CN205050306U - Gaseous detection alarm circuit - Google Patents
Gaseous detection alarm circuit Download PDFInfo
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- CN205050306U CN205050306U CN201520697943.4U CN201520697943U CN205050306U CN 205050306 U CN205050306 U CN 205050306U CN 201520697943 U CN201520697943 U CN 201520697943U CN 205050306 U CN205050306 U CN 205050306U
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- 238000001514 detection method Methods 0.000 title claims abstract description 26
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 198
- 239000001301 oxygen Substances 0.000 claims abstract description 68
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 68
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 67
- 239000007789 gas Substances 0.000 claims abstract description 23
- 238000012360 testing method Methods 0.000 claims description 63
- 239000013078 crystal Substances 0.000 claims description 30
- 238000007688 edging Methods 0.000 claims description 6
- 238000013461 design Methods 0.000 abstract description 7
- 238000010892 electric spark Methods 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 6
- 238000001914 filtration Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 206010023126 Jaundice Diseases 0.000 description 1
- 101100434411 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) ADH1 gene Proteins 0.000 description 1
- 101150102866 adc1 gene Proteins 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 235000019994 cava Nutrition 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 210000003205 muscle Anatomy 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
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Abstract
The utility model relates to a gaseous detection alarm circuit belongs to detecting instrument technical field. The utility model discloses a single -chip control circuit, acousto -optic warning circuit, methane concentration detection circuit, oxygen concentration detection circuit, wherein single -chip control circuit links to each other with acousto -optic warning circuit, methane concentration detection circuit, oxygen concentration detection circuit respectively. The utility model discloses do not need to design alone again AD converting circuit, the circuit structure is simplified, and saves manufacturing cost, the characteristics that have convenient to carry simultaneously, the design has oxygen and methane gas concentration detection circuit, avoided carrying two kinds of equipment simultaneously and cause physical power consumption, two kinds of audible alarm modes have been designed, avoid the emergence of the circumstances that independent voice broadcast does not hear in the complex environment, the practicality of this circuit has been strengthened, whole circuit is worked under the low voltage circumstances, can not produce the electric spark, the security in personnel's use has been guaranteed.
Description
Technical field
The utility model relates to a kind of gas detection alarm circuit, belongs to detecting instrument technical field.
Background technology
A mountainous-outdoor sports is not only in pothole, and is scientific activities.Pothole is abroad, especially in developed country's development comparatively early, also comparatively universal, emerges large quantities of outstanding pothole fan.These explorers attract by the Cave Resources of China's abundant, come China one after another, and this activity brought into the gateway of a country.Along with the progress of modern science and technology, this activity has developed into collection amusement, take exercise, risk, visit, knowledge comprehensive outdoor exercises, due to cave be isolated from the outside for a long time, uninhabited, air may be there is do not circulate with the external world, very easily there is the problem of anoxic, cause casualties, in order to prevent anoxic accident, current pothole fan generally adopts lighted candle, the content of oxygen is judged by candle flare, when oxygen abundance, candle combustion is normal, the anoxic initial stage, candle flare starts jaundice, according to the different situations of cavernous interior mixed gas, extremely even extinguishing appears in candle flare, but gas composition is complicated in many caves, in addition to oxygen gas, what have also has the inflammable gass such as methane, once inflammable gas content exceedes certain value, and now pothole fan lighted candle, methane gas can be made to burn rapidly, cause the rapid compression-expansion of air, form big bang, the life safety of serious harm pothole fan, if and carry oxygen and methane concentration checkout equipment simultaneously, because volume and weight is larger, overstaffed muscle power can be consumed, therefore design a kind of gas detection alarm circuit that simultaneously can detect oxygen and concentration of methane gas to have very important significance.
Summary of the invention
The purpose of this utility model is to provide a kind of gas detection alarm circuit, for overcome traditional detection oxygen concentration method easily because Methane in Air concentration cause too much blast and existing gas detection equipment volume and weight larger, carry inconvenience, and detect the single shortcoming of gaseous species.
The technical solution of the utility model is: a kind of gas detection alarm circuit, comprises single chip machine controlling circuit 1, sound light alarming circuit 2, methane concentration testing circuit 3, oxygen concentration testing circuit 4; Wherein single chip machine controlling circuit 1 is connected with sound light alarming circuit 2, methane concentration testing circuit 3, oxygen concentration testing circuit 4 respectively.
Described single chip machine controlling circuit 1 comprises single-chip microcomputer U2, crystal oscillator XT1, electric capacity C11, electric capacity C12, electric capacity C13, switch S 1, resistance R24, resistance R26; Wherein the VCC end of single-chip microcomputer U2 and AVCC end and direct supply VCC hold and are electrically connected, the GND end of single-chip microcomputer U2 is connected to ground, crystal oscillator XT1 is connected in parallel on XTAL1 and the XTAL2 two ends of single-chip microcomputer U2, crystal oscillator XT1 two ends are connected to ground respectively by electric capacity C12, electric capacity C13, resistance R24 one end and direct supply VCC hold and are electrically connected, the resistance R24 other end is connected with electric capacity C13 positive pole with switch S 1, switch S 1 other end and electric capacity C13 negative pole are held with the RESET of single-chip microcomputer U2 and are connected with resistance R26 one end, and the R26 other end is connected to ground.
Described sound light alarming circuit 2 comprises resistance R3, resistance R4, resistance R5, resistance R6, resistance R7, resistance R8, resistance R9, resistance R15, resistance R19, resistance R20, light emitting diode D1, light emitting diode D2, electric capacity C1, electric capacity C2, electric capacity C5, electric capacity C6, triode Q1, loudspeaker LS1, hummer LS2, voice recording and playback ic U1, wherein resistance R3, resistance R4, electric capacity C1, resistance R5, resistance R6, resistance R7, resistance R8, resistance R9 one end and direct supply VCC hold and are electrically connected, resistance R3 is connected with light emitting diode D1 positive pole, light emitting diode D1 negative pole is connected with the I/O port of single-chip microcomputer U2, resistance R4 is connected with light emitting diode D2 positive pole, light emitting diode D2 negative pole is connected with the light emitting diode interface port of voice recording and playback ic U1, electric capacity C1 and resistance R5 and voice recording and playback ic U1 port of recording is connected, resistance R6 is connected with voice recording and playback ic U1 edging trigger playback port, resistance R7 is connected with voice recording and playback ic U1 level triggers playback port, resistance R8 and resistance R9 are connected with voice recording and playback ic U1 address port respectively, voice recording and playback ic U1 remaining address port and the external timer port of voice recording and playback ic U1 are connected to ground, electric capacity C2 one end is held with direct supply VCC and VCCD and the VCCA port of voice recording and playback ic U1 is connected, the electric capacity C2 other end is connected with VSSD and the VSSA port of voice recording and playback ic U1, loudspeaker LS1 two ends are connected with voice recording and playback ic U1 speaker output port positive and negative terminal respectively, resistance R15 one end is connected with the analog input port of voice recording and playback ic U1, the resistance R15 other end is connected with electric capacity C5 one end, the electric capacity C5 other end is connected with voice recording and playback ic U1 modulating output port, resistance R19 one end, electric capacity C6 positive pole is connected with voice recording and playback ic U1 automatic growth control port, the resistance R19 other end and electric capacity C6 negative pole are connected to ground, hummer LS2 one end is held with direct supply VCC and is connected, the hummer LS2 other end is connected with triode Q1 collector, triode Q1 emitter is connected to ground, triode Q1 base stage is connected with resistance R20 one end, the resistance R20 other end is connected with the I/O port of single-chip microcomputer U2.
Described methane concentration testing circuit 3 comprises methane transducer MJC1, methane transducer MJC2, resistance R1, resistance R2, resistance R10, resistance R12, resistance R13, resistance R14, resistance R16, resistance R17, resistance R18, potentiometer R11, electric capacity C3, electric capacity C4, operational amplifier A R1, operational amplifier A R2, operational amplifier A R3, wherein operational amplifier A R1, operational amplifier A R2, operational amplifier A R3 power supply positive-negative input end is held with direct supply VCC respectively and ground is connected, methane transducer MJC1, potentiometer R11 holds with direct supply VCC and is connected, the potentiometer R11 other end is connected with resistance R17 one end and operational amplifier A R1 normal phase input end, the methane transducer MJC1 other end is connected with methane transducer MJC2 one end and operational amplifier A R3 normal phase input end, methane transducer MJC2 and resistance R17 is connected to ground, operational amplifier A R1 negative-phase input is connected with operational amplifier A R1 output terminal, operational amplifier A R3 negative-phase input is connected with operational amplifier A R3 output terminal, operational amplifier A R1 output terminal is connected with resistance R12 one end, the resistance R12 other end is connected with resistance R1 one end and operational amplifier A R2 negative-phase input, the resistance R1 other end is connected with resistance R2 and resistance R16, the resistance R2 other end is connected with operational amplifier A R2 output terminal, operational amplifier A R3 output terminal is connected with resistance R14 one end, the resistance R14 other end is connected with resistance R10 one end and operational amplifier A R2 normal phase input end, the resistance R10 other end is connected with the resistance R16 other end and resistance R18 one end respectively, resistance R18 is connected to ground, resistance R13 one end is connected with operational amplifier A R2 output terminal, the resistance R13 other end is connected with the ADC port of electric capacity C3 one end and electric capacity C4 one end and single-chip microcomputer U2, electric capacity C3 and the electric capacity C4 other end are connected to ground.
Described oxygen concentration testing circuit 4 comprises oxygen sensor OS1, resistance R21, resistance R22, resistance R25, potentiometer R23, electric capacity C7, electric capacity C8, electric capacity C9, electric capacity C10, operational amplifier A R4, wherein operational amplifier A R4 power supply positive-negative input end is held with direct supply VCC respectively and is connected with ground, oxygen sensor OS1 two ends are connected with electric capacity C7 two ends respectively, electric capacity C7 one end is connected with resistance R22 one end, the resistance R22 other end is connected with potentiometer R23 one end, the potentiometer R23 other end is connected with resistance R21 one end and operational amplifier A R4 negative-phase input, the resistance R21 other end is connected with operational amplifier A R4 output terminal, electric capacity C9 is connected with operational amplifier A R4 output terminal with electric capacity C8 negative pole respectively with electric capacity C10 one end, electric capacity C9 is connected with the ADC port of ground and single-chip microcomputer U2 with electric capacity C8 positive pole respectively with the electric capacity C10 other end, the electric capacity C7 other end is connected with ground and resistance R25 one end, the resistance R25 other end is connected with operational amplifier A R4 normal phase input end.
Principle of work of the present utility model is:
After circuit powers on, whole circuit is started working, by methane transducer MJC1, methane transducer MJC2, potentiometer R11, the Wheatstone bridge that resistance R17 forms converts methane concentration to voltage signal and exports, at methane concentration be zero environment in, methane transducer MJC1, the resistance of methane transducer MJC2 all changes along with the change of temperature, and now electric bridge is in equilibrium state, and output voltage signal is zero, when the methane concentration in air is non-vanishing, due to methane transducer MJC1, the otherness to methane concentration detection sensitivity of methane transducer MJC2, methane transducer MJC1, methane transducer MJC2 resistance variations is different, electric bridge out of trim, now the size of bridge output voltage and methane concentration proportional, the feeble signal that electric bridge exports is sent into by operational amplifier A R2 through the voltage follower be made up of respectively operational amplifier A R1 and operational amplifier A R3, resistance R1, resistance R2, resistance R10, resistance R12, resistance R13, resistance R14, resistance R16, the differential amplifier circuit that resistance R18 is formed, improve the input impedance of signal processing circuit, inhibit common-mode signal, further difference mode signal is enlarged into 0-5V signal by resistance R13, and after electric capacity C3 and electric capacity C4 carries out filtering to high-frequency interferencing signal, sends into the AD converter entrance ADC0 port of single-chip microcomputer U2.
Oxygen sensor OS1 is in the environment of zero in oxygen concentration, the voltage signal exported is zero, as oxygen sensor OS1 in oxygen concentration not for in the environment of zero, oxygen sensor OS1 output voltage signal is non-vanishing, and send into by operational amplifier A R4 after filtering being carried out to high-frequency interferencing signal by electric capacity C7, resistance R21, resistance R22, potentiometer R23, the reverse scaling circuit that resistance R25 forms carries out amplification to voltage signal and exports, output signal is through electric capacity C8, electric capacity C9, the AD converter entrance ADC1 port of single-chip microcomputer U2 is sent into after the filtering circuit that electric capacity C10 forms carries out filtering to high-frequency interferencing signal.
The light emitting diode interface port sending and receiving optical diode D2 of voice recording and playback ic U1, and meet direct supply VCC by resistance R4 and hold, light emitting diode D2 is luminous, U1 is in running order for instruction voice recording and playback ic, when oxygen or methane concentration exceed dangerous values, it is too low that single-chip microcomputer U2 exports corresponding oxygen concentration by its I/O port, methane concentration is too high, too low and the different control signal that methane concentration is too low of oxygen concentration, wherein the corresponding oxygen concentration of PD0 end output of single-chip microcomputer U2 is too low, methane concentration is too high, too low and the different duty pulse signal that methane concentration is too low of oxygen concentration controls the shutoff of triode Q1, hummer LS2 is made to send the sound of different frequency, the corresponding oxygen concentration of PB5 end output of single-chip microcomputer U2 is too low simultaneously, methane concentration is too high, too low and the different duty pulse signal that methane concentration is too low of oxygen concentration controls the shutoff of light emitting diode D1, light emitting diode D1 is glimmered with different frequency, the PB0 of single-chip microcomputer U2 simultaneously, PB1, PB2, PB3, it is too low that PB4 end exports corresponding oxygen concentration, methane concentration is too high, too low and methane concentration the is too low different level signal of oxygen concentration control voice recording and playback ic U1 by itself SP+ and SP-port connect loudspeaker and send different voice broadcasts.
Described single-chip microcomputer is connected with methane concentration testing circuit by I/O port, and read the methane concentration information that detects and it is processed, be routine techniques, as in Li Nailu, Xu Zhibin " design of a JCB4A Portable Methane Detection Alarm " literary composition, describe the mode of operation that methane concentration testing circuit is connected with single-chip processor i/o interface, and give and to be connected with single-chip microcomputer and to carry out the example of data processing.
Described single-chip microcomputer is connected with oxygen concentration testing circuit by I/O port, and read the oxygen concentration information that detects and it is processed, be routine techniques, as in Liang Xiangfeng, Chen Xu, Sun Changku " design of an oxygen level sensor supervisory circuit " literary composition, describe the mode of operation that oxygen concentration testing circuit is connected with single-chip processor i/o interface, and give and to be connected with single-chip microcomputer and to carry out the example of data processing.
Described single-chip microcomputer is connected with voice recording and playback ic by I/O port, and play different phonetic signal, be routine techniques, as in Jiang Huaiwei, Yin Zhiqiang " application of ISD1420 speech chip in a Single Chip Microcomputer (SCM) system " literary composition, describe the principle of work of ISD1420 speech chip, and give the example with single-chip microcomputer connecting circuit.
It is routine techniques that described single-chip microcomputer exports different duty cycle pulse signal by I/O port, as in He Qiyuan, Zhang Zunquan, Gan Chuanfu " a kind of based on a monolithic processor controlled multifunctional universal signal source " literary composition, describe a kind of based on Single-chip Controlling, the design concept of the adjustable signal of multiple dutycycle can be produced, and give the example of corresponding hardware configuration and program.
The beneficial effects of the utility model are:
By adopting the single-chip microcomputer carrying ADC port, when ensureing system requirements, do not need to design separately A/D change-over circuit again, simplify circuit structure, save manufacturing cost, there is feature easy to carry simultaneously, be designed with oxygen and concentration of methane gas testing circuit, avoid and carry two kinds of equipment simultaneously and cause physical consumption, devise two kinds of audible alarm modes, avoid the generation of independent voice broadcast undistinguished situation in complex environment, enhance the practicality of this circuit, whole circuit works in low voltage situation, electric spark can not be produced, ensure that the security in librarian use process.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present utility model;
Each label in figure: 1-single chip machine controlling circuit, 2-sound light alarming circuit, 3-methane concentration testing circuit, 4-oxygen concentration testing circuit.
Embodiment
Embodiment 1: as shown in Figure 1, a kind of gas detection alarm circuit, comprises single chip machine controlling circuit 1, sound light alarming circuit 2, methane concentration testing circuit 3, oxygen concentration testing circuit 4; Wherein single chip machine controlling circuit 1 is connected with sound light alarming circuit 2, methane concentration testing circuit 3, oxygen concentration testing circuit 4 respectively.
Described single chip machine controlling circuit 1 comprises single-chip microcomputer U2, crystal oscillator XT1, electric capacity C11, electric capacity C12, electric capacity C13, switch S 1, resistance R24, resistance R26; Wherein the VCC end of single-chip microcomputer U2 and AVCC end and direct supply VCC hold and are electrically connected, the GND end of single-chip microcomputer U2 is connected to ground, crystal oscillator XT1 is connected in parallel on XTAL1 and the XTAL2 two ends of single-chip microcomputer U2, crystal oscillator XT1 two ends are connected to ground respectively by electric capacity C12, electric capacity C13, resistance R24 one end and direct supply VCC hold and are electrically connected, the resistance R24 other end is connected with electric capacity C13 positive pole with switch S 1, switch S 1 other end and electric capacity C13 negative pole are held with the RESET of single-chip microcomputer U2 and are connected with resistance R26 one end, and the R26 other end is connected to ground.
Described sound light alarming circuit 2 comprises resistance R3, resistance R4, resistance R5, resistance R6, resistance R7, resistance R8, resistance R9, resistance R15, resistance R19, resistance R20, light emitting diode D1, light emitting diode D2, electric capacity C1, electric capacity C2, electric capacity C5, electric capacity C6, triode Q1, loudspeaker LS1, hummer LS2, voice recording and playback ic U1, wherein resistance R3, resistance R4, electric capacity C1, resistance R5, resistance R6, resistance R7, resistance R8, resistance R9 one end and direct supply VCC hold and are electrically connected, resistance R3 is connected with light emitting diode D1 positive pole, light emitting diode D1 negative pole is connected with the I/O port of single-chip microcomputer U2, resistance R4 is connected with light emitting diode D2 positive pole, light emitting diode D2 negative pole is connected with the light emitting diode interface port of voice recording and playback ic U1, electric capacity C1 and resistance R5 and voice recording and playback ic U1 port of recording is connected, resistance R6 is connected with voice recording and playback ic U1 edging trigger playback port, resistance R7 is connected with voice recording and playback ic U1 level triggers playback port, resistance R8 and resistance R9 are connected with voice recording and playback ic U1 address port respectively, voice recording and playback ic U1 remaining address port and the external timer port of voice recording and playback ic U1 are connected to ground, electric capacity C2 one end is held with direct supply VCC and VCCD and the VCCA port of voice recording and playback ic U1 is connected, the electric capacity C2 other end is connected with VSSD and the VSSA port of voice recording and playback ic U1, loudspeaker LS1 two ends are connected with voice recording and playback ic U1 speaker output port positive and negative terminal respectively, resistance R15 one end is connected with the analog input port of voice recording and playback ic U1, the resistance R15 other end is connected with electric capacity C5 one end, the electric capacity C5 other end is connected with voice recording and playback ic U1 modulating output port, resistance R19 one end, electric capacity C6 positive pole is connected with voice recording and playback ic U1 automatic growth control port, the resistance R19 other end and electric capacity C6 negative pole are connected to ground, hummer LS2 one end is held with direct supply VCC and is connected, the hummer LS2 other end is connected with triode Q1 collector, triode Q1 emitter is connected to ground, triode Q1 base stage is connected with resistance R20 one end, the resistance R20 other end is connected with the I/O port of single-chip microcomputer U2.
Described methane concentration testing circuit 3 comprises methane transducer MJC1, methane transducer MJC2, resistance R1, resistance R2, resistance R10, resistance R12, resistance R13, resistance R14, resistance R16, resistance R17, resistance R18, potentiometer R11, electric capacity C3, electric capacity C4, operational amplifier A R1, operational amplifier A R2, operational amplifier A R3, wherein operational amplifier A R1, operational amplifier A R2, operational amplifier A R3 power supply positive-negative input end is held with direct supply VCC respectively and ground is connected, methane transducer MJC1, potentiometer R11 holds with direct supply VCC and is connected, the potentiometer R11 other end is connected with resistance R17 one end and operational amplifier A R1 normal phase input end, the methane transducer MJC1 other end is connected with methane transducer MJC2 one end and operational amplifier A R3 normal phase input end, methane transducer MJC2 and resistance R17 is connected to ground, operational amplifier A R1 negative-phase input is connected with operational amplifier A R1 output terminal, operational amplifier A R3 negative-phase input is connected with operational amplifier A R3 output terminal, operational amplifier A R1 output terminal is connected with resistance R12 one end, the resistance R12 other end is connected with resistance R1 one end and operational amplifier A R2 negative-phase input, the resistance R1 other end is connected with resistance R2 and resistance R16, the resistance R2 other end is connected with operational amplifier A R2 output terminal, operational amplifier A R3 output terminal is connected with resistance R14 one end, the resistance R14 other end is connected with resistance R10 one end and operational amplifier A R2 normal phase input end, the resistance R10 other end is connected with the resistance R16 other end and resistance R18 one end respectively, resistance R18 is connected to ground, resistance R13 one end is connected with operational amplifier A R2 output terminal, the resistance R13 other end is connected with the ADC port of electric capacity C3 one end and electric capacity C4 one end and single-chip microcomputer U2, electric capacity C3 and the electric capacity C4 other end are connected to ground.
Described oxygen concentration testing circuit 4 comprises oxygen sensor OS1, resistance R21, resistance R22, resistance R25, potentiometer R23, electric capacity C7, electric capacity C8, electric capacity C9, electric capacity C10, operational amplifier A R4, wherein operational amplifier A R4 power supply positive-negative input end is held with direct supply VCC respectively and is connected with ground, oxygen sensor OS1 two ends are connected with electric capacity C7 two ends respectively, electric capacity C7 one end is connected with resistance R22 one end, the resistance R22 other end is connected with potentiometer R23 one end, the potentiometer R23 other end is connected with resistance R21 one end and operational amplifier A R4 negative-phase input, the resistance R21 other end is connected with operational amplifier A R4 output terminal, electric capacity C9 is connected with operational amplifier A R4 output terminal with electric capacity C8 negative pole respectively with electric capacity C10 one end, electric capacity C9 is connected with the ADC port of ground and single-chip microcomputer U2 with electric capacity C8 positive pole respectively with the electric capacity C10 other end, the electric capacity C7 other end is connected with ground and resistance R25 one end, the resistance R25 other end is connected with operational amplifier A R4 normal phase input end.
Embodiment 2: as shown in Figure 1, a kind of gas detection alarm circuit, comprises single chip machine controlling circuit 1, sound light alarming circuit 2, methane concentration testing circuit 3, oxygen concentration testing circuit 4; Wherein single chip machine controlling circuit 1 is connected with sound light alarming circuit 2, methane concentration testing circuit 3, oxygen concentration testing circuit 4 respectively.
Described single chip machine controlling circuit 1 comprises single-chip microcomputer U2, crystal oscillator XT1, electric capacity C11, electric capacity C12, electric capacity C13, switch S 1, resistance R24, resistance R26; Wherein the VCC end of single-chip microcomputer U2 and AVCC end and direct supply VCC hold and are electrically connected, the GND end of single-chip microcomputer U2 is connected to ground, crystal oscillator XT1 is connected in parallel on XTAL1 and the XTAL2 two ends of single-chip microcomputer U2, crystal oscillator XT1 two ends are connected to ground respectively by electric capacity C12, electric capacity C13, resistance R24 one end and direct supply VCC hold and are electrically connected, the resistance R24 other end is connected with electric capacity C13 positive pole with switch S 1, switch S 1 other end and electric capacity C13 negative pole are held with the RESET of single-chip microcomputer U2 and are connected with resistance R26 one end, and the R26 other end is connected to ground.
Embodiment 3: as shown in Figure 1, a kind of gas detection alarm circuit, comprises single chip machine controlling circuit 1, sound light alarming circuit 2, methane concentration testing circuit 3, oxygen concentration testing circuit 4; Wherein single chip machine controlling circuit 1 is connected with sound light alarming circuit 2, methane concentration testing circuit 3, oxygen concentration testing circuit 4 respectively.
Described single chip machine controlling circuit 1 comprises single-chip microcomputer U2, crystal oscillator XT1, electric capacity C11, electric capacity C12, electric capacity C13, switch S 1, resistance R24, resistance R26; Wherein the VCC end of single-chip microcomputer U2 and AVCC end and direct supply VCC hold and are electrically connected, the GND end of single-chip microcomputer U2 is connected to ground, crystal oscillator XT1 is connected in parallel on XTAL1 and the XTAL2 two ends of single-chip microcomputer U2, crystal oscillator XT1 two ends are connected to ground respectively by electric capacity C12, electric capacity C13, resistance R24 one end and direct supply VCC hold and are electrically connected, the resistance R24 other end is connected with electric capacity C13 positive pole with switch S 1, switch S 1 other end and electric capacity C13 negative pole are held with the RESET of single-chip microcomputer U2 and are connected with resistance R26 one end, and the R26 other end is connected to ground.
Described sound light alarming circuit 2 comprises resistance R3, resistance R4, resistance R5, resistance R6, resistance R7, resistance R8, resistance R9, resistance R15, resistance R19, resistance R20, light emitting diode D1, light emitting diode D2, electric capacity C1, electric capacity C2, electric capacity C5, electric capacity C6, triode Q1, loudspeaker LS1, hummer LS2, voice recording and playback ic U1, wherein resistance R3, resistance R4, electric capacity C1, resistance R5, resistance R6, resistance R7, resistance R8, resistance R9 one end and direct supply VCC hold and are electrically connected, resistance R3 is connected with light emitting diode D1 positive pole, light emitting diode D1 negative pole is connected with the I/O port of single-chip microcomputer U2, resistance R4 is connected with light emitting diode D2 positive pole, light emitting diode D2 negative pole is connected with the light emitting diode interface port of voice recording and playback ic U1, electric capacity C1 and resistance R5 and voice recording and playback ic U1 port of recording is connected, resistance R6 is connected with voice recording and playback ic U1 edging trigger playback port, resistance R7 is connected with voice recording and playback ic U1 level triggers playback port, resistance R8 and resistance R9 are connected with voice recording and playback ic U1 address port respectively, voice recording and playback ic U1 remaining address port and the external timer port of voice recording and playback ic U1 are connected to ground, electric capacity C2 one end is held with direct supply VCC and VCCD and the VCCA port of voice recording and playback ic U1 is connected, the electric capacity C2 other end is connected with VSSD and the VSSA port of voice recording and playback ic U1, loudspeaker LS1 two ends are connected with voice recording and playback ic U1 speaker output port positive and negative terminal respectively, resistance R15 one end is connected with the analog input port of voice recording and playback ic U1, the resistance R15 other end is connected with electric capacity C5 one end, the electric capacity C5 other end is connected with voice recording and playback ic U1 modulating output port, resistance R19 one end, electric capacity C6 positive pole is connected with voice recording and playback ic U1 automatic growth control port, the resistance R19 other end and electric capacity C6 negative pole are connected to ground, hummer LS2 one end is held with direct supply VCC and is connected, the hummer LS2 other end is connected with triode Q1 collector, triode Q1 emitter is connected to ground, triode Q1 base stage is connected with resistance R20 one end, the resistance R20 other end is connected with the I/O port of single-chip microcomputer U2.
Embodiment 4: as shown in Figure 1, a kind of gas detection alarm circuit, comprises single chip machine controlling circuit 1, sound light alarming circuit 2, methane concentration testing circuit 3, oxygen concentration testing circuit 4; Wherein single chip machine controlling circuit 1 is connected with sound light alarming circuit 2, methane concentration testing circuit 3, oxygen concentration testing circuit 4 respectively.
Described single chip machine controlling circuit 1 comprises single-chip microcomputer U2, crystal oscillator XT1, electric capacity C11, electric capacity C12, electric capacity C13, switch S 1, resistance R24, resistance R26; Wherein the VCC end of single-chip microcomputer U2 and AVCC end and direct supply VCC hold and are electrically connected, the GND end of single-chip microcomputer U2 is connected to ground, crystal oscillator XT1 is connected in parallel on XTAL1 and the XTAL2 two ends of single-chip microcomputer U2, crystal oscillator XT1 two ends are connected to ground respectively by electric capacity C12, electric capacity C13, resistance R24 one end and direct supply VCC hold and are electrically connected, the resistance R24 other end is connected with electric capacity C13 positive pole with switch S 1, switch S 1 other end and electric capacity C13 negative pole are held with the RESET of single-chip microcomputer U2 and are connected with resistance R26 one end, and the R26 other end is connected to ground.
Described methane concentration testing circuit 3 comprises methane transducer MJC1, methane transducer MJC2, resistance R1, resistance R2, resistance R10, resistance R12, resistance R13, resistance R14, resistance R16, resistance R17, resistance R18, potentiometer R11, electric capacity C3, electric capacity C4, operational amplifier A R1, operational amplifier A R2, operational amplifier A R3, wherein operational amplifier A R1, operational amplifier A R2, operational amplifier A R3 power supply positive-negative input end is held with direct supply VCC respectively and ground is connected, methane transducer MJC1, potentiometer R11 holds with direct supply VCC and is connected, the potentiometer R11 other end is connected with resistance R17 one end and operational amplifier A R1 normal phase input end, the methane transducer MJC1 other end is connected with methane transducer MJC2 one end and operational amplifier A R3 normal phase input end, methane transducer MJC2 and resistance R17 is connected to ground, operational amplifier A R1 negative-phase input is connected with operational amplifier A R1 output terminal, operational amplifier A R3 negative-phase input is connected with operational amplifier A R3 output terminal, operational amplifier A R1 output terminal is connected with resistance R12 one end, the resistance R12 other end is connected with resistance R1 one end and operational amplifier A R2 negative-phase input, the resistance R1 other end is connected with resistance R2 and resistance R16, the resistance R2 other end is connected with operational amplifier A R2 output terminal, operational amplifier A R3 output terminal is connected with resistance R14 one end, the resistance R14 other end is connected with resistance R10 one end and operational amplifier A R2 normal phase input end, the resistance R10 other end is connected with the resistance R16 other end and resistance R18 one end respectively, resistance R18 is connected to ground, resistance R13 one end is connected with operational amplifier A R2 output terminal, the resistance R13 other end is connected with the ADC port of electric capacity C3 one end and electric capacity C4 one end and single-chip microcomputer U2, electric capacity C3 and the electric capacity C4 other end are connected to ground.
Embodiment 5: as shown in Figure 1, a kind of gas detection alarm circuit, comprises single chip machine controlling circuit 1, sound light alarming circuit 2, methane concentration testing circuit 3, oxygen concentration testing circuit 4; Wherein single chip machine controlling circuit 1 is connected with sound light alarming circuit 2, methane concentration testing circuit 3, oxygen concentration testing circuit 4 respectively.
Described single chip machine controlling circuit 1 comprises single-chip microcomputer U2, crystal oscillator XT1, electric capacity C11, electric capacity C12, electric capacity C13, switch S 1, resistance R24, resistance R26; Wherein the VCC end of single-chip microcomputer U2 and AVCC end and direct supply VCC hold and are electrically connected, the GND end of single-chip microcomputer U2 is connected to ground, crystal oscillator XT1 is connected in parallel on XTAL1 and the XTAL2 two ends of single-chip microcomputer U2, crystal oscillator XT1 two ends are connected to ground respectively by electric capacity C12, electric capacity C13, resistance R24 one end and direct supply VCC hold and are electrically connected, the resistance R24 other end is connected with electric capacity C13 positive pole with switch S 1, switch S 1 other end and electric capacity C13 negative pole are held with the RESET of single-chip microcomputer U2 and are connected with resistance R26 one end, and the R26 other end is connected to ground.
Described oxygen concentration testing circuit 4 comprises oxygen sensor OS1, resistance R21, resistance R22, resistance R25, potentiometer R23, electric capacity C7, electric capacity C8, electric capacity C9, electric capacity C10, operational amplifier A R4, wherein operational amplifier A R4 power supply positive-negative input end is held with direct supply VCC respectively and is connected with ground, oxygen sensor OS1 two ends are connected with electric capacity C7 two ends respectively, electric capacity C7 one end is connected with resistance R22 one end, the resistance R22 other end is connected with potentiometer R23 one end, the potentiometer R23 other end is connected with resistance R21 one end and operational amplifier A R4 negative-phase input, the resistance R21 other end is connected with operational amplifier A R4 output terminal, electric capacity C9 is connected with operational amplifier A R4 output terminal with electric capacity C8 negative pole respectively with electric capacity C10 one end, electric capacity C9 is connected with the ADC port of ground and single-chip microcomputer U2 with electric capacity C8 positive pole respectively with the electric capacity C10 other end, the electric capacity C7 other end is connected with ground and resistance R25 one end, the resistance R25 other end is connected with operational amplifier A R4 normal phase input end.
Embodiment 6: as shown in Figure 1, a kind of gas detection alarm circuit, comprises single chip machine controlling circuit 1, sound light alarming circuit 2, methane concentration testing circuit 3, oxygen concentration testing circuit 4; Wherein single chip machine controlling circuit 1 is connected with sound light alarming circuit 2, methane concentration testing circuit 3, oxygen concentration testing circuit 4 respectively.
Described single chip machine controlling circuit 1 comprises single-chip microcomputer U2, crystal oscillator XT1, electric capacity C11, electric capacity C12, electric capacity C13, switch S 1, resistance R24, resistance R26; Wherein the VCC end of single-chip microcomputer U2 and AVCC end and direct supply VCC hold and are electrically connected, the GND end of single-chip microcomputer U2 is connected to ground, crystal oscillator XT1 is connected in parallel on XTAL1 and the XTAL2 two ends of single-chip microcomputer U2, crystal oscillator XT1 two ends are connected to ground respectively by electric capacity C12, electric capacity C13, resistance R24 one end and direct supply VCC hold and are electrically connected, the resistance R24 other end is connected with electric capacity C13 positive pole with switch S 1, switch S 1 other end and electric capacity C13 negative pole are held with the RESET of single-chip microcomputer U2 and are connected with resistance R26 one end, and the R26 other end is connected to ground.
Described sound light alarming circuit 2 comprises resistance R3, resistance R4, resistance R5, resistance R6, resistance R7, resistance R8, resistance R9, resistance R15, resistance R19, resistance R20, light emitting diode D1, light emitting diode D2, electric capacity C1, electric capacity C2, electric capacity C5, electric capacity C6, triode Q1, loudspeaker LS1, hummer LS2, voice recording and playback ic U1, wherein resistance R3, resistance R4, electric capacity C1, resistance R5, resistance R6, resistance R7, resistance R8, resistance R9 one end and direct supply VCC hold and are electrically connected, resistance R3 is connected with light emitting diode D1 positive pole, light emitting diode D1 negative pole is connected with the I/O port of single-chip microcomputer U2, resistance R4 is connected with light emitting diode D2 positive pole, light emitting diode D2 negative pole is connected with the light emitting diode interface port of voice recording and playback ic U1, electric capacity C1 and resistance R5 and voice recording and playback ic U1 port of recording is connected, resistance R6 is connected with voice recording and playback ic U1 edging trigger playback port, resistance R7 is connected with voice recording and playback ic U1 level triggers playback port, resistance R8 and resistance R9 are connected with voice recording and playback ic U1 address port respectively, voice recording and playback ic U1 remaining address port and the external timer port of voice recording and playback ic U1 are connected to ground, electric capacity C2 one end is held with direct supply VCC and VCCD and the VCCA port of voice recording and playback ic U1 is connected, the electric capacity C2 other end is connected with VSSD and the VSSA port of voice recording and playback ic U1, loudspeaker LS1 two ends are connected with voice recording and playback ic U1 speaker output port positive and negative terminal respectively, resistance R15 one end is connected with the analog input port of voice recording and playback ic U1, the resistance R15 other end is connected with electric capacity C5 one end, the electric capacity C5 other end is connected with voice recording and playback ic U1 modulating output port, resistance R19 one end, electric capacity C6 positive pole is connected with voice recording and playback ic U1 automatic growth control port, the resistance R19 other end and electric capacity C6 negative pole are connected to ground, hummer LS2 one end is held with direct supply VCC and is connected, the hummer LS2 other end is connected with triode Q1 collector, triode Q1 emitter is connected to ground, triode Q1 base stage is connected with resistance R20 one end, the resistance R20 other end is connected with the I/O port of single-chip microcomputer U2.
Described methane concentration testing circuit 3 comprises methane transducer MJC1, methane transducer MJC2, resistance R1, resistance R2, resistance R10, resistance R12, resistance R13, resistance R14, resistance R16, resistance R17, resistance R18, potentiometer R11, electric capacity C3, electric capacity C4, operational amplifier A R1, operational amplifier A R2, operational amplifier A R3, wherein operational amplifier A R1, operational amplifier A R2, operational amplifier A R3 power supply positive-negative input end is held with direct supply VCC respectively and ground is connected, methane transducer MJC1, potentiometer R11 holds with direct supply VCC and is connected, the potentiometer R11 other end is connected with resistance R17 one end and operational amplifier A R1 normal phase input end, the methane transducer MJC1 other end is connected with methane transducer MJC2 one end and operational amplifier A R3 normal phase input end, methane transducer MJC2 and resistance R17 is connected to ground, operational amplifier A R1 negative-phase input is connected with operational amplifier A R1 output terminal, operational amplifier A R3 negative-phase input is connected with operational amplifier A R3 output terminal, operational amplifier A R1 output terminal is connected with resistance R12 one end, the resistance R12 other end is connected with resistance R1 one end and operational amplifier A R2 negative-phase input, the resistance R1 other end is connected with resistance R2 and resistance R16, the resistance R2 other end is connected with operational amplifier A R2 output terminal, operational amplifier A R3 output terminal is connected with resistance R14 one end, the resistance R14 other end is connected with resistance R10 one end and operational amplifier A R2 normal phase input end, the resistance R10 other end is connected with the resistance R16 other end and resistance R18 one end respectively, resistance R18 is connected to ground, resistance R13 one end is connected with operational amplifier A R2 output terminal, the resistance R13 other end is connected with the ADC port of electric capacity C3 one end and electric capacity C4 one end and single-chip microcomputer U2, electric capacity C3 and the electric capacity C4 other end are connected to ground.
Embodiment 7: as shown in Figure 1, a kind of gas detection alarm circuit, comprises single chip machine controlling circuit 1, sound light alarming circuit 2, methane concentration testing circuit 3, oxygen concentration testing circuit 4; Wherein single chip machine controlling circuit 1 is connected with sound light alarming circuit 2, methane concentration testing circuit 3, oxygen concentration testing circuit 4 respectively.
Described single chip machine controlling circuit 1 comprises single-chip microcomputer U2, crystal oscillator XT1, electric capacity C11, electric capacity C12, electric capacity C13, switch S 1, resistance R24, resistance R26; Wherein the VCC end of single-chip microcomputer U2 and AVCC end and direct supply VCC hold and are electrically connected, the GND end of single-chip microcomputer U2 is connected to ground, crystal oscillator XT1 is connected in parallel on XTAL1 and the XTAL2 two ends of single-chip microcomputer U2, crystal oscillator XT1 two ends are connected to ground respectively by electric capacity C12, electric capacity C13, resistance R24 one end and direct supply VCC hold and are electrically connected, the resistance R24 other end is connected with electric capacity C13 positive pole with switch S 1, switch S 1 other end and electric capacity C13 negative pole are held with the RESET of single-chip microcomputer U2 and are connected with resistance R26 one end, and the R26 other end is connected to ground.
Described sound light alarming circuit 2 comprises resistance R3, resistance R4, resistance R5, resistance R6, resistance R7, resistance R8, resistance R9, resistance R15, resistance R19, resistance R20, light emitting diode D1, light emitting diode D2, electric capacity C1, electric capacity C2, electric capacity C5, electric capacity C6, triode Q1, loudspeaker LS1, hummer LS2, voice recording and playback ic U1, wherein resistance R3, resistance R4, electric capacity C1, resistance R5, resistance R6, resistance R7, resistance R8, resistance R9 one end and direct supply VCC hold and are electrically connected, resistance R3 is connected with light emitting diode D1 positive pole, light emitting diode D1 negative pole is connected with the I/O port of single-chip microcomputer U2, resistance R4 is connected with light emitting diode D2 positive pole, light emitting diode D2 negative pole is connected with the light emitting diode interface port of voice recording and playback ic U1, electric capacity C1 and resistance R5 and voice recording and playback ic U1 port of recording is connected, resistance R6 is connected with voice recording and playback ic U1 edging trigger playback port, resistance R7 is connected with voice recording and playback ic U1 level triggers playback port, resistance R8 and resistance R9 are connected with voice recording and playback ic U1 address port respectively, voice recording and playback ic U1 remaining address port and the external timer port of voice recording and playback ic U1 are connected to ground, electric capacity C2 one end is held with direct supply VCC and VCCD and the VCCA port of voice recording and playback ic U1 is connected, the electric capacity C2 other end is connected with VSSD and the VSSA port of voice recording and playback ic U1, loudspeaker LS1 two ends are connected with voice recording and playback ic U1 speaker output port positive and negative terminal respectively, resistance R15 one end is connected with the analog input port of voice recording and playback ic U1, the resistance R15 other end is connected with electric capacity C5 one end, the electric capacity C5 other end is connected with voice recording and playback ic U1 modulating output port, resistance R19 one end, electric capacity C6 positive pole is connected with voice recording and playback ic U1 automatic growth control port, the resistance R19 other end and electric capacity C6 negative pole are connected to ground, hummer LS2 one end is held with direct supply VCC and is connected, the hummer LS2 other end is connected with triode Q1 collector, triode Q1 emitter is connected to ground, triode Q1 base stage is connected with resistance R20 one end, the resistance R20 other end is connected with the I/O port of single-chip microcomputer U2.
Described oxygen concentration testing circuit 4 comprises oxygen sensor OS1, resistance R21, resistance R22, resistance R25, potentiometer R23, electric capacity C7, electric capacity C8, electric capacity C9, electric capacity C10, operational amplifier A R4, wherein operational amplifier A R4 power supply positive-negative input end is held with direct supply VCC respectively and is connected with ground, oxygen sensor OS1 two ends are connected with electric capacity C7 two ends respectively, electric capacity C7 one end is connected with resistance R22 one end, the resistance R22 other end is connected with potentiometer R23 one end, the potentiometer R23 other end is connected with resistance R21 one end and operational amplifier A R4 negative-phase input, the resistance R21 other end is connected with operational amplifier A R4 output terminal, electric capacity C9 is connected with operational amplifier A R4 output terminal with electric capacity C8 negative pole respectively with electric capacity C10 one end, electric capacity C9 is connected with the ADC port of ground and single-chip microcomputer U2 with electric capacity C8 positive pole respectively with the electric capacity C10 other end, the electric capacity C7 other end is connected with ground and resistance R25 one end, the resistance R25 other end is connected with operational amplifier A R4 normal phase input end.
Embodiment 8: as shown in Figure 1, a kind of gas detection alarm circuit, comprises single chip machine controlling circuit 1, sound light alarming circuit 2, methane concentration testing circuit 3, oxygen concentration testing circuit 4; Wherein single chip machine controlling circuit 1 is connected with sound light alarming circuit 2, methane concentration testing circuit 3, oxygen concentration testing circuit 4 respectively.
Described single chip machine controlling circuit 1 comprises single-chip microcomputer U2, crystal oscillator XT1, electric capacity C11, electric capacity C12, electric capacity C13, switch S 1, resistance R24, resistance R26; Wherein the VCC end of single-chip microcomputer U2 and AVCC end and direct supply VCC hold and are electrically connected, the GND end of single-chip microcomputer U2 is connected to ground, crystal oscillator XT1 is connected in parallel on XTAL1 and the XTAL2 two ends of single-chip microcomputer U2, crystal oscillator XT1 two ends are connected to ground respectively by electric capacity C12, electric capacity C13, resistance R24 one end and direct supply VCC hold and are electrically connected, the resistance R24 other end is connected with electric capacity C13 positive pole with switch S 1, switch S 1 other end and electric capacity C13 negative pole are held with the RESET of single-chip microcomputer U2 and are connected with resistance R26 one end, and the R26 other end is connected to ground.
Described methane concentration testing circuit 3 comprises methane transducer MJC1, methane transducer MJC2, resistance R1, resistance R2, resistance R10, resistance R12, resistance R13, resistance R14, resistance R16, resistance R17, resistance R18, potentiometer R11, electric capacity C3, electric capacity C4, operational amplifier A R1, operational amplifier A R2, operational amplifier A R3, wherein operational amplifier A R1, operational amplifier A R2, operational amplifier A R3 power supply positive-negative input end is held with direct supply VCC respectively and ground is connected, methane transducer MJC1, potentiometer R11 holds with direct supply VCC and is connected, the potentiometer R11 other end is connected with resistance R17 one end and operational amplifier A R1 normal phase input end, the methane transducer MJC1 other end is connected with methane transducer MJC2 one end and operational amplifier A R3 normal phase input end, methane transducer MJC2 and resistance R17 is connected to ground, operational amplifier A R1 negative-phase input is connected with operational amplifier A R1 output terminal, operational amplifier A R3 negative-phase input is connected with operational amplifier A R3 output terminal, operational amplifier A R1 output terminal is connected with resistance R12 one end, the resistance R12 other end is connected with resistance R1 one end and operational amplifier A R2 negative-phase input, the resistance R1 other end is connected with resistance R2 and resistance R16, the resistance R2 other end is connected with operational amplifier A R2 output terminal, operational amplifier A R3 output terminal is connected with resistance R14 one end, the resistance R14 other end is connected with resistance R10 one end and operational amplifier A R2 normal phase input end, the resistance R10 other end is connected with the resistance R16 other end and resistance R18 one end respectively, resistance R18 is connected to ground, resistance R13 one end is connected with operational amplifier A R2 output terminal, the resistance R13 other end is connected with the ADC port of electric capacity C3 one end and electric capacity C4 one end and single-chip microcomputer U2, electric capacity C3 and the electric capacity C4 other end are connected to ground.
Described oxygen concentration testing circuit 4 comprises oxygen sensor OS1, resistance R21, resistance R22, resistance R25, potentiometer R23, electric capacity C7, electric capacity C8, electric capacity C9, electric capacity C10, operational amplifier A R4, wherein operational amplifier A R4 power supply positive-negative input end is held with direct supply VCC respectively and is connected with ground, oxygen sensor OS1 two ends are connected with electric capacity C7 two ends respectively, electric capacity C7 one end is connected with resistance R22 one end, the resistance R22 other end is connected with potentiometer R23 one end, the potentiometer R23 other end is connected with resistance R21 one end and operational amplifier A R4 negative-phase input, the resistance R21 other end is connected with operational amplifier A R4 output terminal, electric capacity C9 is connected with operational amplifier A R4 output terminal with electric capacity C8 negative pole respectively with electric capacity C10 one end, electric capacity C9 is connected with the ADC port of ground and single-chip microcomputer U2 with electric capacity C8 positive pole respectively with the electric capacity C10 other end, the electric capacity C7 other end is connected with ground and resistance R25 one end, the resistance R25 other end is connected with operational amplifier A R4 normal phase input end.
Embodiment 9: as shown in Figure 1, a kind of gas detection alarm circuit, comprises single chip machine controlling circuit 1, sound light alarming circuit 2, methane concentration testing circuit 3, oxygen concentration testing circuit 4; Wherein single chip machine controlling circuit 1 is connected with sound light alarming circuit 2, methane concentration testing circuit 3, oxygen concentration testing circuit 4 respectively.
By reference to the accompanying drawings embodiment of the present utility model is explained in detail above, but the utility model is not limited to above-mentioned embodiment, in the ken that those of ordinary skill in the art possess, various change can also be made under the prerequisite not departing from the utility model aim.
Claims (1)
1. a gas detection alarm circuit, is characterized in that: comprise single chip machine controlling circuit (1), sound light alarming circuit (2), methane concentration testing circuit (3), oxygen concentration testing circuit (4); Wherein single chip machine controlling circuit (1) is connected with sound light alarming circuit (2), methane concentration testing circuit (3), oxygen concentration testing circuit (4) respectively;
Described single chip machine controlling circuit (1) comprises single-chip microcomputer U2, crystal oscillator XT1, electric capacity C11, electric capacity C12, electric capacity C13, switch S 1, resistance R24, resistance R26; Wherein the VCC end of single-chip microcomputer U2 and AVCC end and direct supply VCC hold and are electrically connected, the GND end of single-chip microcomputer U2 is connected to ground, crystal oscillator XT1 is connected in parallel on XTAL1 and the XTAL2 two ends of single-chip microcomputer U2, crystal oscillator XT1 two ends are connected to ground respectively by electric capacity C12, electric capacity C13, resistance R24 one end and direct supply VCC hold and are electrically connected, the resistance R24 other end is connected with electric capacity C13 positive pole with switch S 1, switch S 1 other end and electric capacity C13 negative pole are held with the RESET of single-chip microcomputer U2 and are connected with resistance R26 one end, and the R26 other end is connected to ground;
Described sound light alarming circuit (2) comprises resistance R3, resistance R4, resistance R5, resistance R6, resistance R7, resistance R8, resistance R9, resistance R15, resistance R19, resistance R20, light emitting diode D1, light emitting diode D2, electric capacity C1, electric capacity C2, electric capacity C5, electric capacity C6, triode Q1, loudspeaker LS1, hummer LS2, voice recording and playback ic U1, wherein resistance R3, resistance R4, electric capacity C1, resistance R5, resistance R6, resistance R7, resistance R8, resistance R9 one end and direct supply VCC hold and are electrically connected, resistance R3 is connected with light emitting diode D1 positive pole, light emitting diode D1 negative pole is connected with the I/O port of single-chip microcomputer U2, resistance R4 is connected with light emitting diode D2 positive pole, light emitting diode D2 negative pole is connected with the light emitting diode interface port of voice recording and playback ic U1, electric capacity C1 and resistance R5 and voice recording and playback ic U1 port of recording is connected, resistance R6 is connected with voice recording and playback ic U1 edging trigger playback port, resistance R7 is connected with voice recording and playback ic U1 level triggers playback port, resistance R8 and resistance R9 are connected with voice recording and playback ic U1 address port respectively, voice recording and playback ic U1 remaining address port and the external timer port of voice recording and playback ic U1 are connected to ground, electric capacity C2 one end is held with direct supply VCC and VCCD and the VCCA port of voice recording and playback ic U1 is connected, the electric capacity C2 other end is connected with VSSD and the VSSA port of voice recording and playback ic U1, loudspeaker LS1 two ends are connected with voice recording and playback ic U1 speaker output port positive and negative terminal respectively, resistance R15 one end is connected with the analog input port of voice recording and playback ic U1, the resistance R15 other end is connected with electric capacity C5 one end, the electric capacity C5 other end is connected with voice recording and playback ic U1 modulating output port, resistance R19 one end, electric capacity C6 positive pole is connected with voice recording and playback ic U1 automatic growth control port, the resistance R19 other end and electric capacity C6 negative pole are connected to ground, hummer LS2 one end is held with direct supply VCC and is connected, the hummer LS2 other end is connected with triode Q1 collector, triode Q1 emitter is connected to ground, triode Q1 base stage is connected with resistance R20 one end, the resistance R20 other end is connected with the I/O port of single-chip microcomputer U2,
Described methane concentration testing circuit (3) comprises methane transducer MJC1, methane transducer MJC2, resistance R1, resistance R2, resistance R10, resistance R12, resistance R13, resistance R14, resistance R16, resistance R17, resistance R18, potentiometer R11, electric capacity C3, electric capacity C4, operational amplifier A R1, operational amplifier A R2, operational amplifier A R3, wherein operational amplifier A R1, operational amplifier A R2, operational amplifier A R3 power supply positive-negative input end is held with direct supply VCC respectively and ground is connected, methane transducer MJC1, potentiometer R11 holds with direct supply VCC and is connected, the potentiometer R11 other end is connected with resistance R17 one end and operational amplifier A R1 normal phase input end, the methane transducer MJC1 other end is connected with methane transducer MJC2 one end and operational amplifier A R3 normal phase input end, methane transducer MJC2 and resistance R17 is connected to ground, operational amplifier A R1 negative-phase input is connected with operational amplifier A R1 output terminal, operational amplifier A R3 negative-phase input is connected with operational amplifier A R3 output terminal, operational amplifier A R1 output terminal is connected with resistance R12 one end, the resistance R12 other end is connected with resistance R1 one end and operational amplifier A R2 negative-phase input, the resistance R1 other end is connected with resistance R2 and resistance R16, the resistance R2 other end is connected with operational amplifier A R2 output terminal, operational amplifier A R3 output terminal is connected with resistance R14 one end, the resistance R14 other end is connected with resistance R10 one end and operational amplifier A R2 normal phase input end, the resistance R10 other end is connected with the resistance R16 other end and resistance R18 one end respectively, resistance R18 is connected to ground, resistance R13 one end is connected with operational amplifier A R2 output terminal, the resistance R13 other end is connected with the ADC port of electric capacity C3 one end and electric capacity C4 one end and single-chip microcomputer U2, electric capacity C3 and the electric capacity C4 other end are connected to ground,
Described oxygen concentration testing circuit (4) comprises oxygen sensor OS1, resistance R21, resistance R22, resistance R25, potentiometer R23, electric capacity C7, electric capacity C8, electric capacity C9, electric capacity C10, operational amplifier A R4, wherein operational amplifier A R4 power supply positive-negative input end is held with direct supply VCC respectively and is connected with ground, oxygen sensor OS1 two ends are connected with electric capacity C7 two ends respectively, electric capacity C7 one end is connected with resistance R22 one end, the resistance R22 other end is connected with potentiometer R23 one end, the potentiometer R23 other end is connected with resistance R21 one end and operational amplifier A R4 negative-phase input, the resistance R21 other end is connected with operational amplifier A R4 output terminal, electric capacity C9 is connected with operational amplifier A R4 output terminal with electric capacity C8 negative pole respectively with electric capacity C10 one end, electric capacity C9 is connected with the ADC port of ground and single-chip microcomputer U2 with electric capacity C8 positive pole respectively with the electric capacity C10 other end, the electric capacity C7 other end is connected with ground and resistance R25 one end, the resistance R25 other end is connected with operational amplifier A R4 normal phase input end.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520697943.4U CN205050306U (en) | 2015-09-10 | 2015-09-10 | Gaseous detection alarm circuit |
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| CN201520697943.4U CN205050306U (en) | 2015-09-10 | 2015-09-10 | Gaseous detection alarm circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114324248A (en) * | 2021-12-30 | 2022-04-12 | 福建中电合创电力科技有限公司 | Smoke detector detection circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114324248A (en) * | 2021-12-30 | 2022-04-12 | 福建中电合创电力科技有限公司 | Smoke detector detection circuit |
| CN114324248B (en) * | 2021-12-30 | 2024-02-23 | 福建中电合创电力科技有限公司 | Smoke detector detection circuit |
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Granted publication date: 20160224 Termination date: 20170910 |