal pre-processing circuit, signal is amplified.Then it is coupled to operational amplifier OP2, then carries out second level amplification, system is by mould
Intend signal and send into single-chip microcomputer process, so selecting 2OUT here as analog output.
Fig. 3 is human body infrared Acquisition Circuit figure in embodiments of the invention.
As shown in figure 3,14 feet are the in-phase input end of first stage amplifier OP1, infrared thermal releasing signal thus collects, 16
Foot be OP1 amplifier out, output through C3 coupling after be connected with the input of 13 foot-OP2 amplifiers, amplified by 12
The outfan output of foot-OP2,10 feet are the bias current of operational amplifier, and 9 feet are connected with VDD, forbid BISS0001 digital end
Part produces output signal.In the present embodiment, the first infrared sensor 12a and the second infrared sensor 12b only requires detection
The infrared signal at this tables and chairs place, the distance of measurement is as far as possible little, Gu using the infrared biography being not added with optical lenses now sold on the market
Sense module.
Control unit 20 is connected with detecting means 10, and pressure value and infrared value for being gathered according to detecting means 10 control warning
Portion 30.In the present embodiment, control unit 20 selects stc12c5A60 series monolithic, and its running voltage 5V, with sensor phase
Join, carry 8 ADC mouths.
Control unit 20 comprises：Setup unit 21, judging unit 22, timing unit 23 and control unit 24.
Setup unit 21 sets first threshold, Second Threshold and the 3rd threshold value more than first threshold.
Judging unit 22 be used for pressure value is compared with first threshold and the 3rd threshold value, and by infrared value with previous
The difference of individual infrared value is compared with Second Threshold.Control unit 24 is calculated the of first pressure sensor 11a collection
The second pressure value of one pressure value and second pressure sensor 11b collection is averaged, and then takes the average of continuous 5 meansigma methodss
Value is compared as current pressure values (i.e. pressure value) and first threshold and the 3rd threshold value, is so capable of the fluctuation of average pressure
Make pressure value more reliable and more stable.In addition, control unit 24 is respectively to the first infrared sensor 12a and the second infrared sensor
The up-to-date 10 infrared values collecting of 12b are first done and are averagely obtained meansigma methodss A10 (as previous infrared value), 24 points of control unit
Other 5 infrared values collecting up-to-date to the first infrared sensor 12a and the second infrared sensor 12b are first done and are averagely obtained averagely
Value A05 (as infrared value).Judging unit 22 is by the difference (i.e. difference) between meansigma methodss A10 and meansigma methodss A05 and Second Threshold
It is compared.
Timing unit 23 is used for being timed, and comprises first timer and second timer.
Control unit 24 is connected with warning part 30, and control unit 24 sends alarm signal according to judging unit 22 comparative result
Number thus controlling whether warning part 30 is reported to the police.
Warning part 30 is arranged on the upper right side of desk, the alarm signal alert being sent according to control unit 24.
In the present embodiment, warning part 30 is LED warning lamp, and when LED warning lamp receives alarm signal, LED warning lamp enters line flicker,
Make classmates can be clearly apparent on each seat whether occupied seat, thus using this seat.
Fig. 4 is the workflow diagram of occupy-place warning system in embodiments of the invention.
As shown in figure 4, in the present embodiment, the specific workflow of occupy-place warning system 100 is as follows：
Step S1, first pressure sensor 11a and second pressure sensor 11b collection first pressure value and second pressure
Value, the first infrared sensor 12a and the second infrared sensor 12b gathers infrared value, respectively subsequently into step S2.
Step S2, control unit 24 is calculated current pressure values, subsequently into step S3.
Step S3, control unit 24 controls first timer to start, subsequently into step S4.
Step S4, judging unit 22 is compared with first threshold to current pressure values, whether big compares current pressure values
In first threshold, thus determine whether may someone on seat, when compare for no when, enter step S5a, when being judged as YES
When, enter step S5b.
Step S5a, judging unit 22 judges whether first timer overflows, and when being judged as YES, enters step S6a, when
When being judged as NO, enter step S6b.
Step S5b, judging unit 22 judges to current pressure values and the 3rd threshold value, judges whether current pressure values are little
In the 3rd threshold value, thus judging whether the people on this seat leaves seat for a long time, when being judged as YES, enter step S6b,
When being judged as NO, enter done state.
Step S6a, control unit 24 calculates the difference of infrared value and previous infrared value, subsequently into step S7a.
Step S6b, control unit 24 calculates the difference of infrared value and previous infrared value, subsequently into step S7b.
Step S7a, control unit 24 starts second timer, subsequently into step S8a.
Step S7b, control unit 24 starts second timer, subsequently into step S8b.
Step S8a, judging unit 22 judges that whether difference is more than Second Threshold, thus judging at seat whether someone, when
When being judged as YES, enter done state, when being judged as NO, enter step S9a.
Step S8b, judging unit 22 judges whether difference is more than Second Threshold, thus judging at seat, whether people leaves,
When being judged as NO, enter done state, when being judged as YES, enter step S9b.
Step S9a, judging unit 22 judges whether second timer overflows, and when being judged as YES, enters step S10, when
When being judged as NO, reenter step S8a.
Step S9b, judging unit 22 judges whether second timer overflows, and when being judged as YES, enters step S10, when
When being judged as NO, reenter step S8b.
Step S10, control unit 24 sends alarm signal, subsequently into step S11.
Step S11, warning part 30 according to the alarm signal alert receiving, subsequently into end.
The effect of embodiment and effect
Occupy-place warning system according to involved by the present embodiment, because the pressure sensitive unit of detecting means is to desk and chair
Pressure value on son is acquired, and draws possible no one on seat by the judging unit of control unit according to pressure value, and because
Infrared sensor cell is acquired to the infrared value at desk and chair, is worth on seat not having according to infrared by judging unit
Someone, sends alarm signal now by control unit thus controlling warning part alert, so other classmates according to
The warning message of warning part learns that this seat is by people's occupy-place, and explanation can use this seat, so, the occupy-place of the present embodiment
Warning system can temporarily unmanned to the seat in classroom use but the situation of occupied seat warns, thus effectively preventing from accounting for
Seat.
In the present embodiment, because the first pressure sensor of pressure sensitive unit and second pressure sensor are using pressure
Resistance pressure transducer, therefore, the present embodiment has the advantages that low cost.
In the present embodiment, because the infrared sensor of infrared sensor cell needs measurement distance little, and by adopting
The most freshly harvested 10 infrared datas as previous infrared value, the infrared value in the most freshly harvested 5 infrared data seats, therefore,
The present embodiment can reduce the fluctuation of short time data.
In the present embodiment, because warning part is LED warning lamp, therefore the present embodiment can make warning message by clearly
See, and do not produce any noise.
Above-mentioned embodiment is the preferred case of the present invention, is not intended to limit protection scope of the present invention.
Claims (3)
1. a kind of occupy-place warning system, for temporarily unmanned to the seat in classroom using but the situation of occupied seat warn,
It is characterized in that, including：
Detecting means, are arranged on described seat, comprise the pressure sensitive unit of the pressure value for gathering desk or chair position
And for gathering the infrared sensor cell of the infrared value at described desk or described chair position；
Control unit, comprises：Set the setup unit of first threshold and Second Threshold, described pressure value and described first threshold are entered
The judgement list that row is compared and is compared the difference of described infrared value and previous described infrared value with described Second Threshold
Unit, the timing unit for timing and the control unit sending alarm signal for control；And
Warning part, according to described alarm signal alert,
Wherein, it is less than described first threshold when described judging unit relatively obtains described pressure value, and compare further and obtain institute
When stating difference less than described Second Threshold and timing unit spilling, described control unit sends described alarm signal,
Described pressure sensitive unit comprises the first pressure sensor being arranged under described desk and is arranged under described chair
Second pressure sensor,
Described infrared sensor cell comprises the first infrared sensor being arranged under described desk and is arranged under described chair
Second infrared sensor,
The first pressure value at described table position for the described first pressure sensor acquisition, described second pressure sensor acquisition
Second pressure value at described chair position,
Described pressure value is the meansigma methodss of the meansigma methodss of five described first pressure values and described second pressure value,
Described setup unit is additionally operable to set the 3rd threshold value,
When the more described pressure value of described judging unit is more than described first threshold and is less than described 3rd threshold value and relatively more described
Difference is more than described Second Threshold, and described control unit sends described alarm signal.
2. occupy-place warning system according to claim 1 it is characterised in that：
Wherein, described first pressure sensor and described second pressure sensor are piezoresistive pressure sensors.
3. occupy-place warning system according to claim 1 it is characterised in that：
Wherein, described warning part is LED warning lamp,
Described warning message is that LED warning lamp enters line flicker according to alarm signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410857141.5A CN104464176B (en) | 2014-12-30 | 2014-12-30 | Place occupying warning system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410857141.5A CN104464176B (en) | 2014-12-30 | 2014-12-30 | Place occupying warning system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104464176A CN104464176A (en) | 2015-03-25 |
| CN104464176B true CN104464176B (en) | 2017-02-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410857141.5A Expired - Fee Related CN104464176B (en) | 2014-12-30 | 2014-12-30 | Place occupying warning system |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108010262B (en) * | 2017-11-15 | 2019-07-26 | 深圳中兴网信科技有限公司 | Occupy-place warning system, method, computer equipment and readable storage medium storing program for executing |
| CN108694792A (en) * | 2018-07-17 | 2018-10-23 | 华北理工大学 | Library's vacant seat detecting system |
| CN114698929B (en) * | 2022-04-19 | 2023-04-14 | 山东交通学院 | Library is with reading table |
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| CN203376826U (en) * | 2013-08-14 | 2014-01-01 | 上海电机学院 | Library seat monitoring device |
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| CN103896089A (en) * | 2012-12-28 | 2014-07-02 | 山东新北洋信息技术股份有限公司 | Medium overlapping detection method and medium treatment device |
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| CN101118196A (en) * | 2006-08-01 | 2008-02-06 | 株式会社电装 | Tire pressure monitor having capability of accurately detecting state of motion of vehicle |
| CN200997157Y (en) * | 2006-12-19 | 2007-12-26 | 辽宁科技大学 | Seat monitor |
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| CN104464176A (en) | 2015-03-25 |
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