CN104112328A - Automatic fire alarm system - Google Patents
Automatic fire alarm system Download PDFInfo
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- CN104112328A CN104112328A CN201410337564.4A CN201410337564A CN104112328A CN 104112328 A CN104112328 A CN 104112328A CN 201410337564 A CN201410337564 A CN 201410337564A CN 104112328 A CN104112328 A CN 104112328A
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- automatic fire
- fire alarm
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Abstract
An automatic fire alarm system comprises a temperature sensor, a gas sensor, an operational amplifier circuit, an A/D (Analog to Digital) conversion module, a single chip microcomputer, a key module, a display module, an alarm module and a state indicating lamp; the temperature sensor and the gas sensor are connected with the operational amplifier circuit; the A/D conversion module is connected with the operational amplifier circuit and the single chip microcomputer; the single chip microcomputer is also connected with the key module, the display module, the alarm module and the state indicating lamp; a ground terminal of the temperature sensor and a ground terminal of the gas sensor are connected with a resistor R in series respectively. The automatic fire alarm system has the advantages of being low in cost, simple and practical, low in false alarm rate, ultra-low in power consumption, convenient and reliable and the like.
Description
Technical field
The present invention relates to a kind of warning system, relate in particular to a kind of automatic fire alarm system.
Background technology
Since reform and opening-up, country enters fast-developing construction period, economy obtain fast-developing in, also often can hear or see because safety practice is not in place, or artificial negligence causes big fire, cause property and personnel's heavy losses.Especially society, high building stands in great numbers, and urban population density is large, once breaking out of fire will cause consequence difficult to the appraisal.
At present, because of reasons such as economic profit, the market demands, domestic manufacturer is directed to the research and development that bulk storage plant, market, senior office building, hotels and other places are done large-sized fire warning system mostly, and they adopt concentrated area controlling alarm mode, and its system complex, cost are higher.Research and development at the fire alarm system of the small fireproof units such as residential neighborhoods, machine room, office are less, and along with expanding economy, the research and development of this type of small-sized fire alarm system are necessary.Existing small-sized fire alarm system, can not early detection fire, and due to the fault of sensor, rate of false alarm is high.
Summary of the invention
For solving prior art above shortcomings, the invention provides a kind of automatic fire alarm system, the advantage such as that this system has is cheap, simple and practical, rate of false alarm is extremely low, convenient and reliable.
For achieving the above object, technical scheme of the present invention is as follows:
Automatic fire alarm system, comprising: temperature sensor, gas sensor, operational amplification circuit, A/D modular converter, single-chip microcomputer, key-press module, display module, alarm module and status indicator lamp; Described temperature sensor is connected with operational amplification circuit with gas sensor, and A/D modular converter is connected with single-chip microcomputer with operational amplification circuit respectively, and single-chip microcomputer is also connected with key-press module, display module, alarm module and status indicator lamp; The earth terminal resistance in series of described temperature sensor and gas sensor;
Further, described temperature sensor is a plurality of;
Further, described temperature sensor is AD590, for collecting temperature data;
Further, described gas sensor is a plurality of;
Further, described gas sensor is TGS202, for gathering gas concentration data;
Further, described A/D modular converter is ADC0809, for the simulating signal of input is converted to digital signal;
Further, described single-chip microcomputer is AT89S52;
Further, described display module is LCD1602, for showing floor and the room number of breaking out of fire;
Further, described alarm module is passive piezoelectric type KM3712x type hummer
Beneficial effect of the present invention: this system have cheap, simple and practical, rate of false alarm is extremely low, super low-power consumption, the advantage such as convenient and reliable, and can find early Local Fire hidden danger, report to the police early.
Accompanying drawing explanation
The present invention has accompanying drawing 4 width.
Fig. 1 is the structured flowchart of native system;
Fig. 2 operational amplification circuit;
Fig. 3 is A/D change-over circuit;
Fig. 4 is alarm module circuit diagram.
Embodiment
Below by embodiment, and by reference to the accompanying drawings, technical scheme of the present invention is described in further detail.
Automatic fire alarm system, comprising: temperature sensor, gas sensor, operational amplification circuit, A/D modular converter, single-chip microcomputer, key-press module, display module, alarm module and status indicator lamp; Described temperature sensor is connected with operational amplification circuit with gas sensor, and A/D modular converter is connected with single-chip microcomputer with operational amplification circuit respectively, and single-chip microcomputer is also connected with key-press module, display module, alarm module and status indicator lamp;
The promising AD590 of described temperature sensor, and have a plurality of, for collecting temperature data, the advantage such as this integrated temperature sensor has good linearity, highly sensitive, volume is little, easy to use; Described gas sensor is TGS202, and have a plurality of, for gathering gas concentration data; In fire, gas fume is mainly CO2 and CO, and TGS202 gas sensor can be surveyed the multiple gases such as CO2, CO, methane, coal gas, highly sensitive, good stability; Earth terminal resistance in series R at temperature sensor and gas sensor, single-chip microcomputer detects resistance two ends by P2.1 pin faint voltage: if the power supply of temperature sensor and gas sensor is connected extremely, can produce and open circuit, it is 0 that single-chip microcomputer P2.1 pin detects resistance both end voltage, and now alarm module sends warning;
Operational amplification circuit amplifies the outputting analog signal of temperature sensor and gas sensor, to meet the requirement of A/D converter to input analog amount amplitude and polarity.The signal that temperature sensor and gas sensor collection come converts faint electric signal to, and this electric signal is sent LM324A to from input end and amplified processing, obtains stronger analog electrical signal, then exports A/D modular converter to from output terminal.Because simulating signal cannot directly be identified by single-chip microcomputer, so change simulating signal being carried out to A/D dress after amplifying circuit, simulating signal is converted into digital signal input single-chip microcomputer.
Its channel selecting address is provided through address latch 74ls373 output by P0.0～P0.2 of AT89S52, when P2.7=0, with the common gating ADC0809 of write signal WR.Wherein 1～5 and 26～28 (IN0～IN7) pin is 8 road analog input ends, and 8,14,15 and 17～21 pins are 8 bit digital quantity output terminals.In the forward position of WR signal, ale signal is writing address signal together with ST signal, then starts conversion.ADC0809 status signal EOC receives the INT1 pin of AT89S52, and when A/D converts, EOC becomes high level, and EOC produces and interrupts.In interrupt service routine, the data of having changed are delivered to the storage unit of appointment above.Due in ADC0809 sheet without clock, can utilize the address latch enable signal ALE that single-chip microcomputer provides to obtain clock after d type flip flop two divided-frequency.Because the frequency of ale signal is 1/6 of Singlechip clock frequency, concrete methods of realizing is: if clock frequency is 6MHZ, the frequency of ale signal is 1MHZ, is 500KHZ after two divided-frequency, matches with the representative value of ADC0809.As shown in Figure 3:
Described single-chip microcomputer is AT89S52, for processing and the judgement to temperature data and gas concentration data;
Further, display module is LCD1602, for showing floor and the room number of breaking out of fire;
Described alarm module adopts a high frequency small-signal transistor ZTX325, passive piezoelectric type KM3712x type hummer and corresponding resistance etc. to form audible alarm system, and alarm module circuit diagram as shown in Figure 4.When 28 pin of single chip computer AT 89S52 put 1, triode Q5 conducting, buzzer warning.This alarm adopts the PWM function of single chip computer AT 89S52, if smokescope reaches alarm limit, and the pulse that Single-chip Controlling mouth output duty cycle is certain, thus to report to the police, hummer can send as the sound of police car siren.
The workflow of this system is: first temperature sensor and gas sensor preheating can gather smog and temperature information in three minutes.In the time of preheating, detected temperatures sensor and gas sensor heater strip fault, i.e. whether loose contact or broken string of detecting sensor heater strip or cable, if any bad, alarm module now gives the alarm;
After program initialization finishes, system enters monitor state, key-press module is set two threshold value S1 and S2, temperature sensor and gas sensor pass through operational amplification circuit by the data of collection, send to A/D modular converter, A/D modular converter is converted into digital signal by simulating signal, transfer data to single-chip microcomputer, single-chip microcomputer is after mean value method filtering, linearization process, detected value is compared with two threshold value S1 and S2 respectively, as exceed S1 or S2 or exceed S1 and S2 simultaneously, alarm module sends warning;
Native system also comprises status indicator lamp, and the bright expression system of blue lamp is normally moved, without fire hazard; There is broken string or loose contact in the bright expression temperature sensor of amber light or gas sensor heater strip; When red represents in environment that smokescope or temperature surpass warning limit value, may exist fire.
Claims (9)
1. automatic fire alarm system, is characterized in that, comprising: temperature sensor, gas sensor, operational amplification circuit, A/D modular converter, single-chip microcomputer, key-press module, display module, alarm module and status indicator lamp; Described temperature sensor is connected with operational amplification circuit with gas sensor, and A/D modular converter is connected with single-chip microcomputer with operational amplification circuit respectively, and single-chip microcomputer is also connected with key-press module, display module, alarm module and status indicator lamp; The earth terminal resistance in series of described temperature sensor and gas sensor.
2. automatic fire alarm system according to claim 1, is characterized in that, described temperature sensor is a plurality of.
3. automatic fire alarm system according to claim 2, is characterized in that, described temperature sensor is AD590, for collecting temperature data.
4. automatic fire alarm system according to claim 1, is characterized in that, described gas sensor is a plurality of.
5. automatic fire alarm system according to claim 4, is characterized in that, described gas sensor is TGS202, for gathering gas concentration data.
6. automatic fire alarm system according to claim 1, is characterized in that, described A/D modular converter is ADC0809, for the simulating signal of input is converted to digital signal.
7. automatic fire alarm system according to claim 1, is characterized in that, described single-chip microcomputer is AT89S52.
8. automatic fire alarm system according to claim 1, is characterized in that, described display module is LCD1602, for showing floor and the room number of breaking out of fire.
9. automatic fire alarm system according to claim 1, is characterized in that, described alarm module is passive piezoelectric type KM3712x type hummer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410337564.4A CN104112328A (en) | 2014-07-15 | 2014-07-15 | Automatic fire alarm system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410337564.4A CN104112328A (en) | 2014-07-15 | 2014-07-15 | Automatic fire alarm system |
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| CN104112328A true CN104112328A (en) | 2014-10-22 |
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| CN201410337564.4A Pending CN104112328A (en) | 2014-07-15 | 2014-07-15 | Automatic fire alarm system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106504463A (en) * | 2016-11-30 | 2017-03-15 | 深圳市泛海三江电子股份有限公司 | A kind of low-voltage stand alone type photoelectric smoke detecting alarm |
| CN107170177A (en) * | 2017-07-07 | 2017-09-15 | 芜湖职业技术学院 | Campus intelligent fire alarm system |
| CN109308786A (en) * | 2018-11-27 | 2019-02-05 | 南京铁道职业技术学院 | A kind of Source of Railway Communication and Signalling computer room fire alarm fire extinguishing system |
| CN109540334A (en) * | 2018-12-19 | 2019-03-29 | 河北涿州京源热电有限责任公司 | The method for early warning of generator overheating potential faults based on three-dimensional display |
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| GB2391069A (en) * | 2002-07-20 | 2004-01-28 | William Marshall | Building temperature monitor providing an output dependent on detected temperature |
| CN203134061U (en) * | 2012-12-25 | 2013-08-14 | 长安大学 | Automobile fire alarm system based on single chip microcomputer |
| CN103646489A (en) * | 2013-11-18 | 2014-03-19 | 成都捷康特科技有限公司 | Fire hazard alarm device |
| CN103745552A (en) * | 2013-12-25 | 2014-04-23 | 广西科技大学 | Automatic fire alarm system |
| CN103839361A (en) * | 2012-11-26 | 2014-06-04 | 西安奥赛福科技有限公司 | Wireless fire detector |
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2014
- 2014-07-15 CN CN201410337564.4A patent/CN104112328A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2391069A (en) * | 2002-07-20 | 2004-01-28 | William Marshall | Building temperature monitor providing an output dependent on detected temperature |
| CN103839361A (en) * | 2012-11-26 | 2014-06-04 | 西安奥赛福科技有限公司 | Wireless fire detector |
| CN203134061U (en) * | 2012-12-25 | 2013-08-14 | 长安大学 | Automobile fire alarm system based on single chip microcomputer |
| CN103646489A (en) * | 2013-11-18 | 2014-03-19 | 成都捷康特科技有限公司 | Fire hazard alarm device |
| CN103745552A (en) * | 2013-12-25 | 2014-04-23 | 广西科技大学 | Automatic fire alarm system |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106504463A (en) * | 2016-11-30 | 2017-03-15 | 深圳市泛海三江电子股份有限公司 | A kind of low-voltage stand alone type photoelectric smoke detecting alarm |
| CN107170177A (en) * | 2017-07-07 | 2017-09-15 | 芜湖职业技术学院 | Campus intelligent fire alarm system |
| CN109308786A (en) * | 2018-11-27 | 2019-02-05 | 南京铁道职业技术学院 | A kind of Source of Railway Communication and Signalling computer room fire alarm fire extinguishing system |
| CN109540334A (en) * | 2018-12-19 | 2019-03-29 | 河北涿州京源热电有限责任公司 | The method for early warning of generator overheating potential faults based on three-dimensional display |
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Application publication date: 20141022 |