CN106707841A - Automatic door security protection intelligent monitoring system - Google Patents
Automatic door security protection intelligent monitoring system Download PDFInfo
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- CN106707841A CN106707841A CN201610900213.9A CN201610900213A CN106707841A CN 106707841 A CN106707841 A CN 106707841A CN 201610900213 A CN201610900213 A CN 201610900213A CN 106707841 A CN106707841 A CN 106707841A
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 10
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 36
- 238000001514 detection method Methods 0.000 claims abstract description 29
- 238000004891 communication Methods 0.000 claims abstract description 19
- 239000002184 metal Substances 0.000 claims abstract description 15
- 238000012545 processing Methods 0.000 claims description 20
- 230000009467 reduction Effects 0.000 claims description 11
- 238000006243 chemical reaction Methods 0.000 claims description 10
- 230000008878 coupling Effects 0.000 claims description 5
- 238000010168 coupling process Methods 0.000 claims description 5
- 238000005859 coupling reaction Methods 0.000 claims description 5
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 4
- 238000007689 inspection Methods 0.000 claims description 2
- 230000003750 conditioning effect Effects 0.000 abstract 2
- 230000010355 oscillation Effects 0.000 abstract 2
- 239000007789 gas Substances 0.000 description 18
- 238000010586 diagram Methods 0.000 description 14
- 230000008859 change Effects 0.000 description 13
- 230000005611 electricity Effects 0.000 description 11
- 238000000034 method Methods 0.000 description 8
- 230000035945 sensitivity Effects 0.000 description 8
- 238000001914 filtration Methods 0.000 description 7
- 230000006870 function Effects 0.000 description 6
- 238000013461 design Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 230000003321 amplification Effects 0.000 description 3
- 238000003199 nucleic acid amplification method Methods 0.000 description 3
- 238000012935 Averaging Methods 0.000 description 2
- 238000013500 data storage Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 241000790917 Dioxys <bee> Species 0.000 description 1
- 241001274660 Modulus Species 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 125000003158 alcohol group Chemical group 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000004397 blinking Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/08—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
- G01V3/10—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices using induction coils
- G01V3/101—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices using induction coils by measuring the impedance of the search coil; by measuring features of a resonant circuit comprising the search coil
Abstract
The invention provides an automatic door security protection intelligent monitoring system, which comprises a central processor, a power supply circuit, a serial communication module, an alcohol detection circuit, a metal coil oscillation circuit, a signal acquisition and conditioning circuit, an LCD display screen and a sound-light alarm module, wherein the metal coil oscillation circuit is connected with the central processor by means of the signal acquisition and conditioning circuit, the central processor is connected with the serial communication module, the alcohol detection circuit, the LCD display screen and the sound-light alarm module, the power supply circuit is connected with the central processor and is used for supplying power to the central processor, and the central processor is connected with a PC by means of the serial communication module. The automatic door security protection intelligent monitoring system takes a single chip microcomputer as the core, and intelligently judges whether a visitor is dangerous according to detection values of sensors by means of the single chip microcomputer through detecting three kinds of dangerous goods such as metal, alcohol and combustible products.
Description
Technical field
The present invention relates to building automatic field, more particularly to a kind of automatically-controlled door safety precaution intelligent monitor system.
Background technology
Traditional automatically-controlled door is that people can be authorized the control for being identified as enabling signal near the action of door or certain introduction
Unit, opens door using drive system, and people automatically closes door after leaving, and to opening and closing control realization
System.In addition, the various automatic door specials of recognizable control, such as infrared induction door, touch sensible door, microwave induced door, brush
Card induction door etc. is appeared in trend of the market in succession.At present, automatically-controlled door has been widely used for various occasions, market, bank,
Station etc..
However, these automatically-controlled doors function without safety precaution.And compare for the safety precaution grade such as bank, school
Public place high, automatic safety door used is that possess metal detection, inflammable thing detection, and this is to crime prevention event
It is very necessary.
The content of the invention
The present invention is directed to existing automatically-controlled door, it is proposed that design an intelligent monitoring system for it using single-chip microcomputer and sensor
System.
The present invention is realized according to following technical scheme：
A kind of automatically-controlled door safety precaution intelligent monitor system, it is characterised in that：Including central processing unit, power circuit, string
Mouth communication module, alcohol detection circuit, wire coil oscillating circuit, signal collection modulation circuit, LCD display and acousto-optic report
Alert module, PC, the wire coil oscillating circuit are connected by the signal collection modulation circuit with the center treatment, institute
State central processing unit respectively with the serial communication module, the alcohol detection circuit, the LCD display and the acousto-optic
Alarm module is connected, and the power circuit is connected with the central processing unit, described for being powered for the central processing unit
Central processing unit is connected with the serial communication module.
Further, the wire coil oscillating circuit includes multivibrator, and resistance R1 and resistance R2 is multi-resonant
The timing element of device is swung, one end connection power supply of resistance R1, the other end and the R2 series connection of resistance R1 and electric capacity C1 are connected in series, electricity
Hold C1 ground connection, the pin of open-collector output 7 is accessed in the middle of resistance R1 and R2, the pin of triggering input 2 and valve of timer
The value pin of input 6 is connected with electric capacity C1, and extraneous control signal is grounded by electric capacity C2, the pin of positive pulse signal 3 of output
The base terminal of Q1 amplifying circuits is input to by electric capacity C3, after amplifying by Q1 amplifying circuits, in input to inductance coil L1,
A constant alternating magnetic field is produced around inductance coil L1.
Further, the signal collection modulation circuit includes that operational amplifier LM324, electric capacity C11 make by coupling
With the input that the output signal of the wire coil oscillating circuit is sent to the operational amplifier LM324, the computing
Amplifier LM324 be amplified after by voltage signal conversion voltage in couples.
Further, the alcohol detection circuit includes that gas sensor, data processing module, safe threshold set electricity
Road and threshold values storage system, the data processing module respectively with the gas sensor, the safe threshold set circuit and
The threshold values storage system connection.
Further, the gas sensor is MQ-3 alcohol sensors, the air-sensitive material of the MQ-3 alcohol sensors
Expect to be tin ash.
Further, described safe threshold sets circuit to be included resistance R4, resistance R5, resistance R6 and corresponds to respectively
In resistance R4, resistance R5, the button S2 of resistance R6, button S3, button S4, described button S2 is used to set threshold values, described
Button S3 is used to increase threshold values, and described button S4 is used to reduce threshold values.
Further, the LCD display is industrial character mode lcd display screen LCD1602.
Further, described acoustooptic alarm system includes acousto-optic diode, buzzer and PNP triode, described
PNP triode be used for drive circuit, described acousto-optic diode is connected in parallel with the buzzer.
Further, described power circuit includes the first reduction voltage circuit and the second reduction voltage circuit, the first described drop
Volt circuit includes a circuit of three-terminal voltage-stabilizing integrated block LM7809, and second reduction voltage circuit includes that another three-terminal voltage-stabilizing is integrated
Circuit block LM2940-5s.
The present invention compared with prior art, with obvious beneficial effect：The detectable visitor of monitoring system of the invention has
Without dangerous material are carried, if carrying cutter, firearms are flammable, during explosive material, are automatically switched off automatically-controlled door, so as to improve automatically-controlled door
Safety precaution grade.Additionally, monitoring system simple structure of the invention, cheap, and it is convenient to mounted automatically-controlled door
Carry out safety upgrade so that automatically-controlled door of the tradition without intelligent monitoring ability improves the economy after safe class, and the system reform
Expense is not high, and retrofit work amount is few.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is a kind of automatically-controlled door safety precaution intelligent monitor system principle schematic of the invention；
Fig. 2 is sound and light alarm module schematic diagram of the invention；
Fig. 3 is that safe threshold of the invention sets circuit diagram；
Fig. 4 is serial communication module circuit diagram of the invention；
Fig. 5 is the threshold values storage system circuit diagram of eeprom chip of the invention；
Fig. 6 is wire coil oscillating circuit schematic diagram of the invention；
Fig. 7 is electromagnetic signal acquisition modulate circuit schematic diagram of the invention；
Fig. 8 is MQ-3 alcohol sensors module principle figure of the invention；
Fig. 9 is power-supplying circuit schematic diagram of the invention；
Figure 10 is metal detection flow chart of the invention；
Figure 11 is Keyboard Control flow chart of the invention；
Figure 12 is digital filtering flow chart of the invention；
Figure 13 is display alarm flow chart of the invention.
Specific embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
A part of embodiment of the present invention, rather than whole embodiments.
Fig. 1 is a kind of automatically-controlled door safety precaution intelligent monitor system principle schematic of the invention, as shown in figure 1, a kind of
Automatically-controlled door safety precaution intelligent monitor system, it is characterised in that：Including central processing unit, power circuit, serial communication module, wine
Essence detection circuit, wire coil oscillating circuit, signal collection modulation circuit, LCD display and sound and light alarm module, PC,
The wire coil oscillating circuit is connected by the signal collection modulation circuit with the center treatment, the central processing unit
Connect with the serial communication module, the alcohol detection circuit, the LCD display and the sound and light alarm module respectively
Connect, the power circuit is connected with the central processing unit, for being powered for the central processing unit, described central processing unit
It is connected with the serial communication module.
Fig. 2 is sound and light alarm module schematic diagram of the invention, and the present invention drives electricity using a transistor of PNP
Road, selects the pin P3.4 of STC single-chip microcomputers to connect the input port of PNP transistor base stage during design circuit.When STC single-chip microcomputers
Pin P3.4 when being externally output as high level " 1 ", the PNP triode would be at conducting state, and voltage has+5V, the voltage
The two ends of the buzzer of value input piezoelectric type cause that it sends tweeting sound；When P3.4 is in normal condition, that is, it is output as low electricity
When flat " 0 ", now PNP triode is then in cut-off state, the two ends of the buzzer of piezoelectric type is forced without voltage, at this moment buzzing
Device will not send the alarm of buzz.If buzzer is connected with light emitting diode by way of parallel connection, I/O ends can be saved
Mouthful, it is also possible to save the resource of the hardware of single-chip microcomputer.Certainly, while buzzer sounds the alarm and rings, the diode of series connection
Also light can at once be sent.The function of PNP triode is equivalent to a switch, then employs 8550 triodes to drive electricity
Road.
In the present invention, the alcohol detection circuit includes that gas sensor, data processing module, safe threshold set circuit
With threshold values storage system, the data processing module respectively with the gas sensor, the safe threshold set circuit and institute
State the connection of threshold values storage system.The gas sensor is MQ-3 alcohol sensors, the air-sensitive material of the MQ-3 alcohol sensors
Expect to be tin ash.
Fig. 3 is that safe threshold of the invention sets circuit diagram, and described safe threshold sets circuit includes resistance R4, resistance
R5, resistance R6 and correspond respectively to resistance R4, resistance R5, the button S2 of resistance R6, button S3, button S4, described button
S2 is used to set threshold values, and described button S3 is used to increase threshold values, and described button S4 is used to reduce threshold values.Resistance R4, resistance
R5, the size of resistance R6 are all 1k Ω.
LCD display is industrial character mode lcd display screen LCD1602, is directly connected with central processing unit.
Fig. 4 is serial communication module circuit diagram of the invention, for the alcohol concentration that will be detected in surrounding environment
PC is sent to combustable gas concentration value, communication module pattern is to carry out mutually transmitting data in the form of serial ports.By
It is RS232 level in the serial ports of PC, serial line interface is but Transistor-Transistor Logic level, it is therefore desirable to level conversion, level can be relied on
Conversion chip MAX232 complete, detection circuit and PC can just be coupled together after conversion.The pin of chip 6 is by electricity
Hold C10 ground connection, the pin of chip 2 is connected by electric capacity C9 with VCC, and 1 pin is connected with 3 pins by electric capacity C6, pin 4 and pin
5 are connected by electric capacity C4, and 10 pins connect a resistance R13, and 11 pins are connected by resistance R10 with VCC, and 16 pins directly connect
VCC is met, 15 pins ground connection, 9 pins connection resistance R16,8 pins are connected with 3 pins of connector, and 7 pins draw with the 2 of connector
Pin is connected.Resistance R10, resistance R13, the value of resistance R16 are all 10K Ω, electric capacity C4, electric capacity C6, electric capacity C9, the value of electric capacity C10
All it is the 10 4 power pico farads for being multiplied by 10, that is, 100000pF.
At the same time, it is necessary to set rule to ensure the intelligent monitor system and PC normal communication of safety door, the present invention
In, baud rate should be set as 9600bps, and it is 1 that the form of information should be arranged to start bit, and stop position is 1, and data bit is 8,
There is no parity check bit；Asynchronous serial interface communication mode is also realized, PC receives the mode of data using the method for inquiry, and
The intelligent monitor system of safety door is then the control command for receiving PC using interrupt mode.
Fig. 5 is the threshold values storage system circuit diagram of eeprom chip of the invention, it is contemplated that the exceeded report of ethanol gas concentration
Alert system may can be different because of different detection environment, threshold value setting, while in order to prevent from use may
The interim of appearance is stopped power supply suddenly, in order to avoid such case, an outside EEPROM module is increased, for completing externally
The storage of portion's data, intelligent monitor system of the invention is from the communication modes EEPROM AT24C04 based on I2C buses.
AT24C02 is a class eeprom chip of 2Kbit (256Bytes) the type I2C buses produced under atmel corp.
Wherein, the SDA pins of AT24C02 chips are not only the serial address of I2C buses, are also data input and output
Pin, in the design of circuit element, it is a two-way data transmission port, in general, as transfer address and
Data enter device inside, or the element as reception data is used in a device.Due to being open-drain, therefore it is accomplished by
A pull-up resistor in external connection, so ability protection circuit are realized normally using.And why SDA can transmit data, only
Can be when SCL serial clocks be low level state.And when SCL is high level, the situation of change of SDA be as indicate to start with
The condition of stopping.
The SCL pins of AT24C02 chips are the serial clock ports of I2C bus clocks, between synchronous master-slave equipment
Time.The threshold value of ethanol gas concentration will be stored in eeprom chip AT24C02, wherein, pin A0, A1 and A2 are chip
Addressing of address pin, due to only one of which 24C02 in circuit, thus only need to this three pins simultaneously be connected to ground terminal.
And pin SCL and SDA is the clock line and data wire of the I2C buses that device AT24C02 carries out communication exchanges with single-chip microcomputer.VCC
Resistance R23 is connected between pin and SCL pins, resistance R25, resistance R23, resistance R25 are connected between VCC pin and SDA pins
Resistance value be 10K Ω.
Fig. 6 is wire coil oscillating circuit schematic diagram of the invention, and wire coil oscillating circuit includes multivibrator, electricity
Resistance R1 and resistance R2 is the timing element of multivibrator, one end connection power supply of resistance R1, the other end and the R2 string of resistance R1
Connection and electric capacity C1 are connected in series, and electric capacity C1 ground connection, the pin of open-collector output 7 is accessed in the middle of resistance R1 and R2, timer
The pin of triggering input 2 and the pin of threshold values input 6 be connected with electric capacity C1, extraneous control signal is grounded by electric capacity C2,
The pin of positive pulse signal 3 of output is input to the base terminal of Q1 amplifying circuits by electric capacity C3, and it is amplified by Q1 amplifying circuits
Afterwards, it is input into inductance coil L1, a constant alternating magnetic field is produced around inductance coil L1.Inductance coil and resistance
NC1 is in parallel, wherein, electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C5, the size of electric capacity C7 are the 10 3 power pico farads for being multiplied by 10, electricity
Resistance R1, resistance R2, the resistance value of resistance R10 are 2K Ω, and resistance R9 is that 18K Ω, resistance R11 are that 675 Ω, resistance R12 are 200
Ω, resistance NC1 are 1K Ω.
Fig. 7 is electromagnetic signal acquisition modulate circuit schematic diagram of the invention, and the system is integrated using ALELGRO companies of the U.S.
Linear hall sensor is used for monitoring the change of coil Ll surrounding magnetic fields.The major function of integrated linear Hall sensor can be
The magnetic field intensity signal for sensing linearly is changed into voltage signal.The integrated linear Hall sensor by Hall element, penetrate
Pole follower is integrated on same semiconductor chip with the linear differential amplifier of high-gain property, is driven by dispatch from foreign news agency potential source.
However, the voltage signal that linear hall element is collected is substantially a voltage signal for millivolt level, signal ratio
It is fainter, it need to be amplified, can just be further processed the signal.Operational amplifier LM324 of the present invention, integrated line
Property Hall element output small-signal, electric capacity C11 passed the output signal of the wire coil oscillating circuit by coupling
The input of the operational amplifier LM324 is sent to, the operational amplifier LM324 changes voltage signal after being amplified
Voltage in couples.
In the circuit design of system, for the different signal of intensity, the amplification system of prime is may be adjusted
Feedback potentiometer size so as to change its multiplication factor.By the amplification signal of the operational amplifier of prime by coupling
It is input into the peak detection circuit system of rear class after conjunction electric capacity C14.Take the mode of resistance-capacitance coupling, it becomes possible to will be front and rear
The quiescent point of the circuit system of level keeps absolute construction, influencing each other between isolation quiescent points at different levels, the electricity
Total temperature drift on road would not be too big.
And peak detection circuit is mainly and be made up of two-stage calculation amplifier, the operational amplifier LM324 of the first order is defeated
The peak value for entering signal is delivered to electric capacity C16, and remains behind；Second level operational amplifier LM324 constitutes buffer amplifier structure,
Come output signal and electric capacity are mutually isolated.
1. when input voltage Vi2 starts to occur rising, Vo2 can also change therewith causes numerical value to rise so that two
Pole pipe D3 and D4 is both turned on, and diode D2 is in cut-off state, and operational amplifier LM324 is in profound and negative feedbck state, electric capacity
C16 is started to charge up, and Vc magnitudes of voltage rise.
2. when input voltage Vi2 starts to occur declining, Vo2 can also change therewith causes numerical value to decline, D2 conductings,
Operational amplifier LM324 is also at profound and negative feedbck state, but profound and negative feedbck can at least ensure that diode D3, D4
Reliable cut-off, the magnitude of voltage of Vc can be maintained.
3. when input voltage Vi2 starts again at rising, Vo2 can be made to increase again, and D3, D4 are on, D2
In cut-off, if (and magnitude of voltage when ensureing that voltage Vc is higher than previous charging) is now charged to electric capacity C16 again,
When input voltage Vi2 declines, diode D3, D4 can be in cut-off state again, and diode D2 begins to turn on, and Vc will
Peak state is kept again.
Output voltage Vo can be with the size of reflecting voltage Vc, and the faint voltage signal for collecting is by peak-detector circuit
And the circuit of rear class Hyblid Buffer Amplifier can be amplified to the DC level state of 0-5V, so as to the A/D moduluses for meeting single-chip microcomputer turn
The transformation range of the input voltage required by mold changing block, finally again by A/D analog-to-digital conversion modules circuit the peak value for detecting
Signal changes into digital quantity.
Wherein, electric capacity C11 is that 22uF, electric capacity C14 are that 10uF, electric capacity C16 are 100pF, resistance R17, resistance R18, resistance
R19, resistance R22 are for 20K Ω, resistance R21 are that 470K Ω, resistance R24 are 500K Ω, the maximum resistance of variable resistor R20
For the maximum resistance of 50K Ω and variable resistor R27 is 5K Ω.
Fig. 8 is MQ-3 alcohol sensors module principle figure of the invention, and the gas sensitive of MQ-3 alcohol sensors is dioxy
Change tin.When there is alcohol steam particle in the air that gas sensor MQ-3 is placed, gas sensor MQ-3
Electrical conductivity will because the alcohol steam in environment be alcohol gas concentration change change, alcohol gas concentration increase
Added-time, electrical conductivity also increases therewith, and the present invention can realize that alcohol steam concentration is gathered.
Fig. 9 is power-supplying circuit schematic diagram of the invention, and described power circuit includes the first reduction voltage circuit and second
Reduction voltage circuit, the first described reduction voltage circuit includes a circuit of three-terminal voltage-stabilizing integrated block LM7809, second reduction voltage circuit
Including another circuit of three-terminal voltage-stabilizing integrated block LM2940-5s.
Figure 10 is metal detection flow chart of the invention, when detection range does not have metal, it is assumed that the output electricity at Hall end
It is U to press0, voltage signal U0It is clearly very faint, only belong to mV grades of signal, voltage signal U0By the amplification of amplifying circuit, then lead to
Cross after the detecting circuit of peak value, can just obtain the peak output voltage U of corresponding 0~5V0, and to meet the amount of ADC0809
Journey, by after the A/D analog-to-digital conversions in single-chip microcomputer, by output voltage U0Digital quantity be input to STC single-chip microcomputers and stored.This
Afterwards, just the voltage signal can be regarded as reference voltage.
When there is detection coil L1During near metal object, according to the phenomenon of electromagnetic induction, will send out detection inductance value
Raw to change, so as to cause the magnetic field around it also accordingly to change, Hall element senses the magnetic field having changed and for, will
It is linearly changed into voltage signal Ux, the voltage changed by changes of magnetic field by amplifying circuit and peak-detector circuit it
Afterwards, the peak output voltage U of corresponding 0-5V is obtainedx, and then again by A/D analog-to-digital conversions after, be entered into center
Processor CPU, is completed to peak output voltage U by central processor CPUxWith reference voltage U0Contrast, the two is compared to each other it
Afterwards, by (Ux-U0) difference is can obtain, the difference is compared again with default sensitivity △ U.Sensitivity △ U can be by keyboard
Control circuit in each key be input into, the respective value after LCD display can press each key shows, certainly, spirit
The setting of the size of sensitivity △ U by the precision that directly decide system just.If | Ux-U0|>△ U, determine that what is detected
Output signal is gone to drive the light emitting diode carry out luminous carrying by the really metal of article, the delivery outlet P1.0 of central processor CPU
Show alarm indication, while P3.4 control buzzer sensings send the sound, carry out audible alarm prompting.
Similarly, when gas is detected, first have to be preheated three minutes to MQ-3 gas sensors.Program initialization terminates
Afterwards, system enters monitor state, and at the same time the heater strip to sensor MQ-3 carries out fault detect investigation, then takes software to survey
The method of examination checks whether the heater strip or cable of sensor broken string occur or situations such as loose contact, investigates one by one
After reuse.Then the gas concentration signal by being detected to sensor passes to single-chip microcomputer and carries out data after carrying out A/D conversions
Treatment, concentration value is compared with alarm limit setting value, if in environment alcohol concentration value carry out if the safety threshold alarm with
Open exhaust apparatus and otherwise continue detection.
Figure 11 is Keyboard Control flow chart of the invention.First, initialize, and open interruption, then call keyboard scanning
Program, will determine whether that key is pressed, if then calling key assignments to judge subprogram, including function key, plus 1 key, the key that subtracts 1, really
Determine key.
Figure 12 is digital filtering flow chart of the invention, and the noise inhibiting ability of metal-detecting function is the master of metal detection
Want design objective.Due to often encountering various instantaneous interferences, intelligent monitoring system of the invention in collection voltages value
System solves the problems, such as instantaneous interference using the method for digital averaging filtering, i.e., in the gatherer process of primary voltage value, rapidly
Ground carries out at least 6 times collections to magnitude of voltage in a short period of time, after magnitude of voltage is converted to digital quantity, then sues for peace, and analyzes
The maxima and minima gone out in this 6 times inputs, then deletes maxima and minima, and the side of average value is obtained divided by number 4
Method, completes data acquisition filtering.The present invention is set using the hardware circuit that the method for digital averaging filtering can save complexity
Meter, and more preferable, more accurate filter effect can also be obtained.
It can be seen from above-mentioned filtering method, pendulous frequency N is bigger, and signal smoothing degree is higher, and sensitivity is just reduced, but
The control system is to need sensitivity higher, thus pendulous frequency N values be difficult it is excessive.One starting sample cycle is set,
Then continuous sampling 6 times, delete maxima and minima in sampled data, remaining data are carried out into accumulating operation, then ask
Its arithmetic mean of instantaneous value, using the value as the sampled value in this cycle, then the internal storage RAM that the final data is stored to single-chip microcomputer
In headed by 30H location data storage.Wherein, maximum is stored in register R2On, minimum value is stored in register R3On,
Add up and deposit in register R4, the times N of continuous sampling deposits in R0。
Figure 13 is display alarm flow chart of the invention, and the setting of the value of its medium sensitivity △ U is key issue, in program
The value of △ U is stored in the 20H addresses of single-chip microcomputer memory RAM.In detection process, the electricity that A/D converter is collected
Pressure signal, is stored in internal storage RAM in the data storage with first location as 30H, then by this data after numerical filtering
Ux and reference voltage U0It is compared, the two difference U is stored in the memory that Chip Microcomputer A RM addresses are 22H.Then pass through again
Be compared for this difference U and sensitivity △ U by criterion algorithm, to determine whether each set by alarm keys disk control circuit
The value of sensitivity, and the corresponding numerical value after LCD display display button.
Intelligent monitor system of the invention with single-chip microcomputer as core, the inspection to metal, alcohol and the class dangerous material of inflammable thing three
Survey, whether certain risk is had according to sensor detected value intelligent decision visitor by single-chip microcomputer, such as there is certain risk
The system of closing the door will be started automatically by magnetic valve.Wherein, metal detection is led to using integrated linear hall element as sensor
The eddy current effect for crossing sensing metal causes the change in hot-wire coil magnetic field, then changes of magnetic field is converted into voltage change, by monolithic
Machine measures magnitude of voltage, and compared with a reference value of the voltage of setting after, judge whether to detect metal；Alcohol detection
It is then, to alcohol concentration, analog-to-digital conversion and treatment to be carried out to signal by single-chip microcomputer using the test of MQ-3 alcohol gas sensors,
Signal output is shown with liquid crystal display again, but also with threshold value setting function, can setting according to laws and regulations or user
Fixed to change threshold values, as long as concentration of alcohol exceedes the threshold values of setting, system will make blinking red lamp alarm；And detection of natural gas with
Alcohol detection principle is substantially similar.
Based on the embodiment in the present invention, those of ordinary skill in the art are obtained under the premise of creative work is not made
The all other embodiment for obtaining, belongs to the scope of protection of the invention.Although the present invention is illustrated with regard to preferred embodiment
And description, it is understood by those skilled in the art that without departing from scope defined by the claims of the present invention, can be with
Variations and modifications are carried out to the present invention.
Claims (9)
1. a kind of automatically-controlled door safety precaution intelligent monitor system, it is characterised in that：Including central processing unit, power circuit, serial ports
Communication module, alcohol detection circuit, wire coil oscillating circuit, signal collection modulation circuit, LCD display and sound and light alarm
Module, the wire coil oscillating circuit is connected by the signal collection modulation circuit with the center treatment, the center
Processor respectively with the serial communication module, the alcohol detection circuit, the LCD display and the sound and light alarm mould
Block is connected, and the power circuit is connected with the central processing unit, for being powered for the central processing unit, described centre
Reason device is connected with the serial communication module.
2. a kind of automatically-controlled door safety precaution intelligent monitor system according to claim 1, it is characterised in that：The metal wire
Circle oscillating circuit includes multivibrator, and resistance R1 and resistance R2 is the timing element of multivibrator, and one end of resistance R1 connects
Power supply is connect, the other end and the R2 series connection of resistance R1 and electric capacity C1 are connected in series, and electric capacity C1 ground connection, open-collector output 7 draws
Pin is accessed in the middle of resistance R1 and R2, and the pin of triggering input 2 and the pin of threshold values input 6 of timer are connected with electric capacity C1, outward
Boundary's control signal is grounded by electric capacity C2, and the pin of positive pulse signal 3 of output is input to Q1 amplifying circuits by electric capacity C3
Base terminal, after amplifying by Q1 amplifying circuits, in input to inductance coil L1, produces a perseverance around inductance coil L1
Fixed alternating magnetic field.
3. a kind of automatically-controlled door safety precaution intelligent monitor system according to claim 1, it is characterised in that：The signal is adopted
Collection modulate circuit includes that operational amplifier LM324, electric capacity C11 pass through coupling by the output of the wire coil oscillating circuit
Signal is sent to the input of the operational amplifier LM324, and the operational amplifier LM324 believes voltage after being amplified
Number conversion voltage in couples.
4. a kind of automatically-controlled door safety precaution intelligent monitor system according to claim 1, it is characterised in that：The alcohol inspection
Slowdown monitoring circuit includes that gas sensor, data processing module, safe threshold set circuit and threshold values storage system, the data processing
Module sets circuit with the gas sensor, the safe threshold respectively and the threshold values storage system is connected.
5. a kind of automatically-controlled door safety precaution intelligent monitor system according to claim 4, it is characterised in that：The air-sensitive is passed
Sensor is MQ-3 alcohol sensors, and the gas sensitive of the MQ-3 alcohol sensors is tin ash.
6. a kind of automatically-controlled door safety precaution intelligent monitor system according to claim 4, it is characterised in that：Described safety
Threshold values sets circuit to be included resistance R4, resistance R5, resistance R6 and corresponds respectively to resistance R4, resistance R5, the button of resistance R6
S2, button S3, button S4, described button S2 are used to set threshold values, and described button S3 is used to increase threshold values, described button
S4 is used to reduce threshold values.
7. a kind of automatically-controlled door safety precaution intelligent monitor system according to claim 1, it is characterised in that：The LCD shows
Display screen is industrial character mode lcd display screen LCD1602.
8. a kind of automatically-controlled door safety precaution intelligent monitor system according to claim 1, it is characterised in that：Described acousto-optic
Warning system includes acousto-optic diode, buzzer and PNP triode, and described PNP triode is used for drive circuit, described
Acousto-optic diode is connected in parallel with the buzzer.
9. a kind of automatically-controlled door safety precaution intelligent monitor system according to claim 1, it is characterised in that：Described power supply
Circuit includes the first reduction voltage circuit and the second reduction voltage circuit, and the first described reduction voltage circuit includes a circuit of three-terminal voltage-stabilizing integrated
Block LM7809, second reduction voltage circuit includes another circuit of three-terminal voltage-stabilizing integrated block LM2940-5s.
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|---|---|---|---|
| CN201610900213.9A CN106707841A (en) | 2016-10-14 | 2016-10-14 | Automatic door security protection intelligent monitoring system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610900213.9A CN106707841A (en) | 2016-10-14 | 2016-10-14 | Automatic door security protection intelligent monitoring system |
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Application publication date: 20170524 |