CN206907200U

CN206907200U - A kind of Indoor Environment Detection early warning system

Info

Publication number: CN206907200U
Application number: CN201720930844.5U
Authority: CN
Inventors: 张艺源; 张祖红
Original assignee: Individual
Current assignee: Individual
Priority date: 2017-07-28
Filing date: 2017-07-28
Publication date: 2018-01-19
Anticipated expiration: 2027-07-28

Abstract

A kind of Indoor Environment Detection early warning system, the early warning system include sensor element, microcontroller and execution unit；The sensor element includes carbon dioxide sensor and sensor of natural gas, and the execution unit includes exhaust fan and gas valve；The carbon dioxide sensor and sensor of natural gas are connected by analog-digital converter with the input of microcontroller respectively, the output end of the microcontroller is connected with exhaust fan and gas valve respectively by connecting automatic control circuit, and the start and stop of control exhaust fan and gas valve are realized by the detection of carbon dioxide sensor and sensor of natural gas；Also include alarm module, the alarm module is connected with microcontroller, when microcontroller receive carbon dioxide sensor or sensor of natural gas detection value exceed preset value when, alarm module sends alarm signal.The system carries out detection early warning in real time to the air ambient of interior, to ensure the health of resident.

Description

A kind of Indoor Environment Detection early warning system

Technical field

It the utility model is related to environmental testing, and in particular to a kind of Indoor Environment Detection early warning system.

Background technology

With the popularization of various modernization household equipments and daily necessities, such as the use of natural gas, may produce a lot The gas of health of people is endangered, or even some pernicious gases cannot all be discovered with the sense organ of oneself.The dioxy of indoor air environment Change carbon, or natural gas that may be leaked etc. can all bring huge harm to the health of people.For the life of people Health, detection early warning is carried out to the environmental quality in family room and is very important.

The content of the invention

According to the deficiencies in the prior art, there is provided a kind of Indoor Environment Detection early warning system, air ring of the system to interior Border carries out detection early warning in real time, to ensure the health of resident.

The utility model is realized by following technical scheme：

A kind of Indoor Environment Detection early warning system, the early warning system include sensor element, microcontroller and execution unit； The sensor element includes carbon dioxide sensor and sensor of natural gas, and the execution unit includes exhaust fan and gas valve Door；The carbon dioxide sensor and sensor of natural gas are connected by analog-digital converter with the input of microcontroller respectively, The output end of the microcontroller is connected with exhaust fan and gas valve respectively by connecting automatic control circuit, by titanium dioxide The start and stop of control exhaust fan and gas valve are realized in the detection of carbon sensor and sensor of natural gas；Also include alarm module, institute State alarm module with microcontroller to be connected, when microcontroller receives the value of carbon dioxide sensor or sensor of natural gas detection During more than preset value, alarm module sends alarm signal.

Preferably, the alarm module includes buzzer and LED, the buzzer and LED respectively with microcontroller Device is connected.

Preferably, the carbon dioxide sensor uses MG811 sensors.

Preferably, the sensor of natural gas uses MQ-5 sensors.

Preferably, the automatic control circuit includes bidirectional triode thyristor type photoelectric coupling circuit MOC3041, phase inverter CD4069 and bidirectional triode thyristor；The output end of the microcontroller electrically connects with phase inverter CD4069 input, described anti-phase Device CD4069 output end electrically connects with bidirectional triode thyristor type photoelectric coupling circuit MOC3041 input, the bidirectional triode thyristor Type photoelectric coupling circuit MOC3041 output end electrically connects with bidirectional triode thyristor.

Preferably, the microcontroller uses STC89C52 single chip.

Preferably, the analog-digital converter uses ADC0809 converters.

The utility model beneficial effect：

After the carbon dioxide in air or concentration of natural gas value exceed normal scope, single-chip microcomputer can immediately make anti- Should, controlled accordingly.Buzzer drums, LED flash of light, will pair it has been proposed that warning, while opens exhaust fan Indoor gas discharge, extraneous fresh air enter room, so as to ensure that the air ambient of interior is adapted to live.For natural The leakage of gas, it can also start gas valve immediately, timely close valve.By being detected in real time to the air ambient of interior Early warning, to ensure the health of resident.

Brief description of the drawings

Fig. 1 is the utility model control principle block diagram；

Fig. 2 is singlechip minimum system circuit；

Fig. 3 is carbon dioxide sensor circuit；

Fig. 4 is sensor of natural gas circuit；

Fig. 5 is ventilation fan circuit；

Fig. 6 is gas valve circuit；

Fig. 7 is buzzer alarm circuit；

Fig. 8 is LED lamp alarm circuit.

Embodiment

Below in conjunction with accompanying drawing, the utility model is further described by specific embodiment.

As shown in figure 1, a kind of Indoor Environment Detection early warning system, the early warning system includes sensor element, microcontroller 40 and execution unit；Sensor element includes carbon dioxide sensor 10 and sensor of natural gas 20, and execution unit includes exhaust Fan 60 and gas valve 70；Carbon dioxide sensor 10 and sensor of natural gas 20 pass through analog-digital converter 30 and microcontroller respectively The input of device 40 is connected, the output end of microcontroller 40 by connect automatic control circuit 50 respectively with exhaust fan 60 and coal gas Valve 70 is connected, and control exhaust fan 60 and gas valve are realized by the detection of carbon dioxide sensor 10 and sensor of natural gas 20 The start and stop of door 70；Also include alarm module 100, alarm module 100 is connected with microcontroller 40, when microcontroller 40 receives two When the value that oxidation carbon sensor 10 or sensor of natural gas 20 detect exceedes preset value, alarm module 100 sends alarm signal.Report Alert module 100 includes buzzer 80 and LED 90, and buzzer 80 and LED 90 are connected with microcontroller 40 respectively.

As shown in Fig. 2 STC89C52 single chip has following standard feature：8k bytes Flash, 512 byte RAM, 32 I/O mouth lines, WatchDog Timer, built-in 4KB EEPROM, highest operation frequency 35MHz, 6T/12T are optional.

As shown in figure 3, MG811 be exactly it is a kind of be used for detecting the sensor of carbon dioxide, unlike infrared gas sensor that Sample is also in development, MG811 less expensives, has a technology of shaping, is also stable during use, and when using pair Carbon dioxide is directed to very much, can fast reaction, and even if temperature and humidity, which changes, there will not be too big change. In circuit diagram, what MCU was represented is the chip that single-chip microcomputer and analog-digital converter combine, and is an entirety.In this entirety Interior, there is ADC0809, internally can converts to the analog signal being collected into.

As shown in figure 4, in the normal work of sensor, once gas sensing resistance touches the methane in air, and it is therein The resistivity of some materials will change.The concentration of methane is higher, and resistivity will be bigger, so, can cause electricity The resistance increase of resistance, and then the change of voltage can be caused.This series winding lock reactor, may finally draw gas concentration and voltage it Between contact, just draw the analog signal on methane concentration.Want by MQ-5 sensors, directly by the concentration of Methane in Air It is impossible, it is necessary to which conversion is adjusted in third party's instrument that signal, which is transmitted to single-chip microcomputer,.ADC0809 analog-to-digital conversion devices just fill In the presence of such a role, analog signal can be converted into data signal in the presence of it, and so, single-chip microcomputer is with regard to that can receive it simultaneously React.Gas concentration signal has just been come into inside single-chip microcomputer.

Concentration signal can be changed into analog electrical signal, the change of methane concentration by MQ-5 sensors when gathering methane concentration So as to be converted into the change of MQ-5 sensor internal resistances, the change of voltage is reconverted into, then, the concentration signal of methane gas just turns It has been changed to the electric signal of simulation.The electric signal of the simulation passes through LM358, and LM358 is a kind of dual operational amplifier, the telecommunications of simulation Number possible very little, is less susceptible to identify, it is therefore desirable to by it, electric signal further amplified, makes it readily identified, then It is sent in ADC0809, is then converted into data signal, can just be received by single-chip microcomputer, performs the action of next step.

As shown in figure 5, zero cross detection circuit is contained in MOC3041 inside, if the concentration of Methane in Air has exceeded peace Total head, single-chip microcomputer will be acted, single-chip microcomputer will export the signal of a high level, by phase inverter CD4069 it is anti-phase after Produce a low level signal and be sent to optocoupler, MOC3041 is turned on after the zero-crossing, it can use that minimum outward element is carried out Voltage stabilizing, decompression, while bidirectional triode thyristor is triggered, bidirectional triode thyristor turns on, power on circuitry, and at this moment ventilation fan starts, in accelerating chamber Air flow, extraneous fresh air comes in, and interior is reached a lodgeable environment.It is vented by ventilation fan, room Interior methane concentration reduces, and caused analog voltage signal diminishes after sensor collection information, the input of MOC3041 input pins Electric current is 0, and bidirectional thyristor shut-off, down circuitry, ventilation fan does not have power supply power supply, is stopped.

As shown in fig. 6, gas valve circuit is similar to the circuit of ventilation fan, simply ventilation fan is replaced gas valve.Gas valve At work, voltage only only have more than ten volts, both safety and also too many energy will not be consumed, meet very much energy-conservation the present age meaning Know.When single-chip microcomputer receives the exceeded signal of concentration of natural gas, it will control and transmit a direct impulse, such gas valve will Action, close valve and be always maintained at this state, prevent natural gas leaking from further expanding.

As shown in Figure 7, Figure 8, sound, optical alarm circuit are controlled by the P2.3 pins of single-chip microcomputer, when the concentration of tested gas During more than safety value, single-chip microcomputer will be made a response, and pin will put height, and so as to export a high level, PNP type triode is opened Begin to turn on, export a high level, and then cause buzzer and LED lamp circuit conducting, buzzer to send drone alarm, LED flickering can also warn, and this specimen chamber master will realise that there is potential safety hazard interior, carries out safe investigation or leaves Room.

After the carbon dioxide in air or concentration of natural gas value exceed normal scope, single-chip microcomputer can immediately make anti- Should, controlled accordingly.Buzzer 80 is drummed, and LED 90 is glistened, pair it has been proposed that warning, while opens exhaust Fan 60, the gas of interior is discharged, extraneous fresh air enters room, so as to ensure that the air ambient of interior is adapted to live. Leakage for natural gas, it can also start gas valve 70 immediately, timely close valve.By entering to the air ambient of interior Row detection early warning in real time, to ensure the health of resident.

Finally it should be noted that：Preferred embodiment of the present utility model is the foregoing is only, is not limited to this Utility model, although the utility model is described in detail with reference to the foregoing embodiments, for those skilled in the art For, it can still modify to the technical scheme described in foregoing embodiments, or to which part technical characteristic Progress equivalent substitution, all within the spirit and principles of the utility model, any modification, equivalent substitution and improvements made etc., It should be included within the scope of protection of the utility model.

Claims

A kind of 1. Indoor Environment Detection early warning system, it is characterised in that：The early warning system includes sensor element, microcontroller （40）And execution unit；

The sensor element includes carbon dioxide sensor（10）And sensor of natural gas（20）, the execution unit is including arranging Gas is fanned（60）And gas valve（70）；

The carbon dioxide sensor（10）And sensor of natural gas（20）Pass through analog-digital converter respectively（30）With microcontroller （40）Input be connected, the microcontroller（40）Output end by connecting automatic control circuit（50）Respectively with exhaust fan （60）And gas valve（70）It is connected, by carbon dioxide sensor（10）And sensor of natural gas（20）Detection realize control Exhaust fan（60）And gas valve（70）Start and stop；

Also include alarm module（100）, the alarm module（100）With microcontroller（40）It is connected, works as microcontroller（40）Connect By carbon dioxide sensor（10）Or sensor of natural gas（20）When the value of detection exceedes preset value, alarm module（100）Hair Go out alarm signal.
A kind of 2. Indoor Environment Detection early warning system according to claim 1, it is characterised in that：The alarm module （100）Including buzzer（80）And LED（90）, the buzzer（80）And LED（90）Respectively with microcontroller（40）Phase Even.
A kind of 3. Indoor Environment Detection early warning system according to claim 1, it is characterised in that：The carbon dioxide sensing Device（10）Using MG811 sensors.
A kind of 4. Indoor Environment Detection early warning system according to claim 1, it is characterised in that：The sensor of natural gas （20）Using MQ-5 sensors.
A kind of 5. Indoor Environment Detection early warning system according to claim 1, it is characterised in that：The automatic control circuit （50）Including bidirectional triode thyristor type photoelectric coupling circuit MOC3041, phase inverter CD4069 and bidirectional triode thyristor；

The microcontroller（40）Output end electrically connected with phase inverter CD4069 input, the phase inverter CD4069's is defeated Go out end to electrically connect with bidirectional triode thyristor type photoelectric coupling circuit MOC3041 input, the bidirectional triode thyristor type photoelectric coupling circuit MOC3041 output end electrically connects with bidirectional triode thyristor.
A kind of 6. Indoor Environment Detection early warning system according to claim 1, it is characterised in that：The microcontroller（40） Using STC89C52 single chip.
A kind of 7. Indoor Environment Detection early warning system according to claim 1, it is characterised in that：The analog-digital converter （30）Using ADC0809 converters.