CN105608829A

CN105608829A - Fire alarm based on singlechip

Info

Publication number: CN105608829A
Application number: CN201610188952.XA
Authority: CN
Inventors: 刘勇; 荣雪琴
Original assignee: Suzhou Vocational Institute of Industrial Technology
Current assignee: Suzhou Vocational Institute of Industrial Technology
Priority date: 2016-03-30
Filing date: 2016-03-30
Publication date: 2016-05-25

Abstract

The invention discloses a fire alarm based on a singlechip. The fire alarm comprises a mounting seat, a shell, a PCB (Printed Circuit Board), a temperature sensor, a smog sensor, an indicating lamp and a buzzer, wherein the PCB comprises a control circuit which is arranged between the mounting seat and the shell; and the temperature sensor, the smog sensor, the indicating lamp and the buzzer are all distributed on the circumference of the PCB. The fire alarm can be used for measuring the content of indoor smog and detecting the indoor temperature via a through hole in the mounting seat, so as to effectively prevent fire.

Description

SCM Based fire-alarm

Technical field

The present invention relates to a kind of alarm, related in particular to a kind of SCM Based fire-alarm.

Background technology

Fire is the unfortunate event happening occasionally during people live, work, and fire-alarm can make you find early the condition of a fire, and elimination accident ensures personal safety and safety of property. At present, many heat detectors, the fixed temperature detector sold in market, can be used for fire alarm, but its structure is all comparatively complicated, and cost is also higher.

Summary of the invention

The deficiency existing for prior art, object of the present invention is just to provide a kind of SCM Based fire-alarm, by being arranged on the through hole on base, can measure the content of indoor smog, detects indoor temperature, effectively the generation of fire preventing.

To achieve these goals, the technical solution used in the present invention is such: a kind of SCM Based fire-alarm, comprise mount pad, shell, pcb board, temperature sensor, Smoke Sensor, indicator lamp, buzzer, on described pcb board, comprise control circuit and be arranged at mount pad and shell between; Described temperature sensor, Smoke Sensor, indicator lamp, buzzer are distributed on the circumference of pcb board.

As a kind of preferred version, on described mount pad, be provided with through hole, and run through pcb board and shell.

As a kind of preferred version, temperature signal regulation circuit, smoke signal modulate circuit, buzzer alarm circuit, optical alarm circuit, data acquisition circuit that described control circuit comprises single-chip microcomputer and is connected with single-chip microcomputer.

As a kind of preferred version, the model of described single-chip microcomputer is AT89C51, also comprises reset circuit and crystal oscillating circuit.

As a kind of preferred version, the model of described temperature sensor is LM94022.

As a kind of preferred version, the model of described Smoke Sensor is NIS-09C.

As a kind of preferred version, described data acquisition circuit comprises analog-digital chip, d type flip flop, address latch.

Compared with prior art, beneficial effect of the present invention:

1. sound, light dual-alarm function;

2. system failure warning function, in the time that hardware fault appears in system, can send failure alarm signal;

3. abnormal alarm function, when environment occurs when abnormal, sending abnormal alarm signal, comes into the picture, and avoids as far as possible the generation of fire;

4. fire alarm function, once really there is fire, can send acousto-optic alarm of fire immediately.

Brief description of the drawings

Fig. 1 is structural representation of the present invention;

Fig. 2 is top view of the present invention;

Fig. 3 is the theory diagram of control circuit in the present invention;

Fig. 4 is the circuit diagram of control circuit in the present invention;

Fig. 5 is reset circuit and the crystal oscillating circuit of single-chip microcomputer in the present invention;

Fig. 6 is the temperature signal regulation circuit in the present invention;

Fig. 7 is the smoke signal modulate circuit in the present invention;

Fig. 8 is the buzzer alarm circuit in the present invention;

Fig. 9 is the optical alarm circuit in the present invention;

Figure 10 is the data acquisition circuit in the present invention.

Detailed description of the invention

Below in conjunction with specific embodiment, the invention will be further described. Following examples are only for technical scheme of the present invention is more clearly described, and can not limit the scope of the invention with this.

Embodiment:

As shown in Figure 1 and Figure 2, a kind of SCM Based fire-alarm, comprise mount pad 1, shell 2, pcb board 3, temperature sensor 4, Smoke Sensor 5, indicator lamp 6, buzzer 7, on described pcb board 3, comprise control circuit and be arranged at mount pad 1 and shell 2 between; Described temperature sensor 4, Smoke Sensor 5, indicator lamp 6, buzzer 7 are distributed on the circumference of pcb board 3; On described mount pad 1, be provided with through hole 8, and run through pcb board 3 and shell 2.

As shown in Figure 3, Figure 4, described control circuit comprises single-chip microcomputer 30 and is connected with single-chip microcomputer 30 temperature signal regulation circuit 31, smoke signal modulate circuit 32, buzzer alarm circuit 34, optical alarm circuit 35, data acquisition circuit 33; Shown in single-chip microcomputer 30 be core controller, first by temperature sensor 4, Smoke Sensor 5, scene temperature, smog Germany non-electrical signal are converted to the signal of telecommunication, the signal of telecommunication that temperature signal regulation circuit 31, smoke signal modulate circuit 32 are exported temperature sensor 4, Smoke Sensor 5 carries out Collect conversion by data acquisition circuit 33 after nursing one's health, single-chip microcomputer 30 judges whether breaking out of fire of scene, if breaking out of fire, reports to the police by buzzer alarm circuit 34, optical alarm circuit 35.

As shown in Figure 5, the model of described single-chip microcomputer 30 is AT89C51, also comprises reset circuit and crystal oscillating circuit; Described reset circuit provides reset signal in the time powering on, until power supply stable after, cancel reset signal; Described crystal oscillating circuit is worked clock signal is provided for single-chip microcomputer 30.

The model of the preferred described temperature sensor 4 of the present invention is LM94022, because the analog signal that temperature sensor 4 is exported is fainter, and contain interfering signal, so signal need to be amplified and filtering, that temperature sensor 4 uses is high-precision analog output CMOS temperature sensor LM94022, the final stage of this temperature sensor 4 is for recommending output, and the temperature of output voltage and sensing is inversely proportional to, and more high output voltage is lower for temperature; Can provide 4 different gains to allow user select voluntarily, comprising-5.5mV/ DEG C ,-8.2mV/ DEG C ,-10.9mV/ DEG C and-13.6mV/ DEG C, the present embodiment temperature sensor 4 sensitivity selection-5.5mV/ DEG C, so the GS0 of LM94022 and all ground connection of GS1 port, described temperature signal regulation circuit 31 as shown in Figure 6; Because amplifier LM324U2A, the UWC of temperature signal regulation circuit 31 connect dc source, in circuit, there is direct current, so be provided with the capacitor C 1, the C2 that hand over every straight-through in circuit.

The model of the preferred described Smoke Sensor 5 of the present invention is NIS-09C, and Smoke Sensor 5 output voltages are larger, can reach several volts, does not need to amplify smoke signal, only need to be by signal filtering processing, and smoke signal modulate circuit 32 is as shown in Figure 7; Because the amplifier LM324U2B of smoke signal modulate circuit 32 connects dc source, in circuit, there is direct current, so be provided with the capacitor C 7 of handing over every straight-through in circuit.

Be illustrated in figure 8 the buzzer alarm circuit 34 in the present invention, controlled by the P10 pin of single-chip microcomputer 30, in the time that the level of P10 output is high level, triode Q3 conducting, the electric current of buzzer forms loop, the warning of sounding; Otherwise, triode Q3 cut-off, buzzer is not sounded.

Be illustrated in figure 9 the optical alarm circuit 35 in the present invention, wherein the P2 mouth of single-chip microcomputer 30 is controlled, P2.3～the P2.6 of P2 mouth controls respectively 4 light emitting diode D5, D6, D7, D8, giving light reports to the police, the lamp that the P2.3～P2.6 of single-chip microcomputer 30 controls is followed successively by redness (fire signal lamp), red (abnormal signal lamp), yellow (emergency light) and green (normal signal lamp), in the time of the P2.3～P2.6 of single-chip microcomputer 30 output low level, corresponding signal lamp just can luminous alarm.

Be the light data acquisition circuit 33 in the present invention as shown in figure 10, described data acquisition circuit 33 comprises analog-digital chip, d type flip flop, address latch; In the present embodiment, analog-digital chip is ADC0809, and the clock signal of its work is 500KHz, and because its inside does not have clock circuit, clock signal is provided by the ALE port of external microcontroller 30; When the ALE of single-chip microcomputer 30 port is not when access external memory, the ALE end of single-chip microcomputer 30 is with the fixing positive pulse signal of 1/6 output of oscillation frequency clock, therefore crystal oscillator is set 12MKz, pass through frequency-halving circuit, single-chip microcomputer 30 can be to the clock signal of analog-digital chip ADC0809 output 500KHz again; Described d type flip flop is realized signal two divided-frequency, R, the S end ground connection of d type flip flop, and Q is non-for D termination, and Q holds as output, the ALED end of CLK termination single-chip microcomputer 30; Due to a fire-alarm of the present invention collecting temperature, smoke signal, through the temperature of conditioning, IN-0 and the IN-1 port that smoke signal enters respectively analog-digital chip ADC0809, all the other input pin ground connection, 8 digital quantity output pins connect the P0 mouth of single-chip microcomputer 30, the P0 mouth of single-chip microcomputer 30 receives analog-digital chip ADC0809 and transmits 8 bit digital quantity, 8 bit address of exporting to analog-digital chip ADC0809 are through address latch latch, and described address latch is 74LS373.

The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, do not departing under the prerequisite of the technology of the present invention principle; can also make some improvement and distortion, these improvement and distortion also should be considered as protection scope of the present invention.

Claims

1. a SCM Based fire-alarm, is characterized in that: comprise mount pad, shell, pcb board, temperature sensor, Smoke Sensor, indicator lamp, buzzer, on described pcb board, comprise control circuit and be arranged at mount pad and shell between; Described temperature sensor, Smoke Sensor, indicator lamp, buzzer are distributed on the circumference of pcb board.

2. the SCM Based fire-alarm of one according to claim 1, is characterized in that: on described mount pad, be provided with through hole, and run through pcb board and shell.

3. the SCM Based fire-alarm of one according to claim 1, is characterized in that: temperature signal regulation circuit, smoke signal modulate circuit, buzzer alarm circuit, optical alarm circuit, data acquisition circuit that described control circuit comprises single-chip microcomputer and is connected with single-chip microcomputer.

4. the SCM Based fire-alarm of one according to claim 3, is characterized in that: the model of described single-chip microcomputer is AT89C51, also comprises reset circuit and crystal oscillating circuit.

5. the SCM Based fire-alarm of one according to claim 4, is characterized in that: the model of described temperature sensor is LM94022.

6. the SCM Based fire-alarm of one according to claim 5, is characterized in that: the model of described Smoke Sensor is NIS-09C.

7. the SCM Based fire-alarm of one according to claim 6, is characterized in that: described data acquisition circuit comprises analog-digital chip, d type flip flop, address latch.