CN203606338U - Inspection well gas measurement device with Bluetooth - Google Patents

Abstract

The utility model relates to a detection well gas measuring device with bluetooth, which is composed of a power supply circuit, a detection circuit, a single-chip microcomputer circuit, an alarm indication circuit and a bluetooth circuit. The power supply circuit provides working power to the detection circuit, single-chip circuit, alarm indication circuit, and Bluetooth circuit. The detection circuit converts the combustible gas concentration and oxygen concentration into voltages and outputs them to the single-chip circuit. The single-chip circuit converts the combustible gas concentration and oxygen concentration into digital quantities. It is transmitted through the Bluetooth circuit and received and displayed by other receiving devices; when the single-chip circuit judges that the concentration of combustible gas exceeds the safe concentration value or the oxygen concentration is lower than the safe concentration value, the alarm indicator circuit is driven to send out a corresponding sound and light alarm signal. The device can detect combustible gas concentration and oxygen concentration at the same time, has simple circuit, high reliability and low cost, and can be used for the measurement and alarm of inspection shaft gas.

Description

A gas measuring device for manhole with bluetooth

technical field

The utility model relates to a gas detection and alarm device, in particular to a detection well gas measurement device with bluetooth.

Background technique

The workers who work in the inspection shaft and the rescue workers in the inspection shaft are unfortunately killed. This type of accident occurs from time to time, and the main reason for this phenomenon is that the inspection shaft is not ventilated for a long time, which can easily cause the accumulation of toxic and combustible gases and lack of oxygen. Most of the traditional gas alarms can only detect and alarm the concentration of toxic and combustible gases, or only detect the concentration of oxygen; the equipment that can complete the detection of multiple gases is expensive; Value is inconvenient.

Contents of the invention

The purpose of the utility model is to provide a manhole gas measuring device with bluetooth, which has high reliability and low cost, and can simultaneously detect combustible gas concentration and oxygen concentration.

The technical scheme adopted by the utility model is: a gas measuring device for an inspection shaft with bluetooth, which is composed of a power supply circuit, a detection circuit, a single-chip microcomputer circuit, an alarm indication circuit and a bluetooth circuit. The power supply circuit provides working power to the detection circuit, single-chip circuit, alarm indication circuit, and Bluetooth circuit. The detection circuit converts the combustible gas concentration and oxygen concentration into voltages and outputs them to the single-chip circuit. The single-chip circuit converts the combustible gas concentration and oxygen concentration into digital quantities. It is transmitted through the Bluetooth circuit and received and displayed by other receiving devices; when the single-chip circuit judges that the concentration of combustible gas exceeds the safe concentration value or the oxygen concentration is lower than the safe concentration value, the alarm indicator circuit is driven to send out a corresponding sound and light alarm signal.

The power supply circuit is composed of a battery pack, a dual output DC/DC module and its peripheral components; the power supply circuit outputs a first DC power supply and a second DC power supply; the negative pole of the battery pack is a common ground.

The detection circuit consists of an oxygen sensor, a gas sensor, a first non-inverting amplifier, and a second non-inverting amplifier; the positive terminal of the oxygen sensor is connected to the input terminal of the first non-inverting amplifier, and the negative terminal is connected to the common ground; the heating power supply of the gas sensor is positive connected to the first DC power supply and the common ground respectively, the positive terminal of the sensitive resistor of the gas sensor is connected to the first DC power supply, the negative terminal is connected to one end of the voltage dividing resistor and then connected to the second non-inverting amplifier The other end of the voltage dividing resistor is connected to the common ground.

The single-chip microcomputer circuit is composed of a single-chip microcomputer and a crystal oscillator; the power supply of the single-chip microcomputer is the second DC power supply.

The output terminal of the first non-inverting amplifier is connected to the first analog voltage input terminal of the single-chip microcomputer, and the output terminal of the second non-inverting amplifier is connected to the second analog voltage input terminal of the single-chip microcomputer.

The alarm indicating circuit is composed of a first light-emitting diode, a second light-emitting diode, an active buzzer, a triode, a first current-limiting resistor, a second current-limiting resistor, and a third current-limiting resistor.

After the first light-emitting diode and the first current-limiting resistor are connected in series, they are connected between the first output terminal of the single-chip microcomputer and the common ground; after the second light-emitting diode and the second current-limiting resistor are connected in series, they are connected to the second output terminal of the single-chip microcomputer and the common ground. Between the ground; the emitter of the triode is connected to the common ground, the collector is connected in series with the active buzzer to the first DC power supply, and the base is connected in series with the third current limiting resistor to the third output terminal of the microcontroller.

The bluetooth circuit is composed of a bluetooth module, a button, a third light-emitting diode, a fourth current-limiting resistor, and a pull-down resistor; the power supply of the bluetooth module is a second DC power supply.

After the third light-emitting diode and the fourth current-limiting resistor are connected in series, they are connected between the output terminal of the light-emitting diode of the Bluetooth module and the common ground; They are respectively connected to the key input terminal and the public ground of the Bluetooth module; the asynchronous communication sending end and the receiving end of the Bluetooth module are cross-connected with the asynchronous communication receiving end and the sending end of the single-chip microcomputer.

The oxygen sensor is a KE-50 gas sensor.

The gas sensor is TGS2611 gas sensor.

The model of the dual output DC/DC module is LTC3535.

The bluetooth module model is HC-06.

The model of the single-chip microcomputer is STC12LE5620AD.

The beneficial effect of the utility model is that the combustible gas concentration and oxygen concentration can be detected simultaneously and sent to devices such as mobile phones through bluetooth; when the combustible gas concentration exceeds the safe concentration value or the oxygen concentration is lower than the safe concentration value, a corresponding sound and light alarm can be issued Signal; simple circuit, high reliability and low cost.

Description of drawings

Fig. 1 is a structural block diagram of the utility model.

Fig. 2 is a power circuit diagram of the utility model.

Fig. 3 is a control circuit diagram of the utility model.

Fig. 4 is a schematic diagram of working steps of the utility model.

Detailed ways

The utility model will be further described in detail below in conjunction with the embodiments and accompanying drawings, but the implementation of the utility model is not limited thereto.

The structural block diagram of the utility model shown in Figure 1 is composed of a power supply circuit 100, a detection circuit 200, a single-chip microcomputer circuit 300, an alarm indication circuit 400, and a bluetooth circuit 500. The power supply circuit 100 provides working power to the detection circuit 200, the single-chip microcomputer circuit 300, the alarm indication circuit 400, and the Bluetooth circuit 500. The detection circuit 200 converts the combustible gas concentration and the oxygen concentration into voltages and outputs them to the single-chip computer circuit 300. Concentration and oxygen concentration are converted into digital quantities and transmitted through the Bluetooth circuit 500, received and displayed by other receiving devices; when the single-chip circuit 300 judges that the combustible gas concentration exceeds the safe concentration value or the oxygen concentration is lower than the safe concentration value at the same time, it drives the alarm indication circuit 400 to send out a corresponding signal. sound and light alarm signal.

The power supply circuit 100, as shown in Figure 2, is composed of a battery pack 101, a dual output DC/DC module 102 and its peripheral components; the peripheral components of the dual output DC/DC module 102 include a first capacitor 103, a second capacitor 108, Composed of the third capacitor 111, the first inductor 104, the second inductor 105, the first resistor 106, the second resistor 107, the third resistor 109, and the fourth resistor 110; the voltage of the first DC power supply +V1 output by the power supply circuit 100 is +5V , the output voltage of the second DC power supply +V2 is +3.3V; the battery pack is composed of two 1.5V alkaline batteries, and the negative pole of the battery pack 101 is the common ground GND.

The model of the dual output DC/DC module 102 is LTC3535.

The control circuit of the utility model is shown in Fig. 3 .

The detection circuit 200 is composed of an oxygen sensor 201, a gas sensor 206, a first operational amplifier 202, a second operational amplifier 207, a first potentiometer 205, a second potentiometer 210, a fifth resistor 203, a sixth resistor 204, and a seventh resistor 208. , an eighth resistor 209 and a voltage dividing resistor 211.

Oxygen sensor 201 selects KE-50 gas sensor; gas sensor 206 selects TGS2611 gas sensor.

The first operational amplifier 202, the fifth resistor 203, the sixth resistor 204, and the first potentiometer 205 form the first non-inverting amplifier, and the positive terminal U+ of the oxygen sensor 201 is connected to the input terminal and the negative terminal U- of the first non-inverting amplifier. Connect to common ground GND.

The positive terminal VH+ of the heating power supply of the gas sensor 206 and the negative terminal VH- of the heating power supply are respectively connected to the first DC power supply +V1 and the common ground GND; the positive terminal RS+ of the sensitive resistor of the gas sensor 206 is connected to the first DC power supply +V1; One end of the resistor 211 is connected to the common ground GND, and the other end is connected to the negative terminal RS- of the sensitive resistor to serve as the signal output end of the gas sensor 206; the output signal of the gas sensor 206 is sent to the second operational amplifier 207 and the seventh resistor 208 , the eighth resistor 209, and the input end of the second non-inverting amplifier composed of the second potentiometer 210.

The oxygen concentration voltage is output from the output terminal of the first non-inverting amplifier; the combustible gas concentration voltage is output from the output terminal of the first non-inverting amplifier.

The single-chip microcomputer circuit 300 is composed of a single-chip microcomputer 301 and a crystal oscillator 302; the power supply of the single-chip microcomputer 301 is the second DC power supply + V2.

The model of the single-chip microcomputer 301 is STC12LE5620AD, and the oscillation frequency of the crystal oscillator 302 is 11.0592MHz.

The oxygen concentration voltage is connected to the first analog voltage input end ADC0 of the single-chip microcomputer 301 ; the combustible gas concentration voltage is connected to the second analog voltage input end ADC1 of the single-chip microcomputer 301 .

The alarm indicating circuit 400 is composed of a first light emitting diode 402 , a second light emitting diode 404 , an active buzzer 405 , a triode 406 , a first current limiting resistor 401 , a second current limiting resistor 403 , and a third current limiting resistor 407 . The first light-emitting diode 402 is used to indicate the alarm of hypoxia, and the second light-emitting diode 404 is used to indicate the alarm of excessive combustible gas.

After the first light-emitting diode 402 and the first current-limiting resistor 401 are connected in series, they are connected between the first output terminal P1.5 of the microcontroller 301 and the common ground GND; after the second light-emitting diode 404 and the second current-limiting resistor 403 are connected in series, they are connected to Between the second output terminal P1.6 of the microcontroller 301 and the common ground GND.

The emitter of the triode 406 is connected to the common ground GND, the collector is connected in series with the active buzzer 405 and then connected to the first DC power supply +V1, and the base is connected in series with the third current limiting resistor 407 and then connected to the third output terminal P1 of the single chip microcomputer 301. 7.

The bluetooth circuit 500 is composed of a bluetooth module 501 , a button 504 , a third light emitting diode 503 , a fourth current limiting resistor 502 , and a pull-down resistor 505 .

The power supply of the Bluetooth module 501 is the second DC power supply + V2; after the third light-emitting diode 503 and the fourth current-limiting resistor 502 are connected in series, they are connected between the output terminal LED of the light-emitting diode of the Bluetooth module 501 and the common ground GND; the button 504 is connected in parallel Between the second DC power supply + V2 and the key input terminal KEY of the Bluetooth module 501, the pull-down resistor 505 is connected in parallel between the key input terminal KEY of the Bluetooth module 501 and the public ground GND; the UART transmitting terminal UART-TXD and the receiving terminal of the Bluetooth module 501 The UART-RXD is cross-connected with the UART receiving end RXD and the sending end TXD of the single chip microcomputer 301 .

The model of the Bluetooth module 501 is HC-06.

The working principle of the detection circuit 200 is:

The detection circuit 200 amplifies the output voltage of the oxygen sensor 201 and the output voltage of the gas sensor 206, and sends them to the first analog voltage input terminal ADC0 and the second analog voltage input terminal ADC1 of the single-chip microcomputer 301 respectively; the first potential in the detection circuit 200 The device 205 and the second potentiometer 210 are used to adjust the magnification.

The principle of working steps of single-chip microcomputer 301 is as shown in Figure 4, specifically:

Step 1, power on and initialize;

Step 2, delay for a period of time, wait for the sensor to heat up and enter a stable working state;

Step 3, start the A/D converter for conversion, read the A/D conversion data and perform data processing such as filtering and scale conversion;

Step 4, send the oxygen concentration data and combustible gas concentration data through Bluetooth; receive and display them by other receiving devices such as mobile phones;

Step five, compare the read-in oxygen concentration and combustible gas concentration with the preset set value, and if the set value exceeds the set value, an audible and visual alarm will be issued;

Step 6, go to step 3 after a 1s delay.

Claims (6)

1. the inspection shaft gas measurement device with bluetooth, is made up of power circuit, testing circuit, single chip circuit, warning indicating circuit, Bluetooth circuit, it is characterized in that:

Described power circuit is made up of electric battery, doubleway output DC/DC module and peripheral cell thereof; Power circuit is exported the first direct supply and the second direct supply; The negative pole of electric battery is publicly;

Testing circuit is made up of oxygen sensor, gas security, the first in-phase amplifier, the second in-phase amplifier; Input end, negative terminal that the anode of oxygen sensor is connected to the first in-phase amplifier are connected to publicly; The heating power supply anode of gas security, heating power supply negative terminal are connected to respectively the first direct supply and publicly, the sensitive resistance anode of gas security is connected to the first direct supply, after one client link of the negative terminal of gas security and divider resistance, be connected to the input end of the second in-phase amplifier, other one end of divider resistance is connected to publicly;

Described single chip circuit is made up of single-chip microcomputer, crystal oscillator; The power supply of single-chip microcomputer is the second direct supply;

Described the first in-phase amplifier output terminal is connected to the first analog voltage input of single-chip microcomputer, and the second in-phase amplifier output terminal is connected to the second analog voltage input of single-chip microcomputer;

Described warning indicating circuit is made up of the first light emitting diode, the second light emitting diode, active buzzer, triode, the first current-limiting resistance, the second current-limiting resistance, the 3rd current-limiting resistance;

After the first light emitting diode, the first current-limiting resistance series connection, be connected to the first output terminal of single-chip microcomputer and publicly between; After the second light emitting diode, the second current-limiting resistance series connection, be connected to the second output terminal of single-chip microcomputer and publicly between; Transistor emitter is connected to publicly, be connected to the first direct supply after collector series active hummer, be connected to the 3rd output terminal of single-chip microcomputer after base stage series connection the 3rd current-limiting resistance;

Described Bluetooth circuit is made up of bluetooth module, button, the 3rd light emitting diode, the 4th current-limiting resistance, pull down resistor; The power supply of bluetooth module is the second direct supply;

After the 3rd light emitting diode, the 4th current-limiting resistance series connection, be connected to the light emitting diode output terminal of bluetooth module and publicly between; Button two ends are connected to respectively the key-press input end of the second direct supply and bluetooth module, and pull down resistor two ends are connected to respectively the key-press input end of bluetooth module and publicly; The asynchronous communication receiving end of asynchronous communication transmitting terminal, receiving end and the single-chip microcomputer of bluetooth module, transmitting terminal cross connection.

2. the inspection shaft gas measurement device with bluetooth as claimed in claim 1, is characterized in that: described oxygen sensor is KE-50 gas sensor.

3. the inspection shaft gas measurement device with bluetooth as claimed in claim 1, is characterized in that: described gas security be TGS2611 gas sensor.

4. the inspection shaft gas measurement device with bluetooth as claimed in claim 1, is characterized in that: the model of described doubleway output DC/DC module is LTC3535.

5. the inspection shaft gas measurement device with bluetooth as claimed in claim 1, is characterized in that: described bluetooth module model is HC-06.

6. the inspection shaft gas measurement device with bluetooth as claimed in claim 1, is characterized in that: described single-chip microcomputer model is STC12LE5620AD.

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